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Hydrograph River at a Glance Download
Koyukuk River at Bettles Stage (ft)Observed: 18.05 ft at 7:50AM May 24, 2020Observed: 18.21 ft at 6:05PM May 24, 2020Observed: 18.17 ft at 8:00AM May 25, 2020Observed: 18.31 ft at 4:00PM May 25, 2020Observed: 18.12 ft at 7:50AM May 26, 2020Highest Observation: 18.34 ft at 7:40PM May 26, 2020Observed: 18.18 ft at 7:55AM May 27, 2020Observed: 18.18 ft at 6:05PM May 27, 2020Observed: 18.08 ft at 6:00PM May 28, 2020Observed: 17.86 ft at 7:45AM May 29, 2020Observed: 17.8 ft at 5:45PM May 29, 2020Observed: 17.59 ft at 7:00AM May 30, 2020Highest Forecast: 16.82 ft 10:00PM May 30, 2020Forecast: 16.59 ft 4:00AM May 31, 2020Forecast: 16.37 ft 10:00AM May 31, 2020Forecast: 16.13 ft 4:00PM May 31, 2020Forecast: 15.87 ft 10:00PM May 31, 2020Forecast: 15.59 ft 4:00AM Jun 01, 2020Forecast: 15.3 ft 10:00AM Jun 01, 2020Forecast: 14.98 ft 4:00PM Jun 01, 2020Forecast: 14.71 ft 10:00PM Jun 01, 2020BTTA2(plotting HGIRV) Graph Created (4:32PM May 30, 2020)ObservedForecast (issued 1:24PM May 30)Latest observed value: 17.59 ft at 7:00 AM AKDT 30-May-2020. Flood Stage is 33 ft
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Tabular Data (AKDT)
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Datum: Not Available
NOTE: Automated gauge readings are unavailable, readings taken manually.

NOTE: Forecasts for the Koyukuk River at Bettles are issued routinely during the warm season, and as needed at other times of the year.

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Upstream Gauge - near Wiseman Upstream Gauge Downstream Gauge Downstream Gauge - below John River
Flood Categories (in feet)
Major Flood Stage: 37
Moderate Flood Stage: 35
Flood Stage: 33
Action Stage: 24
Low Stage (in feet): -9999

Historic Crests
(1) 19.31 ft on 05/22/2005
(2) 17.06 ft on 07/27/2003
(3) 16.58 ft on 07/18/2006
(4) 16.04 ft on 05/22/2009
(5) 15.85 ft on 05/27/2004
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(P): Preliminary values subject to further review.

Recent Crests
(1) 12.92 ft on 06/22/2010
(2) 16.04 ft on 05/22/2009
(3) 15.36 ft on 05/15/2008
(4) 12.34 ft on 08/11/2007
(5) 16.58 ft on 07/18/2006
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(P): Preliminary values subject to further review.

Low Water Records
Currently none available.
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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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(1) Downstream
(2) Gage
(3) Upstream
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Latitude: 66.926111° N, Longitude: 151.508611° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft 33 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 29 610 ft 643 ft 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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Long-term Hydrograph
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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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Page last modified: 1-Mar-2019 12:31 AM
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