Minnesota Department of Transportation (MnDOT) Historic Bridge Management Plan Addendum

Transcription

1 Executive Summary Bridge 5370, an open spandrel, two-rib, continuous parabolic concrete arch structure, built in 1937, carries Trunk Highway 60 in Faribault in Rice County. The Minnesota Department of Transportation (MnDOT) has committed to preserve certain state-owned historic bridges, including Bridge As part of this commitment, MnDOT prepared a Historic Bridge Management Plan (Management Plan) for each of the bridges. These plans for state-owned bridges were prepared between 2006 and 2009, and can be found on the MnDOT website (see The 2009 Management Plan for Bridge 5370 describes the character-defining features of the bridge and recommends maintenance, stabilization, and preservation efforts for its ongoing use. MnDOT rehabilitated Bridge 5370 in As part of the review of the project, MnDOT found that the work met the Secretary of the Interior s Standards (Standards) and therefore the bridge retained its significance under both Criterion A: Transportation and Criterion C: Engineering. In 2014 MnDOT retained the services of Mead & Hunt, Inc. to provide an update to the Management Plan to reflect the current condition of the bridge and recommended maintenance activities following the rehabilitation. This addendum to the original Management Plan describes the work completed in 2009, and provides updated photographs and maintenance recommendations. Any future work on the bridge should proceed according to the Management Plan, this addendum, and the Standards.

2 I Introduction Bridge 5370, an open spandrel, two-rib, continuous parabolic concrete arch structure, built in 1937, carries Trunk Highway 60 over the Straight River, a track of the Union Pacific Railroad, and over 3 rd Avenue NE in Faribault in Rice County. In 2002 MnDOT prepared to rehabilitate the bridge; however, the project was delayed until In the interim, ARCH 3 prepared a Minnesota Historic Property Record (MHPR) for Bridge 5370 at the request of MnDOT and the Minnesota State Historic Preservation Office (SHPO). The MHPR provided archival documentation of the history and physical features of the bridge in anticipation of changes to be made during the upcoming rehabilitation efforts. In 2008 MnDOT prepared again for rehabilitation of the bridge. Plans for the rehabilitation were prepared by MnDOT Bridge Engineer Arlen Ottman, and are available at the MnDOT Central Office in St. Paul. MnDOT Cultural Resources Unit (CRU) staff worked in close cooperation with the Federal Highway Administration (FHWA), City of Faribault Historic Preservation Commission (HPC), and SHPO in preparation of plans. A Memorandum of Agreement (MOA) between MnDOT, FHWA, and SHPO, prepared under the original 2002 project and revised in 2007, addressed potential adverse effects to the bridge and nearby historic properties from the proposed rehabilitation. Under the MOA, all rehabilitation work was to conform to the Standards and plans were to be reviewed by SHPO and the Faribault HPC. With the MOA in place, Section 106 requirements were met and MnDOT proceeded with rehabilitation of Bridge 5370 in At the same time, ARCH 3 prepared the Management Plan for Bridge Due to the tandem Management Plan and bridge rehabilitation plan preparation, the bridge description and characterdefining features were written to reflect the bridge s original design, span configuration, features, and historic fabric, some of which had changed as a result of the project. MnDOT retained the services of Mead & Hunt, Inc. in 2014 to provide an update to the Management Plan. Additionally, the characterdefining features are also updated to reflect the changes made to the historic fabric of Bridge Field investigation of the bridge occurred in May Darrell Berry, Structural Engineer, and Katherine Haun, Cultural Resources Specialist, performed the investigation. The following update to the Management Plan includes a review of the 2009 rehabilitation activities, the current condition of the bridge, and recommended character-defining features and future maintenance activities. Cost estimates provided in the original Management Plan were not updated as part of this study. Prior to any planned work, new cost estimates should be prepared for the proposed project. It should also be noted that the 2009 Management Plan identified the Safe, Accountable, Flexible, Efficient Transportation Equity Act: A Legacy for Users (SAFETEA-LU) as a source for rehabilitation funds. Since this time, federal transportation funding was reauthorized under a program known as MAP-21, which replaced SAFETEA- LU. The MAP-21 program is in place until September 30, 2014, at which time it is expected to be replaced by another federal transportation bill expected to authorize federal funds for transportation projects. Introduction I-1

