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Web Portal Changes: The Advanced Hydrologic Prediction Service (AHPS) hosted at https://water.weather.gov will be replaced by the National Water Prediction Service (NWPS), with a target of March 2024. Existing AHPS content and features will be preserved and expanded within NWPS.

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Hydrograph River at a Glance Download
Flat Branch at Lomond Drive Stage (ft)Observed: 1.44 ft at 7:10AM Sep 23, 2023Observed: 1.54 ft at 7:55AM Sep 23, 2023Observed: 1.66 ft at 8:05AM Sep 23, 2023Observed: 1.67 ft at 8:10AM Sep 23, 2023Observed: 1.78 ft at 8:50AM Sep 23, 2023Observed: 1.83 ft at 9:10AM Sep 23, 2023Observed: 1.73 ft at 9:45AM Sep 23, 2023Observed: 1.64 ft at 10:10AM Sep 23, 2023Observed: 1.54 ft at 10:35AM Sep 23, 2023Observed: 1.45 ft at 11:10AM Sep 23, 2023Observed: 1.35 ft at 12:10PM Sep 23, 2023Observed: 1.29 ft at 1:10PM Sep 23, 2023Observed: 1.24 ft at 2:10PM Sep 23, 2023Observed: 1.24 ft at 3:10PM Sep 23, 2023Observed: 1.35 ft at 3:50PM Sep 23, 2023Observed: 1.45 ft at 4:05PM Sep 23, 2023Observed: 1.46 ft at 4:10PM Sep 23, 2023Observed: 1.48 ft at 5:10PM Sep 23, 2023Observed: 1.6 ft at 5:25PM Sep 23, 2023Observed: 1.7 ft at 5:35PM Sep 23, 2023Observed: 1.81 ft at 5:45PM Sep 23, 2023Observed: 1.91 ft at 5:55PM Sep 23, 2023Observed: 2 ft at 6:10PM Sep 23, 2023Observed: 2.11 ft at 6:40PM Sep 23, 2023Observed: 2.21 ft at 6:55PM Sep 23, 2023Observed: 2.16 ft at 7:10PM Sep 23, 2023Observed: 2.06 ft at 7:25PM Sep 23, 2023Observed: 1.95 ft at 7:45PM Sep 23, 2023Observed: 1.85 ft at 8:05PM Sep 23, 2023Observed: 1.83 ft at 8:10PM Sep 23, 2023Observed: 1.72 ft at 8:30PM Sep 23, 2023Observed: 1.62 ft at 9:10PM Sep 23, 2023Observed: 1.67 ft at 10:10PM Sep 23, 2023Observed: 1.57 ft at 10:35PM Sep 23, 2023Observed: 1.48 ft at 11:10PM Sep 23, 2023Observed: 1.42 ft at 12:10AM Sep 24, 2023Observed: 1.37 ft at 1:10AM Sep 24, 2023Observed: 1.4 ft at 2:10AM Sep 24, 2023Observed: 1.51 ft at 2:40AM Sep 24, 2023Observed: 1.61 ft at 2:55AM Sep 24, 2023Observed: 1.72 ft at 3:05AM Sep 24, 2023Observed: 1.75 ft at 3:10AM Sep 24, 2023Observed: 1.87 ft at 3:35AM Sep 24, 2023Observed: 1.97 ft at 3:50AM Sep 24, 2023Observed: 2.08 ft at 4:05AM Sep 24, 2023Observed: 2.11 ft at 4:10AM Sep 24, 2023Observed: 2.23 ft at 4:30AM Sep 24, 2023Observed: 2.33 ft at 4:45AM Sep 24, 2023Observed: 2.44 ft at 4:55AM Sep 24, 2023Observed: 2.56 ft at 5:00AM Sep 24, 2023Observed: 2.65 ft at 5:10AM Sep 24, 2023Highest Observation: 2.75 ft at 5:20AM Sep 24, 2023Observed: 2.65 ft at 5:55AM Sep 24, 2023Observed: 2.58 ft at 6:10AM Sep 24, 2023Observed: 2.47 ft at 6:30AM Sep 24, 2023Observed: 2.37 ft at 6:50AM Sep 24, 2023Observed: 2.26 ft at 7:10AM Sep 24, 2023Observed: 2.16 ft at 7:30AM Sep 24, 2023Observed: 2.12 ft at 8:10AM Sep 24, 2023Observed: 2.09 ft at 9:10AM Sep 24, 2023Observed: 1.98 ft at 10:00AM Sep 24, 2023Observed: 1.96 ft at 10:10AM Sep 24, 2023Observed: 1.85 ft at 10:35AM Sep 24, 2023Observed: 1.75 ft at 11:05AM Sep 24, 2023Observed: 1.74 ft at 11:10AM Sep 24, 2023Observed: 1.64 ft at 11:55AM Sep 24, 2023Observed: 1.64 ft at 12:10PM Sep 24, 2023Observed: 1.63 ft at 1:10PM Sep 24, 2023Observed: 1.55 ft at 2:10PM Sep 24, 2023Observed: 1.22 ft at 7:10AM Sep 25, 2023Observed: 1.21 ft at 8:10AM Sep 25, 2023Observed: 1.21 ft at 9:10AM Sep 25, 2023Observed: 1.21 ft at 10:10AM Sep 25, 2023Observed: 1.12 ft at 12:10AM Sep 26, 2023Observed: 1.12 ft at 1:10AM Sep 26, 2023Observed: 1.12 ft at 2:10AM Sep 26, 2023Observed: 1.12 ft at 3:10AM Sep 26, 2023Observed: 