Skip Navigation Link weather.gov  
NOAA logo - Click to go to the NOAA homepage National Weather Service NWS logo - Click to go to the NWS homepage
Advanced Hydrologic Prediction Service
Image background of Navigation bar Left Home News Organization
Bookmark and Share Navigation Bar End Cap

  

National Conditions
    Rivers
    Satellite
    Climate
    Observed Precip

Local Conditions
    Warnings
    Weather Forecast
    Radar

AHPS Documentation
    User Guide
    User Brochure

What is AHPS?
    Facts
    Our Partners

Feedback/Questions
    Provide Feedback
    Ask Questions

When flooded turn around don't drown
FloodSmart
USA.gov Official Web Portal
 

Web Portal Changes:

  • AHPS - water.weather.gov- Scheduled operations ends on Tuesday, May 28th, 2024
  • Please see water.noaa.gov/.  Bookmark it NOW!  The pages will automatically redirect to water.noaa.gov until May 28, 2025.
  • To go to a specific gauge location  - use water.noaa.gov/gauges/NWSLI - where NWSLI is the five character ID of your favorite location.
  • Other Important URL changes - Service Change Notice 24-29 

Please visit https://www.weather.gov/owp/operations for more information.



Hydrograph River at a Glance Download
Fortymile River at West Fork Stage (ft)Highest Observation: 7.62 ft at 4:05AM May 10, 2024Observed: 7.6 ft at 5:05AM May 10, 2024Observed: 7.6 ft at 6:11AM May 10, 2024Observed: 7.53 ft at 7:05AM May 10, 2024Observed: 7.46 ft at 8:05AM May 10, 2024Observed: 7.46 ft at 9:05AM May 10, 2024Observed: 7.42 ft at 10:05AM May 10, 2024Observed: 7.36 ft at 11:05AM May 10, 2024Observed: 7.36 ft at 12:05PM May 10, 2024Observed: 7.28 ft at 1:05PM May 10, 2024Observed: 7.24 ft at 2:06PM May 10, 2024Observed: 7.3 ft at 3:05PM May 10, 2024Observed: 7.27 ft at 4:06PM May 10, 2024Observed: 7.3 ft at 5:05PM May 10, 2024Observed: 7.3 ft at 6:11PM May 10, 2024Observed: 7.26 ft at 7:17PM May 10, 2024Observed: 7.25 ft at 8:05PM May 10, 2024Observed: 7.2 ft at 9:12PM May 10, 2024Observed: 7.15 ft at 10:05PM May 10, 2024Observed: 7.21 ft at 11:05PM May 10, 2024Observed: 7.26 ft at 12:05AM May 11, 2024Observed: 7.15 ft at 1:11AM May 11, 2024Observed: 7.15 ft at 2:05AM May 11, 2024Observed: 7.17 ft at 3:05AM May 11, 2024Observed: 7.16 ft at 4:05AM May 11, 2024Observed: 7.11 ft at 5:05AM May 11, 2024Observed: 7.04 ft at 6:05AM May 11, 2024Observed: 6.98 ft at 7:18AM May 11, 2024Observed: 6.92 ft at 8:05AM May 11, 2024Observed: 7 ft at 9:05AM May 11, 2024Observed: 6.96 ft at 10:05AM May 11, 2024Observed: 6.91 ft at 11:05AM May 11, 2024Observed: 6.91 ft at 12:05PM May 11, 2024Observed: 6.88 ft at 1:05PM May 11, 2024Observed: 6.84 ft at 2:30PM May 11, 2024Observed: 6.89 ft at 3:12PM May 11, 2024Observed: 6.86 ft at 4:05PM May 11, 2024Observed: 6.89 ft at 5:05PM May 11, 2024Observed: 6.89 ft at 6:05PM May 11, 2024Observed: 6.9 ft at 7:05PM May 11, 2024Observed: 6.9 ft at 8:05PM May 11, 2024Observed: 6.9 ft at 9:35PM May 11, 2024Observed: 6.9 ft at 10:05PM May 11, 2024Observed: 6.84 ft at 11:11PM May 11, 2024Observed: 6.87 ft at 12:05AM May 12, 2024Observed: 6.87 ft at 1:05AM May 12, 2024Observed: 6.89 ft at 2:36AM May 12, 2024Observed: 6.86 ft at 3:13AM May 12, 2024Observed: 6.86 ft at 4:30AM May 12, 2024Observed: 6.83 ft at 5:05AM May 12, 2024Observed: 6.82 ft at 7:12AM May 12, 2024Observed: 6.84 ft at 8:05AM May 12, 2024Observed: 6.79 ft at 9:12AM May 12, 2024Observed: 