OR99E: Clackamas River Bridge Dunes Drive. Oregon City, OR

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1 Oregon City, OR

2 Technical Information Project Completion Date: March 5, 2015 Project Location: Oregon City, OR Size of Project: 7,015 linear feet of curb; 35,083 square feet of sidewalk and driveways; 210 cubic yards class 330 structural concrete in C.I.P. retaining walls; 200 square feet of seating wall; 2,400 square feet of modified pavement; 80 cubic yards used for light pole and sign foundation; and 125 cubic yards of structural concrete in the bridge sidewalks and rail curb Strength Requirements: 3,300 4,000 psi Water/Cement Ratio: and Unique or High Volume Admixtures: Master Pozzolith 80 MasterSet DELVO Novomesh 950 micro fibers

3 Unique Mix Designs: Novomesh microsynthetic fibers were included in the mix to increase crack resistance in the concrete. Unique Specifications/Requirements: The City of Oregon City has a "no crack" policy for all new concrete sidewalk and driveway construction. Placement Challenges or Unique Techniques: The sidewalk was of varying widths which complicated the forming process. The modified pavement used in the medians and wall caps required hand placement of 36" river rocks in a random pattern on the surface to create a natural finished appearance. This slowed the finishing process and required the use of Delvo to slow the cure to allow time to place the stones. Other Special Technical Aspects: The challenges to this project were the finishes. The concrete had to incorporate the boulders and other natural elements to make them look like the concrete simply flowed around them. The river rock in the modified pavements had to be placed in a random, nonrepeating manner to look natural. The layout was very specific so that the breaks in the walk accommodated the luminaires and other utilities, as well as the trees and other plants.

4 Dunes Drive is the first intersection as you enter Oregon City from the north on McLoughlin Boulevard and serves as the access point to the riverfront parks on the west and the shopping center to the east. Concrete was used extensively on this project to provide the framework for a geometric theme that incorporates steel, glass, stone, concrete, and planted elements to provide much needed improvements for pedestrians and a welcoming entrance to the historic downtown.

5 A large seating wall and courtyard area with a clear view of the river was constructed near a busy bus stop and restaurants in the NW corner of the Dunes Drive intersection.

6 Steel sculptures, large natural boulders, native plants are incorporated into the concrete structure to provide the new entry feature to Oregon City.

7 The concrete courtyard was poured around the boulders to provide an inviting, natural feel.

8 Stairs to provide access to a local restaurant wind through columnar basalt boulders and provide a natural transition from the elevated sidewalk.

9 The 8 steel and glass sculptures on the SW corner of Dunes Drive are constructed on concrete foundations to provide stability in high winds

10 West sidewalks demonstrate the geometric pattern that is repeated in the concrete throughout the project. Modified concrete caps were inset with natural river rocks to provide a natural appearing finish to the retaining walls supporting the sidewalks.

11 The geometric pattern on the east side provides interest to what would otherwise be an uninteresting straight section of sidewalk.

12 The geometric variations on the sidewalk provide natural locations for signs, luminaire poles, and plantings, while still maintaining a direct path for pedestrians.

13 Modified pavement featuring embedded river rocks provides an attractive finish to sections of the raised median divider in areas that were too narrow for plantings.