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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 08151500 Llano Rv at Llano, TX


Llano County, Texas
Hydrologic Unit Code 12090204
Latitude  30°45'04", Longitude  98°40'10" NAD27
Drainage area 4,197  square miles
Contributing drainage area 4,192  square miles
Gage datum 970.01 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 1938-10-01 -> 2024-09-30)

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
1 442 256 249 233 334 500 353 159 299 230 284 197
2 241 298 277 217 445 584 231 210 255 192 261 192
3 230 353 251 213 859 411 260 773 217 185 448 192
4 221 833 273 217 418 613 369 185 178 700 1,270 191
5 229 419 236 221 325 738 324 144 236 825 422 198
6 224 347 314 277 324 530 449 139 205 264 548 203
7 219 270 352 256 301 430 240 145 190 271 366 199
8 225 243 274 251 276 288 196 134 1,050 373 353 215
9 213 293 277 240 392 483 167 121 484 522 292 218
10 207 244 423 273 450 351 155 128 914 483 260 217
11 204 225 552 337 620 317 214 183 826 283 245 298
12 199 233 536 257 597 392 621 278 223 269 234 214
13 204 233 391 227 535 354 229 326 191 974 219 199
14 198 227 311 204 475 280 174 213 178 1,580 208 199
15 201 218 267 329 456 267 164 196 174 1,140 319 253
16 203 263 325 738 542 403 179 508 207 2,380 598 220
17 240 251 268 360 541 506 240 360 245 622 739 207
18 331 286 383 317 568 831 190 234 623 417 410 203
19 344 252 309 333 693 642 185 183 304 553 351 219
20 474 729 320 293 484 384 242 178 242 614 270 625
21 512 353 321 359 396 231 170 150 223 319 247 595
22 283 348 320 325 363 590 140 140 394 249 224 320
23 233 494 262 481 277 1,150 140 238 484 241 226 262
24 220 454 236 529 399 407 141 326 726 579 243 219
25 207 434 229 636 551 960 164 248 530 390 278 204
26 217 392 265 367 655 559 174 206 296 409 235 219
27 232 312 335 464 641 818 169 195 460 356 222 227
28 212 272 320 445 642 350 138 195 273 757 222 212
29 305 239 271 396 523 397 127 658 218 794 216 208
30 236   245 354 447 388 118 571 255 411 206 267
31 224   261   451   132 425   361   782