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Regulatory Notices

6 Dec 2022
Notice of Availability of the Interim Draft of the National Ordinary High Water Mark Field Delineation Manual for Rivers and Streams

Expiration date: 12/6/2026
The U.S. Army Corps of Engineers (USACE) and EPA (the Agencies) jointly announce the availability of the Interim Draft of the National Ordinary High Water Mark Field Delineation Manual for Rivers and Streams (National OHWM Manual) and its accompanying data sheet.

Notice of Availability of the Interim Draft of the National Ordinary High Water Mark Field Delineation Manual for Rivers and Streams
25 Mar 2019
Notice of Change to Aquatic Resources Mitigation in Oregon
Joint Public NoticeNotice of Change to Aquatic Resources Mitigation in OregonThe Oregon Department
16 Jul 2018
Sediment Evaluation Framework for the Pacific Northwest (SEF)
Interested parties are hereby notified that the U.S. Army Corps of Engineers Northwestern Division (USACE) and the U.S. Environmental Protection Agency – Region 10 (EPA) have implemented the May 2018 Sediment Evaluation Framework for the Pacific Northwest (SEF). The Corps and EPA solicited public comments regarding updates to Chapters 3 and 10 of the July 2016 SEF from December 22, 2017 through February 20, 2018. No public comments were received. Updates to the SEF chapters were also presented at the Regional Sediment Evaluation Team’s (RSET’s) annual public web-meeting held on November 30, 2017.
16 Jul 2018
Sediment Evaluation Framework for the Pacific Northwest (SEF)
Notice: Interested parties are hereby notified that the U.S. Army Corps of Engineers Northwestern
29 Jun 2018
Notice of Stream Function Assessment Method for Oregon
The purpose of this notice is to make the public aware of SFAM and associated tools, explain the need for and development of the method, and to invite feedback from users.
29 Jun 2018
Notice of Stream Function Assessment Method for Oregon
The Oregon Department of State Lands (DSL), the U.S. Environmental Protection Agency, Region 10, and
9 Apr 2018
Compensatory mitigation for aquatic resource loss
The purpose of this notice is to inform the public that the U.S. Army Corps of Engineers, Portland District (USACE) may require additional compensatory mitigation for unavoidable impacts and permanent losses of certain waters of the United States. USACE has developed a list of Aquatic Resources of Special Concern (ARSC) to identify and define those aquatic resources that are unique, difficult to replace, and/or have high ecological function. The list of ARSC, with definitions, is attached.
9 Apr 2018
Compensatory mitigation for aquatic resource loss
The purpose of this notice is to inform the public that the U.S. Army Corps of Engineers, Portland District (Corps) may require additional compensatory mitigation for unavoidable impacts and permanent losses of certain waters of the United States. USACE has developed a list of Aquatic Resources of Special Concern (ARSC) to identify and define those aquatic resources that are unique, difficult to replace, and/or have high ecological function. The list of ARSC, with definitions, is attached.
9 Apr 2018
Compensatory mitigation for aquatic resource loss
Public NoticeCompensatory Mitigation Requirements for Unavoidable Losses Occurring in Aquatic