Hammond Dam dam
Hammond Dam
Hammond Dam, also known as Hammond Lake, is a rockfill dam located in Tioga, Pennsylvania, completed in 1978 by the US Army Corps of Engineers. The primary purpose of this Federal-owned structure is flood risk reduction, with a normal storage capacity of 8,625 acre-feet and a maximum storage capacity of 136,936 acre-feet. The dam stands at a height of 122 feet and spans 6,450 feet along Crooked Creek, a tributary of the Tioga River.
While Hammond Dam plays a crucial role in reducing the risk of flooding to downstream communities, there are still potential hazards that could lead to significant flooding events. High-volume releases from the dam's spillway during severe storms could result in downstream flooding, impacting communities along the Tioga, Chemung, and North Branch Susquehanna Rivers. Although the dam is regularly inspected and monitored by the US Army Corps of Engineers, there are scenarios involving dam breaches that could have devastating consequences for surrounding areas.
To manage and reduce these risks, the US Army Corps of Engineers performs ongoing activities to ensure the integrity of Hammond Dam. This includes regular inspections, monitoring during high water events, and updating the Emergency Action Plan to respond to potential flood events effectively. By closely following rainfall forecasts and collaborating with federal, state, and local emergency managers, the US Army Corps of Engineers remains prepared to safeguard downstream communities and minimize the impact of any potential flooding incidents.
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 Hammond Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Tioga River At Tioga | 2,050 cfs | → |
| Tioga River At Tioga Junction | 1,930 cfs | → |
| Cowanesque River Near Lawrenceville | 1,590 cfs | → |
| Crooked Cr Bl Catlin Hollow At Middlebury Center | 163 cfs | → |
| Tioga River Near Mansfield | 349 cfs | → |
| Tioga River At Lindley Ny | 59 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Hammond Dam.
Boat launches
Campgrounds
- Ives Run
- Tompkins River
- Hills Creek State Park
- Leonard Harrison State Park
- Colton Point State Park
- Twin Streams Campground
Paddle runs
- The Colton Road Bridge Near Ansonia, Pennsylvania To Blackwell, Pennsylvania
- Blackwell, Pennsylvania To Short Mountain Gap Near Torbert, Pennsylvania
More reservoirs
Track Hammond 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 Hammond Dam
Where does the data for Hammond 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 Hammond Dam.