Allegheny River Lock And Dam 9 dam
Allegheny River Lock And Dam 9
Allegheny River Lock and Dam 9, also known as Allegheny River Pool 09, is a gravity dam located in Armstrong County, Pennsylvania. Completed in 1938 by the US Army Corps of Engineers, the dam serves primarily for navigation purposes on the Allegheny River. With a structural height of 55 feet and a hydraulic height of 30 feet, the dam spans 1040 feet in length and has a storage capacity of 13,500 acre-feet.
The dam features a single lock with dimensions of 360 feet in length and 56 feet in width, facilitating the passage of vessels along the river. While the hazard potential of the dam is considered low, it is still subject to regular inspections and risk management measures to ensure its structural integrity and mitigate any potential flood risks associated with the dam. The US Army Corps of Engineers actively monitors the dam's condition, engages with emergency managers, and updates emergency action plans to address any concerns related to the dam's operation and safety.
In the event of severe weather or unforeseen circumstances, the dam may release water to manage levels upstream or downstream, highlighting the importance of ongoing risk assessment and communication with local stakeholders. As part of its commitment to safety and preparedness, the US Army Corps of Engineers continues to implement measures to safeguard the dam and surrounding communities, emphasizing the importance of proactive maintenance and collaboration in mitigating potential risks associated with water resource management and climate variability.
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 Allegheny River Lock And Dam 9 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Redbank Creek At St. Charles | 530 cfs | → |
| Allegheny River At Kittanning | 15,300 cfs | → |
| Allegheny River At Parker | 12,700 cfs | → |
| Mahoning Creek At Mahoning Creek Dam | 371 cfs | → |
| Crooked Creek At Crooked Creek Dam | 159 cfs | → |
| Clarion River Near Piney | 1,330 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Allegheny River Lock And Dam 9.
Boat launches
- Spot Road Armstrong County
- Armstrong Trail Clarion County
- Bellalou Road 175, Armstrong County
- Brady's Bend
- 2nd Street East Brady
- Templeton
Campgrounds
- Burnt Ridge Campground
- Redbank Valley Municipal Park
- Crooked Creek Recreation Area
- Milton Loop
- Copperhead Retreat
- Danner Campground
Paddle runs
Track Allegheny River Lock And Dam 9 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 Allegheny River Lock And Dam 9
Where does the data for Allegheny River Lock And Dam 9 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 Low 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 Allegheny River Lock And Dam 9.