Dreissena polymorpha
•First live mussel collected from Missouri River near Sioux City, Iowa in 1999
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•Discovered in the Zumbro River in Minnesota in 2000
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•Four lakes in Pennsylvania, spanning the state from west to east in 2000-2001
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•Found in a quarry used for recreational diving in Virginia in 2002, a first for the state
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•Zebra mussels have been detected in over 336 small lakes independent of the large river impoundments
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•The number of infested lakes Michigan, Wisconsin, Ohio, Indiana, and New York continue to increase
USGS
What has the zebra mussel been up to over the last few years?  The first live mussel was collected by an Energy Corporation on a intake traveling screen, very close to where barge traffic flows.  The Minnesota DNR reported zms from Lake Zumbro, still the only lake in Minnesota with zms. In PA there are 3 lakes in the NW corner of the state (Edinboro which did a winter drawdown that was not very successful, Sandy Lake, Canadohta Lake, Dutch Springs Reservoir (east) which may have had both zebras and quaggas).  In VA a recreational diver who happened to be a NOAA employee discovered the zms in Millbrook Quarry, not too far from Washington DC. The quarry is near a large reservoir used as a city’s water supply. The Corps of Engineers reported last week a new infestation in Oolagah Lake on the upper Verdigris River in Oklahoma.  The yellow stars on the map represent the overland transport of boats found to have zebra mussels on their hulls.  In small lakes not including impoundments on large infested rivers, zebra mussels continue to spread.  I have compiled a list of at least 336 lake where zms have been detected but not necessarily become established.