Elk Creek Watershed Council, Umpqua Basin, Oregon


Dodge Canyon Fish Passage Improvement

Undersized culverts can cause increases in water velocities through the culvert that can create erosion at the outlet. In many of these, this erosion scours out the streambed leaving the outlet perched above the channel. Perched culverts are usually a barrier to juvenile coho trying to move upstream in search of cool water, and in extreme cases, they may prevent adults from being able to access high quality spawning and rearing habitat.

The Dodge Canyon project replaced four culverts, two large ones that had become perched, and two smaller ones that were failing. The large culverts were replaced with wide, "fish-friendly" pipes with baffled rock collectors to trap gravel and create a natural bottom. The two smaller culverts were replaced with six-foot, half-round designs.

Funding for the project was provided by OWEB and the Roseburg District BLM Resource Advisory Committee.

1/13  This perched culvert was preventing juvenile coho from moving upstream.
2/13  Don Porior (Porior Engineering) surveyed the site and designed the new culverts.
3/13  This shows the difference between the old culvert that was removed, and the new "fish-friendly" one.
4/13  The bottom where the new culvert need to sit was a muddy mess.
5/13  The bottom was covered with geotextile and built up with rock.
6/13  The sections of culvert were set with the excavator and the bands bolted together.
7/13  The sections have been bolted together and ready for backfill.
8/13  The substrate to create a natural bottom was placed with a small tractor.
9/13  The big culvert after construction.
10/13  After some rain, the stream is starting to adjust.
11/13  This is one of the 6-foot, half-round designs.
12/13  This is the half-round after some rain.
13/13  And after a year.