DESCRIPTION
The Asotin County Public Utility District and Palouse Conservation
District used this grant to increase the quality and diversity of
steelhead habitat in a 1.65-mile reach of upper Alpowa Creek, east of
Clarkston, WA. The creek is home ESA threatened A-run summer steelhead
and initial surveys indicate that adequate pools for over-winter
juveniles and adult holding and summer rearing are lacking throughout
Alpowa Creek watershed. The Asotin County Public Utility District and
Palouse Conservation District installed 202 post assisted log structures
(PALS), similar to what is being implemented with the Asotin Creek
Intensively Monitored Watershed. The wood structures resulted in the
creation of 150 pools over the two years of implementation, increasing
the number of pools from 2.8 pools per 100 meters to 8.4 pools per 100
meters. The large wood structures also improved the creek's connection
to its floodplain by backwatering flow and directing high flows into
abandoned channels. The Asotin County Public Utility District, Palouse
CD, Snake River Salmon Recovery Board, and US Forest Service contributed
over $55,549 in donated materials and labor.
The Asotin County Public Utility District and Palouse Conservation District used this grant to increase the quality and diversity of steelhead habitat in a 1.65-mile reach of upper Alpowa Creek, east of Clarkston, WA. The creek is home to steelhead, which are listed as threatened with the risk of extinction under the federal Endangered Species Act. One of the factors limiting the growth of the steelhead population is the lack of deep pools with complex structure for over-wintering juveniles and adults in the summer. The Asotin County Public Utility District and Palouse Conservation District placed 202 structures comprised of over 450 large logs and tree root wads in the creek to slow the creek and create pools where steelhead can rest, hide from predators, feed, and grow. The wood structures resulted in the creation of 150 pools over the two years of implementation, increasing the number of pools from 2.8 pools per 100 meters to 8.4 pools per 100 meters. The large wood structures also improved the creek’s connection to its floodplain by backwatering flow and directing high flows into abandoned channels.
The total project cost was more than $44,000 higher than the original application estimate. The higher cost can primarily be attributed to two factors. One is that the sponsor constructed 10 additional structures along 0.15 miles upstream of the original project reach since extra material was available and the added structures further supported project objectives. The other factor is that the cost of labor and material to obtain and haul woody material to the site averaged about $50 more per structure than estimated. But note that all labor, material and equipment costs associated with securing and hauling the material were donated to the project so the higher total project cost was almost entirely accounted for through increased project match. The Asotin County Public Utility District and US Forest Service contributed over $55,000 in donated materials, equipment, and labor to the project.