In 2000, Watershed Consulting was contracted to provide a site assessment and erosion control and bank stabilization design for a demonstration project. The use of stream bank protection and stabilization techniques along the Flathead River has been debated for decades. A principle cause for debate is the fact that each point of instability presents an individual and unique problem caused by an array of interrelated factors. River size and character, topography, aspect, land use, soil characteristics, vegetation communities, and a fluctuating water level all contribute to the stability or instability of a specific bank. In the past, techniques used to reduce erosion and mass wasting were limited mostly to artificially armoring the bank with riprap. Now, the focus of bank stabilization has shifted towards the restoration of elements and processes that naturally stabilize stream banks while providing other important functions as well. The purpose of the Flathead River Bank Stabilization Demonstration Project is to contrast and compare a diversity of riverbank stabilization techniques in light of the following goals:
Bank Stability
Fish and Wildlife Habitat
Aesthetics
Practicality & Economic Efficiency
In addition to the overall goals listed above, the demonstrated techniques should attempt to meet the following objectives:
Techniques should be self maintaining, requiring little attention after the initial installment;
Techniques should emphasize the use of native plants and soil bioengineering;
Techniques should emphasize the restoration of the physical and biological functions of riverside ecosystem;
Techniques should improve water quality through reduction of water temperature and sediment contributions; and
Techniques should connect fragmented riparian habitats
Several of these techniques have been used successfully on streams and rivers in the Flathead Valley. However, the demonstration project is designed to implement many of these techniques in the same area and monitor the effectiveness of each technique over the long term, with Total Station Survey accuracy and photo points. In this way various land management and permitting agencies, as well as the public, can evaluate the effectiveness of the various techniques in terms of the above goals.
Personnel Involved: Steve Buckley, Project Manager Mark Vander Meer - Restoration Ecologist/ Soil Scientist
Contact: Kathy Jones, Flathead Conservation District (406) 752-4220