Dam Maintenance Fact Sheet

Transcription

1 C O L O R A D O P A R K S & W I L D L I F E Dam Maintenance Fact Sheet 5-YR PARKS AND WILDLIFE FUNDING PROPOSAL FOR DAMS Colorado Parks and Wildlife (CPW) owns and operates over 110 dams (100 Wildlife, 10 Parks), the largest inventory of dams for any owner in the State. An inventory of the dams shows that, as classified by the State of Colorado, the CPW dams are classified as follows: 82 dams are jurisdictional (creates a reservoir which impounds more than 100 acre-feet, or a surface area in excess of 20 acres, or dam exceeds 10 feet in height) 17 are high hazard (loss of human life is expected to result from failure of the dam) 17 are significant hazard (significant damage is expected to occur, but no loss of human life is expected) 48 low hazard (no human loss and no significant damage is expected from a dam failure) In mid-2013, CPW developed a Screening Level Risk Analysis (SLRA) tool to provide an overview of our dams risk profile and to assist in prioritizing future actions to manage and reduce risks for the portfolio. The SLRA results clearly indicated that based on the consequences vs. the probability of occurrence that 11 dams were higher risk and very evenly matched. In order to determine the priority of fixing these dams, we developed an analysis tool that considered multiple factors including; Loss of Life, Economic/ Recreation and Environmental Impacts. Based on the results of this analysis, 11 CPW dams are in need of critical repairs to reduce their risk to an acceptable level. Of these 11 dams, two (2) are parks-owned dams and nine (9) are wildlife-owned dams. The total capital necessary to improve these 11 dams, in 2015 dollars is $38,890, Accomplishing this important work will take years. 1. Alberta Park (w) 7. Sylvan Lake (p) 2. Willow Creek (p) 8. Spring Creek (w) 3. Chief Creek #4 (w) 9. Haviland Lake (w) 4. Rito Hondo (w) 10. Black Lake #2 (w) 5. Trujillo Meadows (w) 11. Two Buttes (w) 6. Big Meadows (w) 5 year Funding Proposal Year Parks Capital Wildlife Capital Parks Maintenance Wildlife Maintenance 2016/17 $8,000, $2,000, $800, $600, /18 $2,500, $2,100, $800, $630, /19 $2,500, $2,200, $800, $660, /2020 $0.0 $2,300, $800, $690, /2021 $0.0 $2,400, $800, $720, Total $13,000, $11,000, $4,000, $3,300, The Dam Capital Request will be updated annually for a 5-yr period until we have accomplished our goal of reducing risk at the facilities to a level that meets industry standards. An ongoing maintenance budget will still be required to keep all 110 dams in reasonable condition and to fix minor problems before they require major repairs. For the last 4 years we have experience at least one dam repair emergency per year, which requires a quick response and available funds. COLORADO PARKS & WILDLIFE 6060 Broadway, Denver CO (303) cpw.state.co.us

2 Proposed Capital Dam Funding Fact Sheet Alphabetical List of CPW s Portfolio of Jurisdictional Dams Low Hazard Dams 1 Alberta Park 1 Banner Lake #1 North Michigan Creek 2 Beaver Park 2 Banner Lake #10 Poose Creek 3 Big Beaver Banner Lake #11 R.R. Rutherford 4 Big Meadows Banner Lake #2 Road Canyon #2 5 Black Lake #2 Banner Lake #3 Sand Creek 6 Chief Creek #4 Banner Lake #4 Supply Basin 7 Dowdy Lake Banner Lake #5 Twin Lakes 8 Echo Canyon Banner Lake #8 Upper Dome 9 Flagler Beaver Lake Upper Elk Falls Ranch 10 Garfield Wildlife Pond Bellaire Upper Stillwater 11 Garnet Mesa Cabin Creek Watson Lake 2 12 Haviland Lake Clark White Owl 13 Heart Lake Davis #1 Woods Lake 14 Horseshoe Lake Davis #2 Zimmerman Lake 2 15 La Jara Dam Davis #3 16 Lake Christine Deer Creek #1 17 Lake John Deer Creek #3 18 Lester Creek Deer Creek #4 19 Meadow Creek 1 Duck Slough 20 Miramonte Freeman 21 Parvin Frenchman Creek 22 Rito Hondo Hahns Peak 23 Road Canyon #1 Heart Lake North Dike 24 Skaguay Home Lake 25 Spring Creek Johnnie Johnson 26 Sylvan Lake Jumbo 27 Tarryall Karval 2 28 Troutvale #1 (upper) L.G. Kinney 29 Troutvale #2 (lower) Lake Brennand 30 Trujillo Meadows Lake John Annex 31 Two Buttes 2 Las Animas Fish Hat. 70B 32 Upper Highline Lost Lake 33 Williams Creek Mesa Creek #2 34 Willow Creek Muddy Creek (1) Alberta Park and Meadow Creek Dams are being reclassified to dams (2) Currently under a State Engineer s Office Storage Restriction COLORADO PARKS & WILDLIFE 6060 Broadway, Denver CO (303) cpw.state.co.us

