Portneuf River at Topaz, ID
River level and flood forecast · Bannock County
The river is 1.5 ft below flood stage (4.02 ft).
Forecast to hold near 2.6 ft through Mon, Oct 19, 6 PM.
Flow: 86 cubic feet per second (USGS).
The last 7 days and the forecast
NWS forecast issued Mon, Oct 12, 1:06 PM. Forecasts change as rain falls and as upstream water arrives.
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An email when the National Weather Service forecasts Portneuf River at Topaz to flood, when it floods, and when it's over.
Flood stages
| Flood stage | 4.02 ft |
| Action stage | 3.5 ft |
| Record crest (December 23, 1964) | 6 ft |
What floods at each level
From the National Weather Service, highest first.
- 4.02 ftLowland and crop field flooding possible from Pebble Creek to Inkom.
- 3.5 ftNear bankfull from Pebble Creek Road downstream to Inkom. Isolated ponding in flat areas near Symons Road.
Highest crests on record
- 6 ft — December 23, 1964
- 5.71 ft — February 25, 1957
- 5.59 ft — February 20, 1980
- 5.56 ft — January 22, 1969
- 5.42 ft — May 21, 1984
Recent crests: 3.11 ft (May 8, 2022) · 3.28 ft (June 7, 2021) · 3.44 ft (May 3, 2020) · 3.72 ft (June 2, 2019) · 4.92 ft (March 23, 2018)
Up and down the river, and nearby
- DownstreamPortneuf River at Inkom, ID, ID
- Marsh Creek (Eastern ID) near McCammon, ID
- Portneuf River above Toponce Rd, nr Chesterfield ID, ID
- Portneuf River at Pocatello, ID
- Portneuf River at Tyhee, ID
- Spring Creek (Eastern ID) near Fort Hall, ID
- Grays Lake Diversion to Blackfoot River near Wayan, ID
- Blackfoot River near Blackfoot (Butte Road-Ft. Hall), ID
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (TOPI1); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.