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Weather Forecast Office Pocatello, ID

Northwest River Forecast Center

Hydrograph

River at a Glance

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About this graph

Tabular Data (UTC)

Tabular Data (MDT)

Datum: NGVD29

Metadata

NOTE: Forecasts for the Portneuf River at Pocatello are issued routinely year-round.

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Upstream Gauge

Downstream Gauge

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) 6.98 ft on 05/02/2020 (P)
(2) 9.26 ft on 04/27/2019
(3) 8.66 ft on 04/30/2018
(4) 9.83 ft on 05/14/2017
(5) 7.33 ft on 04/15/2016
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

Zoom Level:14

	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
10	or 1146 cfs... 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 Portnuef Gap to the Cheyenne Avenue Bridge and downstream of the concrete channel beginning at Sacajawea Park.
9.4	or 1015 cfs... Water will encroach around sitting benches near the river at the Pacific Recycling Trailhead.
9.15	or 962 cfs... 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	or 830 cfs... 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	or 735 cfs... Water will encroach onto portions of the bike and walking trail next to the river in Sacajawea Park in Pocatello.
Photos (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

About This Location

Latitude: 42.871614° N, Longitude: 112.468206° W, Horizontal Datum: NAD83/WGS84

River Stage Reference Frame	Gauge Height	Flood Stage	Uses
NWS stage	0 ft	8.5 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	4418.41 ft	4426.91 ft	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 Pocatello

Additional Information

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

Resources

Hydrologic Resources

Additional Resources

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
Pocatello Weather Forecast Office
1945 Beechcraft Ave
Pocatello, ID 83204
(208) 232-9306
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Page last modified: 1-Mar-2019 12:33 AM

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