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Weather Forecast Office Anchorage, AK

Alaska Pacific River Forecast Center

Hydrograph

River at a Glance

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Probability Information Weekly Chance of Exceeding Levels Chance of Exceeding Levels During Entire Period Short-term Probabilistic Guidance (Experimental) Not Available

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About this graph Tabular Data (UTC) Tabular Data (AKST) Datum: Not Available Metadata

NOTE: Stage may be affected by ice. NOTE: Flood stage levels are based on recurrence intervals and may not be representative of local impacts. NOTE: Forecasts for the Gulkana River at Sourdough are issued routinely during the warm season, and as needed at other times of the year.

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Upstream Gauge

Downstream Gauge

Flood Categories (in feet) Major Flood Stage: 0 Moderate Flood Stage: 0 Flood Stage: 11 Action Stage: 9.5 Low Stage (in feet): -9999 Historic Crests (1) 16.03 ft on 05/07/1976 (2) 14.64 ft on 05/05/2009 (3) 14.62 ft on 05/30/2013 (4) 12.00 ft on 10/10/2006 (5) 11.26 ft on 09/12/1990 Show More Historic Crests (P): Preliminary values subject to further review. Recent Crests (1) 10.09 ft on 06/24/2020 (2) 8.57 ft on 05/09/2019 (3) 10.75 ft on 06/13/2018 (4) 8.85 ft on 05/02/2017 (5) 8.52 ft on 07/26/2016 Show More Recent Crests (P): Preliminary values subject to further review. Low Water Records Currently none available.

Zoom Level:8 Legend FEMA Layer Gauge Location 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

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12.5	Stage associated with flow (16900 cfs) having a recurrence interval of >50 years; major flooding would be expected on this and nearby streams
12	Stage associated with flow (15200 cfs) having a recurrence interval of 20-40 years; moderate flooding would be expected on this and nearby streams
11	Stage associated with a flow (11900 cfs) having a recurrence interval of ~10 years; minor flooding would be expected on this and nearby streams
9.5	Bankfull -- stage associated with flow (7400 cfs) having a recurrence interval of ~2 years
Photos (1) Upstream at Sourdough Campground stage 10.07ft (2) Downstream stage 10.07ft

About This Location

Latitude: 62.520833° N, Longitude: 145.530833° W, Horizontal Datum: NAD83/WGS84 River Stage Reference Frame Gauge Height Flood Stage Uses NWS stage 0 ft 11 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 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 NULL NULL   Current/Historical Observations: U.S. Geological Survey (USGS) Data and Site Info for Sourdough

Additional Information

Water Temperature Chart

Resources

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