1.12 ft at 4:10AM Sep 26, 2023Observed: 1.11 ft at 5:10AM Sep 26, 2023Observed: 1.11 ft at 6:10AM Sep 26, 2023Observed: 1.1 ft at 7:10AM Sep 26, 2023Observed: 1.11 ft at 8:10AM Sep 26, 2023Observed: 1.13 ft at 9:10AM Sep 26, 2023Observed: 1.13 ft at 10:10AM Sep 26, 2023Observed: 1.13 ft at 11:10AM Sep 26, 2023Observed: 1.13 ft at 12:10PM Sep 26, 2023Observed: 1.12 ft at 1:10PM Sep 26, 2023Observed: 1.12 ft at 2:10PM Sep 26, 2023Observed: 1.12 ft at 3:10PM Sep 26, 2023Observed: 1.11 ft at 4:10PM Sep 26, 2023Observed: 1.11 ft at 5:10PM Sep 26, 2023Observed: 1.1 ft at 6:10PM Sep 26, 2023Observed: 1.1 ft at 8:10PM Sep 26, 2023Observed: 1.1 ft at 9:10PM Sep 26, 2023Observed: 1.1 ft at 10:10PM Sep 26, 2023Observed: 1.1 ft at 11:10PM Sep 26, 2023Observed: 1.1 ft at 12:10AM Sep 27, 2023Observed: 1.09 ft at 1:10AM Sep 27, 2023Observed: 1.09 ft at 2:10AM Sep 27, 2023Observed: 1.09 ft at 3:10AM Sep 27, 2023Observed: 1.09 ft at 4:10AM Sep 27, 2023Observed: 1.08 ft at 5:10AM Sep 27, 2023Observed: 1.08 ft at 6:10AM Sep 27, 2023Observed: 1.07 ft at 7:10AM Sep 27, 2023Observed: 1.07 ft at 8:10AM Sep 27, 2023Observed: 1.06 ft at 9:10AM Sep 27, 2023Observed: 1.07 ft at 10:10AM Sep 27, 2023Observed: 1.07 ft at 11:10AM Sep 27, 2023Observed: 1.07 ft at 12:10PM Sep 27, 2023Observed: 1.05 ft at 7:10PM Sep 27, 2023Observed: 1.05 ft at 8:10PM Sep 27, 2023Observed: 1.04 ft at 9:10PM Sep 27, 2023Observed: 1.04 ft at 10:10PM Sep 27, 2023Observed: 1.04 ft at 11:10PM Sep 27, 2023Observed: 1.03 ft at 12:10AM Sep 28, 2023Observed: 1.03 ft at 1:10AM Sep 28, 2023Observed: 1.03 ft at 2:10AM Sep 28, 2023Observed: 1.03 ft at 3:10AM Sep 28, 2023Observed: 1.03 ft at 4:10AM Sep 28, 2023Observed: 1.02 ft at 5:10AM Sep 28, 2023Observed: 1.02 ft at 6:10AM Sep 28, 2023FLBV2(plotting HGIRR) Graph Created (6:41AM Sep 28, 2023)ObservedLatest observed value: 1.02 ft at 6:10 AM EDT 28-Sep-2023.
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Tabular Data (UTC)
Tabular Data (EDT)
XML Data
RSS Files
Datum: Not Available
Metadata
NOTE: Forecasts are not available for the Flat Branch at Lomond Drive. Only observed stages are available for this point.
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Flood Categories (in feet)
Not Available

Historic Crests
Currently none available.

Recent Crests
Currently none available.

Low Water Records
Currently none available.
Zoom Level:16
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Gauge LocationGauge Map Marker
 Disclaimer
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.
About This Location Collapse

Latitude: 38.781900° N, Longitude: 77.487000° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame		 Gauge Height Flood Stage Uses
NWS stage 0 ft Not Available Interpreting hydrographs and NWS watch, warnings, and forecasts, and inundation maps
Vertical Datum Elevation
(gauge height = 0)		 Elevation
(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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The National Weather Service prepares its forecasts and other services in collaboration with agencies like the US Geological Survey, US Bureau of Reclamation, US Army Corps of Engineers, Natural Resource Conservation Service, National Park Service, ALERT Users Group, Bureau of Indian Affairs, and many state and local emergency managers across the country. For details, please click here.
NWS Information
National Weather Service
(Baltimore/Washington) Sterling Weather Forecast Office
43858 Weather Service Rd.
Sterling, VA 20166
(571) 888-3500
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