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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 -> 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 30 28 26 26 113 745 459 80 46 47 53 37
2 28 25 25 35 144 733 450 80 45 47 38 36
3 28 28 25 35 161 823 346 73 44 42 40 36
4 27 26 26 33 169 923 402 71 43 35 40 35
5 26 24 26 31 164 960 325 75 43 35 40 35
6 26 24 26 31 185 994 313 73 42 46 40 35
7 26 24 26 30 211 1,080 313 69 42 42 40 35
8 26 26 27 30 260 1,140 303 68 42 42 39 35
9 26 27 27 32 250 1,080 279 75 42 42 39 35
10 27 24 27 34 258 1,060 211 78 42 40 39 35
11 33 24 27 35 222 1,070 202 72 41 44 43 35
12 35 24 28 43 247 1,050 183 64 41 42 43 35
13 28 27 26 34 247 1,070 189 64 43 39 37 35
14 28 24 24 32 257 1,030 160 62 41 45 37 35
15 28 27 24 35 289 876 156 56 89 37 48 35
16 27 25 25 43 298 842 134 49 58 41 40 34
17 28 25 25 39 316 791 121 48 41 39 41 34
18 28 25 25 35 397 765 137 46 41 49 40 35
19 26 25 24 38 429 814 117 52 40 59 38 34
20 25 25 24 44 438 804 109 45 44 60 37 34
21 25 27 24 58 469 802 94 51 45 59 38 34
22 24 26 24 77 509 701 72 53 46 55 42 34
23 24 24 24 71 530 586 94 50 46 55 55 34
24 24 24 24 68 495 527 84 52 45 54 60 34
25 24 24 24 70 506 510 85 50 42 54 62 34
26 27 25 24 76 536 473 86 47 38 54 63 34
27 26 26 24 98 508 449 82 47 40 54 61 34
28 24 27 24 111 576 459 79 46 42 54 55 35
29 24 35 24 102 644 503 76 48 41 54 47 34
30 24   24 102 674 504 76 48 41 53 37 34
31 25   24   719   79 46   42   33