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USGS Daily Statistics for Texas

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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 08171350 Blanco Rv at San Marcos, TX


Hays County, Texas
Hydrologic Unit Code 12100203
Latitude  29°52'46.24", Longitude  97°54'38.71" NAD83
Drainage area 436.0  square miles
Gage datum 542.97 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 2014-10-01 -> 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 60 58 42 37 83 575 76 12 36 28 208 35
2 83 56 41 45 68 624 70 10 33 27 115 32
3 195 61 40 43 74 553 66 6.2 32 26 83 40
4 139 70 39 47 489 471 63 22 24 26 95 47
5 106 62 43 58 172 456 59 18 20 23 86 50
6 89 56 42 51 119 404 55 4.7 19 22 79 52
7 83 52 41 53 106 350 52 4.1 17 20 78 59
8 78 46 44 46 341 316 51 3.5 15 19 78 88
9 71 49 45 39 572 284 50 3.1 81 19 78 72
10 68 45 58 33 229 259 48 2.8 76 18 75 66
11 65 44 59 39 188 231 48 2.6 33 18 72 63
12 66 41 60 115 225 211 59 2.5 21 17 67 62
13 64 40 60 56 253 192 53 2.4 9.3 18 62 70
14 62 41 61 48 254 215 43 2.7 5.1 581 53 80
15 59 43 57 43 203 194 40 10 4.3 100 49 70
16 69 41 56 38 265 152 38 64 3.7 71 46 64
17 81 40 55 38 619 134 36 52 12 77 45 62
18 95 38 55 76 557 123 34 43 17 64 41 60
19 99 38 58 72 617 126 31 29 6.6 57 39 63
20 89 100 55 69 482 123 26 25 4 56 34 57
21 81 89 54 55 289 116 23 40 3.4 53 28 54
22 92 61 53 82 255 141 23 36 28 46 26 52
23 86 57 50 61 232 121 21 33 43 43 25 51
24 83 54 53 53 6,720 105 21 28 30 42 25 52
25 83 46 51 75 912 105 20 26 25 49 24 51
26 81 46 46 83 1,520 97 23 31 144 76 24 50
27 72 45 43 82 544 95 32 91 90 53 25 116
28 67 43 84 80 509 99 26 78 44 44 25 119
29 65 5.4 84 74 644 115 18 51 34 37 38 75
30 61   65 77 477 88 16 45 30 5,400 40 67
31 59   54   502   15 40   508   65