DESCRIPTION
The Makah Tribe used this funding to construct five log jams in the Sekiu River, a wood deprived system. Woody debris is essential for salmonid habitat and functioning riverine habitat systems. This project was located in the Sekiu River, between the confluence with Carpenter Creek at river mile 1.3 and the confluence of No Name Creek in the in the northwestern portion of Clallam County and south of Hwy 112.
Logjams reduce stream energy, trap sediment, and increase cover, holding pools, tail-out spawning areas, and off-channel and side-channel habitat. Independent in-stream large woody debris was placed downstream to reduce bank destabilization.
Analysis of early aerial photos identified log jam and side channel locations on the lower Sekiu River mainstem before the area was logged. When heavy logging began, old-growth timber was rafted down-river. Existing jams were removed and the channel was scoured. The old jams no longer exist, and the river has largely abandoned its side channels.
Past activities and on-going disturbance had created a stream channel lacking large woody debris and short-term sources for wood input. The Sekiu River's high flow during winter months allowed it to flush most wood comng into the channel. The constructed jams will trap wood until the riparian timber grows large enough to resist flushing. The jams aim to provide significant habitat for salmonids and their prey.
The five log jams consist of:
- Jam 1, a full-spanning jam constructed with three key pieces with root wads attached.
- Jam 2, an auxiliary structure protecting the river from the road just below Jam 3.
- Jam 3, containing two key pieces w/ rootwads, and occupying about 1/2 of the bank-full channel.
- Jam 4, an auxiliary structure protecting the river from the road just below Jam 5.
- Jam 5, containing two key pieces w/ rootwads, and occupying about 1/2 of the bank-full channel.