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Managing Eurasian Watermilfoil in the Lower Clark Fork River

Managing Eurasian Watermilfoil in the Lower Clark Fork River

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Managing Eurasian Watermilfoil in the Lower Clark Fork River

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  1. 3.0 2.9 2.8 2.7 2.6 2.5 2.4 2.3 2.2 2.1 2.0 3.0 2.9 2.8 2.7 2.6 2.5 2.4 2.3 2.2 2.1 2.0 Managing Eurasian Watermilfoil in the Lower Clark Fork River Sanders County June 17, 2007 1B Noxious Danny MacKay Natural Resource Technician Avista Utilities

  2. Project Timeline July 2010: Phase 2 Dye/Herbicide Trials (33.1 ac) July 2012: Pre-treatment monitoring Summer 2008 – Spring 2009: Phase 1 EA Completed. U.S. COE partners with the project. First bottom barrier installation. May 2009: Education Coordinator starts work. 2011 high water year • June 17, 2007: EWM confirmed in Noxon Rapids and Cabinet Gorge Reservoirs August 2012: Herbicide treatment (174 ac) Spring 2010: Phase 2 EA completed July 2009: First Dye/Herbicide Trials (40 ac) Summer of 2008: Mapping EWM infestations in Sanders County • Fall 2007: Formation of the EWM Task Force

  3. Aquatic Invasive Plant Task Force • Avista Utilities • MSU Extension/Sanders County • Noxon Cabinet Shoreline Coalition • Green Mountain Conservation District • Montana Bass Federation • Private industry representative • At-Large Sanders County resident • Confederated Salish & Kootenai Tribes • Sanders County Weed District • Montana Department of Agriculture • MT Fish, Wildlife, & Parks • U.S. Forest Service • PPL Montana

  4. AIP Task Force Goals • Effectively manage Eurasian watermilfoil • Reduce the risk of spread of this plant and other aquatic invasive plants • Implement an aggressive Integrated Weed Management Program on the two reservoirs Post-Treatment Eurasian Watermilfoil with healthy Elodea from the same rake pull.

  5. Working Together • Good Connection • Mixed group of Stakeholders with majority of them being local • Local stakeholders have local interests • Project Support • National expert advisory • Public Process • Education and Outreach • Pre-treatment test trials • Funding

  6. Project Funding $1.2 million - total project cost so far (includes 2013 plans) $250,000 – Avista contribution (Includes efforts with barriers, education, herbicide and check stations.) Funding sources / Partners • Sanders County • Noxious Weed Trust Fund • National Fish and Wildlife Foundation • Montana Department of Agriculture • Idaho Department of Agriculture • Noxon Cabinet Shoreline Coalition • Avista Utilities • MSU Extension • Mississippi State University • U.S. Forest Service • Confederated Salish & Kootenai Tribes • Montana Fish Wildlife and Parks • Green Mountain Conservation District • U.S. Army Corp. of Engineers (Stimulus / reinvestment funds) • Montana Department of Natural Resources and Conservation

  7. Herbicide Test Trials 2009- 40 acres • 2- 20 acre plots were treated. • Dye was mixed with herbicide to track movement. • Treatment plots were compared to control plots. • 2010- 33.1 acres • 3 smaller plots were treated. • Dye was mixed with herbicide to track movements.

  8. Bottom Barrier Program • Constructed of gas-permeable, negatively buoyant fabric and sand filled PVC piping. • Help prevent fragmentation from boats near docks. • Divers place barriers on the reservoir bottom to inhibit weed growth. Ground crew handing off a bottom barrier for the diver to install.

  9. Boat/Trailer Check Stations • Noxon Rapids and Cabinet Gorge Reservoirs form a legally designated "special management area" with three mandatory watercraft check stations. • Montana Dept. of Agriculture Program. • 12 hour per day. • Operate from Memorial Day to Labor Day.

  10. Education Coordinator • Booths: Huckleberry Festival, Sanders County Fair, Mayfly Fling, Sanders County Water Festival • One on One contacts with boaters and fishermen. • Assist AIP Task Force with treatment phase Education coordinator at the Mayfly Fling in Missoula, MT

  11. 2012 Herbicide Treatment • 174 acres of high priority sites were treated in Noxon Rapids Reservoir. • Herbicides: Endothall, Triclopyr and Diquat. • Deep water injections to allow herbicide to penetrate the thick EWM stands. Clean Lakes applying Herbicides in Noxon Rapids Underwater view of dual release herbicide nozzle

  12. Future Plans • 2013 • 2012-52 week after herbicide treatment survey/2013 pre-treatment survey. • Treat ~ 200 acres of EWM in Noxon Rapids Reservoir and possible Cabinet Gorge Reservoir. • 2013- Six week post treatment survey. • 2014-Future • 2013- 52 week after herbicide treatment survey • Treat remainder of Cabinet Gorge Reservoir • Reduce EWM in the management area to a “maintenance scale” (e.g. diver pulling, low scale herbicide treatments, bottom barrier control)

  13. Contact Information Danny MacKay Natural Resource Technician Email: daniel.mackay@avistacorp.com Phone: (406)-847-1297