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USGS Daily Statistics for Montana

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Questions or concerns about USGS data and data products in Montana and Wyoming can be directed to the Wyoming-Montana Water Science Center Data Management Section.


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 06169500 Rock Creek bl Horse Creek nr int'l boundary


Valley County, Montana
Hydrologic Unit Code 10050015
Latitude  48°58'09.75", Longitude 106°50'23.43" NAD83
Drainage area 322  square miles
Gage datum 2,530 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 1955-10-01 -> 2024-09-30)

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 0.89 0.71 13 135 21 23 13 3.1 0.66 2.6 2.9 1.6
2 0.88 0.74 23 93 21 16 9.4 1.9 0.65 3.7 3.4 1.6
3 0.86 0.73 25 69 19 12 12 1.4 0.66 2.9 3.2 1.6
4 0.83 0.68 27 73 18 22 12 1.1 0.65 2.4 3 1.5
5 0.81 0.68 45 88 17 18 25 1.3 0.64 4.5 2.8 1.5
6 0.79 0.65 48 129 25 11 18 2.1 0.8 3.3 2.7 1.5
7 0.78 0.64 41 164 38 13 17 1.5 2.2 2.7 2.7 1.5
8 0.8 0.63 29 128 24 25 14 1.1 6.1 2.5 2.7 1.4
9 0.8 0.64 27 124 18 16 7.5 1.9 2.2 2.3 2.8 1.4
10 0.8 0.8 26 124 18 26 8 1.4 2.1 2.3 2.5 1.4
11 0.78 1.3 27 143 14 19 14 1.3 3 2.3 2.4 1.4
12 0.77 1.5 33 159 15 22 9.9 1.1 2 2.2 2.4 1.4
13 0.76 1.7 53 127 13 16 7.2 1.2 2.6 2.2 2.3 1.4
14 0.75 1.8 52 119 13 19 5.8 1.3 2 2.3 2.3 1.3
15 0.72 1.5 60 88 13 19 8.1 1.6 1.5 2.2 2.3 1.3
16 0.71 1.5 65 76 12 17 5.6 1.5 1.3 2.3 2.3 1.3
17 0.7 5.6 87 78 11 14 4.1 1.4 1.2 2.5 2.3 1.2
18 0.69 16 82 73 11 19 3.6 1.2 1.1 2.5 2.2 1.2
19 0.7 13 88 62 11 16 4.3 1 1.3 2.4 2.1 1.2
20 0.7 12 92 53 12 12 4.3 1.3 2 2.4 2.1 1.2
21 0.7 9 83 45 13 12 3.7 2.8 2.8 2.3 2 1.2
22 0.72 9.6 80 50 14 13 3 1.3 2.8 2.3 2 1.1
23 0.74 6.3 94 50 13 12 2.4 0.97 2 2.3 2 1.1
24 0.72 5.4 114 46 26 14 2.1 1.1 2.1 2.3 1.9 1.1
25 0.72 4.5 113 40 18 16 2.1 2.2 2.1 2.4 1.9 1
26 0.71 4.3 108 39 18 12 12 2.2 2.1 2.3 1.8 1
27 0.73 4 122 36 14 10 4.2 1.4 2.3 2.3 1.8 1
28 0.73 11 134 33 34 12 3.2 1.2 1.8 2.4 1.8 1
29 0.69 37 159 29 33 25 5.6 1 1.5 2.4 1.8 0.99
30 0.7   190 24 16 24 5.2 0.85 1.6 2.4 1.7 0.97
31 0.69   187   19   3.1 0.75   2.6   0.94