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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 0.7 13 134 21 23 13 3 0.66 2.6 2.9 1.6
2 0.88 0.73 23 94 21 16 9.3 1.9 0.65 3.7 3.4 1.6
3 0.86 0.73 25 71 19 12 12 1.4 0.66 2.9 3.2 1.6
4 0.83 0.68 26 75 18 22 12 1.1 0.65 2.4 3 1.5
5 0.81 0.68 44 88 17 18 25 1.3 0.64 4.5 2.8 1.5
6 0.79 0.65 47 128 24 11 18 2 0.8 3.3 2.7 1.5
7 0.78 0.64 40 162 39 13 17 1.5 2.2 2.7 2.7 1.5
8 0.8 0.63 29 127 26 25 14 1.1 6.1 2.5 2.7 1.4
9 0.8 0.64 27 122 19 16 7.6 1.9 2.2 2.3 2.8 1.4
10 0.8 0.79 26 122 18 25 8 1.4 2.1 2.3 2.5 1.4
11 0.77 1.2 32 141 14 19 14 1.2 3 2.3 2.4 1.4
12 0.75 1.5 41 156 15 22 9.8 1.1 2 2.2 2.4 1.4
13 0.75 1.7 61 125 13 16 7.1 1.2 2.6 2.2 2.3 1.4
14 0.74 1.7 59 118 13 19 5.7 1.3 2 2.3 2.3 1.4
15 0.71 1.5 64 86 13 19 8 1.6 1.5 2.2 2.3 1.3
16 0.7 1.5 67 75 12 17 5.5 1.5 1.3 2.3 2.3 1.3
17 0.69 5.5 87 77 11 14 4.1 1.4 1.2 2.5 2.3 1.2
18 0.68 16 82 72 11 19 3.5 1.2 1.1 2.5 2.2 1.2
19 0.69 13 88 61 11 16 4.3 1 1.3 2.4 2.1 1.2
20 0.69 12 91 52 12 12 4.2 1.3 2 2.4 2.1 1.2
21 0.69 8.9 82 44 13 12 3.7 2.8 2.8 2.3 2 1.2
22 0.71 9.4 79 50 14 13 2.9 1.3 2.8 2.3 2 1.2
23 0.73 6.2 92 49 13 13 2.3 0.97 2 2.3 2 1.1
24 0.71 5.3 112 45 26 15 2.1 1.1 2.1 2.3 1.9 1.1
25 0.71 4.5 112 40 18 17 2.1 2.2 2.1 2.4 1.9 1
26 0.7 4.3 106 39 17 12 12 2.2 2.1 2.3 1.8 1
27 0.72 4 120 36 14 10 4.1 1.4 2.3 2.3 1.8 1
28 0.72 11 132 33 33 12 3.2 1.2 1.8 2.4 1.8 1
29 0.69 35 156 29 33 24 5.6 1 1.5 2.4 1.8 0.99
30 0.7   187 24 16 23 5.2 0.85 1.6 2.4 1.7 0.97
31 0.69   184   19   3.1 0.75   2.6   0.94