Rivermatics

USGS Streamgage 06138580

Big Sandy Creek ab Spring Coulee, near Laredo, MT

Big Sandy Creek ab Spring Coulee, near Laredo, MT is USGS streamgage 06138580 in Montana, monitoring river discharge in hydrologic subbasin 10050005. It sits on the Big Sandy Creek, alongside 1 other gauge Rivermatics tracks on the same river. Discharge records at this site go back to 2020. Typical flow runs near 10.2 cfs in July and 9.6 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
Montana
Gauge elevation
2,562 ft
Subbasin (HUC-8)
10050005
Coordinates
48.45269, -109.92083
USGS site number
06138580
Records begin
2020-09-24 (6 years)
Rivermatics forecast
14-day flow outlook

14-day flow forecast

Based on observations through for Big Sandy Creek ab Spring Coulee, near Laredo, MT. 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
11 12.2 13.7
10.4 12.1 14.8
9.8 11.7 15
9.4 11.4 15.2
9.1 11.1 15
9.1 11.6 17.5
8.8 11.2 17.6
8.3 10.9 18.1
7.9 10.5 17.6
7.7 10.3 17.3
7.6 10.2 16.8
7.6 10.2 16.4
7.5 10.1 15.7
7.1 9.8 15.2

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 6 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 — 3.7 —
February — 6.9 —
March — 13.5 —
April — 9.6 —
May — 15.7 —
June — 16 —
July — 10.2 —
August — 4.7 —
September — 2.5 —
October — 1.5 —
November — 2.8 —
December — 2 —

All values in cubic feet per second (cfs).

Common questions

When does Big Sandy Creek ab Spring Coulee, near Laredo, MT normally run highest?
June, on the long-term record. The median daily flow that month is about 16 cfs, against 1.5 cfs in October, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
How long has Big Sandy Creek ab Spring Coulee, near Laredo, MT been measured?
Discharge records at USGS site 06138580 begin in 2020, about 6 years, covering roughly 2,141 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
Is there a flow forecast for Big Sandy Creek ab Spring Coulee, near Laredo, MT?
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 Big Sandy Creek ab Spring Coulee, near Laredo, MT?
The gauge sits at 48.45269, -109.92083, in Montana, in hydrologic subbasin 10050005, at an elevation of about 2,562 feet.
Can I use Big Sandy Creek ab Spring Coulee, near Laredo, MT 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 Big Sandy Creek

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

Other gauges in this subbasin