Phillips Mill Pond Dam dam
Phillips Mill Pond Dam
Phillips Mill Pond Dam, located in Smithtown, New York, is a state-regulated structure on the Nissequogue River with a primary purpose of recreation. This earth-type dam, completed in 1850, stands at a height of 10 feet and stretches 500 feet in length. With a maximum storage capacity of 23 acre-feet, the dam serves as a recreational spot covering a surface area of 7 acres.
Despite its historical significance, the dam's condition assessment is poor, with a significant hazard potential. The last inspection in 2018 revealed maintenance issues, indicating a need for repair and reinforcement. With a moderate risk assessment rating of 3, there is a call for enhanced risk management measures to ensure the safety and stability of the dam for both recreational and environmental purposes.
Water resource and climate enthusiasts interested in the preservation and sustainability of dams like Phillips Mill Pond Dam should be aware of its current condition and the importance of regular inspections and maintenance to mitigate potential risks. As a vital structure on the Nissequogue River, efforts to improve its condition and reduce hazards can contribute to the overall health and resilience of the water ecosystem 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 Phillips Mill Pond Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Nissequogue River Near Smithtown Ny | 31 cfs | → |
| Connetquot Bk Nr Central Islip Ny | 21 cfs | → |
| Sampawams Creek At Babylon Ny | 9 cfs | → |
| Carlls River At Babylon Ny | 15 cfs | → |
| Cold Spring Brook At Cold Spring Harbor Ny | 2 cfs | → |
| Swan River At East Patchogue Ny | 12 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Phillips Mill Pond Dam.
Boat launches
- Long Island Greenbelt Trail Suffolk County
- Long Beach Road Nissequogue
- Lake Ronkonkoma
- Scudder Park
- Asharoken Avenue Asharoken
Campgrounds
- Blydenburgh Park
- Park Shore Day Camp
- Battle Row
- Cathedral Pines County Park
- Watch Hill Campgrounds
- Southaven County Park
Fishing spots
Track Phillips Mill Pond 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 Phillips Mill Pond Dam
Where does the data for Phillips Mill Pond 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 Phillips Mill Pond Dam.