The only impoundment created by a hydroelectric facility in the upper subbasin is Mirror Pond on the Deschutes River within the City of Bend. Mirror Pond has become one of the primary attractions of Bend as a park for a variety of recreation and local events.
However, this impoundment has created a settling basin for sediment being carried in the river and has been dredged on one occasion at a high cost both in dollars and environment disruption of the stream channel. A smaller impoundment created by the North Canal dam downstream of Mirror Pond has also created a settling basin for sediment and loss of the natural stream channel (ODFW 1996d).
Full Document: Deschutes River Subbasin Draft