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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 -> 2021-09-30)

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
1 466 187 202 191 209 417 231 244 209 188 280 206
2 243 216 195 188 388 343 243 313 365 167 257 203
3 222 247 193 191 670 314 244 782 204 157 956 202
4 213 378 202 191 346 556 226 200 200 250 1,890 201
5 206 313 209 190 304 352 306 159 186 496 376 200
6 201 256 221 201 249 260 250 189 171 313 399 200
7 198 226 269 220 216 292 184 187 164 247 295 199
8 194 214 228 224 249 244 160 165 1,520 829 275 201
9 195 207 222 212 302 302 154 139 517 664 258 202
10 193 201 212 226 357 265 149 138 197 447 244 199
11 189 200 230 223 775 267 198 139 173 228 229 199
12 188 198 246 200 369 416 759 432 172 281 219 197
13 187 195 244 193 255 280 188 330 180 2,000 215 196
14 186 191 222 186 300 256 155 288 164 1,310 211 196
15 187 191 209 389 297 221 146 216 164 366 606 198
16 188 211 233 767 359 273 236 180 178 3,040 739 197
17 188 195 212 406 262 648 232 334 305 596 1,210 192
18 188 198 207 373 296 398 176 268 707 310 394 190
19 186 197 204 338 247 229 164 177 265 527 295 190
20 184 188 255 256 237 197 160 154 212 580 264 229
21 181 191 284 290 319 183 147 159 261 321 248 301
22 180 194 263 243 291 205 158 147 515 253 238 260
23 178 217 224 243 223 177 149 166 305 302 235 236
24 177 226 207 216 334 182 182 374 208 935 227 221
25 177 310 198 200 548 196 201 255 200 390 229 209
26 185 238 206 188 698 172 296 215 224 279 231 212
27 193 213 362 224 413 242 185 185 332 284 227 210
28 192 204 279 247 321 209 169 303 223 252 219 202
29 217 228 228 220 365 218 150 869 191 343 213 198
30 201   214 201 351 338 141 865 336 401 209 197
31 193   201   303   206 406   306   1,350