Cottonwood Creek Culvert

Coffman provided civil and structural engineering design services, as well as land surveying for the restoration of the Cottonwood Creek culvert crossing. The project replaced an existing fish passage barrier where Cottonwood Creek flows under the Grande Ronde River Road, 0.1 miles above the confluence with the Grande Ronde River, restoring access to over 2.5 miles of steelhead habitat. The project was funded in part by the Washington State Department of Fish and Wildlife (WDFW) Fish Barrier Removal Board. The preferred alternative chosen for the crossing structure design was a three sided concrete box culvert which will provide adequate flows for fish passage and was more cost effective than a prefabricated bridge.


  • Civic & Local Government


  • Bridge Engineering
  • Civil Engineering
  • Land Surveying
  • Structural Engineering