DESCRIPTION
Removal two undersized round culverts with two pre-formed bridge spans.
1) Marchand Culvert (RM 9) An undersized culvert located on a private access road was replaced with a pre-formed bridge span and set on a precast sill. Cost share includes NRCS and USFWS.
2) Sam Culvert (RM 9.5) An undersized culvert located on a BIA access road was replaced by a pre-formed bridge span and set on a precast sill.
Both projects were Cost shared includes NRCS and USFWS.
This capacity will reduce the risk of these two road crossings from washing out and delivering large volumes of sediment to established spawning habitat for summer steelhead. Omak Creek is one of the few tributaries in the Okanogan River Basin that currently support summer steelhead. Since 1997, actions have been taken which have resulted in unimpeded access to the lower 5 miles of Omak Creek, to include the installation of three in-stream structures at the base of Mission Falls (September 2005) to further extend the range of summer steelhead an additional 17 miles. The greatest impact to steelhead production in Omak Creek is the proportion of fine sediment in the streambed.