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Hydrograph River at a Glance Download
Difficult Run at Browns Mill Road / Wolf Trap Stage (ft)Observed: 193.76 ft at 7:45PM Oct 27, 2020Observed: 193.76 ft at 1:45PM Oct 28, 2020Observed: 193.87 ft at 11:50AM Oct 29, 2020Observed: 194.02 ft at 11:55AM Oct 29, 2020Observed: 194.14 ft at 12:00PM Oct 29, 2020Observed: 194.38 ft at 12:05PM Oct 29, 2020Observed: 194.49 ft at 12:10PM Oct 29, 2020Observed: 194.63 ft at 12:15PM Oct 29, 2020Observed: 194.75 ft at 12:20PM Oct 29, 2020Observed: 194.86 ft at 12:30PM Oct 29, 2020Observed: 194.97 ft at 12:35PM Oct 29, 2020Observed: 195.08 ft at 12:45PM Oct 29, 2020Observed: 195.19 ft at 1:05PM Oct 29, 2020Observed: 195.29 ft at 1:45PM Oct 29, 2020Observed: 195.3 ft at 2:00PM Oct 29, 2020Observed: 195.52 ft at 3:15PM Oct 29, 2020Observed: 195.63 ft at 4:00PM Oct 29, 2020Highest Observation: 195.64 ft at 7:05PM Oct 29, 2020Observed: 195.53 ft at 7:40PM Oct 29, 2020Observed: 195.52 ft at 7:45PM Oct 29, 2020Observed: 195.27 ft at 8:10PM Oct 29, 2020Observed: 195.15 ft at 8:20PM Oct 29, 2020Observed: 195.04 ft at 8:25PM Oct 29, 2020Observed: 194.92 ft at 8:30PM Oct 29, 2020Observed: 194.81 ft at 8:35PM Oct 29, 2020Observed: 194.68 ft at 8:40PM Oct 29, 2020Observed: 194.56 ft at 8:45PM Oct 29, 2020Observed: 194.44 ft at 8:50PM Oct 29, 2020Observed: 194.31 ft at 8:55PM Oct 29, 2020Observed: 194.18 ft at 9:00PM Oct 29, 2020Observed: 194.07 ft at 9:05PM Oct 29, 2020Observed: 193.95 ft at 9:10PM Oct 29, 2020Observed: 193.89 ft at 9:15PM Oct 29, 2020Observed: 193.78 ft at 9:50PM Oct 29, 2020Observed: 193.76 ft at 7:45AM Oct 30, 2020DRBV2(plotting HGIRR) Graph Created (12:40PM Oct 31, 2020)ObservedLatest observed value: 193.76 ft at 7:45 AM EDT 30-Oct-2020. Flood Stage is 195 ft
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Tabular Data (UTC)
Tabular Data (EDT)
XML Data
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Datum: Not Available
NOTE: Forecasts are not available for the Difficult Run at Browns Mill Road / Wolf Trap. Only observed stages are available for this point.
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Flood Categories (in feet)
Major Flood Stage: 0
Moderate Flood Stage: 0
Flood Stage: 195
Action Stage: 194.3
Low Stage (in feet): -9999

Historic Crests
Currently none available.

Recent Crests
Currently none available.

Low Water Records
Currently none available.
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Latitude/Longitude Disclaimer: The gauge location shown in the above map is the approximate location based on the latitude/longitude coordinates provided to the NWS by the gauge owner.
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195 Six inches of water covers the road at its lowest point.
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Latitude: 38.952778° N, Longitude: 77.291111° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft 195 ft Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum Elevation
(gauge height = 0)
(gauge height = flood stage)
Elevation information source
NAVD88 Not Available Not Available Survey grade GPS equipment, FEMA flood plain maps, newer USGS topographic maps
NGVD 29 Not Available Not Available Older USGS topographic maps, NGVD29 benchmarks
MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks
Other Not Available Not Available  
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NWS Information
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(Baltimore/Washington) Sterling Weather Forecast Office
43858 Weather Service Rd.
Sterling, VA 20166
(703) 996-2200
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Page last modified: 1-Mar-2019 12:35 AM
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