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The Trinity River Restoration Program seeks to restore and maintain salmonid habitats in the Trinity River downstream of Lewiston Dam, California. To help monitor the effectiveness of the Program, and to guide the work going forward, we reviewed past reports and provided synthesized information to rehabilitation site designers for future restoration efforts. Escapement of spring- and fall-run Chinook Salmon, Coho Salmon, and steelhead to natural spawning areas and to the Trinity River Hatchery from 1978 to 2018 are summarized, as are natural- and hatchery-origin compositions, tributary use, and pre-spawn mortality from various monitoring projects. Trends in spawning distribution from redd surveys were assessed using data sets from 2002 to 2017 at restoration site, restoration reach, and system scales. Further analyses in this report include response to flow management, redd superimposition and dewatering, and a comparison of the responses of Chinook Salmon spawning between restored and unrestored areas.