Tarrytown Waterworks Dam dam
Tarrytown Waterworks Dam
The Tarrytown Waterworks Dam, also known as the Tarrytown Reservoir, is a critical water supply infrastructure located in Elmsford, Westchester, New York. Built in 1897, this earth dam stands at a height of 18 feet and has a length of 315 feet, providing a storage capacity of 1100 acre-feet. The dam serves as a primary source of water for the surrounding area, with a normal storage capacity of 890 acre-feet and a surface area of 81 acres.
Managed by the local government, the Tarrytown Waterworks Dam is regulated by the New York State Department of Environmental Conservation (NYS DEC) and undergoes regular inspections to ensure its safety and functionality. However, recent assessments have shown that the dam is in poor condition, with a high hazard potential. Despite this, the risk assessment is moderate (3), indicating a need for continued monitoring and potential risk management measures to mitigate any potential hazards.
The Tarrytown Waterworks Dam plays a crucial role in maintaining water supply for the region, but its poor condition raises concerns for both water resource and climate enthusiasts. As efforts are made to address the dam's maintenance needs and ensure its long-term safety, it serves as a reminder of the importance of investing in and sustaining vital infrastructure to safeguard against potential risks and ensure the resilience of our water resources in the face of changing climate conditions.
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 Tarrytown Waterworks Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Hackensack River At West Nyack Ny | 10 cfs | → |
| Croton R @ New Croton Dam Nr Croton-On-Hudson Ny | 202 cfs | → |
| Hackensack River At Rivervale Nj | 28 cfs | → |
| Pascack Brook At Park Ridge Nj | 7 cfs | → |
| Pascack Brook At Westwood Nj | 27 cfs | → |
| Hackensack River At New Milford Nj | 5 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Tarrytown Waterworks Dam.
Boat launches
- Croton Riverwalk Croton-On-Hudson
- Maple Way 10, Town Of North Castle
- Warburton Avenue 565, Hastings-On-Hudson
- Cortlandt Street Cortlandt
- Battlefield Road Town Of Stony Point
- Seagate Road 3, Greenwich
Campgrounds
- Croton Point Park
- Blue Mountain Reservation
- Beaver Pond - Harriman State Park
- Beaver Pond Campsite
- Ward Pound Ridge Reservation
- Camping For Hikers On Ballfield Graymoor Center
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 Tarrytown Waterworks 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 Tarrytown Waterworks Dam
Where does the data for Tarrytown Waterworks 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 Tarrytown Waterworks Dam.