Cobbs Mill Dam dam
Cobbs Mill Dam
Cobbs Mill Dam, located in Alloway Township, New Jersey, is a privately owned structure built in 1940 primarily for recreational purposes along the Deep Run river. This earth dam stands at a height of 9.5 feet and has a length of 275 feet, creating a reservoir with a normal storage capacity of 29 acre-feet. Despite its age, the dam is in poor condition with a significant hazard potential, as indicated by the last inspection in March 2020.
Managed by the New Jersey Department of Environmental Protection, Cobbs Mill Dam is subject to state regulation, permitting, inspection, and enforcement. The dam poses a potential risk to surrounding areas in the event of a structural failure, highlighting the importance of ongoing maintenance and risk management measures. With a condition assessment rating of poor, there is a clear need for attention and potential upgrades to ensure the safety and integrity of this recreational structure for water resource and climate enthusiasts who frequent the area.
As climate change continues to impact water resources and infrastructure, the significance of maintaining and assessing dams like Cobbs Mill becomes increasingly critical. With its location in a congressional district represented by Jeff Van Drew, the dam's condition and potential risks should be closely monitored and addressed to mitigate any potential threats to the community and environment. As enthusiasts of water resources and climate resilience, staying informed and engaged in the safety and upkeep of structures like Cobbs Mill Dam is vital for ensuring the long-term sustainability of our water systems.
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 Cobbs Mill Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Cohansey River At Seeley Nj | 19 cfs | → |
| Salem River At Woodstown Nj | 6 cfs | → |
| Maurice River At Norma Nj | 73 cfs | → |
| Raccoon Creek Near Swedesboro Nj | 16 cfs | → |
| Little Ease Rn Nr Clayton Nj | 2 cfs | → |
| Shellpot Creek At Wilmington | 2 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Cobbs Mill Dam.
Boat launches
- Piney Point Trail Cumberland County
- Chestnut Road 291, Cumberland County
- Wma Access Road Cumberland County
- East Broad Street 13, Bridgeton
- Stow Neck Road Salem County
- Centerton Road Elmer
Campgrounds
- Yogi Bear Tall Pines Campground
- Parvin State Park
- Lums Pond Youth Camping
- Tinicum Island Primitive Campsite
- Indian Branch Park Campground
- Dover Afb Military
Fishing spots
Track Cobbs Mill 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 Cobbs Mill Dam
Where does the data for Cobbs Mill 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 Significant 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 Cobbs Mill Dam.