Portneuf River at Topaz water level

Name: Portneuf River at Topaz water level (U.S. Geological Survey)
Creator: U.S. Geological Survey
License: https://www.usgs.gov/information-policies-and-instructions/copyrights-and-credits

River gauge, Portneuf River, Idaho, United States

Directions

Below flood stage

Water level

2.46ft Steady over the last 24 hours

Measured Oct 19, 2026, 07:15 AM MDT (1 hour ago)

Flow: 70.9 cfs

History

7 days

Water level Forecast Minor flood stage

The forecast expects the river to rise to 3.36 ft by Saturday, October 24 at 12:00 PM. Issued Sunday, October 18 at 10:51 AM by NOAA National Weather Service.

What this means

Water levels are unremarkable at Portneuf River at Topaz, where the gauge shows 2.46 ft.

It is 1.56 ft below the flood stage of 4.02 ft.

The level has held steady over the past 24 hours. The forecast expects the river to rise to 3.36 ft by Saturday, October 24 at 12:00 PM. The 30-day range is 2.33 ft – 2.64 ft.

Judged against the official flood stage for this gauge. How to read levels

Key numbers

Highest on record: 6.00 ftDecember 23, 1964
Forecast peak: 3.36 ftSaturday, October 24 at 12:00 PM

Paddling and fishing conditions

Most paddlers and anglers will find the river in good shape at this stage.

For reference, flood stage is 4.02 ft.

What happens at each level

4.02 ft: Lowland and crop field flooding possible from Pebble Creek to Inkom.
3.50 ft: Near bankfull from Pebble Creek Road downstream to Inkom. Isolated ponding in flat areas near Symons Road.
2.46 ft: Right now

Impact statements from the U.S. National Weather Service.

Highest crests on record

Rank	Level	Date
1	6.00 ft	December 23, 1964
2	5.71 ft	February 25, 1957
3	5.59 ft	February 20, 1980
4	5.56 ft	January 22, 1969
5	5.42 ft	May 21, 1984
6	5.39 ft	May 18, 1996
7	5.32 ft	May 14, 1971
8	5.27 ft	April 10, 1976
9	5.24 ft	May 18, 1997
10	5.20 ft	May 31, 1983

Weather at the gauge

No rain in the last 3 days.

18 Sun 67° 48° – Wind 11 mph

19 Mon 67° 51° – Wind 11 mph

20 Tue 64° 49° 0.05 in, 32% Wind 14 mph

21 Wed 70° 47° 0.00 in Wind 9 mph

22 Thu 69° 50° 0.17 in, 60% Wind 10 mph

23 Fri 49° 43° 1.00 in, 82% Wind 11 mph

24 Sat 54° 39° – Wind 5 mph

Forecast: Open-Meteo

Sunrise 07:47 AM Sunset 06:41 PM Daylight 10 hr, 54 min First quarter 59%

Map

Other gauges on the Portneuf River

Gauge	Level	Compared with normal	24 hours	Distance
Portneuf River at PebbleRiver gauge, Portneuf River	5.01 ft	No reference yet	+0.01 ft	9 mi
Portneuf River at PocatelloRiver gauge, Portneuf River	3.70 ft	Below flood stage	−0.01 ft	26 mi
Portneuf River near TyheeRiver gauge, Portneuf River	4.55 ft	Below flood stage	−0.03 ft	32 mi

Nearby gauges

Gauge	Level	Compared with normal	24 hours	Distance
Marsh Creek near McCammonRiver gauge, Marsh Creek	2.54 ft	Below flood stage	−0.01 ft	7 mi
Blackfoot River above Reservoir near HenryRiver gauge, Blackfoot River	1.63 ft	Below flood stage	−0.04 ft	32 mi
Spring Creek at Sheepskin Road near Fort HallRiver gauge, Spring Creek	226 cfs	Very low	+6.0 cfs	37 mi
Blackfoot River below North Canal at BlackfootRiver gauge, Blackfoot River	170 cfs	Low	−7.0 cfs	40 mi
Grays Lake Diversion to Blackfoot R Basin near WayanRiver gauge, Grays Lake Diversion to Blackfoot R Basin	0.0 cfs	Low	±0	40 mi
Blackfoot River near BlackfootRiver gauge, Blackfoot River	3.07 ft	Below flood stage	−0.04 ft	40 mi
Blackfoot River and Bypass Channel near BlackfootRiver gauge, Blackfoot River and Bypass Channel	160 cfs	Low	−6.0 cfs	40 mi
Bear River at PescaderoRiver gauge, Bear River	1.74 ft	Below flood stage	±0	40 mi

Questions and answers

What is flood stage for the Portneuf River at Topaz?

The official flood stage is 4.02 ft. The level is currently 1.56 ft below it.

Is gage height the same as water depth?

No. Gage height is measured from a fixed reference point chosen by the agency, so a reading of 10 ft does not mean the river is 10 ft deep.

What is the water level of Portneuf River at Topaz today?

On Oct 19, 2026, 07:15 AM MDT, the water level was 2.46 ft. Steady over the last 24 hours.

Is Portneuf River at Topaz rising or falling?

Steady over the last 24 hours.

Is the level of Portneuf River at Topaz normal?

Below flood stage. Judged against the official flood stage for this gauge.

What is the highest water level ever recorded at Portneuf River at Topaz?

The highest level on record is 6.00 ft on December 23, 1964.

Is Portneuf River at Topaz expected to rise?

The forecast expects the river to rise to 3.36 ft by Saturday, October 24 at 12:00 PM.

For specialists

Station codes, datum, parameters, data quality and downloads

Operator: U.S. Geological Survey
Station code: usgs:13073000 (Agency page)
Coordinates: 42.62472, -112.08806 (WGS84)
Vertical datum: NAVD88
Update interval: every 15 minutes
Licence: Public domain. Data: U.S. Geological Survey (USGS), provisional data subject to revision

Published series

Parameter	Last value	Time (UTC)	Quality
Water level	2.46 ft	2026-10-19 13:15	Provisional
Flow	70.9 cfs	2026-10-19 13:15	Provisional

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How to cite

U.S. Geological Survey: Portneuf River at Topaz (usgs:13073000). Accessed October 19, 2026 via Nivelmap, https://nivelmap.com/en/united-states/idaho/portneuf-river-at-topaz

How we check values

Each reading is stored as published. We hold back values that jump faster than physically plausible and show the measurement time with every value.

Readings are provisional, can be delayed or wrong and are not a flood warning. Read the disclaimer