Millhurst Lake Dam dam
Millhurst Lake Dam
Millhurst Lake Dam, located in Jamesburg, Monmouth County, New Jersey, is a local government-owned structure designed for recreational purposes. Built in 1915, this earth dam spans 270 feet in length and stands at a height of 23.4 feet, impounding the waters of Manalapan Brook to create Millhurst Lake with a storage capacity of 843 acre-feet. The dam's primary purpose is to provide recreational opportunities for the community, offering a surface area of 25 acres for various water-based activities.
Managed by the New Jersey Department of Environmental Protection, Millhurst Lake Dam is regulated, permitted, inspected, and enforced by state authorities to ensure its safety and compliance with standards. The dam's last inspection in June 2021 deemed its condition satisfactory, with a high hazard potential due to its location and storage capacity. While an Emergency Action Plan has not been prepared, the dam meets guidelines for risk assessment and management, although specific measures are not detailed in the available data. With its rich history and crucial role in providing recreational opportunities in the region, Millhurst Lake Dam serves as a reminder of the importance of water resource management and climate resilience in maintaining safe and enjoyable environments for communities to thrive.
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 Millhurst Lake Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Big Brook Near Marlboro Nj | 4 cfs | → |
| Manalapan Brook At Spotswood Nj | 17 cfs | → |
| Deep Run At Old Bridge Nj | 3 cfs | → |
| Manasquan River At Squankum Nj | 27 cfs | → |
| Swimming River Near Red Bank Nj | 4 cfs | → |
| Manasquan R Nr Allenwood Nj | 12 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Millhurst Lake Dam.
Boat launches
- Ravine Drive Matawan
- Middlesex County
- River Road Sayreville
- Raritan Reach Road 28, South Amboy
- Riverview Avenue Little Silver
- South 3rd Avenue Highland Park
Track Millhurst 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 Millhurst Lake Dam
Where does the data for Millhurst 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 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 Millhurst Lake Dam.