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This is a natural ledge drop on the Presumpscot River just upstream of the bridge
above the Cumberland Mills Dam and the SAPPI mill in downtown Westbrook.

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In this photo, the river is at its natural elevation and channel size.

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The river level with the Cumberland Mills Dam at full pond level can be seen by the exposed sand banks near the red pick-up truck. The ledge formation is normally flooded when the Cumberland Mills Dam is at full pond level.

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This ledge drop forms the top of Ammoncongin Falls, now obscured by the Cumberland Mills Dam and the SAPPI mill facility, which the Presumpscot River flows under.

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Because this ledge outcrop stretches across the river channel, it acts as a hydraulic control for the river level above this location, and prevents the water level upstream from dropping any farther than shown above.

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