Cold Brook Reservoir Dam dam
Cold Brook Reservoir Dam
Cold Brook Reservoir Dam, located in Glastonbury, Connecticut, is a vital part of the state's water supply infrastructure. Built in 1919, this earth dam stands at 13 feet high and spans 150 feet in length, with a storage capacity of 52 acre-feet. The reservoir serves as the primary source of water for the area, covering a surface area of 11 acres and draining a 7.48 square mile watershed.
State-regulated and inspected, Cold Brook Reservoir Dam is considered to have a significant hazard potential, although its condition assessment is rated as fair. With a spillway width of 60 feet and a maximum discharge capacity of 1085 cubic feet per second, the dam plays a crucial role in flood control and water management in the region. Despite being modified over the years, its risk assessment remains moderate, with emergency action plans and risk management measures in place to ensure public safety and environmental protection.
For water resource and climate enthusiasts, Cold Brook Reservoir Dam represents a remarkable engineering feat that continues to provide essential water supply services to the community. As a public utility structure under the oversight of the Department of Energy and Environmental Protection (DEEP), its history, design, and operational significance make it a noteworthy asset in Connecticut's water infrastructure network.
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 Cold Brook Reservoir Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Hockanum River Near East Hartford | 86 cfs | → |
| Connecticut R At Middle Haddam | 43,400 cfs | → |
| Salmon River Near East Hampton | 106 cfs | → |
| North Branch Park R At Hartford | 10 cfs | → |
| Coginchaug River At Middlefield | 18 cfs | → |
| Willimantic River Near Coventry | 211 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Cold Brook Reservoir Dam.
Boat launches
- New State Road Trail Manchester
- Main Street 204, Cromwell
- Wilbur Cross Highway East Hartford
- East River Drive East Hartford
- Holbrook Pond
- Bolton Lake (Lower)
Campgrounds
Fishing spots
- Great Brook Reservoir
- Lower Fulton Park Pond
- Toms Creek
- Lake Wintergreen
- Seymour Reservoir Number 4
- Reservoir Number 2
Paddle runs
- Begins Below The Tailrace Of The Rainbow Dam To The Confluence With The Connecticut River
- Begins Below The Tailrace Of The Lower Collinsville Dam To The Route 187 Bridge
- The Confluence Of The East And West Branches To The Confluence With The Farmington River In East Granby
- The Confluence With The Nepaug River To A Point 0.2 Miles Below The Lower Collinsville Dam Tailrace
- New Hartford/Canton Town Line To The Confluence With The Nepaug River
- The Hartland Headwaters To The Confluence With The Salmon Brook Main Stem
Track Cold Brook Reservoir Dam 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 Cold Brook Reservoir Dam
Where does the data for Cold Brook Reservoir Dam 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 Significant 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 Cold Brook Reservoir Dam.