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USGS Daily Statistics for the Nation

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 08172000 San Marcos Rv at Luling, TX


Caldwell County, Texas
Hydrologic Unit Code 12100203
Latitude  29°39'58", Longitude  97°39'02" NAD27
Drainage area 838  square miles
Contributing drainage area 838  square miles
Gage datum 322.21 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 1983-10-01 -> 2025-09-30)

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
1 381 361 378 395 347 778 663 271 243 208 732 348
2 373 371 374 352 351 605 635 268 237 206 436 351
3 453 422 395 351 330 800 788 270 224 220 391 365
4 392 665 600 360 444 1,030 759 264 229 232 551 464
5 369 687 596 479 415 702 658 256 225 212 612 385
6 359 499 476 472 418 516 815 249 243 230 429 343
7 347 443 424 396 330 879 513 245 296 216 387 325
8 346 429 399 487 317 703 447 244 260 211 342 446
9 360 401 383 377 425 676 390 239 329 405 338 363
10 387 409 392 352 438 905 367 236 304 248 318 363
11 361 402 382 349 418 790 349 233 255 241 302 342
12 346 461 773 448 354 724 353 229 271 245 295 366
13 356 379 642 360 342 659 331 226 256 309 298 344
14 381 358 490 385 399 580 314 221 231 562 325 325
15 374 355 404 362 403 530 332 219 239 464 354 366
16 404 351 416 340 401 475 329 221 236 292 764 450
17 394 346 481 347 448 422 352 235 290 382 625 361
18 557 385 414 451 615 461 404 276 236 2,390 825 341
19 430 350 386 371 472 437 342 235 238 725 476 357
20 368 426 448 343 570 388 341 222 249 598 428 409
21 351 526 421 351 406 398 638 239 245 388 420 714
22 354 490 398 336 482 563 599 225 224 393 1,100 1,190
23 369 431 380 312 466 940 389 234 227 450 1,050 983
24 353 481 353 414 1,030 539 394 230 224 590 615 579
25 701 525 340 388 794 446 430 227 228 583 558 449
26 463 526 334 353 749 424 392 248 219 450 476 439
27 529 439 400 338 571 404 331 582 257 390 460 450
28 445 402 431 325 471 384 315 420 226 350 428 471
29 390 354 517 304 559 403 307 249 301 323 376 445
30 387   385 302 662 530 315 232 227 363 359 400
31 370   473   824   289 273   1,350   402