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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 08150700 Llano Rv nr Mason, TX


Mason County, Texas
Hydrologic Unit Code 12090204
Latitude  30°39'38", Longitude  99°06'32" NAD27
Drainage area 3,247  square miles
Contributing drainage area 3,242  square miles
Gage datum 1,230.36 feet above NGVD29
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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 1967-10-01 -> 2020-09-30)

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
1 466 187 202 191 209 417 234 248 213 190 280 206
2 243 216 195 188 388 343 246 319 372 169 257 203
3 222 247 193 191 670 314 247 797 207 159 956 202
4 213 378 202 191 346 556 229 202 203 254 1,890 201
5 206 313 209 190 304 352 310 162 188 505 376 200
6 201 256 221 201 249 260 254 192 173 318 399 200
7 198 226 269 220 216 292 186 190 166 247 295 199
8 194 214 228 224 249 247 161 167 1,550 829 275 201
9 195 207 222 212 302 306 155 140 526 664 258 202
10 193 201 212 226 357 268 150 140 199 447 244 199
11 189 200 230 223 775 271 201 141 174 228 229 199
12 188 198 246 200 369 423 773 440 173 281 219 197
13 187 195 244 193 255 284 190 336 181 2,000 215 196
14 186 191 222 186 300 259 157 293 165 1,310 211 196
15 187 191 209 389 297 224 148 219 165 366 606 198
16 188 211 233 767 359 277 240 183 179 3,040 739 197
17 188 195 212 406 262 659 235 340 310 596 1,210 192
18 188 198 207 373 296 404 179 273 720 310 394 190
19 186 197 204 338 247 232 166 180 269 527 295 190
20 184 188 255 256 237 200 162 157 215 580 264 229
21 181 191 284 290 319 185 149 162 265 321 248 301
22 180 194 263 243 291 208 160 150 524 253 238 260
23 178 217 224 243 223 178 151 169 310 302 235 236
24 177 226 207 216 334 183 183 381 211 935 227 221
25 177 310 198 200 548 197 204 259 203 390 229 209
26 185 238 206 188 698 173 300 219 227 279 231 212
27 193 213 362 224 413 245 187 187 337 284 227 210
28 192 204 279 247 321 211 171 308 226 252 219 202
29 217 228 228 220 365 220 152 886 193 343 213 198
30 201   214 201 351 343 143 882 342 401 209 197
31 193   201   303   209 414   306   1,350