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Kootenai River at Porthill water level

River gauge, Kootenai River, Idaho, United States

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Right now

Low for mid-October

Water level

43.95ft Steady over the last 24 hours

Flow
4,490 cfs
Water temperature
50 °F
38 50 63 75 Highest onrecord 72.70 ft Lowest on record 38.21 ft

History

History
4446ftOct 13Oct 14Oct 16Oct 17Oct 194446ftOct 13Oct 16Oct 19
4446ftSep 20Sep 27Oct 4Oct 12Oct 194446ftSep 20Oct 4Oct 19
405060ftOct 2025Jan 2026Apr 2026Jul 2026Oct 2026405060ftOct 2025Apr 2026Oct 2026
405060ftJanMarMayJulSepNov2026405060ftJanAprJulOct2026

20252026

Water level Normal range (10–90 %)

What this means

At 43.95 ft, the Kootenai River at Porthill is below normal for mid-October.

The median for mid-October is 45.72 ft, based on 66 years of readings, so the river stage is 1.76 ft below typical. On the same day last year the reading was 43.88 ft, a difference of +0.07 ft.

It has barely moved over the past 24 hours. Without real rain upstream, that is unlikely to change quickly. Over the past 30 days it has moved between 43.92 ft and 44.31 ft.

Fall is often low-water season on rivers, and it usually takes a few days of steady rain to change that. The water temperature at the gauge is 50 °F.

Compared with 66 years of daily readings for this time of year. How to read levels

Key numbers

Median for this date
45.72 ft1.76 ft below the median for this date
Normal for this date
43.10 ft – 47.05 ft8 years in 10 fall in this range (66 years of records)
Same day last year
43.88 ft+0.07 ft
Lowest and highest in 30 days
43.92 ft – 44.31 ft
Lowest and highest in 12 months
41.70 ft – 51.21 ft
Highest on record
72.70 ftJune 1, 1894
Lowest on record
38.21 ftApril 3, 1944

What the stage means on the water

Low water means more dragging on shallow riffles and slower floats. Fish crowd into the deeper runs, and warm, low water stresses them, so play and release them quickly.

Highest crests on record

RankLevelDate
172.70 ftJune 1, 1894
267.61 ftJune 7, 1961
366.16 ftJune 1, 1948
465.44 ftJune 23, 1950
565.17 ftMay 22, 1954
664.08 ftMay 29, 1938
758.84 ftJune 2, 1972
857.18 ftJune 20, 2006
956.13 ftJune 11, 2011
1056.03 ftMay 18, 2018

Weather at the gauge

No rain in the last 3 days.

17 Sat 68° 37° – Wind 9 mph
18 Sun 62° 42° – Wind 6 mph
19 Mon 61° 44° – Wind 3 mph
20 Tue 65° 42° – Wind 3 mph
21 Wed 68° 41° 0.00 in Wind 3 mph
22 Thu 64° 47° 0.06 in Wind 4 mph
23 Fri 64° 41° – Wind 4 mph

Forecast: Open-Meteo

Sunrise 07:13 AM Sunset 05:50 PM Daylight 10 hr, 37 min First quarter 60%

Map

Other gauges on the Kootenai River

Gauge Level Compared with normal 24 hours Distance
Kootenai River below Libby Dam near Libby MTRiver gauge, Kootenai River 17.99 ft Below flood stage +0.14 ft 68 mi
Kootenai River at LeoniaRiver gauge, Kootenai River 10.32 ft Very low −0.01 ft 34 mi
Kootenai River at Bonners FerryRiver gauge, Kootenai River 45.24 ft Low ±0 22 mi

Nearby gauges

Gauge Level Compared with normal 24 hours Distance
Boundary Creek near PorthillRiver gauge, Boundary Creek 22.0 cfs Low ±0 2.8 mi
Sullivan Creek near CanyonRiver gauge, Sullivan Creek 0.03 m Very low ±0 13 km
Arrow Creek near EricksonRiver gauge, Arrow Creek 0.30 m Normal ±0 19 km
Moyie River at EastportRiver gauge, Moyie River 3.31 ft Low ±0 15 mi
Kootenay Lake at KuskonookLake, Kootenay Lake 531.44 m Normal +0.01 m 35 km
Kootenai River Bel Moyie River near Bonners FerryRiver gauge, Kootenai River Bel Moyie River 4,960 cfs Normal −20.0 cfs 25 mi
Salmo River near SalmoRiver gauge, Salmo River 0.49 m Low ±0 58 km
Moyie River above Noke CreekRiver gauge, Moyie River 1.78 m Normal ±0 58 km

Questions and answers

Is the Kootenai River at Porthill higher than last year?

Yes, it is 0.07 ft higher than on the same day last year, when the reading was 43.88 ft.

What is a normal level for the Kootenai River at Porthill in mid-October?

The median for mid-October is 45.72 ft. In 8 years out of 10 the reading falls between 43.10 ft and 47.05 ft, based on 66 years of records.

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 Kootenai River at Porthill today?

On Oct 19, 2026, 08:45 AM PDT, the water level was 43.95 ft. Steady over the last 24 hours.

Is Kootenai River at Porthill rising or falling?

Steady over the last 24 hours. Down 0.18 ft over the last 7 days.

Is the level of Kootenai River at Porthill normal?

Low for mid-October. Compared with 66 years of daily readings for this time of year.

What is the highest water level ever recorded at Kootenai River at Porthill?

The highest level on record is 72.70 ft on June 1, 1894. The lowest is 38.21 ft on April 3, 1944.

For specialists

Station codes, datum, parameters, data quality and downloads
Operator
U.S. Geological Survey
Station code
usgs:12322000 (Agency page)
Coordinates
48.99639, -116.50750 (WGS84)
Vertical datum
NGVD29
Update interval
every 15 minutes
Licence
Public domain. Data: U.S. Geological Survey (USGS), provisional data subject to revision

Published series

ParameterLast valueTime (UTC)Quality
Water level 43.95 ft 2026-10-19 15:45 Provisional
Flow 4,490 cfs 2026-10-19 15:45 Provisional
Water temperature 50 °F 2026-10-19 15:45 Provisional

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How to cite

U.S. Geological Survey: Kootenai River at Porthill (usgs:12322000). Accessed October 19, 2026 via Nivelmap, https://nivelmap.com/en/united-states/idaho/kootenai-river-at-porthill

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.