Lower Colorado Region

Yuma Area Office

In Process Environmental Documents

• Yuma County's Transfer Station Project Environmental Assessment
• City of Yuma's Conveyance Project Environmental Assessment

Environmental Documents

5-Mile Zone Protective and Regulatory Pumping Unit

• 5-Mile Zone Resource Management Plan/Environmental Assessment (PDF, 416 KB)

Avenue 50 Canal Crossing

• Final Environmental Assessment (PDF, 14 MB)
• Final FONSI - December 2017 (PDF, 209 KB)
• Draft Environmental Assessment (PDF, 10 MB)

Cibola Old Channel Restoration Project

• Final Environmental Assessment w/ Appendix A and B (PDF, 9.27 MB)

• Final FONSI - December 2018 (PDF, 112 KB)

City of San Luis County 24th Street - 10th Avenue (Avenue H) to Avenue F-1/2

• Draft Environmental Assessment (PDF, 6 MB)

City of Yuma 12th Street Project

• Final Environmental Assessment (PDF, 4.84 MB)
• Final FONSI - September 2010 (PDF, 60 KB)

City of Yuma Land Conveyance Project

• Final Environmental Assessment (PDF, 6.20 MB)
• Final FONSI - June 2010 (PDF, 26 KB)

Coachella Canal Area
Coachella Canal Area Resource Management Plan/Environmental Assessment

• Introduction (PDF, 1.5 MB)
• Environmental Assessment - Chapter 1 (PDF, 11.9 MB)
• Environmental Assessment - Chapter 2 (PDF, 6.2 MB)
• Environmental Assessment - Chapter 3 (PDF, 145 KB)
• Environmental Assessment - Chapter 4 (PDF, 752 KB)
• Environmental Assessment - Chapter 5
• Chapter 5 - Part 1 (PDF, 7.24 MB)
• Chapter 5 - Part 2 (PDF, 10.5 MB)
• Chapter 5 - Part 3 (PDF, 1.06 MB)
• Chapter 5 - Part 4 (PDF, 3.30 MB)
• Chapter 5 - Part 5 (PDF, 83.8 KB)
• Environmental Assessment - Chapter 6 (PDF, 7.18 MB)
• Environmental Assessment - Attachments (PDF, 5.77 MB)
• Environmental Assessment - Appendices (PDF, 4.21 MB)

Coachella Valley Water District Mid-Canal Storage Project

• Draft Environmental Assessment (PDF, 22 MB)

DICA Partners Water Conveyance Project

• Draft Environmental Assessment (PDF, 7 MB)
• Appendix A - Biological Resources Assessment (PDF, 5.32 MB)
  
• Appendix B - Geology and Geotechnical Investigation (PDF, 3.3 MB)
  
• Appendix C - Phase 1 Environmental Site Assessment (PDF, 30.7 MB)
  

Drop 2 Reservoir Project

• Final Environmental Assessment Part 1(PDF, 3.46 MB)
• Final EA Part 2 (PDF, 4.2 MB)
• Final EA Part 3 (PDF, 122 KB)
• App A - Agency and Public Scoping (PDF, 245 KB)
• App B - Evaluation of Alternative Alignments for the Drop 2 Reservoir Canal (PDF, 5.47 MB)
• App C - Assessment of Flows Passing Morelos Dam with Future Drop 2 Reservoir Ops (PDF, 4.93 MB)
• App D - Impacts to Groundwater Levels South of Morelos Dam due to Drop 2 Reservoir Ops (PDF, 85 KB)
• App E - Sensitive Plant and Wildlife Survey Report (PDF, 3.97 MB)
• App F - Air Quality (PDF, 1.47 MB)
• Final Environmental Determination (PDF, 404 KB)

East Highline Reservoir and Intake Channel Project

• Final FONSI(PDF, 1 MB)
• Final Environmental Assessment(PDF, 2.1 MB)
• Appendix A - Draft Environmental Impact Report (PDF, 3.03 MB)
  
• Appendix B - Resources Not Further Considered (PDF, 279 KB)
  
• Appendix C - Air Quality and Emmissions (PDF, 4.04 MB)
  
• Appendix E - Supplemental CRA (PDF, 74 KB)
  
• Appendix F - Field Noise Measurement (PDF, 1.1 MB)
  
• Appendix C - Air Quality and Emmissions (PDF, 4.04 MB)
  

Hunters Hole Restoration Project

• Final FONSI (PDF, 244 KB)
• Final Supplemental FONSI (PDF, 115 KB)
• Final Environmental Assessment (PDF, 1.74 MB) 
  Appendix - Coordination (PDF, 4.61 MB)
• Final Supplemental Environmental Assessment (PDF, 1 MB)
  
