Null Findings

From August 8, 1990 (update #3)

CHICAGO - Despite their presence in nearby waters, zebra mussels apparently have not yet infested the lake intakes of the Chicago public water utility, which treats about one billion gallons of water daily. Deputy Commissioner of Water Operations Joseph Szawica said on July 30 that no signs of the mussels were found during recent inspections of the utility's filtration plants. Meanwhile, Szawica said, the utility is examining options for keeping mussels out of its intakes - one located at a crib 2.5 miles off the Chicago lakefront and the other near shore.

ESCANABA, Mich. - Becher-Hoppe Service Corp. reported that it found no zebra mussels in a recent inspection of the 20-inch municipal water intake for Escanaba, located on the north end of Green Bay, Lake Michigan. The inspection was conducted with a camcorder mounted in a protective vehicle that was pulled through the pipeline.

CHARLEVOIX, Mich. - No zebra mussels were found during the U.S. Coast Guard's recent routine servicing of all its buoys in Lake Michigan - including Green Bay, Grand Traverse Bay and the western half of the Straits of Mackinac. The Coast Guard will be looking for zebra mussels again this fall when they begin decommissioning lighted buoys in late November, according to Lt. Cmdr. J.M. Dwyer.

ID: 19900808-4.

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.