|- elevation||100 feet (30 m)|
|50 feet (15 m)|
|Length||11.5 miles (18.5 km)|
The Stillwater River is an 11.5-mile-long (18.5 km) side channel of the Penobscot River in Maine. From its source ( ) in Old Town, the Stillwater runs 2.3 miles (3.7 km) northwest along the northeast side of Orson Island, the site of the Penobscot Indian Reservation. It then runs 9.2 miles (14.8 km) south along the west sides of Orson and Marsh islands, over three dammed falls. The stream rejoins the main stem of the Penobscot in Orono.
- "Stillwater River". Geographic Names Information System. United States Geological Survey. 30 September 1980. Retrieved 2010-06-15.
- Maine Streamflow Data from the USGS
- Maine Watershed Data From Environmental Protection Agency
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