3 II Project Review In 2009 Bridge 5370 underwent rehabilitation. The bridge was reconstructed and widened. The original bridge was approximately 951 feet long and had 17 spans. It had a west abutment, an east abutment, and 17 bents/piers. After work was completed in 2009, the new bridge is approximately 751 feet long and has 11 spans. It has a west abutment, an east abutment, and 10 piers. Bridge span and pier numbering is from west to east. The west approach spans are Spans 1 through 6; the arch spans are Spans 7 through 9; and the east approach spans are Spans 10 and 11. Rehabilitation efforts included the following: Reconstructing and widening the bridge deck from 45 feet to approximately 70 feet; this included widening the roadway from 30 feet to 53 feet clear width to accommodate four lanes of traffic and shoulders. Reconstructing and widening the sidewalks on each side of the bridge from 7 feet, 6 inches wide to 8 feet, 8 inches wide. Removal and replacement of the bridge deck, deck girders, tops of the spandrels in the arch, tops of the concrete piers, lighting, and railing of the main arch spans (spans 7-9). Removal of the western abutment and six concrete approach slab spans, including the bents, from the west side of the bridge. An embankment and a full retaining west abutment were constructed in place of these spans. Removal of the deck and girders of the western approach spans (spans 1-6) and eastern approach spans (spans 10-11). Deck girders were replaced with 27-inch prestressed concrete beams with cast-in-place reinforced concrete deck for Spans 1 thru 6 and Spans Widening and reconstructing Piers 1 thru 5 for the westerly approach spans. Widening and reconstructing Piers 6 thru 9 for the concrete arch spans. Widening and reconstructing Pier 10 for the easterly approach span. Widening and reconstructing the east abutment. Removal of the original staircase that led from the bridge deck to the ground below the bridge, located on the west end of the main spans (between spans 6-7) at Pier 6. Project Review II-2

4 II Project Review Construction of the new concrete bridge deck, new spandrel arch beams with extended cantilevers, and portions of the columns in Spans 7 thru 9. Construction of new concrete railposts on each sidewalk for support of the metal railing and light standards. Installation of new, period-sensitive lighting. Construction of a special TL-2 crash test rated traffic railing on the roadway edge of each sidewalk between the driving surface and the sidewalks. Replacement of the historic ornamental rail on the outside of each sidewalk with new 3-foot, 6- inch-tall ornamental railings and concrete railposts that are sympathetic to the appearance of the original Wisconsin Type railing, along with new period light poles and fixtures. In Span 6, where the bridge crosses the Union Pacific Railroad tracks, the railing has a height of 6 feet, 0 inches. Installation of a curved precast concrete facade on each side of the bridge to cover the new prestressed concrete beams for all approach spans. Installation of random stone riprap at the piers in the river channel banks. Application of MnDOT gray modified cementitious paint/anti-graffiti coating to all new and inplace exposed concrete surfaces, including the abutments, approach span Piers 1-5 and 10, and the base of arch span Piers 6, 7, 8 and 9. Project Review II-3

5 III Current Conditions Overall the bridge is in good condition as depicted in the photographs from the May 2014 field investigation. The May 2013 MnDOT Bridge Inspection Report and 2013 Structure Inventory Report are included in Appendix A. The following structural deficiencies were noted: The strip seal joints located over both abutments and over Piers 3, 6, 8, and 9 are filled with dirt and debris. For the spandrel columns located in the arch spans 7 thru 9, six columns have minor spalled, cracked, or delaminated areas. Minor cracks and minor delaminated areas are located in the piers and pier walls. Minor cracks in the bridge deck and the concrete sidewalks were sealed with an epoxy sealant within the past several years. The south sidewalk has several minor unsealed transverse cracks. The north sidewalk has several minor unsealed transverse cracks and a small delaminated area near Pier 9. Spalled concrete and loss of adhesion of the special surface treatment were observed on the exterior surfaces at the base of the concrete railposts, Type 4 and Type 5 on each side of the bridge. View of the south elevation, facing northwest. Current Conditions III-4

6 III Current Conditions View of the Union Pacific rail line extending under span 6, also showing piers 5 and 6, facing south. Under span 7, view of the riprap at Pier 7 at the Straight River bank, new cantilevered sidewalk framing, facing east-northeast. Current Conditions III-5

7 III Current Conditions Detail of the base of the light poles, a portion of the new spandrel beam, spalling of the special surface finish coating, and extended railing height over the railroad line, facing north. Current Conditions III-6

8 III Current Conditions View of the new rail, replicated light standards and pylon, and new traffic barrier railing, facing south. Current Conditions III-7

9 III Current Conditions View of the replicated light standard, facing south. Current Conditions III-8

10 III Current Conditions View of railing, concrete railpost, and expansion joint in the south sidewalk at east abutment, facing west. Note the epoxy repairs for cracks in the concrete sidewalk. View of the debris-filled expansion joint in the bridge deck at the east abutment, facing north. Current Conditions III-9

