Stillwater dam
Stillwater
Stillwater, located in Orono, Maine, is a privately owned concrete gravity dam on the Stillwater River that was completed in 1902 for hydroelectric power generation and recreation purposes. With a height of 25 feet and a length of 1720 feet, Stillwater has a storage capacity of 1910 acre-feet and serves a drainage area of 7602 square miles. The dam's spillway, which is uncontrolled, has a width of 908 feet and a maximum discharge of 25000 cubic feet per second.
Despite its age, Stillwater has a low hazard potential and a moderate risk assessment rating of 3. It is regulated by the Federal Energy Regulatory Commission, which also oversees its inspections. The dam's emergency action plan was last revised in December 2018, ensuring that necessary measures are in place in case of emergencies. While the condition assessment of Stillwater is not available, its overall risk management measures are deemed sufficient for its continued operation. For water resource and climate enthusiasts, Stillwater serves as a historical and functional example of sustainable hydroelectric infrastructure in the New England District.
Dam data reference
Condition Assessment
- Satisfactory
- No existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
- Fair
- No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action.
- Poor
- A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency.
- Unsatisfactory
- A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
- Not Rated
- The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Hazard Potential Classification
- High
- Dams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
- Significant
- Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environmental damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
- Low
- Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
- Undetermined
- Dams for which a downstream hazard potential has not been designated or is not provided.
Plan around the weather
Same NOAA / yr.no feed Snoflo's iOS app uses. Watch the precipitation column on the meteogram -- rain on the basin upstream typically lifts inflow 24-72 hours later.
Next 5 days, hour by hour
Temperature line with weather symbols on top, snow + rain accumulation as columns, humidity as a dotted line.
5-day forecast table
Every 3 hours, broken out across temperature, snow, rain, humidity, and wind. Each cell is colour-coded relative to the column min/max.
| Time | Condition | Temp (°F) | Snow (in) | Rain (in) | Humidity (%) | Wind (mps) | Wind dir |
|---|---|---|---|---|---|---|---|
| Loading detailed forecast… | |||||||
15-day temperature & precipitation
Daily temperatures, snow, and rain projected over the next two weeks.
Nearby streamflow gauges
USGS streamgauges around Stillwater -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Kenduskeag Stream Near Bangor | 344 cfs | → |
| Penobscot River At West Enfield | 17,100 cfs | → |
| Piscataquis River At Medford | 2,970 cfs | → |
| West Br Bear Brook Near Beddington | 1 cfs | → |
| East Br Bear Brook Near Beddington | 0 cfs | → |
| Piscataquis River Near Dover-Foxcroft | 597 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Stillwater .
Boat launches
- Fourth Street 22, Old Town
- Greenbush
- Camp Roosevelt Road 18, Clifton
- Snowmobile Trail 7c Holden Holden
- Craig Pond Trail 79, Orland
- Acadia Highway 1117, East Orland
Campgrounds
- Cold River Campground
- Paul Bunyan Campground
- Star Rock Campsite
- Great Pond Military
- Balsam Cove Campground
More reservoirs
Track Stillwater in the Snoflo app
Save this dam as a favorite and get the local NOAA / yr.no forecast plus regional flow context wherever you are.
About Stillwater
Where does the data for Stillwater come from?
Structural and regulatory data come from the U.S. Army Corps of Engineers' National Inventory of Dams (NID). Weather forecast comes from NOAA / yr.no -- the same feed Snoflo's iOS app uses.
How often is the report updated?
NID structural data refreshes annually as the Corps publishes updated assessments. The weather forecast refreshes throughout the day.
What does the Low hazard rating mean?
The Corps of Engineers' hazard potential classification grades probable consequences if the dam fails: High = probable loss of human life; Significant = no probable loss of human life but possible economic loss / environmental damage; Low = no probable loss of human life, only minor economic / environmental losses. See the Dam Data Reference card above for the full definitions.
What's "% of normal"?
The current storage value compared to the historical average storage on this calendar day. 100% = right on average; values above 100% mean above-normal storage (wet year); values below mean below-normal (dry year or drought).
Can I get alerts when storage crosses a threshold?
Yes -- alerts are managed in the Snoflo iOS app. Favorite this dam, set a threshold, and you'll get a push the moment conditions cross.
Other water bodies near here
Snoflo-tracked reservoirs and dams within driving distance of Stillwater .