Tomahawk Lake Dam dam
Tomahawk Lake Dam
Tomahawk Lake Dam, located in Washingtonville, New York, serves as a significant recreational area along Cromline Creek. Built in 1929, this private earth dam stands at a height of 25 feet and stretches over 1,000 feet in length. The dam boasts a storage capacity of 3,359 acre-feet, providing ample space for recreational activities such as boating, fishing, and swimming. Despite its age, the dam is regularly inspected by the New York State Department of Environmental Conservation to ensure its structural integrity and safety.
With a high hazard potential, Tomahawk Lake Dam is classified as having a satisfactory condition assessment as of September 2017. The dam features an uncontrolled spillway with a width of 150 feet, allowing for excess water to flow safely downstream. Although the risk assessment is moderate, emergency action plans are in place to mitigate any potential dangers. The dam's close proximity to residential areas underscores the importance of ongoing monitoring and maintenance to safeguard against potential risks and protect the surrounding community and environment. For water resource and climate enthusiasts, Tomahawk Lake Dam stands as a testament to the importance of responsible dam management and the vital role dams play in providing both recreational opportunities and flood control 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 Tomahawk Lake Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Wanaque River At Awosting Nj | 10 cfs | → |
| Wallkill River At Gardiner Ny | 286 cfs | → |
| Ramapo River At Ramapo Ny | 60 cfs | → |
| Mahwah River Near Suffern Ny | 7 cfs | → |
| Neversink River At Godeffroy Ny | 300 cfs | → |
| Ringwood Creek Near Wanaque Nj | 8 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Tomahawk Lake Dam.
Boat launches
- Old East Main Street Town Of Wallkill
- State Highway 208 3081, Wallkill
- Laurel Meadow Drive Town Of Warwick
- Bear Mountain Bridge Road Cortlandt
- Blue Lake Road Town Of Warwick
- Hudson Avenue Peekskill
Campgrounds
- Winding Hills Park
- Round Pond Military
- Beaver Pond Campsite
- Beaver Pond - Harriman State Park
- Camping For Hikers On Ballfield Graymoor Center
- Blue Mountain Reservation
Fishing spots
Paddle runs
- Kent Bridge To Boardman Bridge
- Pond Downstream Of Shepaug Reservoir Dam, Marked By Service Road Bridge To Ends In Backwaters Of Lake Lillinonah, Near Roxbury Falls
- Begins Downstream Of The Borough Of Bantam, At Stoddard Road Bridge To The Confluence With The Shepaug River
Track Tomahawk 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 Tomahawk Lake Dam
Where does the data for Tomahawk 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 Tomahawk Lake Dam.