Belmont Lake Dam dam
Belmont Lake Dam
Belmont Lake Dam, located in North Babylon, Suffolk County, New York, is a state-regulated structure on the Carlls River, completed in 1905 for recreational purposes. This earth dam stands at a height of 9 feet and has a length of 1500 feet, providing a maximum storage capacity of 78 acre-feet with a normal storage level of 57 acre-feet. The dam has a surface area of 26 acres and serves a drainage area of 28.1 square miles.
With a low hazard potential and a moderate risk assessment rating, the condition of Belmont Lake Dam is currently not rated. The last inspection was conducted in May 2009, and regular state inspections, permitting, and enforcement are in place to ensure its safety and compliance. The dam features an uncontrolled spillway type and is primarily used for recreation, attracting water resource and climate enthusiasts to enjoy the surrounding area's natural beauty and ecosystem.
As a significant structure in the region, Belmont Lake Dam offers opportunities for outdoor activities while also serving as a vital component of the local water management system. Its historical significance, combined with its recreational and environmental value, makes it a noteworthy site for those interested in water resources and climate dynamics in Suffolk County, New York.
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 Belmont Lake Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Carlls River At Babylon Ny | 15 cfs | → |
| Sampawams Creek At Babylon Ny | 9 cfs | → |
| Massapequa Creek At Massapequa Ny | 2 cfs | → |
| Connetquot Bk Nr Central Islip Ny | 21 cfs | → |
| Nissequogue River Near Smithtown Ny | 31 cfs | → |
| Cold Spring Brook At Cold Spring Harbor Ny | 2 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Belmont Lake Dam.
Boat launches
- Scudder Park
- Long Island Greenbelt Trail Suffolk County
- Lake Ronkonkoma
- Asharoken Avenue Asharoken
- Lloyd Harbor Road 72, Lloyd Harbor
Campgrounds
- Park Shore Day Camp
- Battle Row
- Blydenburgh Park
- Watch Hill Campgrounds
- Cathedral Pines County Park
- Southaven County Park
Fishing spots
Track Belmont Lake 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 Belmont Lake Dam
Where does the data for Belmont Lake 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 Low 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 Belmont Lake Dam.