Rivermatics

USGS Streamgage 12323700

Mill Creek at Opportunity, MT

Mill Creek at Opportunity, MT is USGS streamgage 12323700 in Montana, monitoring river discharge in hydrologic subbasin 17010201. It sits on the Mill Creek, alongside 1 other gauge Rivermatics tracks on the same river. It drains a watershed of about 42 square miles. Discharge records at this site go back to 2003. Typical flow runs near 22.6 cfs in July and 13.6 cfs in April, with the higher of the two arriving in July.

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Gauge details

State
Montana
Drainage area
42 sq mi
Gauge elevation
4,965 ft
Subbasin (HUC-8)
17010201
Coordinates
46.1136, -112.82806
USGS site number
12323700
Records begin
2003-04-01 (23 years)

14-day flow forecast

Based on observations through for Mill Creek at Opportunity, 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
1.7 2 2.4
1.6 1.9 2.3
1.4 1.8 2.3
1.3 1.8 2.2
1.3 1.7 2.2
1.2 1.7 2.4
1.2 1.7 2.4
1.1 1.6 2.3
1 1.6 2.2
0.9 1.5 2.2
0.8 1.4 2.1
0.8 1.4 2
0.8 1.3 2
0.7 1.3 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 23 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 0.6 5.1 9.3
February 0.6 5.4 9.9
March 0.9 7.1 17.3
April 1.5 13.6 34.4
May 9.1 49.1 118
June 25.1 71.4 155.3
July 3.1 22.6 59.5
August 1.2 3.6 13.7
September 0.6 2 9.8
October 0.7 4.7 12.1
November 1.2 5.7 12.7
December 0.9 4.4 9.2

All values in cubic feet per second (cfs).

Common questions

When does Mill Creek at Opportunity, MT normally run highest?
June, on the long-term record. The median daily flow that month is about 71.4 cfs, against 2 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 Mill Creek at Opportunity, MT?
It depends on the month. In January, half of days historically fall near 5.1 cfs, with the middle 80% of days between 0.6 and 9.3 cfs. The month-by-month table on this page gives the full range.
How long has Mill Creek at Opportunity, MT been measured?
Discharge records at USGS site 12323700 begin in 2003, about 23 years, covering roughly 8,529 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
Where is Mill Creek at Opportunity, MT?
The gauge sits at 46.1136, -112.82806, in Montana, in hydrologic subbasin 17010201, at an elevation of about 4,965 feet, draining roughly 42 square miles.
Can I use Mill Creek at Opportunity, 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 Mill Creek

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

Other gauges in this subbasin