Skip Navigation Link weather.gov  
NOAA logo - Click to go to the NOAA homepage National Weather Service NWS logo - Click to go to the NWS homepage
Advanced Hydrologic Prediction Service
Image background of Navigation bar Left
Bookmark and Share Navigation Bar End Cap

  
 

Web Portal Changes:

Please visit https://www.weather.gov/owp/operations for more information.



Hydrograph River at a Glance Download
Roanoke River at Smith Mountain Lake Pool (ft)Highest Observation: 794.44 ft at 11:58PM Mar 18, 2024Observed: 794.09 ft at 7:00AM Mar 19, 2024Observed: 794.24 ft at 7:00AM Mar 20, 2024Observed: 794.21 ft at 11:58PM Mar 20, 2024Observed: 794.21 ft at 7:00AM Mar 21, 2024Observed: 794.14 ft at 11:58PM Mar 21, 2024Observed: 794.14 ft at 7:00AM Mar 22, 2024Observed: 794.16 ft at 11:58PM Mar 22, 2024Observed: 794.16 ft at 7:00AM Mar 23, 2024Observed: 793.92 ft at 11:58PM Mar 23, 2024Observed: 793.92 ft at 7:00AM Mar 24, 2024Observed: 794.1 ft at 7:00AM Mar 25, 2024Observed: 794.14 ft at 11:58PM Mar 25, 2024Observed: 794.14 ft at 7:00AM Mar 26, 2024Observed: 794.08 ft at 11:58PM Mar 26, 2024Observed: 794.08 ft at 7:00AM Mar 27, 2024Observed: 793.85 ft at 11:58PM Mar 27, 2024Observed: 793.85 ft at 7:00AM Mar 28, 2024SMIV2(plotting HPIRZ) Graph Created (1:05PM Mar 28, 2024)ObservedLatest observed value: 793.85 ft at 7:00 AM EDT 28-Mar-2024. Flood Stage is 797 ft
Printable Image
About this graph
Tabular Data (UTC)
Tabular Data (EDT)
XML Data
RSS Files
Datum: Not Available
Metadata
NOTE: Forecasts are not available for the Roanoke River at Smith Mountain Lake. Only observed stages are available for this point.
Return to Area Map
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
Show More Historic Crests

(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
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
Currently none available.
Zoom Level:16
KML Image
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: 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)
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 NULL NULL  
Additional Information Collapse

Gage Photos

Gage Photo

Resources Collapse
Hydrologic Resources Additional Resources
Collaborative Agencies Collapse
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
Blacksburg Weather Forecast Office
1750 Forecast Drive
Blacksburg, VA 24060
(540) 553-8900
Ask Questions/Webmaster
Page last modified: 2-Nov-2020 7:30 PM
Disclaimer
Credits
Glossary
Privacy Policy
About Us
Career Opportunities