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
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
