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USGS 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 01576500 Conestoga River at Lancaster, PA


Lancaster County, Pennsylvania
Hydrologic Unit Code 02050306
Latitude  40°03'00", Longitude  76°16'39" NAD27
Drainage area 324  square miles
Gage datum 245.63 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 1928-10-01 -> 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
1 450 454 659 700 597 400 298 276 274 313 274 394
2 530 480 667 747 499 465 274 278 352 272 246 394
3 501 571 623 761 507 413 305 271 274 295 307 356
4 512 596 662 718 520 390 293 398 235 225 261 377
5 466 519 734 715 487 370 267 301 203 218 243 428
6 482 479 706 709 558 378 292 237 248 211 248 436
7 465 601 714 706 520 364 337 259 276 197 250 455
8 455 544 627 669 489 361 360 240 456 233 263 414
9 495 454 641 664 479 326 293 250 397 324 346 394
10 519 454 651 682 465 322 322 254 235 259 261 403
11 441 483 720 628 456 355 312 263 263 268 261 485
12 439 507 734 621 460 387 311 224 269 256 282 491
13 434 502 709 652 486 411 359 344 248 213 302 507
14 442 582 721 618 490 370 342 284 207 194 282 519
15 463 537 770 630 428 314 384 218 232 217 290 448
16 422 544 660 771 463 320 306 198 262 226 288 455
17 384 546 630 714 503 365 284 242 318 237 350 490
18 423 539 642 586 435 315 308 277 259 246 316 517
19 463 537 634 558 492 366 286 316 283 300 279 428
20 538 547 676 572 463 332 263 229 210 288 306 395
21 507 541 700 524 438 365 352 224 192 256 305 493
22 481 558 864 538 412 621 321 364 220 220 333 442
23 435 582 783 520 501 826 331 293 259 248 355 418
24 511 651 758 504 440 347 398 376 253 242 292 421
25 631 734 692 547 390 298 259 230 280 218 389 482
26 686 753 665 534 422 329 276 219 264 236 366 426
27 634 704 736 565 389 383 354 197 270 261 345 447
28 583 678 728 552 386 426 394 270 284 289 386 435
29 491 587 733 538 415 386 340 231 251 285 430 418
30 472   657 519 427 328 306 197 337 366 412 456
31 517   677   390   253 189   281   430