3 STATE OF COLORADO DEPARTMENT OF NATURAL RESOURCES COLORADO PARKS AND WILDLIFE 6060 BROADWAY DENVER, CO Executive Summary Screening Level Risk Analysis Project No Date: February 2, Indiana Street, Suite 500, Golden, CO Phone: Fax:

4 1. 0 E X E C U T I V E S U M M A R Y 1. 1 P R O J E C T O V E R V I E W Colorado Parks and Wildlife (CPW) owns and operates over 110 dams, the largest inventory of dams for any owner in the State (Figure 1-1). An inventory of the dams shows that, as classified by the State of Colorado, the CPW dams are classified as follows (Table 1-1): 82 dams are jurisdictional (creates a reservoir which impounds more than 100 acre-feet, or a surface area in excess of 20 acres, or dam exceeds 10 feet in height) 17 are high hazard (loss of human life is expected to result from failure of the dam) 17 are significant hazard (significant damage is expected to occur, but no loss of human life is expected) 48 are low hazard (no human loss and no significant damage is expected from a dam failure) The average age of this portfolio of dams is approximately 67 years, with construction of most of the dams taking place between 1950 and mid 1970 s. The majority of dams are earthen structures, generally with an impervious core and an up and downstream shell. Two older dams, Skaguay and Beaver Park, are rockfill dams. Tarryall Dam, a thin concrete arch dam, was constructed in the mid s. The dams are exposed to highly-variable climatic conditions, and many structures have limited seasonal access due to their elevation, and normal snow pack. Figure Location of CPW s High and Dams February

5 Table CPW s Portfolio of Jurisdictional Dams (Alphabetically Sorted) Dams Dams Low Hazard Dams 1 Alberta Park 1 Banner Lake #1 Muddy Creek 2 Beaver Park 2 Banner Lake #10 North Michigan Creek 3 Big Beaver Banner Lake #11 Poose Creek 4 Big Meadows Banner Lake #2 R.R. Rutherford 5 Black Lake #2 Banner Lake #3 Road Canyon #2 6 Chief Creek #4 Banner Lake #4 Sand Creek 7 Dowdy Lake Banner Lake #5 Supply Basin 8 Echo Canyon Banner Lake #8 Twin Lakes 9 Flagler Beaver Lake Upper Dome 10 Garfield Wildlife Pond Bellaire Upper Elk Falls Ranch 11 Garnet Mesa Cabin Creek Upper Stillwater 12 Haviland Lake Clark Watson Lake 2 13 Heart Lake Davis #1 White Owl 14 Horseshoe Lake Davis #2 Woods Lake 15 La Jara Dam Davis #3 Zimmerman Lake 2 16 Lake Christine Deer Creek #1 17 Lake John Deer Creek #3 18 Lester Creek Deer Creek #4 19 Meadow Creek 1 Duck Slough 20 Miramonte Freeman 21 Parvin Frenchman Creek 22 Rito Hondo Hahns Peak 23 Road Canyon #1 Heart Lake North Dike 24 Skaguay Home Lake 25 Spring Creek Johnnie Johnson 26 Sylvan Lake Jumbo 27 Tarryall Karval 2 28 Troutvale #1 (upper) L.G. Kinney 29 Troutvale #2 (lower) Lake Brennand 30 Trujillo Meadows Lake John Annex 31 Two Buttes 2 Las Animas Fish Hat. 70B 32 Upper Highline Lost Lake 33 Williams Creek Mesa Creek #2 34 Willow Creek (1) Alberta Park and Meadow Creek Dams are being reclassified to dams (2) Currently under a State Engineer s Office Storage Restriction With this number and varied condition of dams, coupled with limited funds for capital and maintenance of the aging portfolio, CPW required methodology to: 1. Identify dams which may pose the largest risk 2. Develop a capital improvement plan for funding improvements, and 3. Prioritize actions with the acknowledgement that capital and personnel resources are limited. February

