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This probabilistic forecast is issued by the Alaska Pacific River Forecast Center.
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About this graph
Forecasts for the Tonsina River at Richardson Hwy Bridge are issued routinely during the warm season, and as needed at other times of the year.
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Zoom Level:11
Flood Categories (in feet)
Major Flood Stage: 0
Moderate Flood Stage: 13
Flood Stage: 12.5
Action Stage: 11.5
Low Stage (in feet): -9999

Historic Crests
(1) 14.57 ft on 10/11/2006 (P)
(2) 13.44 ft on 06/30/2000
(3) 13.23 ft on 06/25/2001
(4) 13.00 ft on 09/22/1995
(5) 13.00 ft on 06/09/1998
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(P): Preliminary values subject to further review.

Recent Crests
(1) 10.50 ft on 06/21/2021
(2) 10.27 ft on 06/12/2017 (P)
(3) 10.59 ft on 06/21/2016 (P)
(4) 12.15 ft on 06/25/2012 (P)
(5) 10.88 ft on 06/05/2011
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
Currently none available.
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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
25.5 Bridge Low Cord
12 High water level -- Class IV whitewater in Tonsina River canyon
11.5 Bankfull -- stage associated with a flow (5100 cfs) having a recurrence interval of ~2 years
10 Medium water level -- Class III+ whitewater in Tonsina River canyon
9 Low water level -- Class III whitewater in Tonsina River canyon
(1) Looking Downstream
(2) Looking Upstream
(3) Flood 10/10/2006
(4) Flood 10/10/2006
(5) Flood 10/10/2006
(6) Bridge
(7) Downstream left bank stage 9.96ft
(8) Downstream right bank stage 9.96ft
Additional Information Collapse
Long-term Hydrograph
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
Anchorage Weather Forecast Office
6930 Sand Lake Road
Anchorage, AK 99502
(907) 266-5160
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Page last modified: 2-Nov-2020 7:26 PM
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