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Hydrograph River at a Glance Download
Koyukuk River at South Fork Stage (ft)Observed: 24.97 ft at 8:21PM May 19, 2022Observed: 25.02 ft at 10:32PM May 19, 2022Observed: 25.14 ft at 3:32AM May 20, 2022Observed: 25.17 ft at 5:41AM May 20, 2022Observed: 24.72 ft at 7:49AM May 20, 2022Observed: 25.23 ft at 9:58AM May 20, 2022Observed: 25.17 ft at 12:07PM May 20, 2022Observed: 25.24 ft at 2:17PM May 20, 2022Observed: 25.22 ft at 4:28PM May 20, 2022Observed: 25.18 ft at 6:38PM May 20, 2022Observed: 25.25 ft at 8:49PM May 20, 2022Observed: 25.5 ft at 11:00PM May 20, 2022Observed: 25.63 ft at 3:20AM May 21, 2022Observed: 25.76 ft at 5:28AM May 21, 2022Observed: 25.87 ft at 7:37AM May 21, 2022Observed: 25.77 ft at 9:46AM May 21, 2022Observed: 25.7 ft at 11:55AM May 21, 2022Observed: 25.67 ft at 2:05PM May 21, 2022Observed: 25.63 ft at 4:15PM May 21, 2022Observed: 25.58 ft at 6:26PM May 21, 2022Observed: 25.53 ft at 8:38PM May 21, 2022Observed: 25.6 ft at 10:49PM May 21, 2022Highest Observation: 25.88 ft at 12:58AM May 22, 2022Observed: 25.78 ft at 3:06AM May 22, 2022Observed: 25.82 ft at 5:15AM May 22, 2022Observed: 25.8 ft at 7:24AM May 22, 2022Observed: 25.72 ft at 9:33AM May 22, 2022Observed: 25.62 ft at 11:42AM May 22, 2022Observed: 25.54 ft at 1:52PM May 22, 2022Observed: 25.52 ft at 4:01PM May 22, 2022Observed: 25.47 ft at 6:11PM May 22, 2022Observed: 25.42 ft at 8:22PM May 22, 2022Observed: 25.43 ft at 10:31PM May 22, 2022Observed: 25.46 ft at 12:41AM May 23, 2022Observed: 25.46 ft at 2:50AM May 23, 2022Observed: 25.53 ft at 4:59AM May 23, 2022Observed: 25.51 ft at 7:08AM May 23, 2022Observed: 25.47 ft at 9:17AM May 23, 2022Observed: 25.35 ft at 11:26AM May 23, 2022Observed: 25.32 ft at 1:36PM May 23, 2022Observed: 25.25 ft at 3:45PM May 23, 2022Observed: 25.18 ft at 5:03PM May 23, 2022Observed: 25.13 ft at 7:14PM May 23, 2022Observed: 24.96 ft at 9:25PM May 23, 2022Observed: 24.98 ft at 10:01PM May 23, 2022Observed: 25.07 ft at 1:03AM May 24, 2022Observed: 25.11 ft at 3:11AM May 24, 2022Observed: 25.12 ft at 5:20AM May 24, 2022Observed: 25.18 ft at 7:28AM May 24, 2022Observed: 25.12 ft at 9:37AM May 24, 2022Observed: 25.08 ft at 11:46AM May 24, 2022Observed: 24.99 ft at 1:56PM May 24, 2022Observed: 24.95 ft at 4:06PM May 24, 2022Observed: 24.92 ft at 6:16PM May 24, 2022Observed: 24.87 ft at 8:26PM May 24, 2022Observed: 24.92 ft at 10:36PM May 24, 2022Observed: 24.87 ft at 12:46AM May 25, 2022Observed: 24.9 ft at 2:56AM May 25, 2022Observed: 24.97 ft at 6:23AM May 25, 2022Observed: 25.08 ft at 8:32AM May 25, 2022Observed: 25 ft at 10:41AM May 25, 2022Observed: 24.97 ft at 12:51PM May 25, 2022Observed: 24.95 ft at 3:00PM May 25, 2022Observed: 24.94 ft at 5:10PM May 25, 2022Observed: 24.83 ft at 7:21PM May 25, 2022Observed: 24.9 ft at 9:32PM May 25, 2022Observed: 24.97 ft at 11:41PM May 25, 2022Observed: 24.97 ft at 1:50AM May 26, 2022Observed: 25.17 ft at 5:38AM May 26, 2022Observed: 25.32 ft at 7:47AM May 26, 2022Observed: 25.26 ft at 9:56AM May 26, 2022Observed: 25.25 ft at 12:06PM May 26, 2022Observed: 25.18 ft at 2:15PM May 26, 2022Observed: 25.17 ft at 4:25PM May 26, 2022Observed: 25.1 ft at 6:35PM May 26, 2022SFKA2(plotting HGIRZ) Graph Created (8:17PM May 26, 2022)ObservedLatest observed value: 25.1 ft at 6:35 PM AKDT 26-May-2022.
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Tabular Data (UTC)
Tabular Data (AKDT)
XML Data
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Datum: Not Available
NOTE: Gage data do not meet the quality standards of USGS gages.

NOTE: Stage may be affected by ice.

NOTE: Forecasts are not available for the Koyukuk River at South Fork. 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:14
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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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Latitude: 67.019722° N, Longitude: 150.292778° 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  
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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
Fairbanks Weather Forecast Office
UAF-IARC Bldg. P.O. Box 757345
Fairbanks, AK 99775-7345
(907) 458-3700
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