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Hydrograph River at a Glance Download
Eyak River at Copper River Highway Stage (ft)Observed: 16.75 ft at 2:58AM Mar 19, 2023Highest Observation: 16.77 ft at 8:56AM Mar 19, 2023Observed: 16.71 ft at 2:55PM Mar 19, 2023Observed: 16.74 ft at 8:54PM Mar 19, 2023Observed: 16.72 ft at 2:53AM Mar 20, 2023Observed: 16.68 ft at 8:50AM Mar 20, 2023Observed: 16.63 ft at 2:50PM Mar 20, 2023Observed: 16.64 ft at 8:48PM Mar 20, 2023Observed: 16.64 ft at 2:47AM Mar 21, 2023Observed: 16.58 ft at 9:09AM Mar 21, 2023Observed: 16.55 ft at 2:44PM Mar 21, 2023Observed: 16.57 ft at 9:05PM Mar 21, 2023Observed: 16.61 ft at 4:15AM Mar 22, 2023Observed: 16.6 ft at 9:38AM Mar 22, 2023Observed: 16.54 ft at 3:01PM Mar 22, 2023Observed: 16.63 ft at 8:59PM Mar 22, 2023Observed: 16.63 ft at 3:35AM Mar 23, 2023Observed: 16.61 ft at 9:32AM Mar 23, 2023Observed: 16.51 ft at 2:33PM Mar 23, 2023Observed: 16.56 ft at 8:32PM Mar 23, 2023Observed: 16.56 ft at 3:29AM Mar 24, 2023Observed: 16.54 ft at 8:51AM Mar 24, 2023Observed: 16.48 ft at 2:27PM Mar 24, 2023Observed: 16.49 ft at 8:26PM Mar 24, 2023Observed: 16.49 ft at 3:23AM Mar 25, 2023Observed: 16.48 ft at 8:45AM Mar 25, 2023Observed: 16.43 ft at 2:22PM Mar 25, 2023Observed: 16.41 ft at 8:20PM Mar 25, 2023EYAA2(plotting HGIRZ) Graph Created (10:31PM Mar 25, 2023)ObservedLatest observed value: 16.41 ft at 8:20 PM AKDT 25-Mar-2023. Flood Stage is 24.5 ft
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About this graph
Tabular Data (UTC)
Tabular Data (AKDT)
XML Data
RSS Files
Datum: Not Available
Metadata
NOTE: Gage data do not meet the quality standards of USGS gages.

NOTE: Stage may be affected by ice.

NOTE: Forecasts are not available for the Eyak River at Copper River Highway. Only observed stages are available for this point.

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Upstream Gauge - near Cordova Upstream Gauge Downstream Gauge Downstream Gauge - near Cordova
Flood Categories (in feet)
Major Flood Stage: 0
Moderate Flood Stage: 25.5
Flood Stage: 24.5
Action Stage: 23.5
Low Stage (in feet): -9999

Historic Crests
(1) 28.07 ft on 10/10/2006
(2) 25.95 ft on 08/20/2006
(3) 25.05 ft on 09/17/2012
(4) 24.27 ft on 08/30/2017 (P)
(5) 24.08 ft on 09/14/2014 (P)
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 21.90 ft on 08/28/2021
(2) 24.27 ft on 08/30/2017 (P)
(3) 23.91 ft on 08/08/2016 (P)
(4) 23.92 ft on 09/29/2015 (P)
(5) 24.08 ft on 09/14/2014 (P)
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.
Zoom Level:11
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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
25.7 Approximate gage height of 2015 FEMA 1% annual exceedance probability (100 yr) flood
25.5 Moderate Flood Stage. Water surrounding homes along Eyak River, necessitating taking boats to homes. Septic fields flooded. All of Cordova's Municipal Airport runway underwater. With any wind/wave action, Power Creek Road is flooded and eroded.
24.5 Flood stage. Water in residences's yards, garages, crawl spaces and basements. Most of weir near the Eyak Lake outlet underwater. Standing water on parts of Cordova's Municipal Airport runway. Washouts can be a serious problem near the Sheridan River where the bridge span is to short to carry the flow on a braded system.
23.5 Action stage. Closer monitoring of water levels draining the Gulf of Alaska.
22.5 Bankfull.
Photos
(1) Eyak Bridge near minor flood stage 24.5
(2) Eyak Bridge downstream view near flood stage 24.5
(3) Upstream stage 24.52ft
About This Location Collapse

Latitude: 60.531111° N, Longitude: 145.644444° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame		 Gauge Height Flood Stage Uses
NWS stage 0 ft 24.5 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  
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Long-term Hydrograph
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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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