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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 -> 2019-09-30)

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
1 473 189 204 187 209 422 234 248 213 193 285 208
2 245 218 197 184 392 347 246 319 372 171 261 205
3 225 249 195 185 680 316 247 797 207 161 974 204
4 215 384 203 179 350 565 229 202 203 258 1,930 203
5 208 317 208 179 306 356 310 162 188 514 382 202
6 203 259 220 188 250 263 254 192 173 324 405 202
7 200 228 270 212 217 296 186 190 166 251 299 201
8 196 216 229 218 251 247 161 167 1,550 845 277 203
9 197 209 223 208 305 306 155 140 526 677 260 204
10 194 203 214 222 361 268 150 140 199 456 246 201
11 191 202 232 219 788 271 201 141 174 231 231 201
12 190 197 249 193 373 423 773 440 175 285 221 199
13 189 194 247 185 257 284 190 336 183 2,050 218 197
14 188 192 224 181 303 259 157 293 167 1,340 213 198
15 189 191 211 389 299 224 148 219 167 373 616 200
16 189 213 235 776 360 277 240 183 182 3,100 753 198
17 189 196 212 408 262 659 235 340 315 607 1,240 194
18 188 199 207 374 297 404 179 273 735 315 400 191
19 187 198 202 338 248 232 166 180 273 537 299 192
20 184 189 229 254 238 200 162 157 218 591 267 232
21 182 192 218 290 322 185 149 162 269 326 251 306
22 181 195 206 241 295 208 160 150 534 256 241 264
23 179 219 196 242 225 178 151 169 315 306 237 239
24 178 228 191 215 339 183 183 381 214 953 230 223
25 178 314 187 199 557 197 204 259 206 396 232 212
26 186 241 197 187 710 173 300 219 231 283 233 214
27 195 215 358 223 418 245 187 187 343 289 230 212
28 193 206 274 247 323 211 171 308 230 256 222 203
29 219 239 224 219 368 220 152 886 196 349 215 200
30 202   210 201 354 343 143 882 348 408 211 199
31 194   197   305   209 414   310   1,380