Field Notes
U.S. Fish & Wildlife Service
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Columbia Field Office Completes Biological Opinion for Bagnell DamWrapping Up a 6-year Relicensing Process.
Midwest Region, September 19, 2006
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Bagnell Dam separating the Osage River (foreground) and Lake of the Ozarks (background) 
- FWS photo
Bagnell Dam separating the Osage River (foreground) and Lake of the Ozarks (background)

- FWS photo

- Photo Credit: n/a

A Biological Opinion was recently completed by the Columbia Ecological Services Field Office, Missouri, on the federally endangered pink mucket and scaleshell mussels for the relicensing of Bagnell Dam, located on the Osage River in central Missouri.  

The Endangered Species Act consultation, and relicensing process leading up to the Biological Opinion, resulted in the development of several significant environmental improvements for the Osage River that will greatly reduce impacts of this hydroelectric operation on downstream aquatic species.  

The most notable changes involve the overall flow regime and quality of the release water.  Base flow will be substantially increased and daily and seasonal flow patterns will more closely resemble a natural stream, stimulating the reproduction of fish and mussel populations.  

Turbine upgrades and other operational changes will increase the dissolved oxygen in the Osage River below the dam to a level safe for aquatic life.  Dissolved oxygen levels currently drop to near zero during summer power generation.  Additionally, annual funding will be provided to help further restore mussel populations and habitat in the Osage River for the next 40 years. 

These conservation measures were developed while maintaining project purposes and protecting critical lake levels for recreation on Lake of the Ozarks.  

Contact Info: Larry Dean, 612-713-5312, Larry_Dean@fws.gov
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