Long Hill Reservoir Dam dam
Long Hill Reservoir Dam
Long Hill Reservoir Dam, also known as the New Naugatuck Reservoir, is a concrete dam located in Woodbridge, Connecticut. Built in 1914, this dam serves the primary purpose of water supply, with a storage capacity of 2148 acre-feet and a maximum discharge of 2130 cubic feet per second. The dam stands at a height of 80 feet and stretches 890 feet in length, impounding the Beacon Hill Brook to create a surface area of 87 acres.
Managed by the state agency DEEP, Long Hill Reservoir Dam is regularly inspected and maintained to ensure its structural integrity and the safety of the surrounding community. With a high hazard potential due to its location and the volume of water it holds, the dam's condition is assessed as satisfactory, with a moderate risk level. Emergency action plans are in place, although details on their last revision and adherence to guidelines are pending update.
For water resource and climate enthusiasts, Long Hill Reservoir Dam offers a fascinating glimpse into the intersection of human infrastructure and natural ecosystems. Its historical significance, engineering design, and regulatory oversight contribute to the ongoing dialogue around water management and dam safety in Connecticut, making it a noteworthy site for further exploration and study in the field.
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 Long Hill Reservoir Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Naugatuck River At Beacon Falls | 657 cfs | → |
| Mill R Nr Hamden | 54 cfs | → |
| Quinnipiac River At Wallingford | 297 cfs | → |
| Quinnipiac River At Southington | 33 cfs | → |
| Housatonic River At Stevenson | 495 cfs | → |
| Pomperaug River At Southbury | 121 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Long Hill Reservoir Dam.
Boat launches
- Main Street Hamden
- Sackett Point Road North Haven
- North Farms Reservoir
- Lake Housatonic
- Quinnipiac River Front St Boat Ramp
- Lake Plymouth Boulevard 191, Plymouth
Campgrounds
Fishing spots
- Seymour Reservoir Number 4
- Reservoir Number 2
- Reservoir Number 1
- Seymour Reservoir Number 2
- Seymour Reservoir Number 1
- Carrington Pond
Paddle runs
- 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
- Pond Downstream Of Shepaug Reservoir Dam, Marked By Service Road Bridge To Ends In Backwaters Of Lake Lillinonah, Near Roxbury Falls
- 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
- Kent Bridge To Boardman Bridge
Track Long Hill 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 Long Hill Reservoir Dam
Where does the data for Long Hill 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 Long Hill Reservoir Dam.