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Hydrograph River at a Glance Download
Fortymile River at West Fork Stage (ft)Observed: 7.27 ft at 11:05AM May 15, 2024Observed: 7.24 ft at 1:05PM May 15, 2024Observed: 7.22 ft at 2:17PM May 15, 2024Observed: 7.27 ft at 3:05PM May 15, 2024Observed: 7.34 ft at 4:05PM May 15, 2024Observed: 7.31 ft at 5:05PM May 15, 2024Observed: 7.36 ft at 6:05PM May 15, 2024Observed: 7.38 ft at 7:05PM May 15, 2024Observed: 7.36 ft at 8:05PM May 15, 2024Observed: 7.37 ft at 9:05PM May 15, 2024Observed: 7.31 ft at 10:05PM May 15, 2024Observed: 7.28 ft at 11:04PM May 15, 2024Observed: 7.3 ft at 12:29AM May 16, 2024Observed: 7.36 ft at 1:25AM May 16, 2024Observed: 7.31 ft at 2:05AM May 16, 2024Highest Observation: 7.4 ft at 3:05AM May 16, 2024Observed: 7.39 ft at 4:05AM May 16, 2024Highest Observation: 7.4 ft at 5:05AM May 16, 2024Observed: 7.36 ft at 6:11AM May 16, 2024Observed: 7.15 ft at 7:05AM May 16, 2024Observed: 7.12 ft at 8:05AM May 16, 2024Observed: 7.2 ft at 9:05AM May 16, 2024Observed: 7.19 ft at 11:11AM May 16, 2024Observed: 7.21 ft at 12:05PM May 16, 2024Observed: 7.17 ft at 1:04PM May 16, 2024Observed: 7.17 ft at 2:12PM May 16, 2024Observed: 7.17 ft at 3:05PM May 16, 2024Observed: 7.16 ft at 4:05PM May 16, 2024Observed: 7.24 ft at 5:05PM May 16, 2024Observed: 7.24 ft at 6:05PM May 16, 2024Observed: 7.22 ft at 7:05PM May 16, 2024Observed: 7.15 ft at 8:05PM May 16, 2024Observed: 7.15 ft at 9:06PM May 16, 2024Observed: 7.11 ft at 10:12PM May 16, 2024Observed: 7.14 ft at 11:12PM May 16, 2024Observed: 7.15 ft at 12:05AM May 17, 2024Observed: 7.17 ft at 2:07AM May 17, 2024Observed: 7.11 ft at 3:05AM May 17, 2024Observed: 7.13 ft at 4:04AM May 17, 2024Observed: 7.18 ft at 5:05AM May 17, 2024Observed: 7.16 ft at 6:05AM May 17, 2024Observed: 7.05 ft at 7:16AM May 17, 2024Observed: 7.05 ft at 8:05AM May 17, 2024Observed: 7.04 ft at 9:04AM May 17, 2024Observed: 7 ft at 10:05AM May 17, 2024Observed: 7.03 ft at 11:05AM May 17, 2024Observed: 7 ft at 12:11PM May 17, 2024Observed: 6.95 ft at 1:05PM May 17, 2024Observed: 6.91 ft at 2:05PM May 17, 2024Observed: 6.96 ft at 3:18PM May 17, 2024Observed: 7 ft at 4:05PM May 17, 2024Observed: 6.95 ft at 5:05PM May 17, 2024Observed: 6.99 ft at 6:05PM May 17, 2024Observed: 6.97 ft at 7:04PM May 17, 2024Observed: 6.96 ft at 8:05PM May 17, 2024Observed: 6.96 ft at 9:05PM May 17, 2024Observed: 6.92 ft at 10:05PM May 17, 2024Observed: 6.86 ft at 11:11PM May 17, 2024Observed: 6.89 ft at 12:24AM May 18, 2024Observed: 6.9 ft at 2:11AM May 18, 2024Observed: 6.91 ft at 3:29AM May 18, 2024Observed: 6.9 ft at 4:16AM May 18, 2024Observed: 6.93 ft at 5:30AM May 18, 2024Observed: 6.86 ft at 6:12AM May 18, 2024Observed: 6.77 ft at 7:05AM May 18, 2024Observed: 6.77 ft at 8:05AM May 18, 2024Observed: 6.81 ft at 9:05AM May 18, 2024Observed: 6.84 ft at 10:17AM May 18, 2024Observed: 6.8 ft at 11:05AM May 18, 2024Observed: 6.78 ft at 12:04PM May 