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USGS Surface-Water 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 970.08 feet above NAVD88
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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
1 438 254 247 233 334 500 353 159 299 230 284 197
2 240 295 275 217 445 584 231 210 255 192 261 192
3 229 350 249 213 859 411 260 773 217 185 448 192
4 220 824 271 217 418 613 369 185 178 700 1,270 191
5 228 415 234 221 325 738 324 144 236 825 422 198
6 223 344 311 277 324 530 449 139 205 264 548 203
7 218 268 352 256 301 430 240 145 190 271 366 199
8 224 241 274 251 276 288 196 134 1,050 373 353 215
9 211 290 277 240 392 483 167 121 484 522 292 218
10 206 243 423 273 450 351 155 128 914 483 260 217
11 203 226 552 337 620 317 214 183 826 283 245 296
12 198 234 536 257 597 392 621 278 223 269 234 213
13 202 233 391 227 535 354 229 326 191 974 219 198
14 197 227 311 204 475 280 174 213 178 1,580 208 198
15 200 217 267 329 456 267 164 196 174 1,140 319 252
16 202 262 325 738 542 403 179 508 207 2,380 598 219
17 238 250 268 360 541 506 240 360 245 622 739 206
18 328 284 383 317 568 831 190 234 623 417 410 202
19 341 250 309 333 693 642 185 183 304 553 351 218
20 469 721 320 293 484 384 242 178 242 614 270 619
21 507 350 321 359 396 231 170 150 223 319 247 589
22 281 345 320 325 363 590 140 140 394 249 224 317
23 232 489 262 481 277 1,150 140 238 484 241 226 260
24 219 450 236 529 399 407 141 326 726 579 243 218
25 206 430 229 636 551 960 164 248 530 390 278 203
26 216 388 265 367 655 559 174 206 296 409 235 218
27 230 309 335 464 641 818 169 195 460 356 222 226
28 211 270 320 445 642 350 138 195 273 757 222 212
29 302 231 271 396 523 397 127 658 218 794 216 208
30 235   245 354 447 388 118 571 255 411 206 265
31 222   261   451   132 425   361   774