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USGS Surface-Water Daily Statistics for Pennsylvania

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[!] Over the next year, the USGS Pennsylvania Water Science Center will be updating the geodetic vertical elevation (gage datum) for many locations. Click HERE for additional information including a current list of streamgages with upcoming datum changes. This update in gage datum does not affect the location of the streamgage, nor the observed local gage height or discharge recorded at the streamgage.


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 01573000 Swatara Creek at Harper Tavern, PA


Lebanon County, Pennsylvania
Hydrologic Unit Code 02050305
Latitude  40°24'09", Longitude  76°34'39" NAD27
Drainage area 337  square miles
Gage datum 356.68 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 1918-10-01 -> 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
1 680 596 900 1,030 779 555 395 277 355 458 497 781
2 749 643 919 1,090 651 556 377 306 462 341 468 791
3 712 701 880 1,110 667 524 390 280 325 371 537 693
4 702 752 934 1,040 699 491 321 367 248 312 435 720
5 650 668 1,160 1,030 721 484 346 297 239 293 418 840
6 690 580 1,180 1,090 697 564 336 260 309 302 399 846
7 655 709 1,100 1,100 701 489 326 272 424 261 407 831
8 674 711 999 943 663 456 394 256 735 272 431 767
9 723 575 988 943 676 398 328 253 429 324 561 723
10 744 545 995 920 660 381 344 250 271 371 460 680
11 633 636 1,140 860 653 433 296 266 253 296 412 779
12 584 701 1,220 857 751 439 296 334 228 275 440 801
13 582 675 1,120 879 713 490 307 431 296 258 561 791
14 589 745 1,090 873 662 446 325 398 268 281 462 846
15 609 751 1,150 940 678 371 315 260 264 309 470 737
16 580 702 1,010 1,060 715 353 315 230 233 287 530 714
17 562 698 1,000 1,120 782 331 341 298 257 316 642 736
18 547 678 989 876 648 399 310 284 374 321 547 751
19 608 720 962 775 698 420 315 337 415 425 514 655
20 772 733 1,040 770 727 443 309 215 316 441 541 599
21 765 765 1,090 720 673 490 306 242 243 405 554 794
22 757 797 1,260 714 731 728 318 273 259 331 593 726
23 660 849 1,160 697 725 765 471 264 296 398 632 670
24 807 1,000 1,120 660 609 458 527 391 281 420 517 698
25 980 1,060 1,060 706 599 376 472 306 306 399 600 793
26 909 1,100 1,000 673 662 488 366 236 400 418 633 725
27 879 943 1,070 682 593 469 301 193 436 433 573 685
28 796 954 1,080 747 555 649 248 258 438 478 710 646
29 664 769 1,050 710 661 560 274 227 354 482 818 647
30 635   932 685 640 452 301 185 413 480 723 709
31 657   986   604   241 232   445   686