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
2026-05-22 00:00:00.0EIS Comment Due/ Review Period Date
2026-06-22 00:00:00.0Amended Notice Date
Amended Notice
Supplemental Information
Issuance of Notice of Intent to Prepare an EIS:
2025-05-16 00:00:00.0EPA Comment Letter Date
State 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, 5876.7548828125 K)
USACE WVS FSEIS_Appendix A_ Alternatives Development_No Attachments_May2026.pdf (147 pp, 3257.427734375 K)
USACE WVS FSEIS_Appendix B_Hydrologic Processes_May2026.pdf (528 pp, 42958.3955078125 K)
USACE WVS FSEIS_Appendix C_River Mechanics_May2026.pdf (91 pp, 3606.2861328125 K)
USACE WVS FSEIS_Appendix D_Water Quality_May2026.pdf (650 pp, 31379.4697265625 K)
USACE WVS FSEIS_Appendix E_Part1_Fish and Aquatic Habitat Analyses_May2026.pdf (281 pp, 2498.576171875 K)
USACE WVS FSEIS_Appendix E_Part2_Fish and Aquatic Habitat Analyses_May2026.pdf (101 pp, 1473.447265625 K)
USACE WVS FSEIS_Appendix E_Part3_Fish_May2026.pdf (97 pp, 3491.0859375 K)
USACE WVS FSEIS_Appendix F1_Climate Change_May2026.pdf (96 pp, 7016.3271484375 K)
USACE WVS FSEIS_Appendix F2_Climate Change Supplemental Info_May2026.pdf (86 pp, 11908.5869140625 K)
USACE WVS FSEIS_Appendix G_Hydropower_May2026.pdf (96 pp, 2350.0166015625 K)
USACE WVS FSEIS_Appendix H_Dam Safety_May2026.pdf (18 pp, 347.193359375 K)
USACE WVS FSEIS_Appendix I_Socioeconomics_May2026.pdf (55 pp, 1032.0029296875 K)
USACE WVS FSEIS_Appendix J_Water Supply Analysis_May2026.pdf (95 pp, 7276.17578125 K)
USACE WVS FSEIS_Appendix K_Recreation_May2026.pdf (98 pp, 2702.099609375 K)
USACE WVS FSEIS_Appendix L_Cooperating Agencies_May2026.pdf (8 pp, 369.3642578125 K)
USACE WVS FSEIS_Appendix M_Costs_May2026.pdf (15 pp, 429.849609375 K)
USACE WVS FSEIS_Appendix N_IMPLEMENTATION AND ADAPTIVE_May2026.pdf (137 pp, 3718.6591796875 K)
USACE WVS FSEIS_Appendix O_Tribal Coordination and Perspectives_May2026.pdf (38 pp, 4000.6064453125 K)
USACE WVS FSEIS_Appendix P_Public Scoping Report_May2026.pdf (661 pp, 34814.31640625 K)
USACE WVS FSEIS_Appendix U_Air Quality_May2026.pdf (16 pp, 490.1708984375 K)
USACE WVS FSEIS_Appendix Q_Statutory Compliance Documentation_May 2026.pdf (477 pp, 38995.23046875 K)
USACE WVS FSEIS_Appendix S_Facilities_May2026.pdf (56 pp, 11691.0322265625 K)
USACE WVS FEIS_Appendix V_DEIS Comments and Responses_May2026.pdf (951 pp, 23632.36328125 K)
USACE WVS FSEIS_Appendix R_VISUAL RESOURCES INVENTORY_May2026.pdf (10 pp, 298.173828125 K)
USACE WVS FSEIS_Appendix T_Cultural Resources_May2026.pdf (14 pp, 408.466796875 K)
USACE WVS FSEIS_Appendix W_SEIS Public Comments_May2026.pdf (660 pp, 90970.9873046875 K)