Rivermatics

USGS Streamgage 13066000

Blackfoot River near Shelley, ID

Blackfoot River near Shelley, ID is USGS streamgage 13066000 in Idaho, monitoring river discharge in hydrologic subbasin 17040207. It sits on the Blackfoot River, alongside 3 other gauges Rivermatics tracks on the same river. It drains a watershed of about 897 square miles. Discharge records at this site go back to 1903. Typical flow runs near 714.4 cfs in July and 207.9 cfs in April, with the higher of the two arriving in July. 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
897 sq mi
Subbasin (HUC-8)
17040207
Coordinates
43.26278, -112.04778
USGS site number
13066000
Records begin
1903-04-27 (123 years)
Rivermatics forecast
14-day flow outlook

14-day flow forecast

Based on observations through for Blackfoot River near Shelley, 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
242 261 273
231 258 273
224 258 277
215 256 280
207 254 283
188 249 284
170 245 286
169 244 288
166 242 291
153 239 293
156 240 298
149 237 297
141 233 295
143 234 297

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 117 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 50.7 79.5 185.7
February 56.1 87.6 210.6
March 72.5 106.8 374.6
April 96.1 207.9 748.7
May 163.1 452.1 1,228.7
June 298.8 675 1,261.7
July 371.2 714.4 1,020.1
August 277.4 551.5 815.1
September 161.6 353.1 633.7
October 77.3 133.5 390.4
November 62.3 92.3 326.3
December 51.7 82.2 195.9

All values in cubic feet per second (cfs).

Common questions

When does Blackfoot River near Shelley, ID normally run highest?
July, on the long-term record. The median daily flow that month is about 714.4 cfs, against 79.5 cfs in January, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
What is a normal flow for Blackfoot River near Shelley, ID?
It depends on the month. In January, half of days historically fall near 79.5 cfs, with the middle 80% of days between 50.7 and 185.7 cfs. The month-by-month table on this page gives the full range.
How long has Blackfoot River near Shelley, ID been measured?
Discharge records at USGS site 13066000 begin in 1903, about 123 years, covering roughly 9,200 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
Is there a flow forecast for Blackfoot River near Shelley, 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 Blackfoot River near Shelley, ID?
The gauge sits at 43.26278, -112.04778, in Idaho, in hydrologic subbasin 17040207, draining roughly 897 square miles.
Can I use Blackfoot River near Shelley, 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 Blackfoot River

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

Other gauges in this subbasin