The Ashuelot River in New Hampshire, the Farmington River in Connecticut, and the Neversink River in New York harbor large populations, but these number in the thousands only.
This occurred most recently in April 2005, causing some destruction and dislocation in the Port Jervis area, particularly the Myers Grove community near Huguenot, that continues to have an effect.
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Surveys conducted at two sites on the Neversink River below a dam in Cuddebackville, New York, derived abundance estimates ranging from 60 to 500 dwarf wedgemussels per site (Cole et al. 2004) prior to 2005.