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USGS Daily Statistics for the Nation

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 46 362 303 191 104 75 49 54 69 45
2 23 20 46 368 293 178 109 71 54 58 69 43
3 23 20 44 351 278 164 106 75 55 55 66 41
4 22 20 43 338 268 161 107 79 53 54 66 40
5 22 20 43 347 262 162 114 78 52 54 64 38
6 21 20 46 362 262 163 128 79 50 54 61 36
7 21 20 48 378 263 157 133 77 49 52 58 35
8 21 20 53 411 266 158 129 76 50 50 57 35
9 21 20 54 408 278 153 123 79 53 50 55 37
10 21 20 61 407 282 146 115 97 52 56 55 36
11 21 21 73 411 268 149 111 98 51 60 53 35
12 21 22 89 425 257 151 110 86 54 55 53 34
13 21 25 128 425 251 151 105 79 62 55 53 34
14 21 24 141 411 247 142 100 76 61 54 53 34
15 20 24 165 405 239 144 101 74 57 57 52 33
16 21 24 189 394 231 164 95 73 68 56 51 32
17 20 29 212 384 223 184 91 69 63 58 50 32
18 20 35 227 376 215 162 92 74 56 59 49 31
19 19 41 239 390 213 151 93 79 53 61 48 30
20 19 43 238 391 206 143 89 73 52 58 47 29
21 19 42 216 378 198 147 86 76 54 59 45 29
22 20 40 222 382 198 164 83 73 52 60 46 28
23 20 49 256 384 197 180 82 64 53 60 46 28
24 20 59 271 375 191 167 81 60 60 59 45 27
25 20 59 282 355 183 144 87 57 57 57 44 27
26 20 55 286 338 176 133 91 55 53 58 43 26
27 20 52 324 326 169 124 86 56 50 60 44 26
28 20 50 349 320 172 118 82 60 49 66 46 26
29 20 70 343 316 172 111 82 57 48 73 46 26
30 20   343 309 166 105 77 52 49 70 46 25
31 20   350   179   77 52   69   25