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USGS 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 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 322.05 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 1983-10-01 -> 2020-09-30)

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
1 414 395 417 439 339 866 751 297 262 219 812 378
2 406 407 414 389 332 670 719 294 255 217 475 381
3 497 452 437 388 354 901 898 293 240 235 425 397
4 426 721 675 387 491 1,160 864 288 244 248 605 509
5 401 764 672 529 460 782 732 278 238 225 671 420
6 391 551 532 523 465 567 922 270 261 246 462 372
7 377 489 472 435 363 994 575 265 322 231 417 352
8 376 474 443 544 348 792 499 265 281 225 367 489
9 398 441 425 416 474 762 432 260 360 445 364 395
10 429 451 434 387 486 1,030 405 256 323 268 341 395
11 397 443 423 385 461 896 384 250 273 260 322 366
12 380 511 880 501 388 816 389 247 293 263 315 398
13 393 416 727 399 354 730 364 244 276 336 319 373
14 423 393 549 428 428 647 344 239 248 304 349 352
15 414 390 449 401 436 589 366 237 257 282 383 398
16 449 385 463 376 434 501 363 239 253 274 848 494
17 438 379 539 384 491 462 390 256 315 390 689 393
18 628 425 460 505 675 512 451 303 254 2,680 920 370
19 480 384 428 412 505 485 377 256 256 792 523 387
20 408 473 500 379 635 428 375 241 269 652 468 446
21 388 590 468 375 448 440 720 261 264 415 459 793
22 391 547 427 364 538 631 677 244 241 423 1,230 1,330
23 388 479 416 340 517 1,070 433 255 244 490 1,170 1,100
24 371 538 387 455 1,140 605 437 250 241 650 680 640
25 748 589 374 429 863 498 479 246 245 643 616 492
26 500 590 367 390 796 470 436 267 235 490 522 481
27 584 488 443 373 607 438 365 648 279 411 503 494
28 490 446 479 358 510 423 347 463 243 372 468 517
29 427 398 580 332 566 446 337 269 325 345 409 488
30 426   427 328 723 595 347 249 239 393 389 437
31 406   530   920   317 295   1,520   438