18, 2024Observed: 6.73 ft at 1:04PM May 18, 2024Observed: 6.71 ft at 2:18PM May 18, 2024Observed: 6.71 ft at 3:11PM May 18, 2024Observed: 6.74 ft at 4:11PM May 18, 2024Observed: 6.75 ft at 5:05PM May 18, 2024Observed: 6.74 ft at 6:04PM May 18, 2024Observed: 6.75 ft at 7:04PM May 18, 2024Observed: 6.71 ft at 8:05PM May 18, 2024Observed: 6.7 ft at 9:05PM May 18, 2024Observed: 6.65 ft at 10:04PM May 18, 2024Observed: 6.67 ft at 11:05PM May 18, 2024Observed: 6.68 ft at 12:04AM May 19, 2024Observed: 6.7 ft at 2:48AM May 19, 2024Observed: 6.71 ft at 3:16AM May 19, 2024Observed: 6.68 ft at 4:05AM May 19, 2024Observed: 6.73 ft at 5:05AM May 19, 2024Observed: 6.69 ft at 6:24AM May 19, 2024Observed: 6.52 ft at 7:04AM May 19, 2024Observed: 6.66 ft at 8:05AM May 19, 2024Observed: 6.65 ft at 9:04AM May 19, 2024Observed: 6.67 ft at 10:05AM May 19, 2024Observed: 6.61 ft at 11:04AM May 19, 2024Observed: 6.63 ft at 12:04PM May 19, 2024Observed: 6.61 ft at 1:05PM May 19, 2024Observed: 6.65 ft at 2:05PM May 19, 2024Observed: 6.64 ft at 3:05PM May 19, 2024Observed: 6.63 ft at 4:05PM May 19, 2024Observed: 6.61 ft at 5:05PM May 19, 2024Observed: 6.58 ft at 6:04PM May 19, 2024Observed: 6.58 ft at 7:05PM May 19, 2024Observed: 6.62 ft at 8:05PM May 19, 2024Observed: 6.56 ft at 9:05PM May 19, 2024Observed: 6.55 ft at 10:04PM May 19, 2024Observed: 6.56 ft at 11:10PM May 19, 2024Observed: 6.54 ft at 1:38AM May 20, 2024Observed: 6.61 ft at 2:05AM May 20, 2024Observed: 6.55 ft at 3:17AM May 20, 2024Observed: 6.58 ft at 4:04AM May 20, 2024Observed: 6.59 ft at 6:31AM May 20, 2024Observed: 6.55 ft at 7:11AM May 20, 2024Observed: 6.47 ft at 8:05AM May 20, 2024Observed: 6.46 ft at 9:04AM May 20, 2024Observed: 6.46 ft at 10:05AM May 20, 2024Observed: 6.45 ft at 11:04AM May 20, 2024Observed: 6.46 ft at 12:04PM May 20, 2024Observed: 6.42 ft at 1:05PM May 20, 2024Observed: 6.41 ft at 2:05PM May 20, 2024Observed: 6.43 ft at 3:05PM May 20, 2024Observed: 6.43 ft at 4:04PM May 20, 2024Observed: 6.44 ft at 5:04PM May 20, 2024Observed: 6.45 ft at 6:04PM May 20, 2024Observed: 6.46 ft at 7:04PM May 20, 2024Observed: 6.46 ft at 8:05PM May 20, 2024Observed: 6.44 ft at 9:05PM May 20, 2024Observed: 6.44 ft at 10:11PM May 20, 2024Observed: 6.46 ft at 11:29PM May 20, 2024Observed: 6.4 ft at 12:11AM May 21, 2024Observed: 6.4 ft at 1:49AM May 21, 2024Observed: 6.41 ft at 2:05AM May 21, 2024Observed: 6.41 ft at 3:04AM May 21, 2024Observed: 6.46 ft at 4:05AM May 21, 2024Observed: 6.42 ft at 5:05AM May 21, 2024Observed: 6.35 ft at 6:11AM May 21, 2024Observed: 6.3 ft at 7:04AM May 21, 2024Observed: 6.29 ft at 8:04AM May 21, 2024Observed: 6.38 ft at 9:05AM May 21, 2024Observed: 6.37 ft at 10:04AM May 21, 2024Observed: 6.33 ft at 11:17AM May 21, 2024Observed: 6.34 ft at 12:04PM May 21, 2024Observed: 6.36 ft at 1:05PM May 21, 2024Observed: 6.29 ft at 2:11PM May 21, 2024Observed: 6.32 ft at 3:04PM May 21, 2024Observed: 6.34 ft at 4:11PM May 21, 2024Observed: 