Warner Gap Hollow Dam dam
Warner Gap Hollow Dam
Warner Gap Hollow Dam, also known as Edgemont, is a vital water supply structure located in Washington County, Maryland. Built in 1902, this earth dam stands at a height of 65 feet and spans 700 feet in length, containing a storage capacity of 296 acre-feet. It serves the primary purpose of providing water supply to the surrounding area, with a drainage area of 2.3 square miles and a normal storage level of 246 acre-feet.
Despite its historical significance, Warner Gap Hollow Dam has been classified with a high hazard potential and an unsatisfactory condition assessment, prompting regular inspections and maintenance measures. The dam's spillway operates on an uncontrolled basis, with a spillway width of 25 feet. In 1993, the dam underwent hydraulic and structural modifications to enhance its safety and reliability, under the supervision of Whitman, Requardt & Assoc. The dam is subject to state regulatory oversight by the Maryland Dam Safety agency, ensuring compliance with safety standards and enforcement measures.
Warner Gap Hollow Dam's association with the Warner Gap Hollow Creek and its critical role in water supply maintenance make it a significant infrastructure element in the region. With a moderate risk assessment rating and notable historical background, the dam presents an intriguing case study for water resource and climate enthusiasts interested in the intersection of infrastructure, environmental regulations, and risk management practices.
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 Warner Gap Hollow Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Antietam Creek Near Waynesboro | 48 cfs | → |
| Conococheague Creek At Fairview | 197 cfs | → |
| Marsh Run At Grimes | 6 cfs | → |
| Catoctin Creek Near Middletown | 17 cfs | → |
| Monocacy River At Bridgeport | 33 cfs | → |
| Big Pipe Creek At Bruceville | 28 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Warner Gap Hollow Dam.
Boat launches
- Catoctin Hollow Road 13916, Frederick County
- Big Red Trail Mount Lena
- Taylors Landing
- Frederick
- Snyders Landing Road 17045, Sharpsburg
- Chesapeake And Ohio Canal Trail Washington County
Campgrounds
- Owens Creek - Catoctin Mountain National Park
- Owens Creek Campground
- Camp Round Meadow
- Adirondack Shelters Camping Area
- Poplar Grove Ii Group Camping Area
- Poplar Grove I Group Camping Area
Fishing spots
- Hunting Creek Lake
- Little Owens Creek
- Culler Lake
- Potomac River Reservoir
- Chesapeake And Ohio Canal
- Melagos Fising Spot
Track Warner Gap Hollow 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 Warner Gap Hollow Dam
Where does the data for Warner Gap Hollow 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 Warner Gap Hollow Dam.