Record 1996 floods on Elk Creek caused a number of localized bank erosions. The erosions occurred in areas of past mismanagement of flood prone/riparian zone, and in stretches of past straightening and channel diking. Watershed Consulting was hired to evaluate stream stability and to design and oversee stream channel rehabilitation. A full mouth-to-headwaters Watershed Consulting Level 2.5 stream survey described hydraulic and geomorphic interaction among different stream reaches, and provided plans for short and long-term rehabilitation of channel pattern and hydraulic geometry. Long-term management goals for fish and aquatic habitat improvement were also formulated. Channel rehabilitation was completed in fall 1997 and included complete braided D4 type to single C4 type channel reconstruction, E4 type channel restoration, and use of rootwads for bank stabilization and fish habitat improvement. Appropriate riparian vegetation based on successional communities was planted in flood prone area. After 1998 runoff, numerous scour pools with 2 to 3 feet residual depth have developed along the rootwad revetment, creating quality fish habitat. Two staff gauges were installed and rated for future monitoring. In addition, a pre- and post- fisheries habitat evaluation was completed.
Personnel involved: Igor Suchomel - project management, hydrology, restoration design Steve Buckley - stability assessment, fluvial geomorphology Mike Koopal - fisheries habitat, population sampling
Contact: Mike Miller, Elk Creek Watershed Council, Heron, MT (406) 847-5560