11 III Current Conditions View of the highway marker, bridge deck, sidewalk and bridge deck expansion joints, and epoxy repairs in concrete, facing east at west end of the bridge. View of the arch rib, new spandrel columns, spandrel beams, and floorbeams, facing northeast under span 7. Current Conditions III-10

12 III Current Conditions View of pier 6 showing delamination of the special surface coating, facing northeast. Current Conditions III-11

13 III Current Conditions View of pier 10 and east abutment, spans 10 and 11, showing concrete slope paving with rubberizedasphalt membrane, precast concrete facade, and prestressed concrete girders, facing southeast. View of pier 7, spans 7 and 8, showing the arch chord, widened piers, extended cantilevers, and concrete railpost, facing northwest. Current Conditions III-12

14 III Current Conditions View of the new west abutment, northwest wingwall, precast concrete facade, and prestressed girders for span 1, facing west. View of under span 3 looking at new pier 2 and prestressed concrete girders, facing northwest. Current Conditions III-13

15 IV Recommendations As part of the review of the 2009 project and stipulations in the MOA, MnDOT and SHPO found that the work met the Standards (see letter from Jackie Sluss, MnDOT CRU, to Dennis Gimmestad, SHPO, dated 7 November 2008 in Appendix B). The agreement was documented in the 2002, and revised 2007, MOA (See Appendix C for both MOA). As such, the bridge retained its essential physical characteristics to retain significance under Criteria A and C. Mead & Hunt reviewed the character-defining features for Bridge 5370 as outlined in the 2009 Management Plan. As detailed in the Management Plan, the character-defining features for Bridge 5370 were as follows: Feature 1: Design and construction of a reinforced-concrete multiple-arch superstructure Bridge 5370 s series of three monumental, reinforced-concrete, continuous-rib arches have span lengths of approximately 122 feet each and constitute historically significant engineering solutions to the wide Straight River valley crossing. Feature 2: Aesthetic treatment The bridge utilizes Art Deco/Classical Revival style detailing and proportion throughout, most visibly on the faces of the reinforced-concrete piers at the deck/railing level. In addition, a raised concrete band and a stepped design motif in the bridge deck, spandrels, and main piers create shadow lines that emphasize the structure s form and mass. Feature 3: Aesthetic treatment Because of its visually prominent location in the park-like environment of the Straight River valley, ornamental Wisconsin Type metal railings were included in the bridge s design. The Wisconsin Type railing s vertical emphasis complements the bridge s overall proportions and its open design allows bridge pedestrians and motorists a view of the river valley. Feature 4: Aesthetic treatment Bridge 5370 includes ornamental lighting standards in the Classical Revival style. The standards top the bridge piers at intervals that highlight the rhythm of the main arch spans and carry that rhythm out to the approach spans, contributing to the visual unification of the overall bridge design. Due to the modifications made during the 2009 rehabilitation, character-defining feature 3 no longer is applicable. The original Wisconsin Type railing was completely replaced with a new railing. While the new railing is sympathetic to the original Wisconsin Type railing configuration and style, the new railing was not an in-kind replacement. As such, it is recommended that feature 3 be removed. In contrast, the ornamental Classical Revival style light standards were reconstructed to match the original standards. These light standards continue to reflect the aesthetic treatment and overall style of the bridge as defined Recommendations IV-14

16 IV Recommendations in character-defining feature 4. Features 1, 2, and 4 above are recommended to continue to be used as the character-defining features for Bridge The following recommendations are made for maintenance of the bridge. No stabilization recommendations are needed for this bridge due to its recent rehabilitation. 1. Clean dirt and debris from strip seal joints over both abutments and over Piers 3, 6, 8, and Flush the bridge deck, sidewalk, railings, and fascia components with water annually. 3. Seal cracks in the deck and sidewalks on a 5-year cycle using standard MnDOT procedures. 4. Spot paint metal traffic barrier railing, pedestrian railings, and lighting standard components on a 5-year cycle using standard MnDOT procedures. Paint color to match existing. 5. Monitor cracks, spalling, and delamination areas during biannual bridge inspections. 6. Repair spalled concrete and areas with loss of adhesion of the special surface treatment on the exterior surfaces at the base of the concrete railposts Type 4 and Type 5 on each side of the bridge. Recommendations IV-15

