The South Fork Nooksack (SFN) early Chinook population is considered essential for ESU recovery, but abundances are critically low and immediate action is necessary to ensure population persistence. This project constructed two engineered log jam in the South Fork Nooksack River, Hardscrabble Reach, just downstream of the Hardscrabble Creek confluence (RM 5.1). The logjams are designed to encourage scour and provide complex cover in the low-flow wetted channel and are located in an area of cool-water influence, thereby addressing factors most limiting SFN early Chinook in the reach, including lack of deep holding pools with cover, low habitat diversity, and high water temperatures. The design phase of this project was funded in the 2009 grant round (09-1683). Past and current projects in the Acme-Confluence reach have placed or will place clusters of log jams at or around river miles 1.2, 3.8, 6.5; implementing this project (at ~RM 5.1) will reduce spacing to an average 1.4 miles between projects, thereby improving the extent and connectivity of important summer holding and rearing habitat in the lower South Fork, and thus survival and productivity of South Fork Nooksack early Chinook and other salmonids.