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.