17 Local Historic Bridge Report Appendices Appendix A MnDOT Bridge Inspection Report and Structure Inventory Report

18 12/16/2013 Page 1 of 5 Mn/DOT BRIDGE INSPECTION REPORT Inspected by: DISTRICT 6 BRIDGE 5370 TH 60 OVER STRAIGHT R,RR,STREET INSP. DATE: County: City: Township: RICE FARIBAULT Section: 31 Township: 110NN Range: 20W Span Type: CCONC ARCH NBI Deck: 8 Super: 7 Sub: 7 Chan: 7 Culv: N Location: Route: Control Section: 0.3 MI W OF JCT TH 299 MNTH 60 Ref. Pt.: Local Agency Bridge Nbr: 07 Maint. Area: 6B Open, Posted, Closed: OPEN Appraisal Ratings - Approach: 5 Waterway: 8 MN Scour Code: O-STBL;ACT REQD Required Bridge Signs - Load Posting: NOT REQUIRED Traffic: NOT REQUIRED Horizontal: NOT REQUIRED Vertical: NOT APPLICABLE Length: Deck Width: ft 45.0 ft Rdwy. Area / Pct. Unsnd: Paint Area/ Pct. Unsnd: Culvert N/A 28,535 sq ft Def. Stat: ADEQ Suff. Rate: 77.2 STRUCTURE UNIT: 0 ELEM NBR ELEMENT NAME ENV INSP. DATE QUANTITY CS 1 CS 2 CS 3 CS 4 CS LS O/L(CONCDECK-EPX) ,845 SF 52, ,845 SF 52, Notes: There are no spalls, delaminations, or patches noted in the surface of the deck. Bridge was reconstructed and widened in STRIP SEAL JOINT LF N/A N/A LF N/A N/A Notes: The strip seal joints are located over both abutments and over piers 3, 6, 8 & 9. West End Joint - OK, the strip seal joint was full of dirt and debris, with no signs of leakage below onto the bridge seat. Pier 3 Joint - OK, the strip seal joint was full of dirt and debris, with no signs of leakage below onto the bridge seat. Pier 6 Joint - OK, the strip seal joint was full of dirt and debris, with no signs of leakage below onto the bridge seat. The north end of the joint material is not turned up and water leaks down unto the pier causing a ice build up in the winter (pictures were taken). Pier 8 Joint - OK, the strip seal joint was full of dirt and debris, with no signs of leakage below onto the bridge seat. Pier 9 Joint - OK, the strip seal joint was full of dirt and debris, with no signs of leakage below onto the bridge seat. East End Joint - OK, the strip seal joint was full of dirt and debris, with no signs of leakage below onto the bridge seat. 301 POURED DECK JOINT LF N/A N/A LF N/A N/A Notes: Then pourable joints are located over piers 1, 2, 4, 5 & 10, along both approach slabs and the joints along both sidewalks. There are a few scattered areas where the joint material has lost adhesion approximately 16 linear feet. 321 CONC APPROACH SLAB EA N/A EA N/A Notes: West Approach Slab - has 2 full length unsealed longitudinal cracks. South curb has a 6' long snow plow scrape at the face and top edge. East Approach Slab - OK, has 2 full length unsealed longitudinal cracks. 333 RAILING - OTHER ,132 LF 2, N/A N/A ,132 LF 2, N/A N/A Notes: The railing consist of concrete posts with painted steel railing mounted between the concrete posts. The railing are located along both outside edges of the bridge. Bridge was reconstructed and widened in There are several paint scrapes at the roadway face of both rails with no rust staining. 334 METAL RAIL-COATED ,794 LF 1, ,794 LF 1, Notes: The railing is located between the driving surface and the sidewalks along both sides of the bridge. Bridge was reconstructed and widened in No deterioration was noted during the time of this inspection.