6 In order to meet these goals and objectives, the CPW embarked upon a Screening Level Risk Analysis (SLRA) for the high and significant hazard dams S C R E E N I N G L E V E L R I S K A N A L Y S I S CPW determined that a semi-quantitative method was the most appropriate way to efficiently evaluate risks associated with 34 high and significant hazard dams that it owns and operates. The CPW Dam Operations Engineer engaged with the agency responsible for regulating these dams, the Division of Water Resources State Engineer s Office (SEO), to capitalize on the knowledge base within these two Department of Natural Resources agencies. In mid-2013, CPW retained Tetra Tech to design and facilitate the process, and codify the results for the Screening Level Risk Analysis (SLRA). The SLRA generally follows the Best Practices in Dam and Levee Safety Risk Analysis prepared by Reclamation and the U. S. Army Corp of Engineers (USACE). Dams were screened in a workshop setting, attended by SEO Dam Safety Engineers, CPW and Tetra Tech personnel. To facilitate rapid assessment of the risk of each dam, Tetra Tech developed an SLRA tool that enabled capture of information about the dam as well as to facilitate discussion of potential failure modes (PFM). The output of each workshop included a semi-quantitative risk assessment and ranking for each dam P O T E N T I A L F A I L U R E M O D E S & L O S S O F L I F E Dams were generally classified based upon the likelihood of failure (qualitatively ranked from low to very high likelihood - Figure 1-2) and the potential for loss of life (Figure 1-3 Level 1 indicates that the loss of life is unlikely; Level 4 indicates that loss of life could be greater than 100 persons). February

7 Figure Failure likelihood categories and descriptors for semi-quantitative dam safety studies. February

8 Figure Loss of life consequences descriptors mirror for a semi-quantitative assessment. Once the individual failure likelihood/consequence value was determined for each PFM, all PFMs were factored and summed to represent the overall potential for risk by dam. Table 1-2 provides this data. Table PFM Scoring for Loss of Life (N) x Failure Likelihood (f) Dam Name Sum of PFMs from f-n Chart Dam Name Sum of PFMs Considering f-n Chart Alberta Park 142 Flagler 17 Rito Hondo 52 Lester Creek 17 Willow Creek 45 Heart Lake 14 Sylvan Lake 43 Dowdy Lake 13 Big Meadows 42 Tarryall 13 Haviland Lake 41 Lake John 12 Trujillo Meadows 41 Horseshoe Lake 11 Chief Creek #4 40 Miramonte 11 Spring Creek 39 Parvin 11 Black Lake #2 31 Williams Creek 11 Two Buttes 31 Lake Christine 10 Troutvale #2 24 Troutvale #1 10 Road Canyon 23 La Jara #1 8 Garnet Mesa 21 Beaver Park 3 Meadow Creek 21 Skaguay 3 Upper Highline 20 Echo Canyon 2 February

