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Visit for access to new EXPERIMENTAL products and services from the National Water Center: National Hydrologic Discussion, Area Hydrologic Discussion, Flood Hazard Outlook and the National Water Center Visualization Services, a suite of geospatial services depicting River Forecast Center and National Water Model information.

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Hydrograph River at a Glance Download
Roanoke River at Smith Mountain Lake Pool (ft)Observed: 794.28 ft at 11:58PM Nov 18, 2022Observed: 794.28 ft at 7:00AM Nov 19, 2022Observed: 794.54 ft at 11:58PM Nov 19, 2022Observed: 794.54 ft at 7:00AM Nov 20, 2022Observed: 793.96 ft at 7:00AM Nov 21, 2022Observed: 794.02 ft at 11:58PM Nov 21, 2022Observed: 794.02 ft at 7:00AM Nov 22, 2022Observed: 794.07 ft at 7:00AM Nov 23, 2022Observed: 793.61 ft at 7:00AM Nov 24, 2022Observed: 793.98 ft at 7:00AM Nov 25, 2022Highest Observation: 794.95 ft at 7:00AM Nov 26, 2022Observed: 794.4 ft at 7:00AM Nov 28, 2022SMIV2(plotting HPIRZ) Graph Created (12:35PM Nov 28, 2022)ObservedLatest observed value: 794.4 ft at 7:00 AM EST 28-Nov-2022. Flood Stage is 797 ft
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Tabular Data (UTC)
Tabular Data (EST)
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Datum: Not Available
NOTE: Forecasts are not available for the Roanoke River at Smith Mountain Lake. Only observed stages are available for this point.
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Upstream Gauge - at Niagara Upstream Gauge Downstream Gauge Downstream Gauge - at Altavista
Flood Categories (in feet)
Major Flood Stage: 799
Moderate Flood Stage: 798
Flood Stage: 797
Action Stage: 796
Low Stage (in feet): 0

Historic Crests
(1) 799.79 ft on 04/27/1978
(2) 799.53 ft on 04/17/1987
(3) 799.50 ft on 11/05/1985
(4) 797.46 ft on 04/22/1992
(5) 797.42 ft on 09/29/2004
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(P): Preliminary values subject to further review.

Recent Crests
(1) 797.42 ft on 09/29/2004
(2) 796.56 ft on 09/07/1996
(3) 797.46 ft on 04/22/1992
(4) 799.53 ft on 04/17/1987
(5) 799.50 ft on 11/05/1985
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(P): Preliminary values subject to further review.

Low Water Records
Currently none available.
Zoom Level:16
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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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Latitude: 37.020000° N, Longitude: 79.530000° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft 797 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
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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
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