Seneca Creek at Dawsonville, MD

River level and flood forecast · Montgomery County

Normal2.6 ftas of Tue 12:50 AM

The river is 4.9 ft below flood stage (7.5 ft).

Forecast to fall to 2.1 ft by Thu, Oct 15, 8 PM.

Flow: 224 cubic feet per second (USGS).

The last 7 days and the forecast

02.557.51012.5WedThuFriSatSunMonTueWedThuAction 5 ftFlood 7.5 ftModerate 11 ftNowObserved (ft)NWS forecast

NWS forecast issued Mon, Oct 12, 8:57 PM. Forecasts change as rain falls and as upstream water arrives.

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Flood stages

Major flood stage16 ft
Moderate flood stage11 ft
Flood stage7.5 ft
Action stage5 ft
Record crest (June 22, 1972)16.4 ft

What floods at each level

From the National Weather Service, highest first.

  • 34 ftWater covers the Route 28 bridge near Dawsonville.
  • 21 ftWater reaches the parking lot off Route 28 for Seneca Creek State Park.
  • 16 ftNumerous roads are flooded near Seneca Creek. The exact roads affected will depend on which portion of the basin received the heaviest rainfall.
  • 14 ftWater reaches the instrumentation inside the gage house. Automated reports from this location will likely be unavailable above this level.
  • 11 ftWater from the creek enters the gage house. Reports from this location may become sporadic. Multiple roads are flooded, and water is also reaching the first floor of Old Black Rock Mill.
  • 7.5 ftPortions of the Seneca Creek Greenway are flooded. A small portion of Berryville Road west of Darnestown begins to flood.
  • 5 ftWater begins to overflow the banks underneath the route 28 bridge. Users of the seneca creek greenway should seek higher ground at these levels.

Highest crests on record

  1. 16.4 ft — June 22, 1972
  2. 16.32 ft — September 12, 1971
  3. 15.78 ft — September 9, 2011
  4. 12.69 ft — September 6, 1979
  5. 12.67 ft — September 26, 1975

Recent crests: 7.9 ft (January 10, 2024) · 7.72 ft (December 18, 2023) · 7.68 ft (September 23, 2021) · 9 ft (November 1, 2019) · 11.73 ft (July 8, 2019)

Up and down the river, and nearby

Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (DAWM2); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.