19 12/16/2013 Page 2 of 5 Mn/DOT BRIDGE INSPECTION REPORT Inspected by: DISTRICT 6 BRIDGE 5370 TH 60 OVER STRAIGHT R,RR,STREET INSP. DATE: STRUCTURE UNIT: 0 ELEM NBR ELEMENT NAME ENV INSP. DATE QUANTITY CS P/S CONCRETE GIRDER ,645 LF 2, N/A ,645 LF 2, N/A Notes: No deterioration was noted during the time of this inspection. Bridge was reconstructed and widened in CS 2 CS 3 CS 4 CS CONCRETE ARCH LF N/A LF N/A Notes: There are scattered random cracks near the lower ends of the arches and 4 or 5 cold joints cracks scattered along the arches. Bridge was reconstructed and widened in Span # 9 - the north arch has a small rebar spall located along the inside south face near the top and 2 small minor chips on the north face east of the spall. 155 CONCRETE FLOORBEAM ,688 LF 1, N/A ,688 LF 1, N/A Notes: The concrete floorbeams are located in the arch spans 7 thru 9. Bridge was reconstructed and widened in Span # 8 - floorbeam 7 counting from the west end has a small 4" X 12" area of poorly consolidated concrete located along the bottom. 385 CONC SPANDREL COLUMN EA N/A EA N/A Notes: The spandrel columns are located in the arch spans 7 thru 9. Bridge was reconstructed and widened in Span # 7 - South Arch - column 1 counting in from the west end has a small 6" X 12" spalled area located along the northeast corner at the bottom. Column 5 has small 4" X 16" patched area located along the bottom at the northeast corner. North Arch - column 6 counting in from the west end has a small 6" X 12" patched area along the bottom at the northeast corner. Span # 8 - South Arch - column 6 counting in from the west end has a 4" X 48" long area of cracked and delaminated concrete located along the southwest corner and a small 3" X 8" spalled area along the southeast corner near the top. Column 8 has a 4" X 8" spalled area along the south face on the east side. Span # 9 - South Arch - column 2 counting in from the west end has a small 6" X 6" patched area and a small area of poorly consolidated concrete located near the bottom along the west side. Column 5 has a small 4" X 24" cracked and delaminated area located along the southwest corner. Column 6 has 1' X 4' cracked and delaminated area near the bottom along the west side near the south end and 2 small 6" X 8" cracked and delaminated areas located near the top along the northwest and northeast corners. North Arch - column 2 counting in from the west end has a short vertical crack near the top on the west side near the south end. Column 3 has two 3 inch diameter pop-outs along the west side. 380 SECONDARY ELEMENTS EA N/A EA N/A Notes: This elements relates to the concrete fascia facade girders located in spans 1, 2, 3, 4, 5, 6, 10 & 11 and the concrete spandrel arches located between the spandrel columns along the bottom of the deck in spans 7, 8 & 9. There are total of 16 concrete fascia facade girders and 54 concrete spandrel arches. Bridge was reconstructed and widened in Span # 8 - the spandrel arch located between columns 5 & 6 along the south side has a small 4" X 8' cracked and delaminated area next to concrete floorbeam 6.

20 12/16/2013 Page 3 of 5 Mn/DOT BRIDGE INSPECTION REPORT Inspected by: DISTRICT 6 BRIDGE 5370 TH 60 OVER STRAIGHT R,RR,STREET INSP. DATE: STRUCTURE UNIT: 0 ELEM NBR ELEMENT NAME ENV INSP. DATE QUANTITY CS ELASTOMERIC BEARING EA N/A N/A EA N/A N/A Notes: The elastomeric bearings are located along both sides of piers 1, 2, 4, 5 & 10 and along the west sides of piers 3 & 6 and the east abutment. Pier # 1 Bearings - OK, the elastomeric bearings show little or no deterioration. Pier # 2 Bearings - OK, the elastomeric bearings show little or no deterioration. Pier # 3 Bearings - OK, the elastomeric bearings show little or no deterioration. Pier # 4 Bearings - OK, the elastomeric bearings show little or no deterioration. Pier # 5 Bearings - OK, the elastomeric bearings show little or no deterioration. Pier # 6 Bearings - OK, the elastomeric bearings show little or no deterioration. Pier # 10 Bearings - OK, the elastomeric bearings show little or no deterioration. East Abutment Bearings - OK, the elastomeric bearings show little or no deterioration. 313 FIXED BEARING EA N/A N/A EA N/A N/A Notes: The fixed bearings are located along the west abutment and the along the east sides of piers 3 & 9. West Abutment Bearings - OK, the fixed bearings show little or no deterioration. Pier # 3 Bearings - OK, the fixed bearings show little or no deterioration. Pier # 9 Bearings - OK, the fixed bearings show little or no deterioration. 205 CONCRETE COLUMN EA N/A EA N/A Notes: Bridge was reconstructed and widened in Pier # 6 - column 2 has a cracked and delaminated area along the northeast side at the top. Column 1 has a cracked area along the northeast side located approximately 20' up. Pier # 7 - column 2 has a small minor 6" X 12" cracked and delaminated area at the bottom of the southwest corner. Column 1 has a cracked and delaminated along the southeast side located approximately 35' up and a cracked and delaminated area along the southwest side located approximately 30' up. Pier # 8 - column 2 has a 6" X 12" spalled area along the west side at the north end located approximately 20' up and a 4" X 12" spalled area along the west side at the south end located approximately 35' up. Pier # 9 - OK, both columns have 10' long vertical cracks located near the bottoms. CS 2 CS 3 CS 4 CS 5

