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USGS Daily Statistics for South Dakota

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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 06479525 BIG SIOUX RIVER NEAR CASTLEWOOD,SD


Hamlin County, South Dakota
Hydrologic Unit Code 10170201
Latitude  44°43'53.7", Longitude  97°02'39.5" NAD27
Drainage area 1,096  square miles
Contributing drainage area 579  square miles
Gage datum 1,668.48 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 1976-10-01 -> 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 24 20 46 356 299 189 113 85 49 54 68 44
2 23 19 45 362 290 176 116 80 54 58 68 43
3 22 20 43 345 274 162 113 84 55 55 65 41
4 22 20 43 332 265 159 113 87 53 54 65 39
5 22 20 43 342 258 160 121 85 52 54 63 37
6 21 20 45 356 259 161 134 90 50 54 60 36
7 21 20 47 372 259 155 138 94 49 52 58 35
8 21 20 52 404 262 156 134 92 50 50 57 35
9 21 20 54 401 274 151 128 92 53 50 54 36
10 21 20 60 401 277 144 120 107 52 56 55 36
11 20 21 72 404 264 148 116 107 51 60 52 34
12 20 21 88 418 252 149 115 95 54 55 52 34
13 21 24 126 419 247 150 109 88 62 55 52 34
14 21 24 139 405 243 142 103 85 61 54 52 34
15 20 24 163 399 236 144 104 83 57 56 51 33
16 21 24 186 388 228 164 100 82 68 55 51 32
17 20 28 208 378 220 183 97 78 63 57 49 32
18 19 34 223 370 212 162 97 83 56 58 48 31
19 19 40 235 384 210 151 98 88 53 60 47 30
20 19 43 234 385 205 144 94 81 52 58 46 29
21 19 41 212 372 198 147 91 84 54 58 45 29
22 19 39 218 376 198 164 88 86 52 59 45 28
23 20 48 251 378 198 179 87 89 53 59 45 27
24 19 58 266 369 191 165 88 87 60 58 44 27
25 19 58 277 350 183 145 94 74 57 56 43 26
26 19 54 281 332 176 136 97 67 53 57 42 26
27 20 51 318 321 168 130 92 56 50 59 44 26
28 20 49 342 315 171 127 103 60 49 65 45 26
29 19 70 336 312 171 122 110 57 48 72 45 26
30 20   337 305 165 116 100 52 49 69 46 25
31 20   344   178   91 52   68   25