Reducing Ice Formation at Navigation Dams

by Henry W. Harich, Chf., Reservoir Regulating Section; Corps of Engineers, St. Paul District, St. Paul, MN,


Serial Information: Journal of the Waterways, Harbors and Coastal Engineering Division, 1972, Vol. 98, Issue 3, Pg. 343-355


Document Type: Journal Paper

Abstract: Increasing the turbulence at the movable gates of the Mississippi River Navigation Dams in the St. Paul District by discharging over bulkheads during the winter rather than under the gates has prevented severe icing at the dam. This study has shown that movement of the gates has been facilitated substantially, but maintenance costs on the bulkheads have increased. Providing aeration facilities culverts through the earth dams and slots through emergency spillways, have increased dissolved oxygen in downstream slackwaters and have benefited fish life by reducing stagnation. Additional aeration is possible by improving facilitations.

Subject Headings: Navigation dams | Ice | Navigation (geomatic) | Bulkheads | Dissolved oxygen | Earthfill dams | Gates (hydraulic) | Rivers and streams | Aeration | Turbulence | Mississippi River

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