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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 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 42 33 75 521 69 11 32 25 187 31
2 74 50 41 41 61 563 63 9 30 24 103 29
3 176 61 40 39 67 498 60 5.6 29 24 75 36
4 125 70 39 42 440 424 57 20 21 24 86 43
5 95 62 43 52 156 411 53 17 18 21 78 45
6 80 56 42 46 107 363 49 4.3 17 20 71 47
7 75 52 41 48 95 315 47 3.7 16 18 70 54
8 70 46 40 42 307 284 46 3.1 13 17 70 80
9 64 49 41 35 515 256 45 3.3 73 17 70 65
10 61 45 53 30 206 233 43 2.7 68 16 67 60
11 59 44 53 35 169 209 43 2.4 30 16 65 57
12 59 41 54 104 203 190 53 2.4 19 15 60 56
13 58 40 54 50 228 173 47 2.2 8.4 17 56 63
14 55 41 55 44 229 193 38 2.5 4.6 523 48 72
15 53 43 51 38 183 174 36 9.2 3.9 90 44 63
16 62 41 50 34 239 137 34 57 3.4 64 41 58
17 73 40 51 34 557 121 33 47 11 70 41 56
18 85 38 50 69 501 111 31 38 16 58 37 54
19 89 38 53 65 555 114 28 26 6 51 35 57
20 80 100 50 62 434 110 31 23 3.6 50 30 51
21 73 89 49 50 260 104 21 36 3.1 47 25 49
22 84 61 48 74 230 127 21 33 25 41 23 47
23 78 57 46 55 209 109 20 30 39 38 23 46
24 75 54 48 48 6,050 94 19 25 27 38 22 47
25 76 46 46 68 820 94 18 23 22 45 22 46
26 73 46 42 75 1,370 87 21 28 130 69 22 45
27 65 45 40 74 490 85 29 82 81 47 23 104
28 61 43 76 72 458 90 24 70 40 40 23 107
29 59 5.4 76 67 580 104 16 46 31 34 35 68
30 55   58 69 429 79 15 40 27 4,860 36 60
31 53   49   454   13 36   457   58