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USGS Surface-Water Daily Statistics for Texas

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Explore Real-time Water Data Using New Products from USGS TXWSC

View over 750 USGS real-time stream, lake, reservoir, precipitation, and groundwater stations in context with current weather and hazard conditions on both desktop and mobile devices.

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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 -> 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
1 451 260 253 237 341 510 365 165 273 204 286 200
2 245 303 282 221 455 598 239 217 254 178 263 195
3 234 359 255 217 884 415 269 802 214 183 458 195
4 225 851 278 221 429 622 381 192 178 721 1,310 195
5 233 426 240 225 334 756 335 148 236 852 431 201
6 228 353 319 283 333 539 463 144 207 270 562 206
7 223 274 359 261 309 438 245 149 194 277 374 203
8 228 246 279 256 284 292 200 139 1,080 383 361 219
9 216 298 282 244 404 495 171 124 500 538 298 222
10 210 248 432 278 460 360 159 132 945 498 265 222
11 207 228 564 344 638 325 220 189 855 291 250 303
12 202 237 547 262 616 403 642 288 229 277 238 217
13 207 236 399 231 551 364 236 338 196 1,010 222 202
14 201 231 317 208 490 288 180 220 182 1,630 211 202
15 204 221 272 336 469 274 169 202 179 1,180 326 257
16 206 268 331 755 557 415 185 527 213 2,460 616 224
17 244 256 273 368 555 522 248 373 252 643 762 210
18 337 292 391 323 585 860 197 242 645 430 421 206
19 350 256 315 340 716 665 191 189 314 571 360 223
20 483 745 326 299 497 397 250 184 249 634 276 638
21 523 359 327 367 398 237 176 155 230 329 253 608
22 288 355 326 333 370 607 145 144 406 257 229 325
23 237 504 267 492 282 1,190 145 246 500 248 231 266
24 224 464 240 541 409 420 146 334 751 598 248 223
25 210 443 234 649 567 994 169 254 548 402 282 207
26 220 400 270 374 674 578 180 211 305 285 233 222
27 235 318 342 474 661 847 175 200 474 256 222 231
28 216 277 326 455 663 362 142 201 278 758 223 216
29 310 239 276 404 538 410 131 681 221 809 218 212
30 240   250 361 461 402 122 591 257 415 208 272
31 227   266   463   136 437   365   799