Hagerstown Municipal Pwr Plant Dam dam
Hagerstown Municipal Pwr Plant Dam
The Hagerstown Municipal Power Plant Dam, also known as the Mt Aetna Dam, is a privately owned structure located in Washington County, Maryland. This earth dam was completed in 1950 and serves primarily as a water supply source, with a storage capacity of 60 acre-feet and a normal storage level of 48 acre-feet. The dam spans a length of 250 feet and has a height of 10 feet, impounding water from the Antietam Creek.
Managed by the Maryland Dam Safety agency, the Hagerstown Municipal Power Plant Dam has a low hazard potential and is currently rated in fair condition. The spillway, with a width of 250 feet, is uncontrolled, allowing excess water to safely flow downstream. The dam's drainage area is 176.2 square miles, with a maximum discharge capacity of 775 cubic feet per second. Despite its moderate risk assessment, the dam has not been significantly modified since its construction, highlighting the importance of regular inspections and maintenance to ensure its continued safety and functionality for water resource and climate enthusiasts 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 Hagerstown Municipal Pwr Plant Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Antietam Creek Near Waynesboro | 36 cfs | → |
| Conococheague Creek At Fairview | 161 cfs | → |
| Marsh Run At Grimes | 6 cfs | → |
| Antietam Creek Near Sharpsburg | 127 cfs | → |
| Potomac River At Shepherdstown | 1,580 cfs | → |
| Catoctin Creek Near Middletown | 13 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Hagerstown Municipal Pwr Plant Dam.
Boat launches
- Big Red Trail Mount Lena
- Taylors Landing
- Chesapeake And Ohio Canal Trail Washington County
- Snyders Landing Road 17045, Sharpsburg
- Starliper Road Washington County
- Blairs Valley Lake
Campgrounds
- Yogi Bear's Jellystone Park
- Pogo Memorial Campground
- Jordan Junction Campsite
- Jordan Junction Hiker Biker Campsite
- Greenbrier State Park
- Cumberland Valley Hiker Biker Campsite
Fishing spots
- Potomac River Reservoir
- Chesapeake And Ohio Canal
- Blairs Valley Lake
- Hunting Creek Lake
- Little Owens Creek
- Culler Lake
Track Hagerstown Municipal Pwr Plant 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 Hagerstown Municipal Pwr Plant Dam
Where does the data for Hagerstown Municipal Pwr Plant 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 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 Hagerstown Municipal Pwr Plant Dam.