Lower Colorado Region Environmental Documents
Links to Lower Colorado Region Area Office Environmental Documents
Phoenix Area Office: https://www.usbr.gov/lc/phoenix/
Southern California Area Office: https://www.usbr.gov/lc/socal/envdocs.html
Yuma Area Office: https://www.usbr.gov/lc/yuma/environmental_docs/environ_docs.html
Regional Office Environmental Documents
Hollywood Boulevard Extension
Draft Environmental Assessment- September 2025Use of Electric Bicycles on Select Reclamation Lands in the Lower Colorado Basin
Final Environmental Assessment and Finding of No Significant Impact- June 2025City of Henderson Utilities Project
Final Environmental Assessment and Finding of No Significant Impact June 2025 (PDF, .4 MB)Appendix A. Engineering Drawings
Appendix B. Biological Opinion
Appendix C. Three Kids Mine and Mill Site Phase 1 ESA
Salton Sea Management Program 10-Year Plan
Finding of No Significant Impact - December 2024 (PDF, .4 MB)US Army Corps of Engineers website of Final Documents
IID 2024-2026 Temporary Colorado River System Water Conservation Project
Finding of No Significant Impact - August 2024 (PDF, .3 MB)Final Environmental Assessment - August 2024 (PDF, 6.4 MB)
Draft Environmental Assessment - June 2024 (PDF, 5.5 MB)
Appendix AQ-1 Regulatory Framework - June 2024 (PDF, 1 MB)
Appendix AQ-2 Regulatory Framework - August 2024 (PDF, .8 MB)
Appendix BIO-1 Regulatory Framework - June 2024 (PDF, .3 MB)
Appendix BIO-2 Potential to Occur - June 2024 (PDF, .5 MB)
Appendix BIO-3 Impact Table - June 2024 (PDF, .6 MB)
Appendix HYDRO-1 Tables - June 2024 (PDF, .6 MB)
Appendix HYDRO-2 ET - June 2024 (PDF, 2 MB)
Appendix HYDRO-3 SSAM - June 2024 (PDF, 2 MB)
Appendix RTC-1 - August 2024 (PDF, 7.5 MB)
Protecting Forests for Water Supply Sustainability in Kohala, Hawai’i, Phases 1 and 2
Finding of No Significant Impact - March 2023 (PDF, 1 MB)
Administration Building and Training Center Xeriscape Project
Final Draft Environmental Assessment and Finding of No Significant Impact - February 2023 (PDF, 14.7 MB)
Arida - Mohave Transmission Line Project
Finding of No Significant Impact - August 2022 (PDF, .5 MB)
Final Environmental Assessment - August 2022
Partial Assignment and Transfer Western Water, LLC to Ehrenberg Improvement District
Finding of No Significant Impact and Final Environmental Assessment - June 2020 (PDF, 1.9 MB)
WaterSMART Grants Program
Finding of No Significant Impact and Final Environmental Assessment - March 2020 (PDF, 1.91 MB)
Southern Nevada Water Authority WaterSMART Grant- Landscape Rebate Program
Finding of No Significant Impact and Final Environmental Assessment - November 2018 (PDF, 1 MB)
Dennis Underwood Conservation Area
Finding of No Significant Impact - January 2019 (PDF, 4.6 MB)
Draft Environmental Assessment/Initial Study with a Negative Declaration - October 2018 (PDF, 2 MB)
Appendix A- October 2018 (PDF, 2 MB)
Appendix B - October 2018 (PDF, 854 KB)
Appendix C - October 2018 (PDF, 423 KB)
Laughlin Races and Events
Finding of No Significant Impact - September 2018 (PDF, 373 KB)
Laughlin Races and Events Environmental Assessment - September 2018 (PDF, 1 MB)
Finding of No Significant Impact and Supplemental Environmental Assessment for Planet Ranch Conservation Area
Finding of No Significant Impact and Final Environmental Assessment - July 2018 (PDF, 2 MB)
Right of Use - Downgradient Study Area Activities
Finding of No Significant Impact and Final Environmental Assessment - March 2018 (PDF, 4 MB)
Draft EA Right of Use Downgradient Study Area - January 2018 (PDF, 3 MB)
Finding of No Significant Impact for Final Environmental Assessment for the Final Amendment to add Northern Mexican Gartersnake to the Lower Colorado River Multi-Species Conservation Program as a Covered Species
Final Environmental Assessment - February 2018 (PDF, 2 MB)
Finding of No Significant Impact - March 2018 (PDF, 80 KB)
Hoover Dam Fiber Optic Cable Replacement
Finding of No Significant Impact and Final Environmental Assessment - March, 2018 (PDF, 6 MB)
Draft Environmental Assessment - December 2017 (PDF, 4 MB)
Planet Ranch Conservation Area
Finding of No Significant Impact and
Final Environmental Assessment for Planet Ranch Conservation Area - March 2018
(PDF, 5 MB)
Draft Environmental Assessment - December 2017 (PDF, 12 MB)
Finding of No Significant Impact for Alternative 1 from the Final Environmental Assessment for the Southern Nevada Intertie (Harry Allen to Eldorado 500 kV Transmission) Project
Final Environmental Assessment - November 2017 (PDF, 13 MB)
Finding of No Significant Impact - September 2017 (PDF, 112 KB)
Washington County Water Conservancy District WaterSMART Small-Scale Water Efficiency Projects
Finding of No Significant Impact and Final Environmental Assessment LC-17-27 (PDF, 787 KB)
Finding of No Significant Impact and Final Environmental Assessment LC-19-06 (PDF, 505 KB)
TransWest Express Transmission Project LC-UC-16-17
Volume 1 - Record of Decision - June 2017 (PDF, 23 MB)
Volume 2 - Record of Decision - June 2017 (PDF, 318 MB)
Arizona Heritage Trail System
Arizona Heritage Trail System Finding of No Significant Impact and Final Environmental Assessment - November 2018
(PDF, 15.6 MB)
Arizona Heritage Trail System Draft Environmental Assessment - April 2017 (PDF, 2.6 MB)
Toquerville Secondary Water System Smart Meter Installation Project
Finding of No Significant Impact and Final Environmental Assessment LC-17-08 - February 2017 (PDF, 808 KB)
Archived Lower Colorado Regional Office Environmental Documents - Alphabetical Listing
Archived Lower Colorado Regional Office Environmental Documents - Chronological Listing
