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Hydrograph River at a Glance Download
Twentymile River near Portage Stage (ft)Observed: 10.43 ft at 4:55AM Feb 21, 2021Observed: 10.4 ft at 5:55AM Feb 21, 2021Observed: 10.39 ft at 6:55AM Feb 21, 2021Observed: 10.34 ft at 7:55AM Feb 21, 2021Observed: 10.15 ft at 8:55AM Feb 21, 2021Observed: 10.32 ft at 9:55AM Feb 21, 2021Observed: 10.28 ft at 10:55AM Feb 21, 2021Observed: 10.27 ft at 11:55AM Feb 21, 2021Observed: 10.29 ft at 12:55PM Feb 21, 2021Observed: 10.29 ft at 1:55PM Feb 21, 2021Observed: 10.3 ft at 2:55PM Feb 21, 2021Observed: 10.37 ft at 3:55PM Feb 21, 2021Observed: 10.45 ft at 4:55PM Feb 21, 2021Observed: 10.55 ft at 5:55PM Feb 21, 2021Observed: 10.4 ft at 6:55PM Feb 21, 2021Observed: 10.22 ft at 7:55PM Feb 21, 2021Observed: 10.4 ft at 8:55PM Feb 21, 2021Observed: 10.4 ft at 9:55PM Feb 21, 2021Observed: 10.4 ft at 10:55PM Feb 21, 2021Observed: 10.38 ft at 11:55PM Feb 21, 2021Observed: 10.35 ft at 12:55AM Feb 22, 2021Observed: 10.21 ft at 1:55AM Feb 22, 2021Observed: 10.21 ft at 2:55AM Feb 22, 2021Observed: 10.33 ft at 3:55AM Feb 22, 2021Observed: 10.31 ft at 4:55AM Feb 22, 2021Observed: 10.31 ft at 5:55AM Feb 22, 2021Observed: 10.23 ft at 6:55AM Feb 22, 2021Observed: 10.32 ft at 7:55AM Feb 22, 2021Observed: 10.31 ft at 8:55AM Feb 22, 2021Observed: 10.33 ft at 9:55AM Feb 22, 2021Observed: 10.31 ft at 10:55AM Feb 22, 2021Observed: 10.3 ft at 11:55AM Feb 22, 2021Observed: 10.34 ft at 12:55PM Feb 22, 2021Observed: 10.31 ft at 1:55PM Feb 22, 2021Observed: 10.32 ft at 2:55PM Feb 22, 2021Observed: 10.3 ft at 3:55PM Feb 22, 2021Observed: 10.3 ft at 4:55PM Feb 22, 2021Observed: 10.31 ft at 5:55PM Feb 22, 2021Observed: 10.3 ft at 6:55PM Feb 22, 2021Observed: 10.29 ft at 7:55PM Feb 22, 2021Observed: 10.36 ft at 8:55PM Feb 22, 2021Observed: 10.3 ft at 9:55PM Feb 22, 2021Observed: 10.31 ft at 10:55PM Feb 22, 2021Observed: 10.35 ft at 11:55PM Feb 22, 2021Observed: 10.35 ft at 12:55AM Feb 23, 2021Observed: 10.35 ft at 1:55AM Feb 23, 2021Observed: 10.36 ft at 2:55AM Feb 23, 2021Observed: 10.35 ft at 3:55AM Feb 23, 2021Observed: 10.36 ft at 4:55AM Feb 23, 2021Observed: 10.41 ft at 5:55AM Feb 23, 2021Observed: 10.37 ft at 6:55AM Feb 23, 2021Observed: 10.34 ft at 7:55AM Feb 23, 2021Observed: 10.35 ft at 8:55AM Feb 23, 2021Observed: 10.33 ft at 9:55AM Feb 23, 2021Observed: 10.3 ft at 10:55AM Feb 23, 2021Observed: 10.35 ft at 11:55AM Feb 23, 2021Observed: 10.3 ft at 12:55PM Feb 23, 2021Observed: 10.33 ft at 1:55PM Feb 23, 2021Observed: 10.32 ft at 2:55PM Feb 23, 2021Observed: 10.31 ft at 3:55PM Feb 23, 2021Observed: 10.31 ft at 4:55PM Feb 23, 2021Observed: 10.33 ft at 5:55PM Feb 23, 2021Observed: 10.34 ft at 6:55PM Feb 23, 2021Observed: 10.31 ft at 7:55PM Feb 23, 2021Observed: 10.28 ft at 8:55PM Feb 23, 2021Observed: 10.29 ft at 9:55PM Feb 23, 2021Observed: 10.3 ft at 10:55PM Feb 23, 2021Observed: 10.33 ft at 11:55PM Feb 23, 2021Observed: 10.3 ft at 12:55AM Feb 24, 2021Observed: 10.33 ft at 1:55AM Feb 24, 2021Observed: 10.32 ft at 2:55AM Feb 24, 2021Observed: 10.34 ft at 3:55AM Feb 24, 2021Observed: 10.33 ft at 4:55AM Feb 24, 2021Observed: 10.27 ft at 5:55AM Feb 24, 2021Observed: 10.36 ft at 6:55AM Feb 24, 2021Observed: 10.36 ft at 7:55AM Feb 24, 2021Observed: 10.36 ft at 8:55AM Feb 24, 2021Observed: 10.36 ft at 9:55AM Feb 24, 2021Observed: 10.27 ft at 10:55AM Feb 24, 2021Observed: 10.31 ft at 11:55AM Feb 24, 2021Observed: 10.29 ft at 12:55PM Feb 24, 2021Observed: 10.27 ft at 1:55PM Feb 24, 2021Observed: 10.27 ft at 2:55PM Feb 24, 2021Observed: 10.21 ft at 3:55PM Feb 24, 2021Observed: 10.27 ft at 4:55PM Feb 24, 2021Observed: 10.41 ft at 5:55PM Feb 24, 2021Observed: 11.34 ft at 7:55PM Feb 24, 2021Observed: 11.03 ft at 8:55PM Feb 24, 2021Observed: 10.81 ft at 9:55PM Feb 24, 2021Observed: 