Colby Mills dam
Colby Mills
Colby Mills, located in Lincoln County, Maine, is a private hydroelectric dam on Lovejoy Stream that has been serving its purpose since 1825. With a height of 16 feet and a hydraulic height of 12 feet, this concrete dam boasts a structural height of 16 feet and a length of 160 feet. Despite its age, Colby Mills has a low hazard potential and has not been rated for its condition as of its last inspection in March 2019.
Managed by the Maine Emergency Management Agency (MEMA), Colby Mills is regulated by the state and undergoes regular inspections, permitting, and enforcement to ensure its safety and compliance with regulations. The dam provides flood risk reduction, hydroelectric power generation, and serves other purposes as well. With a storage capacity of 1,934 acre-feet and a normal storage capacity of 1,158 acre-feet, Colby Mills covers a surface area of 193 acres. The dam's spillway width is 11 feet, further enhancing its ability to manage water flow effectively.
Despite its age and historical significance, Colby Mills continues to play a vital role in the local water resource management and climate resilience efforts. With its low hazard potential and commitment to meeting regulatory standards, this hydroelectric dam remains a key asset in the sustainable development of the region.
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 Colby Mills -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Sheepscot River At North Whitefield | 312 cfs | → |
| Kennebec River At North Sidney | 8,390 cfs | → |
| Cobbosseecontee Stream At Gardiner | 726 cfs | → |
| Ducktrap River Near Lincolnville | 25 cfs | → |
| Sandy River Near Mercer | 1,000 cfs | → |
| Nezinscot River At Turner Center | 43 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Colby Mills.
Track Colby Mills 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 Colby Mills
Where does the data for Colby Mills 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 Colby Mills.