Environmental Impact Statement (EIS) Database
EIS Details
EIS Title
Willamette Valley System Operations and MaintenanceEIS Number
20260061Unique Identification Number
Document Type
Final SupplementFederal Register Date
05/22/2026EIS Comment Due/ Review Period Date
06/22/2026Amended Notice Date
Amended Notice
Supplemental Information
Issuance of Notice of Intent to Prepare an EIS:
05/16/2025EPA Comment Letter Date
06/09/2026State or Territory
ORLead Agency
U.S. Army Corps of EngineersContact Name
Liz OliverContact Phone
503-808-4712Rating (if Draft EIS)
As of October 2018, EPA discontinued the use of ratings for Draft EISs.
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WVS_Final_SEIS_May2026.pdf (310 pp, 5,877 K)
USACE WVS FSEIS_Appendix A_ Alternatives Development_No Attachments_May2026.pdf (147 pp, 3,257 K)
USACE WVS FSEIS_Appendix B_Hydrologic Processes_May2026.pdf (528 pp, 42,958 K)
USACE WVS FSEIS_Appendix C_River Mechanics_May2026.pdf (91 pp, 3,606 K)
USACE WVS FSEIS_Appendix D_Water Quality_May2026.pdf (650 pp, 31,379 K)
USACE WVS FSEIS_Appendix E_Part1_Fish and Aquatic Habitat Analyses_May2026.pdf (281 pp, 2,499 K)
USACE WVS FSEIS_Appendix E_Part2_Fish and Aquatic Habitat Analyses_May2026.pdf (101 pp, 1,473 K)
USACE WVS FSEIS_Appendix E_Part3_Fish_May2026.pdf (97 pp, 3,491 K)
USACE WVS FSEIS_Appendix F1_Climate Change_May2026.pdf (96 pp, 7,016 K)
USACE WVS FSEIS_Appendix F2_Climate Change Supplemental Info_May2026.pdf (86 pp, 11,909 K)
USACE WVS FSEIS_Appendix G_Hydropower_May2026.pdf (96 pp, 2,350 K)
USACE WVS FSEIS_Appendix H_Dam Safety_May2026.pdf (18 pp, 347 K)
USACE WVS FSEIS_Appendix I_Socioeconomics_May2026.pdf (55 pp, 1,032 K)
USACE WVS FSEIS_Appendix J_Water Supply Analysis_May2026.pdf (95 pp, 7,276 K)
USACE WVS FSEIS_Appendix K_Recreation_May2026.pdf (98 pp, 2,702 K)
USACE WVS FSEIS_Appendix L_Cooperating Agencies_May2026.pdf (8 pp, 369 K)
USACE WVS FSEIS_Appendix M_Costs_May2026.pdf (15 pp, 430 K)
USACE WVS FSEIS_Appendix N_IMPLEMENTATION AND ADAPTIVE_May2026.pdf (137 pp, 3,719 K)
USACE WVS FSEIS_Appendix O_Tribal Coordination and Perspectives_May2026.pdf (38 pp, 4,001 K)
USACE WVS FSEIS_Appendix P_Public Scoping Report_May2026.pdf (661 pp, 34,814 K)
USACE WVS FSEIS_Appendix U_Air Quality_May2026.pdf (16 pp, 490 K)
USACE WVS FSEIS_Appendix Q_Statutory Compliance Documentation_May 2026.pdf (477 pp, 38,995 K)
USACE WVS FSEIS_Appendix S_Facilities_May2026.pdf (56 pp, 11,691 K)
USACE WVS FEIS_Appendix V_DEIS Comments and Responses_May2026.pdf (951 pp, 23,632 K)
USACE WVS FSEIS_Appendix R_VISUAL RESOURCES INVENTORY_May2026.pdf (10 pp, 298 K)
USACE WVS FSEIS_Appendix T_Cultural Resources_May2026.pdf (14 pp, 408 K)
USACE WVS FSEIS_Appendix W_SEIS Public Comments_May2026.pdf (660 pp, 90,971 K)
Comment Letter(s):20260061.pdf (1 pp, 157 K)