9 1. 4 R E C R E A T I O N / E C O N O M I C & E N V I R O N M E N T A L R I S K F A C T O R S Due to limited resources, CPW required additional factors to assist in prioritizing capital and maintenance projects. In keeping with the CPW Dam Safety Mission to Prevent loss of life and property damage, manage reservoirs to enhance the wildlife resources of the state and provide enjoyable and sustainable outdoor recreational opportunities CPW decided to include the evaluation of environmental and economic/recreational factors that would be affected downstream of each dam should it fail. Table 1-3 explains the qualitative, semi-quantitative and quantative units that were used for input into the decision model. Table Qualitative and Quantative Environmental & Economic Attributes Attributes Placed in Model for Assessment ENVIRONMENTAL BIOLOGICAL DIVERSITY Aquatic: Downstream River Fishery Terrestrial Associated Units (Quantitative, Qualitative or Semi-Qualitative) 1 to 5 ranking (5 is important) 1 to 5 ranking (5 is important) CULTURAL RESOURCES RECREATION/ECONOMIC 1 to 5 ranking (5 is important) COSTS Essential Facilities (from FEMA s HAZUS) # of Facilities with Loss of Use Damage to Structures (from HAZUS) $ / 10,000 Dam Reconstruction Costs $ / 10,000 Road Level of Service Federal Average Annual Daily Traffic (AADT) State AADT County AADT Diversity Fish Replacement Cost $/1,000 REVENUE Fishing Recreation Day Annual Economic Value $/1,000 Water Rights 0 to 5 ranking (5 is important) Park Revenue Annual Park Revenue in $ / 1000 POTENTIAL FAILURE/LOSS OF LIFE Number of people who might potentially suffer loss of life 0 to 150 Summed for Each Dam s PFM (Consequence) X Likelihood 1. 5 L I F E L O S S, R E C R E A T I O N / E C O N O M I C I M P A C T A N D E N V I R O N M E N T A L R I S K S C R E E N I N G Using these quantitative and qualitative data, each criteria category was given a weight by CPW staff based on its importance. Rankings add to 100%, and in the outcomes presented below loss of life was given a weight of 80, Environment was given a weight of 15, and Recreation/Economic Impact was given a weight of 5, summing to a total of 100. Because of the importance of loss of life, it was given a commensurate high weighting. When the model was run with this weighting, the dams are prioritized around the estimated loss of life due to failure (Figure 1-4). February

10 Figure Prioritization of Dam capital improvements based on loss of life weighting at 80%; environment weighted at 15% and recreation/economic impact weighted at 5% in overall importance 1. 6 R E C O M M E N D A T I O N S A N D C O N C L U S I O N S Findings from the potential failure mode analyses include that the average condition of the high hazard dams is fair, with a number of dams having inadequately-sized spillways and, as such, are unable pass the 100-year or greater flood. Generally the significant hazard dams are in similar condition, while the low and non-jurisdictional dams tend to be in relatively worse condition. Additional effort from the CPW s outlet investigation program conducted in 2014 determined that a number of the outlet works were in need of immediate repair. In addition, maintenance work is needed on some of the structures embankments, outlet works, spillways, and other appurtenances. There are some rehabilitation, refurbishment and replacement items that require immediate attention in order to manage the potential for loss of life or significant damage to downstream facilities and the environment. Table 1-4 provides an overview of the condition and risk analysis information of the highest priority dams, as well as a rough order magnitude (ROM) cost for repairing, replacing or refurbishing dam structures and appurtenances. February

