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Web Portal Changes: The Advanced Hydrologic Prediction Service (AHPS) hosted at 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.

Experimental National Water Center Products: Flood Inundation Mapping services are now available for 10% of the U.S. population. Please visit for more information. The National Hydrologic Discussion, Area Hydrologic Discussion, Flood Hazard Outlook, and real-time geospatial services depicting River Forecast Center and National Water Model forecasts, continue to be accessible via the URL above, as described in the StoryMap here.

Hydrograph River at a Glance Download
South Fork Holston River above South Holston Dam Pool (ft)Highest Observation: 1723.26 ft at 11:00PM Sep 24, 2023Observed: 1723.25 ft at 12:00AM Sep 25, 2023Observed: 1723.24 ft at 1:00AM Sep 25, 2023Observed: 1723.23 ft at 2:00AM Sep 25, 2023Observed: 1723.22 ft at 3:00AM Sep 25, 2023Observed: 1723.2 ft at 4:00AM Sep 25, 2023Observed: 1723.19 ft at 5:00AM Sep 25, 2023Observed: 1723.17 ft at 6:00AM Sep 25, 2023Observed: 1723.16 ft at 7:00AM Sep 25, 2023Observed: 1723.15 ft at 8:00AM Sep 25, 2023Observed: 1723.13 ft at 9:00AM Sep 25, 2023Observed: 1723.11 ft at 10:00AM Sep 25, 2023Observed: 1723.11 ft at 11:00AM Sep 25, 2023Observed: 1723.1 ft at 12:00PM Sep 25, 2023Observed: 1723.08 ft at 1:00PM Sep 25, 2023Observed: 1723.07 ft at 2:00PM Sep 25, 2023Observed: 1723.06 ft at 3:00PM Sep 25, 2023Observed: 1723.04 ft at 4:00PM Sep 25, 2023Observed: 1723.04 ft at 5:00PM Sep 25, 2023Observed: 1723.03 ft at 6:00PM Sep 25, 2023Observed: 1723.02 ft at 7:00PM Sep 25, 2023Observed: 1723 ft at 8:00PM Sep 25, 2023Observed: 1723 ft at 9:00PM Sep 25, 2023Observed: 1722.99 ft at 10:00PM Sep 25, 2023Observed: 1722.97 ft at 11:00PM Sep 25, 2023Observed: 1722.96 ft at 12:00AM Sep 26, 2023Observed: 1722.95 ft at 1:00AM Sep 26, 2023Observed: 1722.94 ft at 2:00AM Sep 26, 2023Observed: 1722.92 ft at 3:00AM Sep 26, 2023Observed: 1722.91 ft at 4:00AM Sep 26, 2023Observed: 1722.89 ft at 5:00AM Sep 26, 2023Observed: 1722.87 ft at 6:00AM Sep 26, 2023Observed: 1722.86 ft at 7:00AM Sep 26, 2023Observed: 1722.85 ft at 8:00AM Sep 26, 2023Observed: 1722.83 ft at 9:00AM Sep 26, 2023Observed: 1722.82 ft at 10:00AM Sep 26, 2023Observed: 1722.8 ft at 11:00AM Sep 26, 2023Observed: 1722.79 ft at 12:00PM Sep 26, 2023Observed: 1722.78 ft at 1:00PM Sep 26, 2023Observed: 1722.78 ft at 2:00PM Sep 26, 2023Observed: 1722.77 ft at 3:00PM Sep 26, 2023Observed: 1722.76 ft at 4:00PM Sep 26, 2023Observed: 1722.75 ft at 5:00PM Sep 26, 2023Observed: 1722.74 ft at 6:00PM Sep 26, 2023Observed: 1722.73 ft at 7:00PM Sep 26, 2023Observed: 1722.73 ft at 8:00PM Sep 26, 2023Observed: 1722.72 ft at 9:00PM Sep 26, 2023Observed: 1722.7 ft at 10:00PM Sep 26, 2023Observed: 1722.7 ft at 11:00PM Sep 26, 2023Observed: 1722.68 ft at 12:00AM Sep 27, 2023Observed: 1722.68 ft at 1:00AM Sep 27, 2023Observed: 1722.66 ft at 2:00AM Sep 27, 2023Observed: 1722.65 ft at 3:00AM Sep 27, 2023Observed: 1722.64 ft at 4:00AM Sep 27, 2023Observed: 1722.62 ft at 5:00AM Sep 27, 2023Observed: 1722.6 ft at 6:00AM Sep 27, 2023Observed: 1722.59 ft at 7:00AM Sep 27, 2023Observed: 1722.58 ft at 8:00AM Sep 27, 2023Observed: 1722.56 ft at 9:00AM Sep 27, 2023Observed: 1722.54 ft at 10:00AM Sep 27, 2023Observed: 1722.54 ft at 11:00AM Sep 27, 2023Observed: 1722.52 ft at 12:00PM Sep 27, 2023Observed: 1722.51 ft at 1:00PM Sep 27, 2023Observed: 1722.5 ft at 2:00PM Sep 27, 2023Observed: 1722.49 ft at 3:00PM Sep 27, 2023Observed: 1722.48 ft at 4:00PM Sep 27, 2023Observed: 1722.47 ft at 5:00PM Sep 27, 2023Observed: 1722.46 ft at 6:00PM Sep 27, 2023Observed: 1722.45 ft at 7:00PM Sep 27, 2023Observed: 1722.43 ft at 8:00PM Sep 27, 2023Observed: 1722.43 ft at 9:00PM Sep 27, 2023Observed: 1722.43 ft at 10:00PM Sep 27, 2023Observed: 1722.41 ft at 11:00PM Sep 27, 2023Observed: 1722.39 ft at 12:00AM Sep 28, 2023Observed: 1722.39 ft at 1:00AM Sep 28, 2023Observed: 1722.37 ft at 2:00AM Sep 28, 2023Observed: 1722.35 ft at 3:00AM Sep 28, 2023Observed: 1722.33 ft at 4:00AM Sep 28, 