Rivermatics

USGS Streamgage 13074400

Portneuf River. at Inkom, ID

Portneuf River. at Inkom, ID is USGS streamgage 13074400 in Idaho, monitoring river discharge in hydrologic subbasin 17040208. It sits on the Portneuf River, alongside 5 other gauges Rivermatics tracks on the same river. It drains a watershed of about 1,065 square miles. Discharge records at this site go back to 2024. Typical flow runs near 76.2 cfs in July and 753.8 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.

View live conditions & forecast →

Gauge details

State
Idaho
Drainage area
1,065 sq mi
Subbasin (HUC-8)
17040208
Coordinates
42.79183, -112.25207
USGS site number
13074400
Records begin
2024-04-02 (2 years)
Rivermatics forecast
14-day flow outlook

14-day flow forecast

Based on observations through for Portneuf River. at Inkom, 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
43.5 44.9 46.7
42.2 44.5 47.3
40.9 43.9 47.7
40 43.6 48.3
39.3 43.6 49.4
38.9 43.8 50.9
38.7 44.5 53.9
38.2 45.8 61.7
38 46.2 64.5
36.9 46.5 71.1
36.4 46.8 75
36.2 47.2 76.7
35.8 47.4 79.6
35.5 47.5 82

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 1 years of data), averaged within each month. These describe the historical normal range — they are not a forecast and not today's reading.

Only 7 of 12 months have enough record to summarize; the rest are omitted.

Historical monthly discharge percentiles in cubic feet per second
Month Low p10 Typical p50 High p90 Range
April — 753.8 —
May — 583.5 —
June — 167.7 —
July — 76.2 —
August — 101.3 —
September — 140.4 —
October — 224 —

All values in cubic feet per second (cfs).

Common questions

When does Portneuf River. at Inkom, ID normally run highest?
April, on the long-term record. The median daily flow that month is about 753.8 cfs, against 76.2 cfs in July, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
How long has Portneuf River. at Inkom, ID been measured?
Discharge records at USGS site 13074400 begin in 2024, about 2 years, covering roughly 857 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
Is there a flow forecast for Portneuf River. at Inkom, 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. 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 Portneuf River. at Inkom, ID?
The gauge sits at 42.79183, -112.25207, in Idaho, in hydrologic subbasin 17040208, draining roughly 1,065 square miles.
Can I use Portneuf River. at Inkom, 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 Portneuf River

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

Other gauges in this subbasin