Brighton dam
Brighton
Brighton, also known as Tridelphia Lake Dam, is a significant water resource structure located in Montgomery County, Maryland, near Laurel. Built in 1943, this buttress dam serves the dual purposes of hydroelectric power generation and water supply, with a maximum storage capacity of 19,560 acre-feet and a normal storage level of 17,200 acre-feet. The dam stands at a height of 82 feet and stretches 995 feet in length, with a spillway width of 340 feet to control water discharge.
Managed by the local government and regulated by the Maryland Dam Safety agency, Brighton is situated along the Patuxent River and falls under the jurisdiction of the Federal Energy Regulatory Commission. With a high hazard potential and very high risk assessment rating, the dam is subject to regular inspections and emergency action plan requirements to ensure public safety. The dam's outlet gates consist of Tainter (radial) structures, totaling 13 in number, to manage water flow and maintain operational efficiency.
Despite its age, Brighton continues to play a crucial role in water management and renewable energy production in the region. With a strong emphasis on safety and compliance with regulatory standards, the dam remains a vital component of Maryland's water infrastructure, highlighting the intersection of water resource management and climate resilience in a changing environment.
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 Brighton -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Patuxent River Below Brighton Dam Near Brighton | 14 cfs | → |
| Hawlings River Near Sandy Spring | 17 cfs | → |
| Patuxent River Near Unity | 15 cfs | → |
| Cattail Creek Near Glenwood | 16 cfs | → |
| Little Patuxent River At Guilford | 122 cfs | → |
| Patuxent Riv Near Laurel | 19 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Brighton .
Boat launches
- Supplee Launch
- Lightspun Lane 5665, Long Reach
- 99 Drop Howard County
- Piney Run Park
- Liberty Road Carroll County
- Lakeview Avenue Carroll County
Campgrounds
- Greenbelt Park
- Little Bennett Campground
- Camp Loop D
- Camp Loop C
- Little Bennett Regional Park
- Camp Loop A
Track Brighton 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 Brighton
Where does the data for Brighton 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 Brighton .