To view the Final Environmental Impact Report (EIR) for the Hemphill Diversion Structure and Appendices, click the links below.

Hemphill Diversion Structure Project - Final EIR, July 2021

Appendix A - Hemphill Diversion Structure Project - Draft EIR, April 2021

Appendix B - Mitigation Monitoring and Reporting Program

Appendix C - Early Season Special Status Plant Survey Results

Appendix D - Hemphill Diversion Structure Project - Draft EIR Appendices

• Appendix 1 - Notice of Preparation (NOP)/Initial Study
• Appendix 1A - Written Comments and Transcript of NOP Scoping Meeting
• Appendix 2A - Representative Photos
• Appendix 2B - Memo-Cost Estimates for Alternatives Under Review
• Appendix 3.2 - CalEEMod Modeling Outputs
• Appendix 3.3A - Biological Resources Assessment
• Appendix 3.3B - Arborist Survey Report
• Appendix 3.3C - Special-Status Plant Survey
• Appendix 3.3D - Tree Impact Report 
• Appendix 3.5 - Energy Consumption Outputs
• Appendix 3.6 - Custom Soil Resource Reports (U.S. Dept of Agriculture's Natural Resources Conservation Services, 2020)
• Appendix 3.7 - Greenhouse Gasses CalEEMod Modeling Outputs Appendix 3.8A - Sediment Characterization Report
• Appendix 3.8B - Auburn Ravine-Hemphill Diversion Assessment Sediment Transport Study
• Appendix 3.8C - Fish Passage Alternatives Developed for Auburn Ravine’s NID Gaging Site and Hemphill Dam Site
• Appendix 3.8D - Hemphill Diversion Structure Final Report on Field Study Investigations
• Appendix 3.8E - Hemphill Diversion Structure and Fish Passage Assessment – Final Report
• Appendix 3.9 - FHWA Roadway Noise Construction Model Data Outputs (Federal Highway Administration, 2006)