- Reclamation
- Colorado River Basin
- Colorado River Post 2026 Operations
- Draft Environmental Impact Statement
Post-2026 Operational Guidelines and Strategies for Lake Powell and Lake Mead – Draft Environmental Impact Statement
Reclamation released the Draft Environmental Impact Statement for Post-2026 Operational Guidelines and Strategies for Lake Powell and Lake Mead. A Notice of Availability of the Draft EIS was published in the Federal Register on January 16, 2026, for a 45-day public review and comment period that ended March 2, 2026.
For additional information, please email: crbpost2026@usbr.gov
Executive Summary (7.8 MB, PDF)
Volume I – Main Body
- Cover, Abstract, Table of Contents, and Acronyms (2.72 MB, PDF)
- Chapter 1 - Purpose and Need (2.6 MB, PDF)
- Chapter 2 - Description of Alternatives (943 KB, PDF)
- Chapter 3 - Affected Environment and Environmental Consequences (5 MB, PDF)
- Chapter 4 - Consultation and Coordination (228 KB, PDF)
- Preparers, References, Glossary, and Index (738 KB, PDF)
Volume II – Supporting Appendices
- Cover, Table Of Contents (713 KB, PDF)
- A. CRSS Model Documentation (3.6 MB, PDF)
- B. Modeling Assumptions - Lake Powell and Lake Mead Storage and Delivery of Conserved Water (805 KB, PDF)
- C. Shortage Allocation Model and Alternative Distribution Model Documentation (5.8 MB, PDF)
- D. Sensitivity Analysis - Effects of Natural Flow Percentage Used for the Supply Driven Alternative (522 KB, PDF)
- E. DMDU Overview and Approach (353 KB, PDF)
- F. Approach to Hydrologic Uncertainty (1 MB, PDF)
- G. CRSS Initial Conditions (826 KB, PDF)
- H. Sensitivity Analysis - Effects of Demand Schedule Assumptions on Modeled Unused Tribal Water Available for Storage in the Enhanced Coordination Alternative (546 KB, PDF)
- I. Sensitivity Analysis - Effects of Alternate Upper Basin Demand Scenarios on Operations at Lake Powell and Lake Mead (5.5 MB, PDF)
- J. Sensitivity Analysis - Effects of Assumed Parameter Values on 602(a) Storage (353 KB, PDF)
- K. Sensitivity Analysis - Effects of Modeling Assumptions with Regard to Future Water Deliveries to Mexico (871 KB, PDF)
- L. Upper Basin States Depletion Schedules (217 KB, PDF)
- M. International Border Region of the Colorado River (4.6 MB, PDF)
- N. Lower Division States Depletion Schedules (872 KB, PDF)
- O. Analysis of Powell Infrastructure Protection Releases (547 KB, PDF)
Volume III – Technical Appendices
- Cover, Table ofContents (680 KB, PDF)
- TA-3 - Hydrologic Resources (6.6 MB, PDF)
- TA-4 - Water Deliveries (4.9 KB, PDF)
- TA-5 - Geomorphology and Sediment (2.3 MB, PDF)
- TA-6 - Water Quality (1.9 MB, PDF)
- TA-7 - Air Quality (3.3 MB, PDF)
- TA-8 - Fish and Aquatic Resources (10.4 MB, PDF)
- TA-9 - Vegetation (3.4 MB, PDF)
- TA-10 - Terrestrial Wildlife (900 KB, PDF)
- TA-11 - Cultural Resources (1.3 MB, PDF)
- TA-12 - Paleontological Resources (20 MB, PDF)
- TA-13 - Tribal Resource (400 KB, PDF)
- TA-14 - Recreation (1.1 MB, PDF)
- TA-15 - Dams and Electrical Power Resources (4.1 MB, PDF)
- TA-16 - Socioeconomics (3.1 MB, PDF)
- TA 17 - Population and Land Use (1.7 MB, PDF)
- TA 18 - Indian Trust Assets (3.9 MB, PDF)
- TA 19 - Visual Resources (1 MB, PDF)
The Draft EIS Public Review and Comment Process is available for viewing and download.
