Rivermatics

USGS Streamgage 12323840

Lost Creek near Anaconda, MT

Lost Creek near Anaconda, MT is USGS streamgage 12323840 in Montana, monitoring river discharge in hydrologic subbasin 17010201. It sits on the Lost Creek, alongside 1 other gauge Rivermatics tracks on the same river. It drains a watershed of about 27 square miles. Discharge records at this site go back to 2004. Typical flow runs near 6.9 cfs in July and 6.4 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
Drainage area
27 sq mi
Gauge elevation
5,075 ft
Subbasin (HUC-8)
17010201
Coordinates
46.16132, -112.8938
USGS site number
12323840
Records begin
2004-10-01 (22 years)
Rivermatics forecast
14-day flow outlook

14-day flow forecast

Based on observations through for Lost Creek near Anaconda, 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
1.3 1.6 1.8
1.1 1.5 1.7
0.9 1.4 1.7
0.8 1.4 1.7
0.7 1.3 1.7
0.6 1.3 1.7
0.4 1.3 1.7
0.3 1.2 1.7
0.4 1.2 1.7
0.3 1.1 1.7
0.2 1.1 1.6
0.1 1 1.6
0.1 1 1.6
0.1 0.9 1.5

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 22 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 3.5 5.2 7.3
February 3.2 5.2 7
March 3.1 5.4 7.8
April 3.6 6.4 12.2
May 4.1 9.9 31.7
June 7.6 19.8 56.3
July 1.5 6.9 25.7
August 1 7.4 17.4
September 0.2 1.1 8.9
October 1.9 5.1 11.1
November 4.1 6.7 10.4
December 3.5 5.6 8.3

All values in cubic feet per second (cfs).

Common questions

When does Lost Creek near Anaconda, MT normally run highest?
June, on the long-term record. The median daily flow that month is about 19.8 cfs, against 1.1 cfs in September, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
What is a normal flow for Lost Creek near Anaconda, MT?
It depends on the month. In January, half of days historically fall near 5.2 cfs, with the middle 80% of days between 3.5 and 7.3 cfs. The month-by-month table on this page gives the full range.
How long has Lost Creek near Anaconda, MT been measured?
Discharge records at USGS site 12323840 begin in 2004, about 22 years, covering roughly 7,976 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
Is there a flow forecast for Lost Creek near Anaconda, 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 Lost Creek near Anaconda, MT?
The gauge sits at 46.16132, -112.8938, in Montana, in hydrologic subbasin 17010201, at an elevation of about 5,075 feet, draining roughly 27 square miles.
Can I use Lost Creek near Anaconda, 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 Lost Creek

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

Other gauges in this subbasin