Projects > Rock Creek Relocation and Habitat Improvement Project


Confluence worked with Montana Fish, Wildlife & Parks on a feasibility study, survey, design and construction of a restoration plan to re-establish fish passage between Rock Creek and the Big Hole River near Wisdom, Montana. Rock Creek was historically one of the most important Big Hole River tributaries for grayling spawning and rearing. Fish passage had been previously eliminated by the construction of a large irrigation ditch that intercepted the entire flow of Rock Creek.

This restoration project included relocating 4,850 feet of Rock Creek to reconnect the stream to the Big Hole River, stabilizing 1,350 feet of eroding stream banks, and restoring pool habitat in an additional 10,000 of channel. Confluence also designed and installed a pin and plank irrigation diversion structure with a denil fish ladder. The fish ladder may be adjusted up or down depending on water elevations. Confluence provided construction oversight for the channel restoration and diversion structure in the fall of 2006 and spring of 2007. The first Arctic grayling was found in Rock Creek shortly after completion of the project.