Calvert Gateway dam
Calvert Gateway
Calvert Gateway, also known as Penwick Village, is a privately owned dam located in Calvert County, Maryland. Completed in 2000, this earth-type dam stands 16 feet tall and spans 200 feet in length, with a storage capacity of 4.05 acre-feet and a surface area of 0.9 acres. The primary purpose of this structure is for recreation, offering opportunities for outdoor activities in the surrounding area.
Managed by the Maryland Dam Safety regulatory agency, Calvert Gateway has a significant hazard potential and is classified as being in fair condition as of the last assessment in April 2021. The dam is equipped with an uncontrolled spillway, measuring 40 feet in width, and has a maximum discharge capacity of 367 cubic feet per second. With a moderate risk assessment rating and a regular inspection frequency, this structure plays a crucial role in managing water resources and ensuring public safety in the region.
Situated near Hall Creek in the Apple Green Business Park, Calvert Gateway serves as a vital infrastructure for the local community. With its strategic location and functional design, this dam not only provides recreational opportunities but also contributes to water resource management efforts in Maryland. Climate and water resource enthusiasts can appreciate the importance of structures like Calvert Gateway in safeguarding the environment and enhancing the resilience of the region against potential hazards.
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 Calvert Gateway -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Western Branch At Upper Marlboro | 25 cfs | → |
| Patuxent River Near Bowie | 144 cfs | → |
| Piscataway Creek At Piscataway | 4 cfs | → |
| Watts Branch At Washington | 1 cfs | → |
| Zekiah Swamp Run Near Newtown | 4 cfs | → |
| North East Branch Anacostia River At Riverdale | 24 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Calvert Gateway.
Boat launches
- Critical Area Driving Tour Prince George's County
- Magruders Ferry Road 17901, Brandywine
- Marlboro Road 1570, Anne Arundel County
- Branch Street Calvert County
- Holly Road 302, Selby-On-The-Bay
- Hallowing Point Road 6935, Calvert County
Campgrounds
- Selby's Landing
- Cedarville State Forest
- Andrews Afb Military
- Louise F. Cosca Regional Park
- Camp Loop B
- Camp Loop A
Fishing spots
Track Calvert Gateway 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 Calvert Gateway
Where does the data for Calvert Gateway 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 Calvert Gateway.