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Analysis of water level elevations and discharges was performed for Pool 25 on the Upper Mississippi River as part of a study to increase ecological benefits of the operation of Lock and Dam 25. This dam was placed in operation in May 1939. Since that time, the operating plan for managing water levels has undergone several changes. Discharges for Pool 25 were estimated using data from the closest gaging stations, with corrections accounting for changes in watershed area. Discharge estimates since 1939 were used to compute exceedence frequencies on a weekly, monthly, and yearly basis. They were also used to calculate the percentage of time discharges were within specified ranges for the three time scales. Water level measurements at [...]


(other) :
Joseph H Wlosinski


Spatial Services

ScienceBase WMS


  • Upper Midwest Environmental Sciences Center (UMESC)



Data source
Input directly
National Biological Service, Environmental Management Technical Center, Onalaska, Wisconsin

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