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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 -> 2023-09-30)

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
1 442 256 249 233 334 500 353 159 303 231 282 198
2 241 298 277 217 445 584 231 210 258 193 259 193
3 230 353 251 213 859 411 260 773 220 186 450 192
4 221 833 273 217 418 613 369 185 180 707 1,280 192
5 229 419 236 221 325 738 324 144 239 834 423 199
6 224 347 314 277 324 530 449 139 207 266 551 204
7 219 270 352 256 301 430 240 145 192 272 367 200
8 225 243 274 251 276 288 196 134 1,060 376 354 216
9 213 293 277 240 392 483 167 121 490 527 293 219
10 207 244 423 273 450 351 155 128 925 488 260 219
11 204 225 552 337 620 317 214 183 836 285 246 298
12 199 233 536 257 597 392 621 278 225 271 234 214
13 204 233 391 227 535 354 229 326 193 985 219 199
14 198 227 311 204 475 280 174 213 180 1,590 208 199
15 201 218 267 329 456 267 164 196 176 1,160 320 253
16 203 263 325 738 542 403 179 508 210 2,410 603 220
17 240 251 268 360 541 506 240 360 248 629 746 207
18 331 286 383 317 568 831 190 234 631 421 412 203
19 344 252 309 333 693 642 185 183 308 559 353 219
20 474 729 320 293 484 384 242 178 245 621 271 625
21 512 353 321 359 396 231 170 150 226 322 249 595
22 283 348 320 325 363 590 140 140 398 252 225 320
23 233 494 262 481 277 1,150 140 241 490 243 227 262
24 220 454 236 529 399 407 141 330 734 585 245 219
25 207 434 229 636 551 960 164 251 536 393 280 204
26 217 392 265 367 655 559 174 208 299 279 236 219
27 232 312 335 464 641 818 169 197 464 252 223 227
28 212 272 320 445 642 350 138 198 273 742 223 212
29 305 239 271 396 523 397 127 666 217 791 217 208
30 236   245 354 447 388 118 578 256 407 207 267
31 224   261   451   132 430   358   782