The Boyne City Mill Pond is not a true impoundment resulting from a dam on the river .
The Boyne City Mill Pond affects the river similarly in that itcollects sediments and provides a large surface area that tends to raise the water temperature during the summer months .
The Boyne City Mill Pond is not a true impoundment resulting from a dam on the river , but affects the river similarly in that itcollects sediments and provides a large surface area that tends to raise the water temperature during the summer months .