Answer: millpond

AnswerCrossword Clue
MILLPONDWaterwheel water source, perhaps
MILLPONDWheel-powering reservoir
MILLPONDIt's formed by damming a stream
MILLPONDWaterwheel source, perhaps
millpondpond for supplying water to drive a mill wheel
millponda pond for supplying water to run a mill wheel