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USGS Daily Statistics for Idaho

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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 13120000 NF BIG LOST RIVER AT WILD HORSE NR CHILLY ID


Custer County, Idaho
Hydrologic Unit Code 17040218
Latitude  43°55'58", Longitude 114°06'50" NAD83
Drainage area 115  square miles
Gage datum 6,861.97 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 1943-10-01 -> 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 22 20 29 119 420 296 95 46 40 36 27
2 24 22 20 29 126 419 290 91 45 40 35 26
3 24 22 20 30 136 428 281 90 44 40 35 26
4 24 22 20 32 148 447 273 88 43 40 34 26
5 24 22 20 33 156 474 263 85 44 40 34 25
6 24 21 21 36 172 472 255 80 47 39 33 25
7 24 22 21 38 189 462 246 77 47 39 33 25
8 24 22 21 39 196 456 238 76 46 39 33 25
9 24 22 21 41 199 450 234 73 47 38 32 25
10 24 22 21 42 202 440 228 71 46 38 32 25
11 24 21 21 44 208 427 217 69 46 39 32 25
12 23 22 21 45 219 423 205 68 47 38 33 25
13 23 22 21 47 228 425 196 67 45 38 32 25
14 23 21 21 50 238 412 188 64 44 38 31 25
15 24 21 22 53 255 405 178 62 45 38 30 25
16 24 21 22 54 275 404 169 61 44 38 30 25
17 24 21 22 58 295 400 162 60 43 38 30 24
18 24 21 22 61 308 397 155 58 43 37 30 24
19 23 21 23 64 325 389 148 58 44 37 30 24
20 23 21 23 69 341 385 142 59 44 37 29 24
21 23 21 24 75 351 382 136 59 43 36 29 24
22 23 21 24 83 350 373 131 59 42 36 28 24
23 23 21 25 89 354 362 128 58 41 36 28 27
24 23 21 25 92 371 357 124 57 41 36 28 25
25 23 21 25 95 376 350 120 54 40 36 28 25
26 22 21 26 102 382 351 116 53 40 35 27 24
27 22 21 26 105 388 342 111 51 40 35 27 24
28 22 21 26 106 397 326 109 49 39 35 27 24
29 22 22 26 108 407 311 107 48 39 35 26 24
30 22   27 113 413 302 102 47 40 35 26 24
31 22   28   415   98 47   37   24