Conyers Creek Bridge Replacement - Aquatic Contracting

Clatskanie, OR

Aquatic Contracting LLC, was contracted by the Lower Columbia Watershed Council and the Natural Resource Conservation Service to replace two aging culverts with a large arch bridge, improving fish passage and tidal influence on Conyers Creek.

Under a strict timeline, Aquatic Contracting constructed a large coffer-dam in order to keep the project work area dry. The dam kept tidal fluctuations as high as 9 feet out of the project area. 2000 cubic yards of soil were excavated and the old culverts removed. 2000 tons of stream bed gravel was placed to create a new channel and provide stability and habitat.

For the bridge construction, piling were driven to provide support for the footings. A concrete slab was poured underneath the footing to provide additional stability in the tidal environment. Footings were then poured and the bridge placed. To provide slope stability along the bridge wing walls, log jams were constructed and soil lifts placed on top.

The project was completed in 40 days, inside the allocated window. Shortly after completion the project survived the December 2007 flood. Had the project not been completed, it is likely the culverts would not have sustained the storm and flood damage, and the road would have been washed away.

Had the project not been completed, it is likely the culverts would not have sustained the storm and flood damage, and the road would have been washed away.

MORE RESTORATION PROJECTS

Quilceda Creek Culvert Replacement

VIEW PROJECT

Beaver Creek Restoration: Manchester Fuel Depot

VIEW PROJECT

Fish Passage Bypass: Crooked River Watershed Council

VIEW PROJECT

Yelm Creek Off Channel Habitat Enhancement

VIEW PROJECT

Chehalis Emergency Bank Stabilization

VIEW PROJECT

Conyers Creek Bridge Replacement

VIEW PROJECT

Deep Creek Dam Removal

VIEW PROJECT

Fanno Creek / Greenway Park Enhancement Project

VIEW PROJECT

Calapooia River Fish Habitat Enhancement & Bank Reinforcement

VIEW PROJECT

Whipple Creek Stream Restoration Project

VIEW PROJECT

McKay Creek Fish Passage and Enhancement / Allen Creek Dam Removal

VIEW PROJECT

Milk Creek In-Stream and Riparian Enhancement

VIEW PROJECT

Inspired by nature. Powered by pride.

MORE PROJECTS GET AHOLD OF US