The U.S. Army Corps of Engineers, Walla Walla District (USACE), intends to prepare a Tiered Environmental Impact Statement (TEIS), in compliance with the National Environmental Policy Act (NEPA), for long-term sediment management of the federal navigation channel at or near the confluence of the lower Snake and Clearwater Rivers (Confluence), in support of the commercial navigation project purpose within the Lower Snake River Projects (LSRP). The TEIS would be tiered from, and prepared in accordance with, the 2014 Lower Snake River Programmatic Sediment Management Plan, Final Environmental Impact Statement (PSMP FEIS).

Per the PSMP (2014 PSMP FEIS Appendix A, Section 3.3.3.1), the triggers for development of a long-term solution have been met. TEIS alternatives will be formulated based on the PSMP’s eight (8) measures applicable to Future Forecast Need Actions for Navigation and will be analyzed to determine the most cost-effective, technically acceptable, and environmentally acceptable action(s) to manage the sediment depositing at the Confluence.

Questions about the project and TEIS can be answered by Ms. Kathryn Wenger, Project Manager, Walla Walla District, Corps of Engineers, CENWW-PPL-P, 201 North Third Avenue, Walla Walla, WA  99362-1876, phone (509) 527-7294, email kathryn.f.wenger@usace.army.mil; or Mr. Ben Tice, Biologist, Walla Walla District, Corps of Engineers, CENWW-PPL-C, 201 North Third Avenue, Walla Walla, WA  99362-1876, phone (509) 527-7267, email ben.j.tice@usace.army.mil.

Scoping Presentation information

Final Signed Finding of no Significant Impact

Final Environmental Assessment

Appendix A (Water Facility Planning Study)

Interested parties are hereby notified that Commander KingSlack of the U.S. Army Corps of Engineers, Walla Walla District (USACE), signed the Final Finding of No Significant Impact (FONSI) for the Stilling Basin Sediment Removal Project located at Lower Granite, Little Goose, and Lower Monumental locks and dams. 

USACE prepared a draft FONSI and Environmental Assessment for the proposed action which was sent out for a 15-day public review period which began on March 15, 2024. No significant impacts to environmental resources were identified during the environmental analysis or public comment period, therefore an Environmental Impact Statement is not required.

Questions regarding the Stilling Basin Sediment Removal Project can be directed to Laura Wiggins at Laura.A.Wiggins@usace.army.mil.

Final Environmental Assessment

Final Finding of No Significant Impact

Appendix A

Appendix B

Appendix C

Appendix D

The U.S. Army Corps of Engineers, Walla Walla District (USACE), will release the draft Finding of No Significant Impact (FONSI) and Integrated Letter Report and Programmatic Environmental Assessment (LR/EA) for the Federal Participation in Aquatic Invasive Species Prevention and Control – Russian River Basin for a 30-day public review and comment period beginning on June 22, 2024.

USACE proposes to participate in a cost-share program for ongoing or future non-federally managed programs to prevent and to coordinate the establishment of new, or bolster existing, watercraft inspection stations maintained and operated by non-Federal sponsors (NFSs) in California to help reduce the risks associated with infestations of aquatic invasive species (AIS) at USACE reservoirs and waters of the United States within the Russian River Basin (RRB). This program, if funded by Congress, would be cost shared at 50 percent with each non-Federal entity. Eligible activities would include, but are not limited to, the establishment and operation of watercraft inspection stations, monitoring programs, contingency planning, and rapid response planning and preparation.

If you have any questions or need additional information, please contact Environmental Resource Specialist, Mr. John Hook, at 509-527-7239 or john.d.hook@usace.army.mil.

draft Finding of No Significant Impact (FONSI)

Integrated Letter Report and Programmatic Environmental Assessment (LR/EA)

Biological Evaluation

Draft Finding of No Significant Impact

Draft Letter Report and Environmental Assessment

Appendix: Biological Evaluation

The U.S. Army Corps of Engineers, Walla Walla District (USACE), invites public comments on the Draft Finding of No Significant Impact (FONSI) and Environmental Assessment (EA) for the proposed Federal Participation in Aquatic Invasive Species Prevention and Control in the Arkansas River Basin (ARB).

USACE proposes to participate in a cost share program for ongoing or future state-managed/non-Federally managed programs to prevent and control the spread of aquatic invasive species (AIS) in the states of Arkansas, Colorado, Kansas, Missouri, New Mexico, Oklahoma, and Texas within ARB. The ARB AIS program, if funded by Congress, would be cost shared at 50 percent with each state/non-Federal entity. Eligible activities would include, but are not limited to, the establishment and operation of watercraft inspection stations, monitoring programs, contingency planning, and rapid response planning and preparation. Federal participation in these activities would aid in the prevention, control, and progressive eradication of noxious aquatic plant growths and aquatic invasive species from the navigable waters, tributary streams, connecting channels, and other allied waters of the United States, in the combined interest of navigation, flood control, drainage, agriculture, fish and wildlife conservation, public health, and related purposes

The 30-day public comment period starts on June 22, 2024, and concludes on July 22, 2024. Comments must be postmarked or emailed no later than July 22, 2024, to be considered as part of the public record. Comments should be mailed to:

You may also submit comments via email to NEPANWW@usace.army.mil,  inserting: “AIS Arkansas River Basin Cost Share Program NEPA Comments” into the subject line.

