The Big Sur River is a stronghold for one of the most important wild steelhead trout populations on California’s Central Coast. However, in recent decades the Big Sur River steelhead trout population has declined from historical levels. To assess instream habitat conditions and subsequent steelhead trout population conditions, several technical instream flow studies were conducted. The Big Sur River studies focused on quantifying south-central steelhead trout habitat as a function of flow with the aim of identifying what flow regimes would protect habitat conditions for various life-stages of the fish. Stream flow, habitat, topographical, and fish observation data were collected and multiple modeling tools were utilized to assess flow and habitat relationships. Data analysis for the Big Sur River study is complete, and technical reports, final flow regime recommendations, and supporting materials are available below. Resources Final Instream Flow Regime Recommendations, Big Sur River, Monterey County (PDF) Appendix A: CDFW Consideration of Landowner and Stakeholder Input on the Draft Big Sur River Flow Regime Recommendations Report (PDF) Response to Comments on the Draft Instream Flow Regime Recommendations for the Big Sur River, Monterey County (PDF) Big Sur River Study Plan (PDF) Habitat Suitability Criteria: Juvenile Steelhead, Big Sur River, Monterey County (PDF) Instream Flow Evaluation: Steelhead Passage and Connectivity of Riverine and Lagoon Habitats, Big Sur River, Monterey County (PDF) Instream Flow Evaluation: Steelhead Spawning and Rearing, Big Sur River, Monterey County (PDF) Evaluation of Steelhead Passage Flows Using Hydraulic Modeling on an Unregulated Coastal California River (PDF) Seasonal Microhabitat Selectivity by Juvenile Steelhead in a Central California Coastal River (PDF) Big Sur USGS Gage #11143000 Click map to enlarge.