When the U.S. Army Corps of Engineers (Corps) reviews a project that requires Department of the Army authorization, our evaluation typically includes a determination of whether the applicant has taken sufficient measures to mitigate the project’s likely adverse impact on the aquatic ecosystem. Mitigation is a three-step sequential process:
Avoid: Take all appropriate and practicable measures to avoid those adverse impacts to the aquatic ecosystem that are not necessary.
Minimize: Take all appropriate and practicable measures to minimize those adverse impacts to the aquatic ecosystem that cannot reasonably be avoided.
Compensate: Implement appropriate and practicable measures to compensate for adverse project impacts to the aquatic ecosystem that cannot reasonably be avoided or further minimized. This step is also referred to as compensatory mitigation.
The Corps and the Environmental Protection Agency (EPA) issued regulations regarding mitigation on April 10, 2008. Compensatory Mitigation for Losses of Aquatic Resources (33 CFR 332), also known as the Final Rule, became effective on June 9, 2008. The Final Rule establishes standards and criteria for compensatory mitigation, including on-site and off-site permittee-responsible mitigation, mitigation banks, and in-lieu fee mitigation to offset losses associated with unavoidable impacts to waters of the United States authorized through the issuance of Department of the Army (DA) permits pursuant to section 404 of the Clean Water Act (33 U.S.C. 1344) and/or sections 9 or 10 of the Rivers and Harbors Act of 1899 (33 U.S.C. 401, 403).
The Final Rule states that a permit application must include a statement describing how impacts to waters of the United States (U.S.) are to be avoided and minimized. The application must also include either a statement describing how impacts to waters of the U.S. are to be compensated for or a statement explaining why compensatory mitigation should not be required for the proposed impacts (33 CFR 325.1).
Colorado Mitigation Procedures
On June 26, 2020, the Corps issued a public notice approving the Colorado Mitigation Procedures (COMP) v2. The COMP outlines basic regulatory process the Albuquerque, Omaha, and Sacramento Districts will follow to determine compensatory mitigation requirements, including the use of stream and wetland functional and condition assessments (FCAMs), within the State of Colorado. The COMP is also available on RIBITS under Colorado Assessment Tools.
COMP v1 Appendix A
Colorado Stream Quantification Tool (CSQT) v1.0
On September 29, 2020, the Corps issued a public notice approving the use of the Colorado Stream Quantification Tool (CSQT) v1. The CSQT is an FCAM that identifies a suite of stream functions and establishes standard operating procedures for collecting data on prospective stream impact and mitigation sites. The CSQT is an objective, measureable, and repeatable set of standard operating procedures based on quantitative data and field measurements that results in a functional foot score. The functional foot score will serve as a foundation to quantify changes in stream functions as a result of projects requiring permits under Section 404 of the Clean Water Act within the State of Colorado. The CSQT is also available on the RIBITS website under Colorado Assessment Tools, as well as the Stream Mechanics website.
CSQT v1 Spreadsheet
CSQT v1 Debit Calculator
CSQT v1 User Manual
CSQT v1 Forms (User Manual Appendices A and B)
CSQT v1 Science Support Documentation
Mitigation Ratio-Setting Checklist
The South Pacific Division Regulatory Program Standard Operating Procedure for Determination of Mitigation Ratios outlines the process for determining compensatory mitigation requirements as required for processing of Department of the Army (DA) permits under Section 404 of the Clean Water Act, Section 10 of the Rivers and Harbors Act, and Section 103 of the Marine Protection, Research, and Sanctuaries Act.
Instructions for the SOP for Determination of Mitigation Ratios
MRSC Checklist Examples
Mitigation Plan Requirements for Permits
For individual permits, the permittee must prepare a draft mitigation plan and submit it with the application for review. A final mitigation plan must be submitted to and approved by the USACE before an individual permit can be issued (33 CFR 332.4(c)).
For general permits, if compensatory mitigation is required, the USACE may approve a conceptual or detailed mitigation plan but a final mitigation plan must be approved before the permittee commences work in waters of the United States (33 CFR 332.4(c)).
Regional Compensatory Mitigation and Monitoring Guidelines
The South Pacific Division has published Regional Compensatory Mitigation and Monitoring Guidelines (Guidelines) to be followed in South Pacific Division’s subordinate districts (Albuquerque, San Francisco, Sacramento, and Los Angeles districts) regarding procedures for compensatory mitigation as required for processing of Department of the Army (DA) permits under Section 404 of the Clean Water Act, Section 10 of the Rivers and Harbors Act, and Section 103 of the Marine Protection, Research, and Sanctuaries Act. The Public Notice, including the Guidelines and Mitigation Monitoring Report Form, can be viewed at the link below:
Uniform Performance Standards
The Uniform Performance Standards include physical, hydrological, and biological metrics for use in determining interim and final mitigation success, as well as adaptive management measures. These performance standards are required as part of any mitigation plan. The USACE Project Manager will work with applicants and their consultants to assist in identifying applicable performance standards for mitigation sites.
To find Mitigation Banking information, click here to access the Regional In-lieu Fee and Banking Information Tracking System (RIBITS).
There are currently no Mitigation Banks in New Mexico or in the Albuquerque District's Area of Responsibility in Texas.
Mitigation Workshop Materials
The Regulatory Division held a workshop on March 12, 2015 on both the Regional Compensatory Mitigation and Monitoring Guidelines and the Mitigation Ratio-Setting Checklist. The presenations may be obtained by clicking on the links below:
Regional Compensatory Mitigation and Monitoring Guidelines Presentation
Mitigation Ratio-Setting Checklist Presentation