Port Jervis Reservoir #1 Dam dam
Port Jervis Reservoir #1 Dam
Situated in Port Jervis, New York, the Port Jervis Reservoir #1 Dam stands as a vital component of the local water supply infrastructure. Completed in 1869, this earth dam boasts a height of 20 feet and a length of 230 feet, with a storage capacity of 550 acre-feet. Serving the primary purpose of water supply, it holds a normal storage level of 198 acre-feet and covers a surface area of 20 acres, drawing from a drainage area of 1.73 square miles along the TR-Neversink River.
Maintained by the New York State Department of Environmental Conservation, the dam is regulated, inspected, and enforced by state authorities to ensure its structural integrity and operational safety. With a high hazard potential, the dam is categorized as being in fair condition, with a moderate risk assessment. Equipped with an uncontrolled spillway and a spillway width of 36 feet, the dam is designed to manage potential floods and safeguard the surrounding area. Despite its age, the dam continues to play a crucial role in securing a reliable water supply for the community.
As a historic structure with a significant impact on water resource management in the region, the Port Jervis Reservoir #1 Dam remains a testament to the enduring importance of infrastructure in sustaining local environments and communities. With regular inspections and maintenance, this earth dam continues to serve as a key asset in ensuring water security and mitigating potential risks associated with its operation. For water resource and climate enthusiasts, the dam represents a tangible link between past engineering achievements and present-day efforts to adapt to changing environmental 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 Port Jervis Reservoir #1 Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Delaware River At Port Jervis Ny | 3,490 cfs | → |
| Neversink River At Godeffroy Ny | 300 cfs | → |
| Mongaup River Near Mongaup Ny | 205 cfs | → |
| Delaware River At Montague Nj | 3,950 cfs | → |
| Shohola Creek Near Walker Lake | 58 cfs | → |
| Delaware R Above Lackawaxen R Nr Barryville Ny | 2,590 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Port Jervis Reservoir #1 Dam.
Boat launches
- Matamoras
- Plank Road Town Of Forestburgh
- Butler Court Town Of Mamakating
- Winding Waters Trail Town Of Warwick
- Town Of Mamakating
- Otter Lane 101, Dingman Township
Track Port Jervis Reservoir #1 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 Port Jervis Reservoir #1 Dam
Where does the data for Port Jervis Reservoir #1 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 Port Jervis Reservoir #1 Dam.