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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 -> 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 54 53 39 30 68 521 69 11 32 25 187 31
2 74 50 38 37 56 563 63 9 30 24 103 29
3 176 55 36 35 60 498 60 5.6 29 24 75 36
4 125 64 36 38 400 424 57 20 21 24 86 43
5 95 56 39 47 142 411 53 17 18 21 78 45
6 80 51 38 42 97 363 49 4.3 17 20 71 47
7 75 47 37 44 87 315 47 3.7 16 18 70 54
8 70 42 36 38 279 284 46 3.1 13 17 70 80
9 64 44 37 32 469 256 45 3.3 73 17 70 65
10 61 41 48 27 188 233 43 2.7 68 16 67 60
11 59 40 48 32 154 209 43 2.4 30 16 65 57
12 59 38 49 94 184 190 53 2.4 19 15 60 56
13 58 37 49 46 207 173 47 2.2 8.4 17 56 63
14 55 38 50 40 208 193 38 2.5 4.6 523 48 72
15 53 40 47 35 166 174 36 9.2 3.9 90 44 63
16 62 38 46 31 217 137 34 57 3.4 64 41 58
17 73 37 46 31 506 121 33 47 11 70 41 56
18 85 35 45 63 455 111 31 38 16 58 37 54
19 89 35 48 59 505 114 28 26 6 51 35 57
20 80 92 46 56 394 110 31 23 3.6 50 30 51
21 73 81 45 45 236 104 21 36 3.1 47 25 49
22 84 56 44 67 230 127 21 33 25 41 23 47
23 78 53 42 50 209 109 20 30 39 38 23 46
24 75 50 44 44 6,050 94 19 25 27 38 22 47
25 76 43 42 62 820 94 18 23 22 45 22 46
26 73 42 39 68 1,370 87 21 28 130 69 22 45
27 65 41 36 67 490 85 29 82 81 47 23 104
28 61 39 69 66 458 90 24 70 40 40 23 107
29 59 5.4 69 61 580 104 16 46 31 34 35 68
30 55   53 63 429 79 15 40 27 4,860 36 60
31 53   45   454   13 36   457   58