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Hydrograph River at a Glance Download
Koyukuk River at Hughes Stage (ft)GLTA2 Graph Created (4:32AM Apr 14, 2024)Flood Stage is 8 ft
About this graph
Tabular Data (UTC)
Tabular Data (AKDT)
XML Data
RSS Files
Datum: Not Available
NOTE: Stage may be affected by ice.

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

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Upstream Gauge - at Allakaket Upstream Gauge Downstream Gauge Downstream Gauge - at Huslia
Flood Categories (in feet)
Major Flood Stage: 70
Moderate Flood Stage: 67
Flood Stage: 64
Action Stage: 62
Low Stage (in feet): -9999

Historic Crests
(1) 71.80 ft on 08/22/1994
(2) 62.66 ft on 05/18/2005
(3) 58.34 ft on 08/03/2003
(4) 57.33 ft on 05/28/2004
(5) 57.29 ft on 05/18/2006
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 51.24 ft on 05/30/2007
(2) 57.29 ft on 05/18/2006
(3) 62.66 ft on 05/18/2005
(4) 57.33 ft on 05/28/2004
(5) 58.34 ft on 08/03/2003
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
Currently none available.
Zoom Level:10
KML Image
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.
Flood Impacts & Photos Collapse
If you notice any errors in the below information, please contact our Webmaster
70 Major flood stage.
69.8 Water enters water treatment plant. Door sill of clinic, washeteria.
68.8 Floor of city office/post office begins to flood.
67.2 Water surrounds school and flooding of the school begins.
67 Moderate flood stage.
65.7 Floor of generator.
64.5 Water starts to go over tank Farm Berm.
64 WATER BEGINS TO GO OVER TOP OF BANK. Minor flood stage.
(1) Upstream
(2) Overview
(3) COE stafff
(4) Downstream
About This Location Collapse

Latitude: 66.045556° N, Longitude: 154.261667° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft 64 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
Other 250 ft 314 ft  

Current/Historical Observations:

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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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