11 Table ROM Estimate to Replace, Repair and Refurbish the Highest Priority Structures Dam Potential Failure Mode Analysis (PFMA) Required Capital Improvements (Rough Order of Magnitude -ROM) Estimated Maintenance Work Estimated Repair Costs (ROM) Estimated Capital Costs Alberta Park* Overtopping of Embankment by Flood - (Undersized Spillway) Concentrated leakage out of conduit Enlarge spillway Rehabilitate Outlet Pipe Rehabilitate gate to reduce leakage at gate Spillway Work - $2.75M Rehabilitate outlet conduit -$400K Rehabilitate outlet gate - $400k Set survey monumentation -$20k $3,570,000 Willow Creek (Parks Dam) Concentrated leakage into/ out of conduit Tower Tower is structurally deficient - working with a consultant to identify solution Tower work is currently being evaluated - repair costs presented are approximate $8,000,000 Rito Hondo Overtopping of Embankment by Flood - (Undersized Spillway) Concentrated leakage out of conduit Left Abutment Seepage issues (filter and collections system required) Enlarge spillway Rehabilitate Outlet Pipe Design filter and drainage system for left abutment Rehabilitate gate to reduce leakage at gate Spillway Work - $2.75M Rehabilitate outlet conduit -$400K Rehabilitate outlet gate -$400K Set survey monumentation -$20K Resolve left abutment seepage -$200K $3,770,000 Trujillo Meadows Overtopping of embankment by flood (undersized spillway) Concentrated leakage into conduit Enlarge spillway Rehabilitate outlet pipe Add seepage collection for left abutment Rehabilitate gate to reduce leakage at gate Correct spillway channel to remove water from outlet pipe Spillway Work - $2.75M Rehabilitate outlet conduit -$500K Rehabilitate outlet gate - $400K Set survey monumentation -$20K Spillway channel- $30K $3,870,000 Big Meadows Overtopping of embankment by flood Saddle dam is 3-ft lower than the main dam Enlarge spillway Evaluate saddle dam with inflow design flood Determine if capacity must be increased Spillway Work - $2.75M Improve Saddle Dam - $300K Raise 4-ft and set survey monumentation - $20k $3,070,000 Spring Creek Concentrated leakage into conduit Rehabilitate Conduit Rehabilitate outlet pipe and gate - $500K Set survey monumentation - $20K $520,000 Sylvan Lake (Parks Dam) Overtopping of Embankment by flood - (undersized spillway) Concentrated leakage into conduit Enlarge spillway (Alternative report currently in progress) Rehabilitate conduit (with the current design) Spillway Work - $3.0M Rehabilitate outlet conduit - $400K Rehabilitate Gate - $400K Set survey monumentation -$20K $4,000,000 February

12 Dam Potential Failure Mode Analysis (PFMA) Required Capital Improvements (Rough Order of Magnitude -ROM) Estimated Maintenance Work Estimated Repair Costs (ROM) Estimated Capital Costs Black Lake #2 Overtopping of embankment by flood Enlarge spillway Complete hydrology study Spillway Work - $1.5M Set survey monumentation -$20K $1,700,000 Haviland Lake Overtopping of embankment by Flood Concentrated leakage into conduit Rehabilitate Conduit Perform hydrological analysis Rehabilitate outlet conduit - $400K Set survey monumentation - $20K Upgrade spillway - $1.0M $1,420,000 Chief Creek #4 Overtopping of embankment by Flood Concentrated leakage into conduit Enlarge spillway Rehabilitate outlet works Improve concrete slope paving on upstream side of dam embankment Rehabilitate gate to reduce leakage Spillway Work -$2.0M Rehabilitate outlet gate -$200K Repair upstream slope paving - $30K Set survey monumentation -$20k $2,450,000 Two Buttes ** Overtopping of embankment by flood Dam currently restricted based on Spillway Maintenance work also include rehabilitation of outlet gates Work with the State Dam Safety engineer to reduce the risk for the dam Post Request For Qualifications for gate rehabilitation Determine if work to be performed in the wet or when reservoir is dry again Repair downstream channel from effects of 2013 flood Repair Gates - $500K Spillway work - $6.0M Set survey monumentation - $20K $6,520,000 Subtotal Parks Dams $12,000,000 Subtotal Wildlife Dams $26,890,000 Subtotal Parks and Wildlife Dams (Table 1-4) $38,890,000 * Dam currently being re-classified to high hazard by SEO Repair & Maintenance - other High and (Table 1-5) $3,403,500 ** Currently under a State Engineers Office Storage Restriction Repair & Maintenance - Low and NJ Dams (Table 1-6) $2,383,500 G R A N D T O T A L ESTIMATED REHABILITATION, REFURBISHMENT, REPAIR AND MAINTENANCE FOR ALL CPW DAMS $44,677,000 February

