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Hydrograph River at a Glance Download
Matanuska River at Old Glenn Hwy Stage (ft)USGS--Water Resources of the United StatesMATA2(plotting HGIRZ) Graph Created (12:16PM Mar 31, 2020)Flood Flow is 30 kcfs
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Datum: Not Available
NOTE: Gauge reading may be affected by ice.

NOTE: Click here to view the Matanuska River Flooding and Erosion Background Information page.

NOTE: Forecasts for the Matanuska River at Old Glenn Hwy are issued routinely during the warm season, and as needed at other times of the year.

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Upstream Gauge - at Glacier Park Resort Upstream Gauge
Flood Categories (in KCFS)
Major Flood Flow: 0
Moderate Flood Flow: 35
Flood Flow: 30
Action Flow: 15
Low Stage (in feet): -9999

Historic Crests
(1) 82,100 cfs on 08/10/1971
(2) 46,000 cfs on 09/22/1995
(3) 45,000 cfs on 06/21/2004
(4) 40,100 cfs on 06/08/1964
(5) 38,100 cfs on 09/21/2012
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 23,500 cfs on 07/09/2017
(2) 27,600 cfs on 07/03/2016
(3) 15,100 cfs on 07/08/2015
(4) 20,400 cfs on 07/09/2014
(5) 27,400 cfs on 06/18/2013
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
Currently none available.

For more information on your flood risk go to

Zoom Level:10
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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.
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If you notice any errors in the below information, please contact our Webmaster
35000 This discharge (flow) level has a roughly 10 percent chance of being reached in any given year. Flooding near vulnerable locations along the active river channel may become more significant and widespread. This level was reached during the flooding in 2012.
30000 This discharge (flow) level has a roughly 20 percent chance of being reached in any given year. Additional vulnerable locations near the active river channel may experience some flooding at this level west of the Old Glenn Highway in the Butte and near Sutton from Milepost 64 to 66. Residents are advised that for the past several years at both of these locations, the main channel of the river has been shifting closer to the bank.
15000 This discharge (flow) level represents the higher end of the typical summertime range, and will likely be reached at least once nearly every year. Localized minor out-of-bank flooding may start to occur along parts of the Glenn highway, especially east of Sutton from milepost 64 to 66.
10.5 This stage (water level) is considered medium water level -- Class III whitewater to King's River; Class II below King's River
8 This stage (water level) is considered low water level -- Class II+ whitewater to King's River; Class I below King's River
(1) Downstream
(2) Upstream
(3) Matanuska from overlook
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Latitude: 61.608611° N, Longitude: 149.073056° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame
Gauge Height Flood Stage Uses
NWS flow Not Available Not Available 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 NULL NULL Older USGS topographic maps, NGVD29 benchmarks
MSL Not Available Not Available Older USGS topographic maps, MSL benchmarks
Other Not Available Not Available  

Current/Historical Observations:

Additional Information Collapse
More info from the USGS regarding the effects of ice on streamflow: During cold weather, ice effects on stage and discharge determinations at some streamgages are likely. Streamgages experiencing ice conditions will have the discharge record temporarily disabled to prevent the display of erroneous discharge values. The discharge record will resume when it is determined that ice conditions are no longer present. Ice-effected discharge is computed after detailed analysis and cannot be displayed in realtime. Click here to view the Matanuska River Flooding and Erosion Background Information page
Long-term Hydrograph
Water Temperature Chart
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Hydrologic Resources Additional Resources
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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
Anchorage Weather Forecast Office
6930 Sand Lake Road
Anchorage, AK 99502
(907) 266-5160
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Page last modified: 1-Mar-2019 12:31 AM
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