Jeannette (Mountain Valley Lake) dam
Jeannette (Mountain Valley Lake)
Jeannette (Mountain Valley Lake) is a private water resource nestled in the picturesque Hempfield Township of Westmoreland, Pennsylvania. This earth dam, completed in 1889, stands at a height of 36 feet and spans 480 feet in length, providing a serene setting for recreational activities. The lake has a storage capacity of 300 acre-feet, with a normal storage level of 230 acre-feet and a surface area of 9 acres, making it an ideal spot for water and climate enthusiasts to explore.
Managed by the Pennsylvania Department of Environmental Protection, Jeannette (Mountain Valley Lake) is regulated and inspected regularly to ensure its safety and functionality. With a significant hazard potential and a fair condition assessment, the dam poses a moderate risk that is mitigated through risk management measures. The lake's spillway, with a width of 8 feet, is uncontrolled, adding to the natural beauty and charm of this recreational reservoir. Its waters are sourced from TR BRUSH CREEK and offer opportunities for outdoor activities in a tranquil environment.
The dam at Jeannette (Mountain Valley Lake) has undergone modifications in 2007 to enhance its hydraulic and structural integrity. With a designated inspection frequency and emergency action plan readiness, the dam is well-prepared to handle any potential risks. The picturesque location, combined with the recreational opportunities it offers, makes Jeannette a must-visit destination for water resource and climate enthusiasts seeking a peaceful retreat in the heart of Pennsylvania's beautiful countryside.
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 Jeannette (Mountain Valley Lake) -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Youghiogheny River At Sutersville | 1,340 cfs | → |
| Loyalhanna Creek At Loyalhanna Dam | 221 cfs | → |
| Loyalhanna Creek At Kingston | 203 cfs | → |
| Conemaugh River At Tunnelton | 1,220 cfs | → |
| Monongahela River At Elizabeth | 21,100 cfs | → |
| Youghiogheny River At Connellsville | 1,090 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Jeannette (Mountain Valley Lake).
Boat launches
Campgrounds
- Keystone State Park
- Bush
- Cedar Creek Trekker Campground
- Camp Ligonier
- Antiochian Village Camp
- Kooser State Park
Paddle runs
Track Jeannette (Mountain Valley Lake) 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 Jeannette (Mountain Valley Lake)
Where does the data for Jeannette (Mountain Valley Lake) 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 Jeannette (Mountain Valley Lake).