French Lake Dam dam
French Lake Dam
French Lake Dam, located in Johnsonburg, New Jersey, is a privately owned earth dam completed in 1945 for recreational purposes along Bear Brook-TR. Standing at a height of 10 feet and with a length of 440 feet, the dam holds a storage capacity of 138 acre-feet with a surface area of 23 acres. Despite its low hazard potential, the dam is regulated by the New Jersey Department of Environmental Protection, ensuring regular inspections and enforcement to maintain its structural integrity.
The dam, nestled in Frelinghuysen Township, is a popular spot for outdoor enthusiasts seeking recreational activities such as fishing and boating. With a maximum discharge capacity of 370 cubic feet per second, the dam also plays a crucial role in managing water flow and ensuring the safety of downstream areas. Despite its age, the dam's condition assessment remains unrated, highlighting the need for ongoing monitoring and potentially an Emergency Action Plan to address any unforeseen risks or emergencies.
Overall, French Lake Dam serves as a vital resource for both water management and recreational enjoyment in Warren County, New Jersey. Its historical significance, combined with its functionality and scenic surroundings, make it a key feature of the local landscape that warrants continued attention and stewardship from both private owners and regulatory agencies to ensure its long-term sustainability and safety for all who benefit from its presence.
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 French Lake Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Paulins Kill At Blairstown Nj | 44 cfs | → |
| Pequest River At Huntsville Nj | 10 cfs | → |
| Yards Creek Near Blairstown Nj | 1 cfs | → |
| Pequest River At Pequest Nj | 49 cfs | → |
| Flat Brook Near Flatbrookville Nj | 38 cfs | → |
| Beaver Brook Near Belvidere Nj | 14 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near French Lake Dam.
Boat launches
- West Shore Drive Stillwater Township
- Poxono Access Area In Nj
- Jefferson Lake Road Sussex County
- Dell Avenue 9, Netcong
- Mcdade Recreational Trail Delaware
- Kittatinny Access Area
Track French 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 French Lake Dam
Where does the data for French 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 French Lake Dam.