21 12/16/2013 Page 4 of 5 Mn/DOT BRIDGE INSPECTION REPORT Inspected by: DISTRICT 6 BRIDGE 5370 TH 60 OVER STRAIGHT R,RR,STREET INSP. DATE: STRUCTURE UNIT: 0 ELEM NBR ELEMENT NAME ENV INSP. DATE QUANTITY CS CONCRETE PIER WALL LF N/A LF N/A Notes: Bridge was reconstructed and widened in The pier walls are lower solid concrete portion at all 10 piers. Pier # 1 - has 6 vertical cracks scattered across the surface on both sides and a 1' X 2' patched area along the top edge on the west side near the center line. Pier # 2 - has 7 vertical cracks scattered across the surface on both sides. There are 2 small patched areas located along the east side, a 1' X 1' patched area along the top edge between columns 2 & 3 and a 1' X 2' patched area under column 4. Pier # 3 - has 6 vertical cracks scattered across the surface on both sides and a 1' X 1' patched area along the top edge on the west side just to the north of column 4. Pier # 4 - has 5 vertical cracks scattered across the surface on both sides. The west side has a 1' X 1' patched area along the top edge just to the south of column 5. The east side has a 1' X 1' patched area and a 1' X 1' delaminated area under the patch located at the center line. Pier # 5 - has 3 vertical cracks scattered across the surface on both sides. Pier # 6 - has a 2' X 5' patched area located on the east side along the top edge at the center line. Pier # 7 - has 2 vertical cracks located at the center line and under the north arch. Pier # 8 - has 8 vertical cracks scattered across the surface on both sides. CS 2 Pier # 9 - has 3 vertical cracks scattered across the surface on both sides and a 1' X 1' spalled area located at the northwest corner. Pier # 10 - has 3 vertical cracks scattered across the surface on both sides. 215 CONCRETE ABUTMENT LF N/A LF N/A Notes: Bridge was reconstructed and widened in West Abutment - OK, no deterioration noted at the time of this inspection. East Abutment - Ok, has 1 minor vertical crack located along the south side of girder CONCRETE CAP LF N/A LF N/A Notes: Bridge was reconstructed and widened in Pier # 6 - has a 2 small 1' X 1' areas of poorly consolidated concrete located along the bottom of the cap and a small 1' X 2' cracked and delaminated area located along the bottom and east side at the center line. Pier # 7 - has a 1' X 2' cracked and delaminated area along the bottom and west side at the center line. Pier # 9 - OK, has a 2' X 4' patched area along the bottom and west side at the center line. 387 CONCRETE WINGWALL EA N/A EA N/A Notes: Bridge was reconstructed and widened in The SW wingwall has random leaching cracks. 358 CONC DECK CRACKING EA N/A EA N/A Notes: There are widely scattered unsealed transverse and random cracks along with full length unsealed crack due to the placement of the low slump overlay a total of approximately 1000 linear feet. Cracks were sealed in CONC DECK UNDERSIDE EA EA Notes: There are a few scattered longitudinal or random cracks with some leaching located in spans 7, 8 & 9. There is a 4" diameter spalled area located in span # 8 on the east side of spandrel column # 8 along the south arch. CS 3 CS 4 CS 5

22 12/16/2013 Page 5 of 5 Mn/DOT BRIDGE INSPECTION REPORT Inspected by: DISTRICT 6 BRIDGE 5370 TH 60 OVER STRAIGHT R,RR,STREET INSP. DATE: STRUCTURE UNIT: 0 ELEM NBR ELEMENT NAME ENV INSP. DATE QUANTITY CS SCOUR EA N/A N/A EA N/A N/A Notes: O - Stable for scour. Additional action required. CS 2 CS 3 CS 4 CS CRITICAL FINDING EA 1 0 N/A N/A N/A EA 1 0 N/A N/A N/A Notes: No critical findings were observed at the time of this inspection. 984 DRAINAGE EA N/A N/A EA N/A N/A Notes: All deck drains were open at the time of this inspection. Also drain pipe extension located along piers 1 and 5 were in good condition at the time of this inspection. 985 SLOPES EA N/A N/A EA N/A N/A Notes: The slopes at the abutments and wingwalls are in stable condition at the time of this inspection. 986 CURB & SIDEWALK EA N/A N/A EA N/A N/A Notes: The sidewalks are located along both sides of the bridge, both were in good condition at the time of this inspection. There are plow scrapes on some areas of the curb. South Sidewalk - has approximately 5 linear feet of unsealed transverse cracks. North Sidewalk - has approximately 50 linear feet of unsealed transverse cracks. There is a 2' x4' area of delam near pier MISCELLANEOUS EA N/A N/A EA N/A N/A Notes: yes swallow nests. General Notes: Bridge 5370 The concrete haunch located at the south end of the pier 4 under the sidewalk has a small 4" X 24" area of poorly consolidated concrete. NOTE: All girders, columns and bearings are numbered from the south, all spans and piers are numbered from the west. Spans 7 thru 9 are the concrete arches. NOTE: Bridge was reconstructed and widened in NOTE: The structure has a scour code rating of "O" - SCOUR STABLE, ACTION REQUIRED. NOTE: Bridge was inspected in 2013 by Robert Pyfferoen. Bridge was inspected in 2011 by Gary Waletzki. NOTE: Bridge was inspected using under deck snooper truck in NOTE: Bridge was inspected in 2010 by Eric Evens, Rick Peterson and Brian Haugen. NOTE: After the flooding of September 2010, BR#5370 was inspected for evidence of scour, flood related damage and/or timber debris accumulation. No significant flood related issues were found. Channel - NBI 7 There are areas of minor bank erosion both up and down stream. Inspector's Signature Reviewer's Signature / Date

