Accession Number : ADA140425

Title :   Final Environmental Impact Statement (As Amended 18 January 1972) Minnesota River, Minnesota, Mankato-North Mankato-Le Hillier. Flood Control. Phase I. Final Supplement II-A.

Descriptive Note : Final rept.


PDF Url : ADA140425

Report Date : Oct 1982

Pagination or Media Count : 111

Abstract : The St. Paul District, Corps of Engineers is currently construction flood control works on the Minnesota and Blue Earth Rivers to protect developed portions of the floodplain in Mankato, North Mankato and Le Hillier from frequent flood damage. These works include raising bridges to clear the high water of the standard project flood. The two Trunk Highway 169/60 bridges over the Blue Earth River must be raised or replaced to an elevation approximately 17 feet above the existing bridges, necessitating extensive work on the approaches to the bridges as well. Of the seven planes considered, two were selected for detailed study: Plans 1B and 1C. Except for small locational differences, the two alternative plans are similar. Both propose that one new bridge be built immediately upstream of the existing bridges and that a northbound off-ramp and a southbound on-ramp built to replace an existing at-grade intersection. Plan 1B would require slightly less property acquisition, while Plan 1C would provide better operation. Plan 1C is recommended because it better addresses identified public concerns and it makes net positive contributions to the goals of National Economic Development and Environmental Quality.

Descriptors :   *Flood control, Minnesota, Urban areas, Bridges, Roads, Modification, Environmental impact statements

Subject Categories : Civil Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE