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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 06185110 Big Muddy Creek nr mouth nr Culbertson MT


Roosevelt County, Montana
Hydrologic Unit Code 10060006
Latitude  48°09'52.13", Longitude 104°37'46.27" NAD83
Drainage area 2,717  square miles
Gage datum 1,896.5 feet above NGVD29
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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 1981-10-01 -> 2025-09-30)

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 5.5 3.7 37 116 145 75 52 21 12 16 12 12
2 5.6 4.5 41 114 135 77 48 18 10 17 13 12
3 5.6 4.4 61 120 125 80 45 17 9.9 18 13 12
4 5.5 4.5 57 116 119 90 43 18 9.8 19 12 12
5 5.5 4.3 50 116 112 96 43 18 15 20 12 12
6 5.5 4.1 48 120 102 98 44 19 18 20 12 12
7 5.4 4 51 115 85 96 43 25 18 20 12 12
8 5.4 3.9 56 114 75 96 42 23 18 21 12 12
9 5.1 3.9 64 116 69 93 41 20 19 23 13 12
10 4.8 4.2 72 118 67 84 42 18 19 23 13 12
11 4.7 4.3 70 119 65 74 44 17 19 22 12 12
12 4.6 4.4 69 143 62 68 46 17 21 20 12 11
13 4.2 4.3 69 155 61 62 43 17 22 18 12 11
14 3.9 4 72 184 60 56 41 16 23 16 12 11
15 3.5 3.9 74 202 59 54 42 18 24 16 11 11
16 3.4 3.9 68 214 58 50 44 19 25 16 12 10
17 3.3 4.2 81 205 59 48 44 19 25 15 12 9.7
18 3.3 4.6 96 187 60 46 44 18 24 15 12 9.3
19 3.2 4.8 115 179 63 44 43 18 23 15 12 8.6
20 3.2 4.8 132 172 66 43 39 17 22 15 12 8.1
21 3.3 5.5 163 166 66 43 36 16 22 15 12 8
22 3.3 7 161 157 62 48 35 14 19 15 12 7.9
23 3.3 9.3 142 149 60 59 32 13 15 15 12 7.9
24 3.3 12 142 152 58 63 30 13 13 15 13 7.7
25 3.3 16 141 153 57 61 27 12 13 14 12 7.2
26 3.2 23 142 148 55 58 25 12 13 13 12 6.8
27 3.3 27 136 142 52 55 24 13 13 11 12 6
28 3.3 27 130 141 54 51 22 14 12 10 12 6
29 3.4 28 124 144 53 49 20 15 12 9.3 12 5.9
30 3.4   122 148 54 53 19 15 15 13 12 5.8
31 3.5   119   65   20 13   12   5.5