6.36 ft at 5:04PM May 21, 2024Observed: 6.37 ft at 6:05PM May 21, 2024Observed: 6.36 ft at 7:04PM May 21, 2024Observed: 6.37 ft at 8:04PM May 21, 2024Observed: 6.36 ft at 9:04PM May 21, 2024Observed: 6.39 ft at 10:04PM May 21, 2024Observed: 6.39 ft at 11:04PM May 21, 2024Observed: 6.36 ft at 12:11AM May 22, 2024Observed: 6.31 ft at 2:04AM May 22, 2024Observed: 6.35 ft at 3:17AM May 22, 2024Observed: 6.36 ft at 4:04AM May 22, 2024Observed: 6.36 ft at 6:01AM May 22, 2024Observed: 6.35 ft at 6:20AM May 22, 2024Observed: 6.24 ft at 7:04AM May 22, 2024Observed: 6.36 ft at 8:05AM May 22, 2024Observed: 6.36 ft at 9:04AM May 22, 2024Observed: 6.36 ft at 10:04AM May 22, 2024Forecast: 6.43 ft 4:00PM May 22, 2024Forecast: 6.47 ft 10:00PM May 22, 2024Forecast: 6.49 ft 4:00AM May 23, 2024Forecast: 6.52 ft 10:00AM May 23, 2024Forecast: 6.58 ft 4:00PM May 23, 2024Forecast: 6.68 ft 10:00PM May 23, 2024Forecast: 6.84 ft 4:00AM May 24, 2024Forecast: 7.05 ft 10:00AM May 24, 2024Highest Forecast: 7.23 ft 4:00PM May 24, 2024FMWA2(plotting HGIRZ) Graph Created (10:47AM May 22, 2024)ObservedForecast (issued 9:45AM May 22)Latest observed value: 6.36 ft at 10:04 AM AKDT 22-May-2024. Flood Stage is 21 ft
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About this graph
Tabular Data (UTC)
Tabular Data (AKDT)
XML Data
RSS Files
Datum: Not Available
Metadata
NOTE: NWS gage operated on a seasonal basis. No data available during winter months.

NOTE: Gage data do not meet the quality standards of USGS gages.

NOTE: Forecasts are not available for the Fortymile River at West Fork. Only observed stages are available for this point.

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Upstream Gauge - at Mosquito Fork Upstream Gauge Downstream Gauge Downstream Gauge - at South Fork
Flood Categories (in feet)
Major Flood Stage: 0
Moderate Flood Stage: 0
Flood Stage: 21
Action Stage: 12
Low Stage (in feet): -9999

Historic Crests

(P): Preliminary values subject to further review.

Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
Currently none available.
Zoom Level:6
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.
Flood Impacts & Photos Collapse
If you notice any errors in the below information, please contact our Webmaster
21 low spot in approach from the south to the bridge near the campground becomes flooded.
12 bankfull stage.
Photos
(1) Bridge
(2) Downstream
(3) Upstream
(4) Fortymile River at West Fork looking downstream, Stage = 7.15 ft
About This Location Collapse

Latitude: 63.889444° N, Longitude: 142.232222° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS stage 0 ft 21 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 1828.59 ft 1849.59 ft 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
Long-term Hydrograph
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
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: 2-Nov-2020 7:26 PM
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