DESCRIPTION
The Pomeroy CD will use this grant to improve instream wood and pool habitat for wild steelhead in the Alpowa Creek watershed in a restoration reach. Approximately 200 PALs (with at least 3 key pieces of wood) will be installed in a 2 mile reach located in prime spawning and rearing habitat that was identified with SRFB Project #11-1576 – Alpowa Habitat Assessment and also expands restoration efforts of SRFB Project #13-1399 – Alpowa Instream Post Assisted Log Structures that previously installed 202 PALs upstream in 2014/15 field seasons. We are looking at increasing pool habitat and large wood by hand placing material at an additional 200 locations within the stream channel and using 3 inch wooded posts to hold the structures in place for juvenile and adult steelhead habitat. These structures have also been installed in the North and South forks and Charley Creek in Asotin Creek watershed, the Little Tucannon within Tucannon watershed and Alpowa Creek watershed. They are a very cost effective way to install instream structure without damaging the existing riparian habitat and leaving a small footprint that is very cost effective resulting in project funding being available for other project sponsors. SRFB Project #11-1576P identified a need for more wood and pool habitat within the Alpowa creek watershed and this project is a result of not only that project assessment but also SRFB Project #13-1399 that resulted in 202 structures. There is no fishing allowed within this wat
The Alpowa Instream Post Assisted Log Structures resulted in 1.5 miles of stream being restored. This project resulted in installation of 282 structures and 200 pools in Alpowa Creek, west fo Clarkston WA in Asotin County.
The pools were created through eddy or back water processes that ponded water to a depth between 1.5 to 2 feet, or deeper. With future high flows, we envision almost all of the 282 structures either creating better pools or making existing pools better with the sorting of spawning gravels in the tailout areas. Alpowa Creek is a spring-feed system and it may take more time for flows to create pools associated with all the structures. With the current added pools the project area went from 2.8 pools/100 m to 8.4 pools/100 m. With the added structures we went from 7.5 pieces of wood/100 m. to 34 pieces of wood/100 m.
Improved floodplain connection through the strategic placement of wood structures worked both on the main channel and also connecting some smaller springs that had little to no surface water connection during low flows was also achieved.
This project benefits Snake River steelhead and Chinook.