The Chewuch River Mile 10 Fish Habitat Enhancement Project (RM10), improves stream complexity by improving available instream habitat, increasing side channel and off channel habitat, and stabalizing eroding banks. The RM10 project encompasses 0.85 miles of river length and provides benefits to spring chinook, Upper Columbia steelhead and bull trout, as well as providing habitat for resident fish species.
The Chewuch River supports numerous salmonids, some of which are listed under the Endagered Species Act (ESA), including spring chinook, Upper Columbia steelhead and bull trout. The Yakama Nation, working collaboratively with the landowner, designed this project to increase survival rates for young of the year (YOY) spring chinook, Upper Columbia steelhead and bull trout by:
- construct eight engineered log structures (ELS),
- construct 1300 feet of backwater channel habitat,
- replace an undersize culvert,
- and replant all disturbed areas.
The ELS's were constructed on private land, working collaboratively with the landowner,along 0.85 miles of Chewuch River shoreline. The location of each ELS was strategically positioned to provide the most benefit for emerging, rearing and staging fish. A total of 173 Douglas Fir trees were used for the construction of the ELS's, with each structure ballasted by large boulders to ensure no movement during high water events.
The backwater channel is 1,300 feet long and located in an historic remanant side channel. The backwater channel starts at the outlet of an existing ground water produced pond, on the private property, and connects to the Chewuch River on the downstream end of the property. Deepening the remnant channel and installing a properly sized culvert ensures access for both anadromous and resident fish year round. Pools and cover habitat were created within the channel using 47 pieces of large woody material.
All disturbed areas were replanted with native stock that had been collected a year prior to construction.
|Activity Type - Floodplain Restoration - Washington|
|Channel Connectivity/Rehabilitation/Creation - Floodplain Restoration||1,227 Linear Feet|
|Activity-Fish Passage Improvement|
|Number of Blockages/Impediments/Barriers Removed/Altered||01 Number||10/31/2011|
|Activity-High Level Habitat|
|Miles Of Stream Made Accessible||00.25 Miles||10/31/2011|
|Total Miles Of Instream Habitat Treated||00.5 Miles|
|Activity-Instream Habitat Project|
|Acres Of Channel/Off-Channel Connected Or Added||01.5 Acres|
|Instream Pools Created/Added||05 Number|
|Miles of Off-Channel Stream Created||00.25 Miles|
|Miles of Stream Treated for channel reconfiguration and connectivity||00.25 Miles|
|Number of structures placed in channel||06 Number|