2023Observed: 1722.32 ft at 5:00AM Sep 28, 2023Observed: 1722.3 ft at 6:00AM Sep 28, 2023Observed: 1722.28 ft at 7:00AM Sep 28, 2023Observed: 1722.26 ft at 8:00AM Sep 28, 2023Observed: 1722.26 ft at 9:00AM Sep 28, 2023Observed: 1722.23 ft at 10:00AM Sep 28, 2023Observed: 1722.22 ft at 11:00AM Sep 28, 2023Observed: 1722.22 ft at 12:00PM Sep 28, 2023Observed: 1722.2 ft at 1:00PM Sep 28, 2023Observed: 1722.18 ft at 2:00PM Sep 28, 2023Observed: 1722.18 ft at 3:00PM Sep 28, 2023Observed: 1722.16 ft at 4:00PM Sep 28, 2023Observed: 1722.14 ft at 5:00PM Sep 28, 2023Observed: 1722.14 ft at 6:00PM Sep 28, 2023Observed: 1722.13 ft at 7:00PM Sep 28, 2023Observed: 1722.11 ft at 8:00PM Sep 28, 2023Observed: 1722.1 ft at 9:00PM Sep 28, 2023Observed: 1722.1 ft at 10:00PM Sep 28, 2023Observed: 1722.08 ft at 11:00PM Sep 28, 2023Observed: 1722.06 ft at 12:00AM Sep 29, 2023Observed: 1722.06 ft at 1:00AM Sep 29, 2023Observed: 1722.05 ft at 2:00AM Sep 29, 2023Observed: 1722.03 ft at 3:00AM Sep 29, 2023Observed: 1722.01 ft at 4:00AM Sep 29, 2023Observed: 1722.01 ft at 5:00AM Sep 29, 2023Observed: 1721.99 ft at 6:00AM Sep 29, 2023Observed: 1721.97 ft at 7:00AM Sep 29, 2023Observed: 1721.96 ft at 8:00AM Sep 29, 2023Observed: 1721.95 ft at 9:00AM Sep 29, 2023Observed: 1721.93 ft at 10:00AM Sep 29, 2023Observed: 1721.91 ft at 11:00AM Sep 29, 2023Observed: 1721.9 ft at 12:00PM Sep 29, 2023Observed: 1721.89 ft at 1:00PM Sep 29, 2023Observed: 1721.88 ft at 2:00PM Sep 29, 2023Observed: 1721.87 ft at 3:00PM Sep 29, 2023Observed: 1721.86 ft at 4:00PM Sep 29, 2023Observed: 1721.85 ft at 5:00PM Sep 29, 2023Observed: 1721.84 ft at 6:00PM Sep 29, 2023Observed: 1721.83 ft at 7:00PM Sep 29, 2023Observed: 1721.82 ft at 8:00PM Sep 29, 2023Observed: 1721.81 ft at 9:00PM Sep 29, 2023Observed: 1721.8 ft at 10:00PM Sep 29, 2023Highest Forecast: 1721.73 ft 1:00AM Sep 30, 2023Forecast: 1721.65 ft 7:00AM Sep 30, 2023Forecast: 1721.57 ft 1:00PM Sep 30, 2023Forecast: 1721.48 ft 7:00PM Sep 30, 2023Forecast: 1721.4 ft 1:00AM Oct 01, 2023Forecast: 1721.32 ft 7:00AM Oct 01, 2023Forecast: 1721.24 ft 1:00PM Oct 01, 2023Forecast: 1721.15 ft 7:00PM Oct 01, 2023Forecast: 1721.07 ft 1:00AM Oct 02, 2023Forecast: 1720.99 ft 7:00AM Oct 02, 2023Forecast: 1720.9 ft 1:00PM Oct 02, 2023Forecast: 1720.82 ft 7:00PM Oct 02, 2023TVA Forecast for South Holston DamSHDT1(plotting HPIRZ) Graph Created (10:45PM Sep 29, 2023)ObservedForecast (issued 12:39PM Sep 29)Latest observed value: 1721.8 ft at 10:00 PM EDT 29-Sep-2023.
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About this graph
Tabular Data (UTC)
Tabular Data (EDT)
XML Data
RSS Files
Datum: Not Available
Reliability of the Forecast: Based on current and forecast river, weather and reservoir conditions

NOTE: Forecasts for the South Fork Holston River above South Holston Dam are issued routinely year-round.

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Flood Categories (in feet)
Major Flood Stage: 0
Moderate Flood Stage: 0
Flood Stage: 0
Action Stage: 0
Low Stage (in feet): 0

Historic Crests
Currently none available.

Recent Crests
Currently none available.

Low Water Records
Currently none available.

For more information on your flood risk go to

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Gauge LocationGauge Map Marker
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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If you notice any errors in the below information, please contact our Webmaster
1684 ft Municipal and industrial water intakes could experience operational issues below this elevation.
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Latitude: 36.520278° N, Longitude: 82.095556° 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)
(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  
Additional Information Collapse
For additional information, see: TVA Forecast for South Holston Dam
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
Morristown Weather Forecast Office
5974 Commerce Blvd.
Morristown, TN 37814
(423) 586-3771
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