23 Bridge ID: 5370 Mn/DOT Structure Inventory Report TH 60 over STRAIGHT R,RR,STREET Date: 12/16/2013 Agency Br. No. District County City Township + G E N E R A L + 6 Maint. Area 6B 66 - RICE FARIBAULT Desc. Loc. 0.3 MI W OF JCT TH 299 Sect., Twp., Range Latitude Longitude Custodian Owner Inspection By BMU Agreement Year Built Year Fed Rehab Year Remodeled Temp Plan Avail. Service On Service Under Main Span Type Main Span Detail Appr. Span Type Skew 44d 17m 27.12s 93d 15m 51.99s STATE HWY STATE HWY 1937 Appr. Span Detail Culvert Type Barrel Length DISTRICT CENTRAL NN - 20W + S T R U C T U R E + HWY;PED HWY;RR;STREAM CCONC ARCH OPEN SPANDREL ARCH CONC BM SPAN Number of Spans MAIN: 3 APPR: 8 TOTAL: 11 Main Span Length Structure Length Deck Width Deck Material Wear Surf Type 45.0 ft ft ft C-I-P CONCRETE LOW SLUMP CONC Wear Surf Install Year 1972 Wear Course/Fill Depth Deck Membrane Deck Protect. Deck Install Year Structure Area Roadway Area Sidewalk Width - L/R Curb Height - L/R Rail Codes - L/R NONE 0.20 ft EPOXY COATED REBAR 52,845 sq ft 28,535 sq ft 6.0 ft 6.0 ft 0.67 ft 0.58 ft Bridge Match ID (TIS) Roadway O/U Key Route Sys/Nbr + R O A D W A Y ON Roadway Name or Description Roadway Function Roadway Type TH 60 MAINLINE Control Section (TH Only) 07 Ref. Point (TH Only) Date Opened to Traffic Detour Length Lanes ADT (YEAR) HCADT Vertical Functional Class. 2 WAY TRAF 1 mi. 2 Lanes ON Bridge 10,500 (2004) URB/OTH PR ART If Divided NB-EB SB-WB Roadway Width Vertical Clearance Posted Load Traffic + R D W Y D I M E N S I O N S + Max. Vert. Clear. Horizontal Clear. Lateral Clr. - Lt/Rt Appr. Surface Width Roadway Width Median Width Horizontal MNTH 60 + B R I D G E S I G N S + NOT REQUIRED NOT REQUIRED NOT REQUIRED NOT APPLICABLE 30.0 ft 29.9 ft 51.0 ft 30.0 ft + M I S C. B R I D G E D A T A + Structure Flared Parallel Structure Field Conn. ID Cantilever ID Abut. Pier Historic Status On - Off System Year Painted Painted Area Primer Type Finish Type NO NONE Foundations CONC - SPRD ROCK CONC - SPRD ROCK ELIGIBLE ON + P A I N T + Pct. Unsound + I N S P E C T I O N + Deficient Status Sufficiency Rating ADEQ 77.2 Last Inspection Date Inspection Frequency 24 Inspector Name DISTRICT6 Structure A-OPEN + N B I C O N D I T I O N R A T I N G S + Deck 8 Superstructure 7 Substructure 7 Channel 7 Culvert N + N B I A P P R A I S A L R A T I N G S + Structure Evaluation 7 Deck Geometry 4 Underclearances 9 Waterway Adequacy 8 Approach Alignment 5 + S A F E T Y F E A T U R E S + Bridge Railing 1-MEETS STANDARDS GR Transition 0-SUBSTANDARD Appr. Guardrail 0-SUBSTANDARD GR Termini N-NOT REQUIRED + I N D E P T H I N S P. + Frac. Critical Underwater Pinned Asbly. Spec. Feat. + W A T E R W A Y + Drainage Area Waterway Opening sq ft Navigation Control NO PRMT REQD Pier Protection Nav. Vert./Horz. Clr. Nav. Vert. Lift Bridge Clear. MN Scour Code O-STBL;ACT REQD Scour Evaluation Year + C A P A C I T Y R A T I N G S + Design Load H 15 Operating Rating HS Inventory Rating HS Posting Rating Date Mn/DOT Permit Codes A: 1 B: 1 C: 1 V2006

