John's Lake Dam dam
John's Lake Dam
John's Lake Dam, located in Wantage Township, Sussex, New Jersey, is a private dam regulated by the New Jersey Department of Environmental Protection. The dam, primarily used for recreation, stands at a height of 11 feet and spans 1200 feet in length, with a storage capacity of 150 acre-feet. Situated on Clove Brook, the dam poses a low hazard potential and is deemed to be in satisfactory condition as of its last inspection in October 2018.
Despite its private ownership, John's Lake Dam falls under state jurisdiction and is subject to state permitting, inspection, and enforcement. The dam's purpose of recreation is reflected in its minimal associated structures and its location in a scenic area popular for outdoor activities. With a drainage area of 2.3 square miles and a surface area of 2 acres, the dam serves as both a water resource and a recreational asset for the community.
Managed by local authorities, John's Lake Dam has not undergone significant modifications since its completion, and its emergency action plan status remains unspecified. With its low risk profile and satisfactory condition assessment, the dam continues to provide a safe and enjoyable environment for water resource and climate enthusiasts in the region.
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 John's Lake Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Delaware River At Port Jervis Ny | 5,390 cfs | → |
| Delaware River At Montague Nj | 6,170 cfs | → |
| Neversink River At Godeffroy Ny | 386 cfs | → |
| Mongaup River Near Mongaup Ny | 217 cfs | → |
| Eb Paulins Kill Near Lafayette Nj | 12 cfs | → |
| Shohola Creek Near Walker Lake | 69 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near John's Lake Dam.
Boat launches
- Winding Waters Trail Town Of Warwick
- Matamoras
- Butler Court Town Of Mamakating
- Otter Lane 101, Dingman Township
- Town Of Mamakating
- Sunrise Drive 299, Dingman Township
Track John's 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 John's Lake Dam
Where does the data for John's 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 John's Lake Dam.