Delph Creek

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Project Owner: Clackamas County
Contract type: Design, Bid, Build
Project Description: Remove and replace two 54” diameter culverts with a precast, modular bridge.
Project Features: Bridge is 38’ long with a 33’ clear span and 25’ width.

Special Features:
Wing walls were designed and built with varying lengths and features. Three wing walls were built using a “stair-step” up method for road fill containment. The fourth wing wall was also designed for road fill containment while also protecting the road against scour from a side channel. There were utility conduits cast into the curb panels to accommodate existing and future utilities. Guardrail inserts were cast into the curb panels to accept guardrail post. Guardrail was designed and built using crash test level 2 criteria.

Challenges and Solutions
During excavation, unexpected bedrock was encountered at a depth that was 5.5’ above the designed bottom footing elevation. Using our modular system, we were able to eliminate three layers of modular abutment blocks and found the system on the bedrock. With vertical holes cast into our modular blocks, we doweled and grouted the abutments directly to the bedrock. Using this system, the county saved the expense of having to cast new product to match the bedrock and still maintain the project schedule.