24 Bridge ID: 5370 Mn/DOT Structure Inventory Report TH 60 over STRAIGHT R,RR,STREET Date: 12/16/2013 Agency Br. No. District County City Township + G E N E R A L + 6 Maint. Area 6B 66 - RICE FARIBAULT Desc. Loc. 0.3 MI W OF JCT TH 299 Sect., Twp., Range Latitude Longitude Custodian Owner Inspection By BMU Agreement Year Built Year Fed Rehab Year Remodeled Temp Plan Avail. Service On Service Under Main Span Type Main Span Detail Appr. Span Type Skew 44d 17m 27.12s 93d 15m 51.99s STATE HWY STATE HWY 1937 Appr. Span Detail Culvert Type Barrel Length DISTRICT CENTRAL NN - 20W + S T R U C T U R E + HWY;PED HWY;RR;STREAM CCONC ARCH OPEN SPANDREL ARCH CONC BM SPAN Number of Spans MAIN: 3 APPR: 8 TOTAL: 11 Main Span Length Structure Length Deck Width Deck Material Wear Surf Type 45.0 ft ft ft C-I-P CONCRETE LOW SLUMP CONC Wear Surf Install Year 1972 Wear Course/Fill Depth Deck Membrane Deck Protect. Deck Install Year Structure Area Roadway Area Sidewalk Width - L/R Curb Height - L/R Rail Codes - L/R NONE 0.20 ft EPOXY COATED REBAR 52,845 sq ft 28,535 sq ft 6.0 ft 6.0 ft 0.67 ft 0.58 ft Bridge Match ID (TIS) Roadway O/U Key Route Sys/Nbr + R O A D W A Y UNDER Roadway Name or Description Roadway Function Roadway Type 3RD AVE Control Section (TH Only) Ref. Point (TH Only) Date Opened to Traffic Detour Length Lanes ADT (YEAR) HCADT Functional Class. 1 mi. MAINLINE 2 WAY TRAF 2 Lanes UNDER Bridge 300 (1975) URBAN LOCAL If Divided NB-EB SB-WB Roadway Width Vertical Clearance Traffic Vertical + R D W Y D I M E N S I O N S + Max. Vert. Clear. Horizontal Clear. Lateral Clr. - Lt/Rt Appr. Surface Width Roadway Width Median Width Posted Load Horizontal MUN B R I D G E S I G N S + NOT REQUIRED NOT REQUIRED NOT REQUIRED NOT APPLICABLE 36.0 ft 18.0 ft 18.0 ft 86.0 ft 36.0 ft 36.0 ft 39.3 ft + M I S C. B R I D G E D A T A + Structure Flared Parallel Structure Field Conn. ID Cantilever ID Abut. Pier Historic Status On - Off System Year Painted Painted Area Primer Type Finish Type NO NONE Foundations CONC - SPRD ROCK CONC - SPRD ROCK ELIGIBLE ON + P A I N T + Pct. Unsound Deficient Status + I N S P E C T I O N + Sufficiency Rating ADEQ 77.2 Last Inspection Date Inspection Frequency 24 Inspector Name Structure DISTRICT6 + N B I C O N D I T I O N R A T I N G S + Deck Superstructure Substructure Channel Culvert + N B I A P P R A I S A L R A T I N G S + Structure Evaluation Deck Geometry Underclearances Waterway Adequacy Approach Alignment + S A F E T Y F E A T U R E S + Bridge Railing GR Transition Appr. Guardrail GR Termini Drainage Area Waterway Opening Navigation Control Pier Protection Nav. Vert./Horz. Clr N MEETS STANDARDS 0-SUBSTANDARD 0-SUBSTANDARD N-NOT REQUIRED + W A T E R W A Y + Nav. Vert. Lift Bridge Clear. MN Scour Code Scour Evaluation Year Design Load Operating Rating Inventory Rating Posting + I N D E P T H I N S P. + Frac. Critical Underwater Pinned Asbly. Spec. Feat. Rating Date A-OPEN H sq ft NO PRMT REQD O-STBL;ACT REQD + C A P A C I T Y R A T I N G S + HS HS Mn/DOT Permit Codes A: 1 B: 1 C: 1 V2006

25 Appendices Appendix B. SHPO and MnDOT Compliance Correspondence

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28 Appendices Appendix C. Memoranda of Agreement

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