• Draft Environmental Assessment (PDF, 5.62 MB)

Proposed Imperial Dam Electrical Upgrades

• Final FONSI (PDF, 1.39 MB)
• Final Environmental Assessment (PDF, 1.13 MB)

Laguna Reservoir Restoration Project

• Final FONSI (PDF, 272 KB)
• Environmental Assessment - Part 1 (PDF, 9.3 MB)
• Environmental Assessment - Appendices (PDF, 9.3 MB)

La Quinta Peninsular Bighorn Sheep Barrier Project

• Final FONSI (PDF, 502 KB)
• Environmental Assessment (PDF, 20 MB)
  
Appendix A  (PDF, 12 MB)
Appendix B  (PDF, 9.1 MB)
Appendix C  (PDF, 79 KB)
Appendix D  (PDF, 803 KB)
Appendix E  (PDF, 6.9 MB)       

Needles-Topock Area Bankline Stabilization

• Final FONSI (PDF, 94 KB)
• Environmental Assessment - Part 1 (PDF, 607 KB)
• Environmental Assessment - Appendices 1 (PDF, 4.18 MB)
• Environmental Assessment - Appendices 2 (PDF, 6.66 MB)

Quarry Operations on the Lower Colorado River

• Final Programmatic Environmental Assessment (PDF, 1.67 MB)
  Appendix A - Scoping and Coordination (PDF, 5.35 MB)
  Appendix B - Maps (PDF, 7.69 MB)       
• Final Biological Assessment (PDF, 1.30 MB)
  Appendix 1 - Coordination and Correspondence (PDF, 2.77 MB) 
  Appendix 2 - Site Photos and Data Forms (PDF, 7.79 MB)
  Appendix 3 - Desert Tortoise Brief (PDF, 1.32 MB) 
  Appendix 4 - Programmatic Biological Opinion (PDF, 2.70 MB)

Rolle Airfield

• Final FONSI (PDF, 105 KB)
• Final Environmental Assessment (PDF, 10 MB)
• Draft Environmental Assessment (PDF, 11 MB)

Unmeasured Flow Salinity Study Project

• Final Environmental Assessment (PDF, 1.3 MB)
• Finding of No Significant Impact (FONSI) (PDF, 7.1 MB)
• Draft Environmental Assessment (PDF, 7.1 MB)

Upland Wash Sediment Control Project

• Final Environmental Assessment with Correspondence (PDF, 37 MB)
• Draft Environmental Assessment (PDF, 6.7 MB)

Wellton-Mohawk Title Transfer

• Final Environmental Impact Statement
• Record of Decision (PDF, 1.1 MB)

Wellton-Mohawk Water Delivery Contract Amendment

• Final FONSI -- March 2008 (PDF, 77 KB)
• Environmental Assessment -- January 2008 (PDF, 119 KB)

Yuma, Arizona Welcome Center Parking Lot and Future Welcome Center

• Final Environmental Assessment Part 1 (PDF, 7.09 MB)
• Final EA Part 2 (PDF, 10.74 MB)
• Final FONSI - January 2009 (PDF, 216 KB)

Yuma County 8th Street Realignment Project

• Final FONSI - July 2010 (PDF, 48 KB)
• Final Environmental Assessment (PDF, 5.45 MB)
  Appendix B - MOA (PDF, 1.44 MB)

Yuma County's Transfer Station Project

• Draft Environmental Assessment(PDF, 7 MB

Yuma Desalting Plant Pilot Run (YDP)

• Funding Agreement - October 29, 2009 (PDF, 2.11 MB)
  
  
• January 14, 2009 - Letter From Municipal Utilities Requesting YDP Pilot Run (PDF, 300 KB)
  
  
• Final Environmental Assessment (PDF, 3.43 MB)
  Appendices A - D (PDF, 6.86 MB)
  Appendix E (PDF, 347.89 KB) 
  
  
• Final FONSI - September 30, 2009 (PDF, 215 KB)
  Comments:
  Environmental Defense Fund - Sept 25, 2009 (PDF, 172 KB)
  U.S. International Boundary & Water Commission - Sept 28, 2009 (PDF, 505 KB)
  Upper Colorado River Commission - Sept 28, 2009 (PDF, 611 KB)
  Colorado River Board of California - Sept 28, 2009 (PDF, 499 KB)
  

Yuma East Wetlands Restoration

• Yuma East Wetlands Restoration and Enhancement Project Environmental Assessment (PDF, 4.28 MB)

Yuma TS-8 to San Luis 69KV Transmission Line Project

• Environmental Assessment (PDF, 1.7 MB)
• FONSI (PDF, 24 KB)

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