13 Table 1-5 provides a rough order of magnitude estimate of refurbishment, rehabilitation and repair costs for the remaining high and significant hazard dams, as well as a rough order magnitude cost for annual maintenance of dam structures and appurtenances. Dam Tarryall Dowdy Parvin Big Beaver Meadow Creek* Table ROM Estimate to Replace, Repair and Refurbish Remaining High and Structures Estimated Maintenance Work Estimated Cost for Maintenance Work Comments Clean Spillway $10,000 Complete Structural Analysis $275,000 Repair spalling concrete at joints $75,000 Repair upstream to resolve waterstop leakage $750,000 Perform Hydrology Study to determine overtopping of dam $40,000 Create inundation mapping for downstream $10,000 Repair Vent Pipe (may cause dam to drain) $2,500 Repair damage from rodent burrow activity on south dam $10,000 Rehabilitation of outlet pipe (specifically structural hole located at upper end) $300,000 Update Hydrology Study $40,000 Repair and/or remove old valve stem in outlet conduit $2,500 Complete video investigation following the above $6,500 Grade Dam Crest and add roadbase $15,000 Grade left abutment for drainage $7,500 Rehabilitate gates to reduce localized leakage $50,000 Perform outlet video inspection $6,500 Already Funded Construct headwall at outlet pipe $15,000 Update dam Hydrology Study and evaluate spillway $40,000 Upper Highline /Parks Continue monitoring program $100,000 Heart Lake Complete outlet video inspection $6,500 Grade Crest of dam and add roadbase $18,500 Replace seepage weir $20,000 Implement piezometer monitoring program $85,000 Already Funded Identify consultant to investigate seepage and install piezometers along seepage path $75,000 Lake Christine Garfield Wildlife Pond *** Lake John Lester Creek (Pearl Lake) /Parks Horseshoe Dam (Lathrop State Park) /Parks Clear brush and trees from right side of spillway $2,000 DOC Crew Repair grouted riprap along spillway channel $15,500 Clear brush and trees from dam $3,500 DOC Crew Alternative for Dam Embankment $25,000 Perform Video Outlet Inspection $6,500 Already funded Maintain repaired condition for upstream and downstream slopes (specifically regarding animal activity) $15,000 Check spillway elevation in relation to dam crest $20,000 Seal leakage in horizontal opening in principal spillway riser $15,000 Continue with rodent abetment $5,000 February

14 Dam Skaguay Williams Creek Echo Canyon Beaver Park ** Upper Troutvale #1 Lower Troutvale #2 La Jara Garnet Mesa (Sweitzer Lake) /Parks Miramonte Estimated Maintenance Work Estimated Cost for Maintenance Work Comments Structural analysis for existing retaining wall $75,000 Resolve willow growth in spillway channel $4,000 DOC Crew Direct divers to assess condition of upstream steel plate $15,000 Grade Spillway Crest and add roadbase material $15,000 Minor clearing of vegetation (upstream and downstream) $3,000 DOC Crew Diver Only - Check Perform lower gate seepage investigation $7,000 Gate Update Hydrology Report and assess spillway capacity $40,000 Rehabilitate gates to reduce gate leakage $250,000 Grade Crest and add roadbase material $12,500 Clear vegetation in spillway and dam groins $3,000 DOC Crews Currently under Currently under repair repair Clear brush on right toe of dam $3,000 DOC Crew Repair joints in spillway $12,500 Previous inspection yielded sub-optimal Perform outlet video inspection $6,500 results Rehabilitate outlet conduit and wet well $250,000 Keep animal borrows off of dam $5,000 / set Monumentation $20,000 Clear vegetation from downstream dam face $3,000 DOC crew Tree and weed control $5,000 DOC crew Update hydraulic motor for gate $5,000 $20,000 Clean spillway (rock falls) Seal cracks in spillway Update Hydrology Report (undersized spillway) $12,000 $5,000 $20,000 $40,000 TOTAL REHAB/REPAIR FOR 4 REMAINING PARKS DAMS $ 170,000 TOTAL REHAB/REPAIR FOR REMAINING 17 WILDLIFE DAMS $2,969,500 TOTAL REHAB/REPAIR & REFURBISHMENT FOR REMAINING 21 HIGH & SIGNIFICANT HAZARD DAMS $3,139,500 (ENSURES DAMS ARE FUNCTIONING AS INTENDED) Complete inundation mapping for all dams (Assume $8K per dam) $264,000 GRAND TOTAL $3,403,500 * Dam currently being re-classified to high hazard by SEO ** Currently under a State Engineers Office Storage Restriction *** Currently a Dam - should be rated as Low Hazard Table 1-6 provides a rough order of magnitude estimate of refurbishment, rehabilitation and repair costs for the low hazard and non-jurisdictional dams, as well as a rough order magnitude cost for annual maintenance of dam structures and appurtenances. February

