Stillwater
Stillwater is a concrete dam located in Penobscot County, Maine, built in 1902. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Stillwater
The primary purpose of Stillwater is hydroelectric. The dam generates hydroelectric power by channeling water through turbines, converting the energy of flowing water into electricity. The dam is owned by Black Bear Hydro Partners, Llc, Black Bear Development Holdings, Llc & Black Bear So, Llc (private). It impounds the Stillwater River near Orono.
The dam stands 25 feet tall and stretches 1,720 feet across, creates a reservoir covering 191 acres, has a maximum storage capacity of 1,910 acre-feet, and collects water from a drainage area of 7,602 square miles. Completed in 1902, the structure is over a century old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 09/14/2022.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Maine |
| County | Penobscot |
| Nearest City | Orono |
| River/Stream | Stillwater River |
| Coordinates | 44.90953, -68.68305 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 25 ft |
| Dam Height | 25 ft |
| Dam Length | 1,720 ft |
| Year Completed | 1902 (124 years old) |
Storage & Hydraulics
| NID Storage | 1,910 acre-ft |
| Max Storage | 1,910 acre-ft |
| Normal Storage | 1,910 acre-ft |
| Surface Area | 191 acres |
| Drainage Area | 7,602 sq mi |
| Max Discharge | 25,000 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | Black Bear Hydro Partners, LLC, Black Bear Development Holdings, LLC & Black Bear SO, LLC |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 09/14/2022 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | ME00139 |
| Federal ID | ME00139 |
| More Info | State Dam Safety Program |