Removal one undersized (6' diameter) round culverts with a bottomless-arch culverts. Bottomless arch culverts have the capacity to pass the 100 year flood event. This capacity will reduce the risk of this 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.