Greenbrier State Park Dam & Dike dam
Greenbrier State Park Dam & Dike
Greenbrier State Park Dam & Dike, located in Mount Lena/Greenbriar, Maryland, is a state-owned structure designed for flood risk reduction along the Little Beaver Creek-TR. Built in 1965, this earth dam stands at a height of 64 feet and stretches 445 feet in length, with a maximum storage capacity of 734 acre-feet. The dam's spillway, of uncontrolled type, boasts a width of 145 feet to handle a maximum discharge of 14,168 cubic feet per second.
Despite its critical role in flood control, the dam's condition assessment in April 2021 deemed it unsatisfactory, with a high hazard potential. The structure was last inspected in August 2021, with a recommended inspection frequency of once a year. The dam underwent structural modifications in 1996, and its emergency action plan (EAP) status is currently unknown. With a moderate risk assessment rating, the Greenbrier State Park Dam & Dike presents a complex management challenge that requires ongoing monitoring and maintenance to ensure public safety and infrastructure resilience in the face of changing climate patterns.
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 Greenbrier State Park Dam & Dike -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Catoctin Creek Near Middletown | 14 cfs | → |
| Antietam Creek Near Sharpsburg | 129 cfs | → |
| Marsh Run At Grimes | 6 cfs | → |
| Potomac River At Shepherdstown | 1,860 cfs | → |
| Antietam Creek Near Waynesboro | 39 cfs | → |
| Monocacy River At Monocacy Blvd At Frederick | 156 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Greenbrier State Park Dam & Dike.
Boat launches
- Big Red Trail Mount Lena
- Taylors Landing
- Snyders Landing Road 17045, Sharpsburg
- Catoctin Hollow Road 13916, Frederick County
- North Princess Street 398, Shepherdstown
- Chesapeake And Ohio Canal Trail Washington County
Campgrounds
- Greenbrier State Park
- Pogo Memorial Campground
- Dahlgren Backpack Camping Area
- Gambrill State Park
- Horseshoe Bend Hiker Biker Campsite
- Horseshoe Bend Campsite
Fishing spots
- Hunting Creek Lake
- Potomac River Reservoir
- Chesapeake And Ohio Canal
- Culler Lake
- Little Owens Creek
- Blairs Valley Lake
Track Greenbrier State Park Dam & Dike 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 Greenbrier State Park Dam & Dike
Where does the data for Greenbrier State Park Dam & Dike 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 Greenbrier State Park Dam & Dike.