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This probabilistic forecast is issued by the Northwest River Forecast Center.
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About this graph
Forecasts for the Portneuf River at Pocatello are issued routinely year-round.
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Upstream Locations Upstream Gauge
Zoom Level:14
Flood Categories (in feet)
Major Flood Stage: 11
Moderate Flood Stage: 10
Flood Stage: 8.5
Action Stage: 8
Low Stage (in feet): -9999

Historic Crests
(1) 13.85 ft on 05/17/1984
(2) 11.19 ft on 05/31/1983
(3) 10.52 ft on 05/03/2006
(4) 9.95 ft on 05/27/2011
(5) 9.83 ft on 05/14/2017
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 5.43 ft on 05/08/2022
(2) 5.31 ft on 03/20/2021
(3) 6.97 ft on 05/02/2020
(4) 9.26 ft on 04/27/2019
(5) 8.66 ft on 04/30/2018
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
10 Significant flooding of agricultural land will occur from the Inkom and Blackrock area. Lowland flooding will occur along sections of the river in Pocatello from Portneuf Gap to the Cheyenne Avenue Bridge and downstream of the concrete channel beginning at Sacajawea Park.
9.4 Water will encroach around sitting benches near the river at the Pacific Recycling Trailhead.
9.15 Flooding of low lying agricultural land and pasture will occur in the Inkom and Blackrock area. Lowland flooding is likely along sections of the river between Portneuf Gap and the Cheyenne Avenue Bridge in Pocatello.
8.5 Sections of Sacajawea Park will be under water and the trail is usually closed at this level. Marsh Creek near Inkom may also be over its banks.
8 Water will encroach onto portions of the bike and walking trail next to the river in Sacajawea Park in Pocatello.
(1) PIHI1_googleearth
(2) PIHI1_map
(3) PIHI1_gagehouse_surveycable
(4) PIHI1_looking_upstream
(5) PIHI1_looking_downstream
(6) PIHI1_lookingstraightfromgage
(7) PIHI1_portneuf_river_canal
(8) PIHI1_portneuf_areal_canal
(9) PIHI1

Other Real-time and/or Archive Data Sources:

Additional Information Collapse
Portneuf USGS Webcam   
Historical Peak Flows     (Scroll to Streamflow Statistics for more years)
USGS Historical Peak Flows Explanation
Graphical View of Historical Peak Flows and Gage Analysis 

25   Year Peak Flood 2010 CFS or 11.97 ft
50   Year Peak Flood 2440 CFS or 12.69 ft
100 Year Peak Flood 2930 CFS or 13.27 ft
200 Year Peak Flood 3490 CFS or 13.82 ft
500 Year Peak Flood 4360 CFS or 14.54 ft
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
Pocatello Weather Forecast Office
1945 Beechcraft Ave
Pocatello, ID 83204
(208) 232-9306
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Page last modified: 2-Nov-2020 7:28 PM
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