Rivermatics

USGS Streamgage 12322000

Kootenai River at Porthill, ID

Kootenai River at Porthill, ID is USGS streamgage 12322000 in Idaho, monitoring river discharge in hydrologic subbasin 17010104. It sits on the Kootenai River, alongside 4 other gauges Rivermatics tracks on the same river. It drains a watershed of about 13,700 square miles. Discharge records at this site go back to 1894. Typical flow runs near 11,087.1 cfs in July and 12,786.7 cfs in April, with the higher of the two arriving in April. Rivermatics issues a daily machine-learned flow outlook for this gauge, reaching 14 days ahead, alongside daily high and low water-temperature forecasts.

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Gauge details

State
Idaho
Drainage area
13,700 sq mi
Gauge elevation
1,766 ft
Subbasin (HUC-8)
17010104
Coordinates
48.99639, -116.5075
USGS site number
12322000
Records begin
1894-01-01 (132 years)
Rivermatics forecast
14-day flow outlook + water temperature

14-day flow forecast

Based on observations through for Kootenai River at Porthill, ID. Each day carries a median estimate and the band the model expects the flow to fall within — not a single number to plan against. Forecasts are re-issued daily; see the live screen for the current outlook.

Forecast daily mean discharge in cubic feet per second, by date
Date Low p10 Expected p50 High p90 Range
6,584 7,055 7,522
6,481 7,125 7,930
6,402 7,209 8,308
6,346 7,233 8,445
6,273 7,212 8,478
6,197 7,175 8,502
6,131 7,135 8,501
6,084 7,119 8,546
6,039 7,098 8,557
6,037 7,093 8,545
6,014 7,093 8,588
5,954 7,076 8,630
5,965 7,077 8,561
5,932 7,021 8,476

All values in cubic feet per second (cfs). Estimates only — do not use them for navigation or for any safety, rescue, or emergency decision.

Typical flow by month

Long-term daily discharge percentiles from the USGS record (up to 13 years of data), averaged within each month. These describe the historical normal range — they are not a forecast and not today's reading.

Historical monthly discharge percentiles in cubic feet per second
Month Low p10 Typical p50 High p90 Range
January 4,967.7 6,571 22,125.8
February 4,983.6 7,248.6 20,021.4
March 5,713.5 9,414.2 25,977.4
April 8,287 12,786.7 36,070
May 18,658.1 29,435.5 41,745.2
June 13,180.3 20,473.3 34,850
July 8,011.6 11,087.1 19,919.4
August 7,373.2 9,043.5 11,793.5
September 6,505 7,646.7 9,715
October 4,534.2 5,117.7 8,697.1
November 5,498 13,550 23,860
December 8,554.5 21,146.5 30,083.9

All values in cubic feet per second (cfs).

Common questions

When does Kootenai River at Porthill, ID normally run highest?
May, on the long-term record. The median daily flow that month is about 29,435.5 cfs, against 5,117.7 cfs in October, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
What is a normal flow for Kootenai River at Porthill, ID?
It depends on the month. In January, half of days historically fall near 6,571 cfs, with the middle 80% of days between 4,967.7 and 22,125.8 cfs. The month-by-month table on this page gives the full range.
How long has Kootenai River at Porthill, ID been measured?
Discharge records at USGS site 12322000 begin in 1894, about 132 years, covering roughly 8,475 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
Is there a flow forecast for Kootenai River at Porthill, ID?
Yes. Rivermatics trains a machine-learned model — a temporal-fusion transformer — on this basin's observed flows, weather, and snowpack, and issues a daily flow outlook reaching 14 days ahead: a median estimate inside a confidence band, not a single number to bet on. A companion model forecasts each day's water-temperature high and low. Every forecast is scored against days the model never trained on, and that track record is published on the live gauge screen. Open live conditions to see the current outlook.
Where is Kootenai River at Porthill, ID?
The gauge sits at 48.99639, -116.5075, in Idaho, in hydrologic subbasin 17010104, at an elevation of about 1,766 feet, draining roughly 13,700 square miles.
Can I use Kootenai River at Porthill, ID data for flood or safety decisions?
No. Rivermatics provides estimates, not guarantees, and the readings and forecasts here may be delayed, inaccurate, or wrong. Do not use them for navigation or for any safety, rescue, or emergency decision. Check the National Weather Service and USGS directly, and use your own judgment.

Upstream and downstream on the Kootenai River

Every gauge Rivermatics tracks on this river, ordered by drainage area — upstream first. See the Kootenai River in full.

Other gauges in this subbasin