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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 06471500 ELM RIVER AT WESTPORT,SD


Brown County, South Dakota
Hydrologic Unit Code 10160004
Latitude  45°39'22", Longitude  98°29'48" NAD27
Drainage area 1,505  square miles
Contributing drainage area 1,210  square miles
Gage datum 1,310.04 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 1945-10-01 -> 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 4.6 4 25 353 139 70 89 37 18 9.1 18 13
2 4.5 4.3 28 372 149 61 89 33 16 9 17 13
3 4.4 4.4 34 400 152 55 92 32 16 8.8 17 13
4 4.2 4.4 41 403 156 52 92 39 16 8.4 16 12
5 4.2 4.6 33 425 160 52 81 34 14 8.7 15 11
6 4.2 5 31 425 153 53 78 32 14 9.4 15 10
7 4.2 5.6 30 390 136 53 85 29 14 9.7 13 9.6
8 6.6 6 27 404 134 53 103 27 13 9.7 12 9
9 6.1 5.8 30 468 148 54 113 25 15 11 12 8.6
10 4.8 5.7 42 514 175 79 117 26 15 12 11 8.2
11 4.6 6 49 474 191 97 120 25 14 12 11 7.9
12 4.5 5.9 58 468 187 91 106 24 14 12 10 7.7
13 4.4 5.7 71 416 185 84 93 29 14 12 11 7.4
14 4.3 5.8 104 365 178 87 93 34 15 12 11 7.2
15 4 6 198 335 157 86 93 35 14 12 11 6.9
16 3.9 6.5 256 324 135 82 86 33 14 11 10 6.7
17 3.8 8 329 312 119 82 76 29 13 12 9.8 6.4
18 3.9 10 311 305 109 83 65 29 14 14 9.8 6.2
19 3.8 21 319 309 102 80 56 28 14 14 9.5 6.1
20 3.8 33 319 297 99 91 51 27 14 14 9.6 5.9
21 3.8 31 309 291 97 116 52 24 13 18 9.5 5.7
22 3.9 36 317 277 87 163 53 23 12 20 9.1 5.5
23 3.8 38 332 262 88 190 49 21 11 22 8.8 5.4
24 3.9 32 367 228 93 190 43 19 11 23 9.1 5.4
25 4 31 398 199 88 170 39 19 9.9 24 9.6 5.3
26 4 28 384 176 86 145 92 19 9.5 27 9.7 5.2
27 3.9 27 397 161 90 127 112 21 9.1 28 10 5.1
28 3.9 30 443 152 83 111 80 22 8.8 26 11 5.1
29 3.8 31 441 146 81 110 64 23 8.5 22 12 5
30 3.8   423 145 75 105 52 23 8.7 21 13 4.9
31 3.8   379   74   42 20   20   4.7