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Advanced Hydrologic Prediction Service
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This probabilistic forecast is issued by the Northwest River Forecast Center.
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About this graph
Forecasts are not available for the Portneuf River at Topaz. Only observed stages are available for this point.
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Downstream Gauge Downstream Gauge - at Pocatello
Zoom Level:16
Flood Categories (in feet)
Major Flood Stage: 0
Moderate Flood Stage: 0
Flood Stage: 4
Action Stage: 3.5
Low Stage (in feet): -9999

Historic Crests
(1) 6.00 ft on 12/23/1964
(2) 5.71 ft on 02/25/1957
(3) 5.59 ft on 02/20/1980
(4) 5.56 ft on 01/22/1969
(5) 5.42 ft on 05/21/1984
Show More Historic Crests

(P): Preliminary values subject to further review.

Recent Crests
(1) 3.11 ft on 05/08/2022
(2) 3.28 ft on 06/07/2021
(3) 3.44 ft on 05/03/2020
(4) 3.72 ft on 06/02/2019
(5) 4.92 ft on 03/23/2018
Show More Recent Crests

(P): Preliminary values subject to further review.

Low Water Records
(1) 2.10 ft on 09/25/1994
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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
4.02 Lowland and crop field flooding possible from Pebble Creek to Inkom.
3.5 Near bankfull from Pebble Creek Road downstream to Inkom. Isolated ponding in flat areas near Symons Road.

Other Real-time and/or Archive Data Sources:

Additional Information Collapse
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 1610 CFS or 5.53 ft
50   Year Peak Flood 2100 CFS
100 Year Peak Flood 2730 CFS
200 Year Peak Flood 3510 CFS
500 Year Peak Flood 4860 CFS

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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