The U.S. Army Corps of Engineers Districts within the State of Missouri
(Kansas City, Little Rock, Memphis, Rock Island, St. Louis) (Corps) adopted the Missouri Stream Mitigation Method (MSMM) on March 1, 2007, revised on May 29, 2013. The MSMM is the primary tool the Corps has used for the evaluation of stream impacts and mitigation proposals for Department of the Army permit actions within the State of Missouri. The September 2023 updated revision of the MSMM will enhance the Corps’ ability to protect the Nation’s aquatic resources, while allowing reasonable development through fair, flexible and balanced permit decisions. With this notice, the Corps is announcing the final September 2023 MSMM and will begin using it immediately subject to the transition provisions described below.
The Corps conducted a comprehensive review of the MSMM to address conformance with the 2008 Compensatory Mitigation Rule (see 33 CFR part 332), inconsistencies in the document and other issues identified during the first 15+ years of use. As part of this review, a public notice was issued on April 14, 2023, requesting public input on the draft revised MSMM. We evaluated all comments received and tested various agency and public recommendations in the development of this final version of the 2023 MSMM.