6.75 ft at 11:05AM May 12, 2024Observed: 6.76 ft at 12:05PM May 12, 2024Observed: 6.76 ft at 1:05PM May 12, 2024Observed: 6.75 ft at 3:39PM May 12, 2024Observed: 6.76 ft at 4:24PM May 12, 2024Observed: 6.72 ft at 5:53PM May 12, 2024Observed: 6.75 ft at 6:05PM May 12, 2024Observed: 6.75 ft at 7:05PM May 12, 2024Observed: 6.79 ft at 8:05PM May 12, 2024Observed: 6.84 ft at 9:05PM May 12, 2024Observed: 6.87 ft at 10:11PM May 12, 2024Observed: 6.89 ft at 11:05PM May 12, 2024Observed: 6.96 ft at 12:05AM May 13, 2024Observed: 7 ft at 1:05AM May 13, 2024Observed: 7.04 ft at 2:05AM May 13, 2024Observed: 7.11 ft at 3:05AM May 13, 2024Observed: 7.13 ft at 4:05AM May 13, 2024Observed: 7.15 ft at 5:05AM May 13, 2024Observed: 7.19 ft at 6:05AM May 13, 2024Observed: 7.23 ft at 7:05AM May 13, 2024Observed: 7.23 ft at 8:36AM May 13, 2024Observed: 7.21 ft at 10:55AM May 13, 2024Observed: 7.18 ft at 11:23AM May 13, 2024Observed: 7.21 ft at 12:36PM May 13, 2024Observed: 7.17 ft at 1:05PM May 13, 2024Observed: 7.17 ft at 2:06PM May 13, 2024Observed: 7.13 ft at 3:06PM May 13, 2024Observed: 7.22 ft at 4:05PM May 13, 2024Observed: 7.19 ft at 5:12PM May 13, 2024Observed: 7.22 ft at 6:11PM May 13, 2024Observed: 7.22 ft at 7:05PM May 13, 2024Observed: 7.29 ft at 8:36PM May 13, 2024Observed: 7.29 ft at 9:24PM May 13, 2024Observed: 7.29 ft at 10:05PM May 13, 2024Observed: 7.33 ft at 11:05PM May 13, 2024Observed: 7.36 ft at 12:05AM May 14, 2024Observed: 7.41 ft at 1:05AM May 14, 2024Observed: 7.42 ft at 2:05AM May 14, 2024Observed: 7.41 ft at 3:05AM May 14, 2024Observed: 7.42 ft at 4:05AM May 14, 2024Observed: 7.41 ft at 5:05AM May 14, 2024Observed: 7.37 ft at 6:05AM May 14, 2024Observed: 7.33 ft at 7:05AM May 14, 2024Observed: 7.35 ft at 8:05AM May 14, 2024Observed: 7.35 ft at 9:05AM May 14, 2024Observed: 7.33 ft at 10:05AM May 14, 2024Observed: 7.3 ft at 11:05AM May 14, 2024Observed: 7.3 ft at 12:05PM May 14, 2024Observed: 7.25 ft at 1:05PM May 14, 2024Observed: 7.3 ft at 2:24PM May 14, 2024Observed: 7.3 ft at 3:05PM May 14, 2024Observed: 7.4 ft at 4:05PM May 14, 2024Observed: 7.42 ft at 5:32PM May 14, 2024Observed: 7.45 ft at 6:05PM May 14, 2024Observed: 7.47 ft at 7:05PM May 14, 2024Observed: 7.42 ft at 8:17PM May 14, 2024Observed: 7.43 ft at 9:30PM May 14, 2024Observed: 7.38 ft at 11:14PM May 14, 2024Observed: 7.41 ft at 12:05AM May 15, 2024Observed: 7.4 ft at 1:05AM May 15, 2024Observed: 7.4 ft at 2:05AM May 15, 2024Observed: 7.42 ft at 3:05AM May 15, 2024Observed: 7.43 ft at 4:05AM May 15, 2024Observed: 7.45 ft at 5:05AM May 15, 2024Observed: 7.38 ft at 6:05AM May 15, 2024Observed: 7.15 ft at 7:05AM May 15, 2024Observed: 7.18 ft at 8:05AM May 15, 2024Observed: 7.27 ft at 9:05AM May 15, 2024Observed: 7.3 ft at 10:05AM May 15, 2024Observed: 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, 2024Observed: 7.4 ft at 3:05AM May 16, 2024Observed: 7.39 ft at 4:05AM May 16, 2024Observed: 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, 2024FMWA2(plotting HGIRZ) Graph Created (3:17AM May 17, 2024)ObservedLatest observed value: 7.17 ft at 2:07 AM AKDT 17-May-2024. Flood Stage is 21 ft
Printable Image
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.

Return to Area Map
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
Ask Questions/Webmaster
Page last modified: 2-Nov-2020 7:26 PM 		Disclaimer
Credits
Glossary 		Privacy Policy
About Us
Career Opportunities