10.72 ft at 10:55PM Feb 24, 2021Observed: 10.69 ft at 11:55PM Feb 24, 2021Observed: 10.64 ft at 12:55AM Feb 25, 2021Observed: 10.57 ft at 2:55AM Feb 25, 2021Observed: 10.54 ft at 3:55AM Feb 25, 2021Observed: 10.54 ft at 4:55AM Feb 25, 2021Observed: 10.52 ft at 5:55AM Feb 25, 2021Observed: 10.64 ft at 6:55AM Feb 25, 2021Observed: 11.58 ft at 8:55AM Feb 25, 2021Observed: 11.3 ft at 9:55AM Feb 25, 2021Observed: 10.9 ft at 10:55AM Feb 25, 2021Observed: 10.77 ft at 11:55AM Feb 25, 2021Observed: 10.67 ft at 12:55PM Feb 25, 2021Observed: 10.65 ft at 1:55PM Feb 25, 2021Observed: 10.55 ft at 2:55PM Feb 25, 2021Observed: 10.51 ft at 3:55PM Feb 25, 2021Observed: 10.45 ft at 4:55PM Feb 25, 2021Observed: 10.52 ft at 5:55PM Feb 25, 2021Observed: 12.15 ft at 6:55PM Feb 25, 2021Observed: 11.96 ft at 8:55PM Feb 25, 2021Observed: 11.55 ft at 9:55PM Feb 25, 2021Observed: 11.23 ft at 10:55PM Feb 25, 2021Observed: 10.94 ft at 11:55PM Feb 25, 2021Observed: 10.83 ft at 12:55AM Feb 26, 2021Observed: 10.7 ft at 1:55AM Feb 26, 2021Observed: 10.69 ft at 2:55AM Feb 26, 2021Observed: 10.54 ft at 3:55AM Feb 26, 2021Observed: 10.5 ft at 4:55AM Feb 26, 2021Observed: 10.45 ft at 5:55AM Feb 26, 2021Observed: 10.68 ft at 6:55AM Feb 26, 2021Observed: 12.6 ft at 8:55AM Feb 26, 2021Observed: 12.04 ft at 9:55AM Feb 26, 2021Observed: 11.62 ft at 10:55AM Feb 26, 2021Observed: 11.27 ft at 11:55AM Feb 26, 2021Observed: 10.96 ft at 12:55PM Feb 26, 2021Observed: 10.76 ft at 1:55PM Feb 26, 2021Observed: 10.59 ft at 2:55PM Feb 26, 2021Observed: 10.5 ft at 3:55PM Feb 26, 2021Observed: 10.42 ft at 4:55PM Feb 26, 2021Observed: 10.4 ft at 5:55PM Feb 26, 2021Observed: 12.14 ft at 10:55PM Feb 26, 2021Observed: 11.7 ft at 11:55PM Feb 26, 2021Observed: 11.31 ft at 12:55AM Feb 27, 2021Observed: 10.97 ft at 1:55AM Feb 27, 2021Observed: 10.75 ft at 2:55AM Feb 27, 2021Observed: 10.59 ft at 3:55AM Feb 27, 2021Observed: 10.48 ft at 4:55AM Feb 27, 2021Observed: 10.44 ft at 5:55AM Feb 27, 2021Observed: 10.38 ft at 6:55AM Feb 27, 2021Observed: 14.13 ft at 7:55AM Feb 27, 2021Observed: 12.52 ft at 11:55AM Feb 27, 2021Observed: 11.07 ft at 2:55PM Feb 27, 2021Observed: 10.86 ft at 3:55PM Feb 27, 2021Observed: 10.51 ft at 4:55PM Feb 27, 2021Observed: 10.36 ft at 5:55PM Feb 27, 2021Highest Observation: 14.2 ft at 10:55PM Feb 27, 2021TMRA2(plotting HGIRR) Graph Created (4:46AM Feb 28, 2021)ObservedLatest observed value: 14.2 ft at 10:55 PM AKST 27-Feb-2021.
About this graph
Tabular Data (UTC)
Tabular Data (AKST)
XML Data
RSS Files
Datum: Not Available
Metadata
NOTE: Forecasts for the Twentymile River near Portage are issued routinely during the warm season, and as needed at other times of the year.
Return to Area Map
Flood Categories (in feet)
Major Flood Stage: 0
Moderate Flood Stage: 28
Flood Stage: 26
Action Stage: 24
Low Stage (in feet): 0

Historic Crests
(1) 25.88 ft on 10/03/2003
(2) 25.47 ft on 08/29/2001
(3) 25.02 ft on 09/07/2011
(4) 24.99 ft on 07/22/2009
(5) 24.87 ft on 10/24/2002
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 25.02 ft on 09/07/2011
(2) 22.74 ft on 07/10/2010
(3) 24.99 ft on 07/22/2009
(4) 23.40 ft on 09/03/2008
(5) 23.83 ft on 10/10/2006
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
KML Image
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.
About This Location Collapse

Latitude: 60.898056° N, Longitude: 148.921944° W, Horizontal Datum: NAD83/WGS84

River Stage
Reference Frame		 Gauge Height Flood Stage Uses
NWS stage 0 ft 26 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 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
30 Day Graphs
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Hydrologic Resources Additional Resources
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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