1. CLARK FORK RIVER DEMONSTRATION PROJECTS
In-Situ Stabilization
Streambank Stabilization Projects
Pre-Construction, December 1999
Post-Construction, April 2000
Bankform Roughness Project
Governor’s Project, 1989
Governor’s Project, 1998
Governor’s Project
Re-slope eroding banks and plant willow cuttings
: Erosion rate lower on treated banks
UCFR Streambank Stabilization Pilot Study
Funded by ARCO, Implemented by UM RWRP ( )
9,450 feet of bank within 13 study reaches, 8 control areas
29 different “soft” treatments
Rooted stock: 96% success rate, Cut stock: 22% success rate
South Deer Lodge Entryway Improvement Project
Three subareas, Subarea 2 part of RWRP work
Area developed as park
Bankform Roughness (Johns’) Project
Designed by AERL in conjunction with USGS
Design Theory: Reduce shear stress by increasing the
form roughness of the bank
Increase roughness by modifying bank geometry
(scallops) and by transplanting numerous large
willows and willow cuttings
Post-Construction survey complete
At least two monitoring surveys planned prior to
completing CRFOU Feasibility Study
Governor’s Project
South Deer Lodge Entryway Improvement Project
Upland Till Demonstration Project
RIT Project
Monitoring Highlights
Amended tailings have remained near neutral pH (Governor’s
and SDLEIP).
Low to slightly saline EC values. Saline soil in low-lying areas
with high groundwater (SDLEIP).
Nutrient values comparable to native ecosystems (Governor’s) to
slightly high (SDLEIP).
Total vegetative cover and production significantly higher on
treated areas as compared to control areas (Governor’s).
Groundwater
Governor’s: pH values near neutral. Majority of dissolved
metals below detection. Cu lower in treated areas. As above
MCL in one (of four) treated area wells.
SDLEIP: All wells comparable throughout site. As below
MCL’s in all site wells. Data indicate regional rather than
local effect.