Lake Wintergreen Dam dam
Lake Wintergreen Dam
Lake Wintergreen Dam, located in New Haven, Connecticut, is a historic masonry dam completed in 1863 for water supply purposes. With a height of 31 feet and a length of 900 feet, the dam has a storage capacity of 540 acre-feet and serves as a vital resource for the surrounding area. Managed by the Connecticut Department of Energy and Environmental Protection (DEEP), the dam is inspected regularly to ensure its structural integrity and maintain its satisfactory condition.
The dam's primary purpose is to provide water supply, drawing from Wintergreen Brook and covering a surface area of 43.5 acres. With a high hazard potential due to its location, Lake Wintergreen Dam has a maximum discharge capacity of 850 cubic feet per second and a spillway width of 50 feet. Despite its age, the dam continues to meet regulatory standards and is equipped to handle emergency situations, with an established Emergency Action Plan (EAP) updated as recently as 2016.
Lake Wintergreen Dam is not only a functional structure but also a historical landmark, serving as a testament to the engineering achievements of the past. Its importance in providing water resources to the community and its ongoing maintenance efforts reflect a commitment to preserving both the environment and the infrastructure for future generations. For water resource and climate enthusiasts, Lake Wintergreen Dam stands as a reminder of the critical role dams play in sustaining our ecosystems and communities.
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 Lake Wintergreen Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Mill R Nr Hamden | 17 cfs | → |
| Naugatuck River At Beacon Falls | 120 cfs | → |
| Quinnipiac River At Wallingford | 76 cfs | → |
| Housatonic River At Stevenson | 459 cfs | → |
| Pomperaug River At Southbury | 32 cfs | → |
| Pootatuck R At Sandy Hook | 15 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Lake Wintergreen Dam.
Boat launches
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Campgrounds
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Fishing spots
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River runs
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About Lake Wintergreen Dam
Where does the data for Lake Wintergreen 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 High 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 below 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.
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.