Status Elsewhere

From September 17, 1990 (update #4)

CHICAGO - A single zebra mussel was found by commercial diver Ron Clark during an inspection of the Acme Steel pumphouse in late August. The Acme Steel facility is located on the Calumet River near the Illinois- Indiana border - about one mile upstream from its mouth on Lake Michigan. This industrial stretch of the river connects to the Cal-Sag Channel and Illinois River, which serves as the passage for commercial boat traffic between the Great Lakes and the Mississippi River.

EAST CHICAGO, Ind. - Extensive surveys of Inland Steel Company water intakes continue to show zebra mussels at several locations, according to commercial diver Ron Clark. These surveys confirm earlier observations made in mid-July of a zebra mussel infestation at this facility. Most of these mussels are 1/2"-3/4" long, and they have not been found at densities that could restrict water flow through these intakes.

BURNS HARBOR, Ind. - Adult zebra mussels were found in the water intake of the Bethle-hem Steel mill during early August, according to a report in the News-Dispatch. Inspections of intakes at the Michigan City, Ind., water utility and Midwest Steel intake at Portage, Ind., showed no signs of mussels, the newspaper said.

PICTON, Ont. - Veligers were found among plankton sampled at 2 meters below the surface at three out of 23 locations on Lake Ontario during June and July, according to Ted Shaner of the Ontario Ministry of Natural Resources. The veligers were detected at Niagara-on-the-Lake and Port Weller, both at the west end of the lake near the Niagara River outflow from Lake Erie, and at Main Duck Island near the east end of the lake. As of late July, however, no mussels had been found attached to substrate samplers, Shaner reported. Adult zebra mussels were found during a spring diving survey at four locations in Lake Ontario - at Niagara-on-the-Lake, Hamilton and Port Credit at the west end of the lake, and at Picton in the Bay of Quinte.

ID: 19900917-3.

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.