Minnesota: Taking Stock of Locks

From September, 1996 (Update #28)

Seventeen of 19 locks and dams extending from Minneapolis, Minn., to Muscatine, Iowa, were colonized by zebra mussels in 1995, according to a collaborative survey conducted by the National Biological Survey's Greg Cope and the U.S. Army Corps of Engineers. Monitoring began June 1, 1995, and concluded in mid-October. Colonization did not occur at the upper and lower St. Anthony Dams in Minneapolis - dams that prohibit upstream commercial and recreational boating traffic. Very low colonization was found at lock and dam facilities between St.Paul and Red Wing, Minn. Colonization gradually increased from Lock and Dam 4 at Alma, Wis., to Lock and Dam 13 at Fulton, Ill., where the greatest densities were found (11,432 per square meter). Colonization densities decreased downstream from Fulton. Doug Jensen, Minnesota Sea Grant.

ID: 199609-11.

The Zebra Mussel Update was a 4- to 8-page quarterly national newsletter published by the University of Wisconsin Sea Grant Institute from May 1990 through May 1997. The ZMU documented the spread of the zebra mussel -- an exotic nuisance mussel -- through North America's freshwater environments, especially the Great Lakes, and on efforts to control it.