15 Table ROM Estimate to Replace, Repair and Refurbish and Maintain Low Hazard and Non-Jurisdictional Dams Dam Name Description of Work Rehabilitation, Replacement, Refurbishment, Maintenance Cost LOW HAZARD DAMS Rehabilitation, Replacement, and Refurbishment Items ZIMMERMAN LAKE** Needs to be re-built $1,500,000 WATSON LAKE** Flood Damage and Inlet needs to be re-built $208,000 NORTH MICHIGAN CREEK Needs some concrete work in the spillway - and other $75,000 (Parks Dam) maintenance work - Dam is in State Forrest State Park KARVAL** Buttress was not constructed correctly - needs to be removed and re-built $500,000 Sub-Total Rehabilitation, Replacement and Refurbishment Items (Low Hazard) $2,283,000 ** Currently under a State Engineers Office Storage Restriction Annual Maintenance Items Low Hazard Dams Annual Maintenance Cost DAVIS #3 (Parks Dam) Estimated Annual Maintenance Low Hazard Dam $ 1,000 DAVIS #2 (Parks Dam) Estimated Annual Maintenance Low Hazard Dam $ 1,000 DAVIS #1 (Parks Dam) Estimated Annual Maintenance Low Hazard Dam $ 1,000 UPPER ELK FALLS RANCH Estimated Annual Maintenance Low Hazard Dam $ 1,000 (Parks Dam) BANNER LAKE #1 Estimated Annual Maintenance Low Hazard Dam $ 1,000 BANNER LAKE #2 Estimated Annual Maintenance Low Hazard Dam $ 1,000 BANNER LAKE #3 Estimated Annual Maintenance Low Hazard Dam $ 1,000 BANNER LAKE #4 Estimated Annual Maintenance Low Hazard Dam $ 1,000 BANNER LAKE #5 Estimated Annual Maintenance Low Hazard Dam $ 1,000 BANNER LAKE #8 Estimated Annual Maintenance Low Hazard Dam $ 1,000 BANNER LAKE #10 Estimated Annual Maintenance Low Hazard Dam $ 1,000 BANNER LAKE #11 Estimated Annual Maintenance Low Hazard Dam $ 1,000 FRENCHMAN CREEK Estimated Annual Maintenance Low Hazard Dam $ 1,000 SAND CREEK Estimated Annual Maintenance Low Hazard Dam $ 1,000 LOST LAKE Estimated Annual Maintenance Low Hazard Dam $ 1,000 BELLAIRE Estimated Annual Maintenance Low Hazard Dam $ 1,000 TWIN LAKES Estimated Annual Maintenance Low Hazard Dam $ 1,000 JOHNNIE JOHNSON Estimated Annual Maintenance Low Hazard Dam $ 1,000 POOSE CREEK Estimated Annual Maintenance Low Hazard Dam $ 1,000 FREEMAN Estimated Annual Maintenance Low Hazard Dam $ 1,000 MESA CREEK #2 Estimated Annual Maintenance Low Hazard Dam $ 1,000 BEAVER LAKE Estimated Annual Maintenance Low Hazard Dam $ 1,000 WHITE OWL Estimated Annual Maintenance Low Hazard Dam $ 1,000 SUPPLY BASIN Estimated Annual Maintenance Low Hazard Dam $ 1,000 HEART LAKE NORTH DIKE Estimated Annual Maintenance Low Hazard Dam $ 1,000 MUDDY CREEK Estimated Annual Maintenance Low Hazard Dam $ 1,000 UPPER STILLWATER Estimated Annual Maintenance Low Hazard Dam $ 1,000 February

