Grupes Reservoir Dam dam
Grupes Reservoir Dam
Grupes Reservoir Dam, located in Fairfield, Connecticut, is a pivotal structure managed by the local government for water supply purposes. Completed in 1871, this concrete dam stands at a height of 24 feet and has a length of 235 feet, providing a storage capacity of 311 acre-feet. The dam overlooks the scenic Silvermine River and serves as a vital resource for the surrounding community.
Despite its historical significance, Grupes Reservoir Dam faces challenges with a high hazard potential and poor condition assessment, highlighting the need for regular inspections and maintenance. The dam's spillway type is uncontrolled, with a spillway width of 49 feet, emphasizing the importance of effective risk management measures. With a moderate risk assessment rating of 3, efforts are underway to ensure the safety and functionality of this essential water infrastructure for the region.
As climate change impacts water resources, the resilience and sustainability of dams like Grupes Reservoir are crucial for mitigating risks and ensuring reliable water supply. The dam's location in New Canaan underscores its strategic importance in managing water resources and protecting against potential hazards. For water resource and climate enthusiasts, Grupes Reservoir Dam presents a compelling case study on the intersection of infrastructure, environmental stewardship, and community resilience in the face of evolving climate challenges.
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 Grupes Reservoir Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Fivemile River Near New Canaan | 0 cfs | → |
| Norwalk R At South Wilton | 10 cfs | → |
| Saugatuck R Nr Westport | 18 cfs | → |
| Cross River Near Cross River Ny | 8 cfs | → |
| Saugatuck River Near Redding | 6 cfs | → |
| Ridgefield Brook At Shields Lane Nr Ridgefield | 2 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Grupes Reservoir Dam.
Boat launches
- Saugatuck River
- Roosevelt Road Westport
- Hillspoint Road Westport
- Maple Way 10, Town Of North Castle
- Seagate Road 3, Greenwich
- Lake Kenosia
Campgrounds
- Ward Pound Ridge Reservation
- Mountain Lakes Park
- Youth Camp Ii
- Youth Camp Iii
- Youth Camp I
- Croton Point Park
Fishing spots
Paddle runs
- Kent Bridge To Boardman Bridge
- Pond Downstream Of Shepaug Reservoir Dam, Marked By Service Road Bridge To Ends In Backwaters Of Lake Lillinonah, Near Roxbury Falls
- Begins Downstream Of The Borough Of Bantam, At Stoddard Road Bridge To The Confluence With The Shepaug River
- Begins Below The Tailrace Of The Lower Collinsville Dam To The Route 187 Bridge
- 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
Track Grupes 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 Grupes Reservoir Dam
Where does the data for Grupes 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 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 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 Grupes Reservoir Dam.