As part of the Spokane River Project License, Avista has developed Erosion Control Programs for the Post Falls Hydroelectric Development's shorelines that lie within and outside the Coeur d’Alene Indian Reservation. The programs and associated activities will help protect and improve water quality, aquatic and riparian habitat over time. The primary elements of these programs include:
- Inventory and Assessment – an erosion analysis of the Post Falls Hydroelectric Development’s shorelines.
- Design and Implement Erosion Control Measures – erosion control designs for designated sites, work with agencies and stakeholders during the design and permitting processes, and install the measures once all permits have been obtained.
- Education and Awareness - increase public awareness of how shoreline homeowners and recreationists can help reduce shoreline erosion.
Avista works with the Coeur d’Alene Tribe, Idaho Department of Environmental Quality, Idaho Department of Fish and Game, and the U.S. Fish and Wildlife Service to identify and prioritize sites in need of shoreline erosion control. Some of our most current work includes the following:
- Water Quality Improvement and Erosion Control Plan, for shorelines outside the Coeur d’Alene Indian Reservation.
We stabilized over one mile of eroding shoreline along the Shadowy St. Joe River. The rock toe protection, coupled with the planting is intended to stop toe erosion and allow the re-establishment of the riparian area. This project is located adjacent to and immediately downstream of the Shadowy St. Joe Forest Service Campground and complements a wetland restoration project on the same property.
- Coeur d’Alene Reservation Lake and Tributary Shoreline Erosion Control Inventory and Assessment, for shorelines within the Coeur d’Alene Indian Reservation.
During 2009 and 2010, Avista and the Coeur d’Alene Tribe completed an erosion inventory and assessment along Coeur d’Alene Lake and the Lower St. Joe River ‘s shoreline within the Tribe's Reservation.
Avista developed a Sediment Management Plan for Nine Mile Reservoir and Lake Spokane. The Plan addresses sediment that is a result of shoreline erosion that primarily occurs in Hangman Creek, a tributary to the Spokane River, located upstream of the Nine Mile Reservoir. Erosion along Hangman Creek is a result of past and current land use practices, including agricultural, road and railroad construction, logging, residential development, etc. The Plan addresses sediment transport and impacts to the river, sediment characterization, monitoring; deposition and transport rates and patterns within the reservoirs, the final disposition of the sediments, and enhancements to fish and wildlife habitat relative to the sediment. (Avista is not planning to dredge or remove sediments from the two reservoirs, unless it interferes with its Project operations or access needs.)
Back to top.
Erosion Work Plans and Reports
As part of the Spokane River Project License, we are implementing erosion control programs in consultation with various regulators, agency partners, and stakeholders.
Work plans and reports associated with each of these programs, along with agencies and stakeholders, include the following:
Post Falls Hydroelectric Development Shorelines off the Coeur d’Alene Indian Reservation
Water Quality Improvement and Erosion Control Plan, 2015 to 2019
Water Quality Improvement and Erosion Control Plan, 2010 to 2014
Agencies and Stakeholders: the Benewah Soil & Water Conservation District, the Idaho Department of Environmental Quality, the Idaho Department of Fish and Game, the Kootenai-Shoshone Soil & Water Conservation District, the Natural Resources Conservation Service, and the U.S. Fish and Wildlife Service.
Post Falls Hydroelectric Development Shorelines within the Coeur d’Alene Indian Reservation
Coeur d'Alene Reservation Erosion Control Implementation Plan, 2014
Coeur d’Alene Reservation Lake and Tributary Shoreline Erosion Control Inventory and Assessment Plan (available upon request due to size)
Agencies and Stakeholders are the Coeur d’Alene Tribe and the U.S. Department of Interior, Bureau of Indian Affairs.
Back to top.
The agency partners that we work with, as we implement the erosion control measures, and their contact information is provided below:
Coeur d’Alene Tribe
Federal Energy Regulatory Commission
Idaho Department of Environmental Quality
Idaho Department of Fish and Game
Natural Resources Conservation Services
United States Department of Interior, Bureau of Indian Affairs
For more information about Avista’s Spokane River erosion activities, please contact:
Aquatic Resource Specialist
1411 E. Mission Ave., MSC-1
Spokane, WA 99220-3727
Office: (509) 495-4643
Back to top.