If you have questions or need additional information, please email or call John Hook, Environmental Resources Specialist at john.d.hook@usace.army.mil or 509-527-7239.

Interested parties are hereby notified that Commander KingSlack of the U.S. Army Corps of Engineers, Walla Walla District (USACE), signed the Final Finding of No Significant Impact (FONSI) for the Area 380 Drainage Improvement project. 

USACE prepared a draft FONSI and Environmental Assessment for the proposed action which was sent out for a 30-day public review period which began on April 12, 2024 and concluded on May 12, 2024. No significant impacts to environmental resources were identified during the environmental analysis or public comment period, therefore an Environmental Impact Statement is not required.

Questions regarding the Stilling Basin Sediment Removal Project can be directed to Laura Ann Wiggins at Laura.A.Wiggins@usace.army.mil.

Final Finding of No Significant Impact

Final Environmental Assessment

The U.S. Army Corps of Engineers, Walla Walla District, will be releasing the draft Finding of No Significant Impact (FONSI) and Columbia Park Land Conveyance Environmental Assessment (EA) for the Proposed Transfer of 72-acres of Federal Lands to the City of Kennewick for public review on January 16, 2024. This EA and draft FONSI contain the USACE’s consideration of possible environmental impacts associated with the proposed land transfer.

Any questions can be directed to Mr. John Hook at 509-527-7239 or at john.d.hook@usace.army.mil.

Draft FONSI

Draft Environmental Assessment

Interested parties are hereby notified that Commander KingSlack of the U.S. Army Corps of Engineers, Walla Walla District (USACE), signed the Final Finding of No Significant Impact (FONSI) for the City of Genesee (City) Wastewater Improvements Project located in Genesee, Idaho.  USACE has authority to financially assist the City under Section 595 of the Water Resources Development Act of 1999 (Public Law [PL] 106-53), as amended and may provide design and construction assistance to non-federal interests for water-related environmental infrastructure and resources protection and development projects. USACE is proposing to share costs with the City of Genesee for construction of one component of the City’s overall wastewater system improvements— a new tertiary treatment for ammonia removal referred to as the Submerged Aerated Rock Filter (SARF) system, and associated USACE review and coordination.

USACE prepared a draft FONSI for the proposed action which was sent out for a 15-day public review period which began on October 18, 2023. No significant impacts to environmental resources were identified during the environmental analysis or public comment period, therefore an Environmental Impact Statement is not required. Two comments were received and addressed.

Questions regarding the wastewater system improvements project can be directed to Michele Palmer at (509) 975-9659.

Signed FONSI

Attachment A:_MW Environmental Information Document

Attachments B-D

The links below include the Finding of No Significant Impact, Integrated Letter Report and Environmental Assessment, and supporting appendices.

Finding of No Significant Impact

Little Wood River, Gooding, Idaho, Integrated Letter Report and EA

Appendix A, Implementation Guidance for Section 3057 of WRDA 2007

Appendix B, Section 905b Report

Appendix C, Hydrology and Hydraulics Calculations

Appendix D, Drawings

Appendix E, Cost Engineering

Appendix F, Real Estate Plan

Appendix G, Biological Evaluation

Appendix H, Fish and Wildlife Coordination Act Documentation

Appendix I, Hazardous, Toxic, and Radioactive Waste Report

Appendix J, Climate Change Assessment

Appendix K, Greenhouse Gas Emission Evaluation

Appendix L, NHPA Memorandum of Agreement between USACE and Idaho SHPO

Notice of Availability of the Final Finding of No Significant Impact (FONSI) and applicant prepared Environmental Assessment for the Malad City Wastewater Treatment System Improvements Project November 2023

The U.S. Army Corps of Engineers, Walla Walla District (USACE) has conducted an environmental analysis of the City of Malad, Idaho, Environmental Assessment (EA), dated May 2018. USACE will provide financial assistance under Section 595 of the Water Resources Development Act of 1999 to Malad City (City) to help with portions of their proposed action to make improvements to the wastewater treatment system. USACE contributions include: the removal of existing fences around the old treatment facility and the installation of a new chain link fencing and gates around the newly constructed treatment lagoons, construction assistance for the Precast (Operations) Building, funding for engineering technical assistance during construction, and for Davis-Bacon wage interviews and grant administration. No significant impacts to environmental resources were identified during the environmental analysis or public comment period, therefore an Environmental Impact Statement is not required. The FONSI was signed by the Walla Walla District Commander (Commander Kingslack) on October 27, 2023.

