The South Fork (SF) Nooksack (Nuxw7íyem) River Fish Camp (Ts’éq) Integrated Design Project (Fish Camp Project) is a collaborative multi reach-scale project led by the Nooksack Indian Tribe (Tribe) in partner with the Whatcom County Flood Control Zone District (WCFCZD). For this project, the Nooksack Tribe and project partners conducted extensive stakeholder outreach, concepts and alternatives development and analysis, and developed preliminary design for the preferred alternative for restoration of instream habitat in the SF Nooksack River Fish Camp Project Area. Although initially scoped to occur within the Fish Camp Reach from RM 9.1 to 9.6, the Fish Camp Project Area was extended downstream to RM 7.3 near the BNSF bridge to more broadly incorporate community input, elements with the potential to alleviate flood risk to the Acme community, to take advantage of recently developed landowner willingness and to address habitat deficiencies in the south fork downstream of Acme. The Fish Camp Project Area now encompasses the Fish Camp, Acme and BNSF reaches, extending from RM 7.3 to 9.6, as defined by the WRIA 1 Salmon Recovery Plan. The Fish Camp and BNSF reaches are two of three remaining high priority areas (Tier 1) in the lower South Fork for which restoration is needed (WRIA 1 SRFB Grant Restoration and Protection matrices). South Fork Nooksack early Chinook are essential for ESU recovery, but abundances are critically low. The goal of the restoration project is to address South Fork (SF) Nooksack chinook limiting factors of lack of key habitat and low habitat diversity by designing restoration to: (1) increase habitat unit diversity by constructing log jams to form pools; and (2) increase floodplain connectivity and reduce flood risk by removing, lowering or setting back hydromodications to increase floodplain connectivity. A secondary goal of the project is to reduce flood risk in the lower South Fork valley and facilitate development of an integrated habitat restoration/flood risk reduction project that can serve as a pilot project for broader integration of salmon recovery and floodplain management in WRIA 1. Restoration will also benefit ESA-listed steelhead and bull trout; coho, chum, riverine sockeye, and pink salmon; and cutthroat trout. Due to the complexity of the project, extensive outreach required and the Covid-19 pandemic complicating design progress and outreach, several time extensions were requested during the project period. Specific deliverables of the project include: (1) preliminary design report with evaluation of three alternatives and selection of a preferred alternative, (2) preliminary basis of design report, and (3) engineer’s site plan and drawings. The Basis of Design report presents the preliminary design for the project and documents the work completed to support its development.