16 Dam Name Description of Work Rehabilitation, Replacement, Refurbishment, Maintenance Cost LAKE JOHN ANNEX Estimated Annual Maintenance Low Hazard Dam $ 1,000 HAHNS PEAK Estimated Annual Maintenance Low Hazard Dam $ 1,000 R.R. RUTHERFORD Estimated Annual Maintenance Low Hazard Dam $ 1,000 CABIN CREEK Estimated Annual Maintenance Low Hazard Dam $ 1,000 L.G. KINNEY Estimated Annual Maintenance Low Hazard Dam $ 1,000 DUCK SLOUGH Estimated Annual Maintenance Low Hazard Dam $ 1,000 DEER CREEK #3 Estimated Annual Maintenance Low Hazard Dam $ 1,000 DEER CREEK #4 Estimated Annual Maintenance Low Hazard Dam $ 1,000 DEER CREEK #1 Estimated Annual Maintenance Low Hazard Dam $ 1,000 UPPER DOME Estimated Annual Maintenance Low Hazard Dam $ 1,000 LAKE BRENNAND Estimated Annual Maintenance Low Hazard Dam $ 1,000 HOME LAKE Estimated Annual Maintenance Low Hazard Dam $ 1,000 ROAD CANYON #2 Estimated Annual Maintenance Low Hazard Dam $ 1,000 WOODS LAKE Estimated Annual Maintenance Low Hazard Dam $ 1,000 Sub-Total Estimated Annual Maintenance (Low Hazard Dams) $41,000 NON - JURISDICTIONAL DAMS Rehabilitation, Replacement, and Refurbishment Items BANNER LAKE #7 $50,000 Sub-Total Rehabilitation, Replacement and Refurbishment Items (Non-Jurisdictional) $50,000 Annual Maintenance Items Non Jurisdictional Dams BANNER LAKE #12A Est. Annual Maintenance Non-Jurisdictional Dam $ 500 BANNER LAKE #6 Est. Annual Maintenance Non-Jurisdictional Dam $ 500 BANNER LAKE #9 Est. Annual Maintenance Non-Jurisdictional Dam $ 500 TAMARAC WILDLIFE AREA Est. Annual Maintenance Non-Jurisdictional Dam $ 500 POND B JUMBO Est. Annual Maintenance Non-Jurisdictional Dam $ 500 MACK MESA Est. Annual Maintenance Non-Jurisdictional Dam $ 500 BISON LAKE Est. Annual Maintenance Non-Jurisdictional Dam $ 500 KONANTZ Est. Annual Maintenance Non-Jurisdictional Dam $ 500 LAS ANIMAS FISH HAT. Est. Annual Maintenance Non-Jurisdictional Dam $ A FRANZ #2 Est. Annual Maintenance Non-Jurisdictional Dam $ 500 FRANZ #1 Est. Annual Maintenance Non-Jurisdictional Dam $ 500 CLINGINGSMITH #2 Est. Annual Maintenance Non-Jurisdictional Dam $ 500 HOMESTAKE CREEK Est. Annual Maintenance Non-Jurisdictional Dam $ 500 SMITH Est. Annual Maintenance Non-Jurisdictional Dam $ 500 ROCK CREEK Est. Annual Maintenance Non-Jurisdictional Dam $ 500 MUDDY CREEK Est. Annual Maintenance Non-Jurisdictional Dam $ 500 CLAY CREEK Est. Annual Maintenance Non-Jurisdictional Dam $ 500 FOUNTAIN CREEK #2 Est. Annual Maintenance Non-Jurisdictional Dam $ 500 FOUNTAIN CREEK #3 Est. Annual Maintenance Non-Jurisdictional Dam $ 500 Sub-Total Estimated Annual Maintenance (Non-Jurisdictional Dams) $ 9,500 February

17 Dam Name Description of Work Rehabilitation, Replacement, Refurbishment, Maintenance Cost Total Rehab ilitation, Refurb ish ment and Repair Items (Parks Dams) $ 75,000 Total Rehab ilitation, Refurb ish ment and Repair Items (Wildlife Dams) $2,258,000 TOTAL REHABILITATION, REFURBISHMENT AND REPAIR ITEMS $ 2,333,000 Total Annual Maintenan ce (Parks Dams) $ 4,000 Total Annual Maintenan ce (Wildlife Dams) $ 46,500 TOTAL ANNUAL MAINTENANCE $ 50,500 GRAND TOTAL FOR LOW HAZARD AND NON-JURISDICTIONAL DAMS $ 2,383,000 February