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USGS Daily Statistics for Montana

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Questions or concerns about USGS streamflow data in Montana and Wyoming can be directed to Kirk Miller (kmiller@usgs.gov; 307-775-9168).

Updated September 18, 2020 - USGS water-resources monitoring activities were restored effective August 17, 2020 at the following site:
  • 06088500 Muddy Creek near Vaughn, Montana (POR: 82 years)

Updated June 11, 2020 - USGS water-resources monitoring activities will be restored at the following sites:
  • 12323600 Silver Bow Creek at Opportunity, Montana (POR: 31 years)
  • 12323750 Silver Bow Creek at Warm Springs, Montana (POR: 35 years)


The statistics generated from this site are based on approved daily-mean data and may not match those published by the USGS in official publications. The user is responsible for assessment and use of statistics from this site. For more details on why the statistics may not match, click here.

USGS 12323700 Mill Creek at Opportunity, MT


Deer Lodge County, Montana
Hydrologic Unit Code 17010201
Latitude  46°06'51.76", Longitude 112°49'11.19" NAD83
Drainage area 42.5  square miles
Gage datum 04,940 feet above NAVD88
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00060, Discharge, cubic feet per second,
Day of
month
Mean of daily mean values for each day for water year of record in, ft3/s   (Calculation Period 2002-10-01 -> 2020-09-30)

Calculation period restricted by USGS staff due to special conditions at/near site
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
1 4.5 5.4 5.8 12 28 101 63 12 4.6 4.6 7.3 5.5
2 4.8 5.2 5.9 11 27 98 59 12 4.5 4.7 7.3 5.7
3 5 5.2 5.9 11 28 100 57 11 4 4.4 7.6 5.5
4 5.1 5.4 6 11 28 103 55 10 3.9 4.6 7.3 5
5 5.2 5.7 6.2 12 30 103 52 9.4 4.1 5.4 7 4.9
6 5.1 5.6 6.6 12 33 105 48 9 4 5.2 7 4.5
7 5.3 6.2 6.6 13 37 102 46 8.9 3.9 5.3 6.8 4.3
8 5.4 6.7 6.4 14 38 105 44 8.6 3.9 5.4 7.2 4.2
9 5.7 6.5 6.7 15 41 99 41 8.5 4.5 5.6 6.5 4.3
10 5.4 6.6 8.1 14 42 96 39 7.1 4.3 5.5 6.5 4.5
11 5.3 6.7 7.6 14 44 92 38 6.9 4.1 5.7 6.1 4.6
12 5 6.8 7.2 15 46 87 36 6.2 3.9 5.7 6 4.8
13 5.2 6.5 7.4 15 49 89 35 6 3.8 5.6 6.1 4.6
14 5.4 6.4 7.8 15 51 83 35 6.2 3.8 5.6 6.3 4.5
15 5.1 6.4 8.6 15 52 78 33 5.6 4.3 5.7 6.4 4.5
16 5.2 6.4 9.9 15 55 78 30 5.3 4.5 6.2 6.8 4.2
17 5.7 6.1 9.7 15 61 80 29 4.7 4.5 5.9 6.6 4.1
18 5.8 5.8 9.7 16 66 79 28 4.2 4.3 5.6 7 4.4
19 5.8 5.9 10 17 69 78 26 3.9 4.3 6.1 6.9 4.4
20 5.8 5.7 9.9 18 75 78 24 3.8 4.4 6.4 6.7 4.5
21 6.3 5.7 10 20 74 78 23 3.9 4.3 6.6 7 4.9
22 6.3 5.6 10 21 76 77 22 4.2 4.3 7 6.7 4.9
23 6.1 5.7 10 24 80 76 20 6.4 4.1 7.1 7.3 4.8
24 5.9 5.7 10 25 85 74 19 6.6 4.1 7.5 7.6 5.1
25 5.9 5.6 9.9 25 90 72 18 6.1 4 7.4 6.6 5.1
26 6 5.6 9.8 27 90 71 17 5.7 4 7.2 6.2 5.1
27 5.8 5.9 9.7 28 90 70 16 5.3 3.9 7.5 6.4 5
28 5.6 6 9.7 28 92 65 15 4.9 3.8 7.3 6.1 5
29 5.3 4.5 9.7 28 97 65 14 4.8 4.1 7.6 6 4.8
30 5.3   10 28 97 66 13 5 4.5 7.6 5.8 4.6
31 5.5   11   98   12 4.8   7.2   4.7