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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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Printable Image About this graph Tabular Data (UTC) Tabular Data (AKDT) Datum: Not Available Metadata

NOTE: Stage may be affected by ice. 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.

Default Hydrograph Scale to Flood Categories   Return to Area Map

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) 17,800 cfs on 06/13/2020 (2) 25,600 cfs on 07/09/2019 (3) 22,600 cfs on 08/06/2018 (4) 0 cfs on 06/11/2018 (5) 23,500 cfs on 07/09/2017 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 www.floodsmart.gov. Show FEMA's National Flood Hazard Layers FEMA's National Flood Hazard Layers not showing? Why aren't the FEMA National Flood Hazard Layers showing on the ESRI Map? Possible reasons: There are no FEMA National Flood Hazard Layers for the location which you are viewing on ESRI Maps. The FEMA Web Mapping Service (WMS) is down. Note: Your zoom level may have changed. ESRI's zoom levels must be between 14 and 16 to show National Flood Hazard layers.

Zoom Level:10 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

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
Photos (1) Downstream (2) Upstream (3) Matanuska from overlook

About This Location

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) 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 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: U.S. Geological Survey (USGS) Data and Site Info for Old Glenn Hwy

Additional Information

Click here to view the Matanuska River Flooding and Erosion Background Information page Water Temperature Chart

Resources

Hydrologic Resources Text Products Past Precipitation Forecast Precipitation River Forecast Centers River Stage Summary Alaska-Pacific River Forecast Center Inundation Mapping Locations

Additional Resources Area Hydrographs NWS Precipitation and River Forecasting AHPS Iframes for Developers Mobile iNWS for emergency management Search River Notes Nat'l Snow Information Alaska Snow Maps Flood Stage Definitions

Collaborative Agencies 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) 266-5105 Ask Questions/Webmaster Page last modified: 2-Nov-2020 7:26 PM Disclaimer Credits Glossary Privacy Policy About Us Career Opportunities