Nepaug East Dike dam
Nepaug East Dike
Nepaug East Dike, also known as Nepaug Reservoir, is a concrete dam located in Collinsville, Connecticut. Built in 1916, this structure serves a primary purpose of water supply, with a storage capacity of 40,540 acre-feet and a normal storage level of 29,300 acre-feet. The dam stands at a height of 30 feet and spans a length of 700 feet, creating a reservoir with a surface area of 850 acres and draining a watershed area of 31.9 square miles.
Managed by the Connecticut Department of Energy and Environmental Protection (DEEP), Nepaug East Dike is a critical infrastructure for water resource management in the region. The dam has a high hazard potential and is inspected every two years to ensure its satisfactory condition and compliance with regulatory standards. Its associated structures include CT00370 and CT00370S02, with the last inspection conducted in August 2019.
Located on the Nepaug River, Nepaug East Dike plays a vital role in supplying water to the surrounding communities while also mitigating flood risks and ensuring water resource sustainability. As a key component of Connecticut's water infrastructure, this dam exemplifies the importance of proactive management and maintenance to safeguard both water resources and the environment in the face of changing climate conditions.
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 Nepaug East Dike -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Burlington Brook Near Burlington | 4 cfs | → |
| Farmington River At Unionville | 259 cfs | → |
| West Branch Farmington River At Riverton | 129 cfs | → |
| Farmington River At Tariffville | 410 cfs | → |
| Still River At Robertsville | 50 cfs | → |
| North Branch Park R At Hartford | 11 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Nepaug East Dike.
Boat launches
- Farmington River Trail Collinsville
- Riverside Road Simsbury
- West Hill Pond Boat Launch
- Burr Pond
- Highland Lake
- Batterson Park Pond
Campgrounds
- Deep Campsite
- Camp Sequassen
- Camp Workcoeman
- James Stocking Youth Group Camping Area
- Haws Memorial - American Legion State Forest
- Roaring Brook Camp Area
Fishing spots
- Great Brook Reservoir
- Lower Fulton Park Pond
- Lake Quassapaug
- Seymour Reservoir Number 4
- Reservoir Number 2
- Seymour Reservoir Number 2
Paddle runs
- 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
- Begins Below The Tailrace Of The Lower Collinsville Dam To The Route 187 Bridge
- The Hartland Headwaters To The Confluence With The Salmon Brook Main Stem
- The Confluence Of The East And West Branches To The Confluence With The Farmington River In East Granby
- Begins Below The Tailrace Of The Rainbow Dam To The Confluence With The Connecticut River
Track Nepaug East Dike 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 Nepaug East Dike
Where does the data for Nepaug East Dike 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 Nepaug East Dike.