Final Environmental Assessment

Final signed FONSI

Notice of Availability of the Final Finding of No Significant Impact (FONSI) and Environmental Assessment for the Fort Hall Wastewater System Improvements Project October 2023​

The U.S. Army Corps of Engineers, Walla Walla District (USACE) has conducted an environmental analysis of the Fort Hall Wastewater System Improvements Project dated October 2023.  USACE will provide Section 595 assistance to the Shoshone-Bannock Tribes for upgrades to the Fort Hall wastewater system for two project elements (increments of work), out of fifteen improvements identified in a 2017 Wastewater Facilities Planning Study, specifically: (1) Old Housing Sewer Main Replacement and (2) Fort Hall Interceptor Main Replacement. Cost share assistance will be provided when funds are made available for that purpose. No significant impacts to environmental resources were identified during the environmental analysis or public comment period, therefore an Environmental Impact Statement is not required.  The FONSI was signed by the USACE Walla Walla District Commander (Commander KingSlack) on October 5, 2023.

Final FONSI

Final EA

The Yakima River Delta Ecosystem Restoration has its own webpage.

The Sweetwater Creek Ecosystem Restoration study has its own webpage.

The Garden City Flood Risk Management General Investigation (GI) Study has its own webpage. 

The Finding of No Significant Impact (FONSI), the environmental compliance decision document for the lower Snake River Navigation Channel Maintenance Environmental Assessment, was signed by the Walla District Commander (Commander KingSlack) on September 27, 2022.  Signing of the FONSI confirms that the Corps did not find any significant impacts to the environment associated with implementation of the dredging and disposal action.  The Corps’ contractor completed dredging on February 25, 2023.  Please see the links below to access the signed FONSI and attached Comment Response Document, the Environmental Assessment, and all supporting appendices.

2014 Programmatic Sediment Management Plan

Finding of No Significant Impact (FONSI)

Attachment to the FONSI - Comment Response Document

Environmental Assessment 

Appendix A: Current Immediate Need Navigation Channel Maintenance Dredging Monitoring Plan

Appendix B: Clean Water Act Section 404(b)(1) Evaluation

Appendix C: Hydraulic Evaluation of the Bishop Bar Disposal Site

Appendix D: Endangered Species Act Biological Assessment 

Appendix E: National Marine Fisheries Service Biological Opinion

Appendix F: U.S Fish and Wildlife Service Biological Opinion

Appendix G: Idaho SHPO NHPA Section 106 Concurrence Letter dated June 8, 2022

Appendix H: Washington SHPO NHPA Section 106 Concurrence Letter dated June 16, 2022

The Finding of No Significant Impact (FONSI) was signed by the Director of Civil Works on June 27, 2022 for the Federal Participation in Watercraft Inspection Stations, Updated Integrated Letter Report and Programmatic Environmental Assessment, Columbia River Basin (LR/PEA). In compliance with the National Environmental Policy Act, the Corps produced the Updated LR/PEA to evaluate the potential economic and environmental effects of including the states of Nevada and Wyoming in the current and successful federal cost-share program of establishing and maintaining watercraft inspection stations in the Columbia River Basin to help prevent the spread of aquatic invasive species, specifically zebra and quagga mussels. The current program is operated in Idaho, Montana, Oregon, and Washington. Expansion of the program to Nevada and Wyoming will help to prevent the spread of aquatic invasive species to reservoirs in the Columbia River Basin, operated by the U.S. Army Corps of Engineers.

• Signed FONSI for the Updated Integrated Letter Report and Programmatic EA_Federal Participation in Watercraft Inspection Stations CRB_June 2022
• Updated Integrated Letter Report and Programmatic EA_Federal Participation in Watercraft Inspection Stations CRB_May 2022
• App A_Final Biological Evaluation, Aquatic Invasive Species_Watercraft Inspection Stations_ID-MT-OR-WA_August 2016
• App B_ Pacific States Marine Fisheries Commission Letter of Intent and Non-Federal Sponsor’s Self-Certification of Financial Capability for Watercraft Inspection Program_February 2017
• App C_ Final Signed FONSI for the Final Integrated Letter Report and Programmatic EA, Federal Participation in Watercraft Inspection Stations, CRB_ID-MT-OR-WA_March 2017
• App D_ Final Integrated Letter Report and Programmatic EA, Federal Participation in Watercraft Inspection Stations, CRB_ID-MT-OR-WA_March 2017
• App E_Final Signed FONSI Dreissenid Mussel Rapid Response Action Plan Programmatic EA_ID-MT-OR-WA_November 2019
• App F_ Final Dreissenid Mussel Rapid Response Action Plan Programmatic EA_ID-MT-OR-WA_November 2019
• App G_ Final Aquatic Invasive Species Watercraft Inspection Stations Geographic Expansion to Include NV and WY, Federal Natural Resources Law Compliance and Biological Evaluation_ID-MT-NV-OR-WA-WY_June 2021
• App H_ Final FONSI for the Supplemental Programmatic EA, Supplement 1, Federal Participation in Watercraft Inspection Stations and Rapid Response Actions to Protect the CRB_NV-WY_May 2022
• App I_ Final Supplemental Programmatic EA, Supplement 1, Federal Participation in Watercraft Inspection Stations and Rapid Response Actions to Protect the CRB_NV-WY_July 2020
• App J_ Draft Dreissenid Rapid Response Action Plan, September 2021