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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 06020600 Ruby River below reservoir near Alder, MT


Madison County, Montana
Hydrologic Unit Code 10020003
Latitude  45°14'30.73", Longitude 112°06'40.46" NAD83
Drainage area 595  square miles
Gage datum 5,286.6 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 1962-10-01 -> 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 52 47 46 67 162 603 404 353 297 151 75 60
2 52 47 47 67 175 599 393 355 291 140 75 59
3 52 46 47 67 186 596 380 357 283 138 73 57
4 52 46 47 68 199 603 364 358 276 136 72 57
5 51 47 47 68 212 617 352 358 276 133 71 57
6 51 47 49 68 231 626 344 361 277 129 70 58
7 51 47 50 70 257 624 341 360 276 126 70 58
8 51 46 51 69 283 622 340 354 275 123 72 57
9 51 46 52 70 299 612 337 350 272 120 72 56
10 51 46 53 70 311 597 333 352 270 114 71 56
11 51 45 54 72 317 583 329 350 266 111 70 55
12 51 45 54 74 322 571 324 347 259 110 70 55
13 50 45 54 77 342 568 323 344 253 108 68 54
14 50 45 54 78 370 574 325 345 246 105 66 54
15 50 45 53 80 407 570 325 346 241 101 70 54
16 50 45 54 84 443 561 323 345 240 99 70 53
17 50 45 54 87 473 566 321 343 235 97 70 53
18 49 45 55 89 486 556 326 338 229 95 69 54
19 50 44 55 90 502 540 325 337 228 94 69 54
20 49 45 57 92 526 528 328 331 224 93 68 54
21 49 45 58 95 554 517 329 324 221 91 68 53
22 49 45 58 99 564 509 332 322 216 86 67 53
23 48 45 59 106 565 500 335 319 210 83 67 53
24 48 45 60 113 569 494 338 319 203 83 67 53
25 48 45 61 117 588 489 340 327 199 82 67 53
26 48 45 61 123 605 481 341 325 195 81 66 53
27 48 46 63 130 608 469 342 318 191 79 66 53
28 47 46 64 135 604 459 345 315 187 77 66 53
29 47 50 64 142 612 447 348 314 185 76 65 53
30 47   64 151 612 429 348 308 177 75 62 52
31 47   65   608   351 302   74   52