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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 09015000 COLORADO RIVER BL SHADOW MOUNTAIN RESERVOIR, CO.


Grand County, Colorado
Hydrologic Unit Code 14010001
Latitude  40°12'18.70", Longitude 105°50'15.22" NAD83
Drainage area 190  square miles
Gage datum 8,326.47 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 1947-10-01 -> 2024-09-30)

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 30 28 25 27 117 759 466 82 47 47 53 36
2 28 25 25 36 150 747 468 82 45 48 38 36
3 28 28 26 36 168 831 360 75 44 42 39 36
4 27 26 26 33 176 923 419 73 43 34 40 35
5 26 24 26 32 171 958 338 77 43 35 40 35
6 26 24 26 32 193 976 326 75 42 46 40 35
7 26 24 27 31 220 1,070 326 71 42 42 39 35
8 26 26 27 31 271 1,120 315 69 42 42 39 34
9 26 27 27 32 261 1,060 290 76 42 42 39 34
10 27 24 27 34 269 1,030 219 80 42 40 39 34
11 33 24 28 36 231 1,050 209 73 41 44 43 34
12 35 24 28 44 257 1,040 189 65 41 42 43 34
13 28 27 26 34 258 1,060 195 65 44 39 36 34
14 28 24 24 33 268 1,030 165 63 41 45 37 34
15 28 24 24 36 302 882 161 57 91 37 48 34
16 27 24 25 44 311 851 138 50 59 38 40 34
17 28 24 25 40 330 804 124 48 42 39 41 34
18 28 25 25 36 398 785 141 46 41 50 40 35
19 26 25 24 39 431 850 120 52 41 60 38 34
20 25 25 24 45 443 831 112 46 44 61 37 34
21 25 25 24 60 470 824 96 52 46 60 38 34
22 24 25 24 80 528 721 73 53 46 56 42 34
23 24 25 24 73 553 607 96 50 46 56 55 34
24 24 25 24 70 517 546 86 53 45 54 61 34
25 24 25 24 73 529 528 87 50 42 54 63 34
26 27 25 24 78 560 490 88 47 38 55 64 34
27 26 25 24 90 531 459 83 48 40 55 62 34
28 24 25 24 114 602 464 80 46 42 55 55 35
29 24 24 24 106 667 512 77 48 42 55 47 34
30 24   24 106 684 516 78 48 42 54 37 34
31 25   24   729   80 46   42   33