It originates in Raritan Township on the Hunterdon Plateau and flows through Croton and Locktown before cascading off the Plateau where it passes under the Green Sergeant's Covered Bridge, the last remaining covered bridge in the state and cutting through Amwell Valley to the Delaware River. Turning south, it cuts through a low ridge, is joined by Plum Brook and cuts through a second, slightly larger ridge to the west of Sergeantsville. It reaches the Delaware and Raritan Canal and the Delaware River at Prallsville.
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