The Wicomico River is a 13.0-mile-long tributary of the lower tidal portion of the Potomac River located in the U.S. state of Maryland south of Washington, DC. The river empties into the Potomac at Cobb Island and St. Margaret's Island. Its watershed area is 77 square miles, with 2% impervious surface in 1994 in Charles, St. Mary's, and southern Princ…The Wicomico River is a 13.0-mile-long tributary of the lower tidal portion of the Potomac River located in the U.S. state of Maryland south of Washington, DC. The river empties into the Potomac at Cobb Island and St. Margaret's Island. Its watershed area is 77 square miles, with 2% impervious surface in 1994 in Charles, St. Mary's, and southern Prince George's counties. The lower section of the river forms part of the boundary between Charles and St. Mary's counties. The Wicomico River was designated a Scenic River under the Maryland Scenic River Act in 1968. Scenic River Commissions oversee it in Charles and St. Mary's counties..
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