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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 03047000 Loyalhanna Creek at Loyalhanna Dam, PA


Westmoreland County, Pennsylvania
Hydrologic Unit Code 05010008
Latitude  40°27'32", Longitude  79°26'58" NAD83
Drainage area 290  square miles
Gage datum 870.18 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 1939-10-01 -> 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
1 653 697 920 831 615 528 387 200 184 176 280 513
2 678 685 948 879 602 507 367 196 184 177 287 498
3 721 696 1,020 933 606 458 333 200 181 198 276 456
4 754 745 947 953 612 491 331 197 188 212 283 446
5 806 827 862 964 636 567 311 229 188 233 283 437
6 868 891 883 987 631 439 293 232 189 240 277 474
7 797 850 1,030 975 670 376 289 233 182 241 284 506
8 708 866 1,130 971 648 340 256 224 177 231 277 503
9 645 844 1,170 976 683 352 223 212 182 198 252 533
10 550 769 1,190 982 724 349 230 210 188 179 257 554
11 509 732 1,170 951 706 337 253 200 214 175 273 578
12 540 742 1,130 930 697 379 278 184 213 180 276 587
13 567 756 1,120 853 722 341 288 184 206 189 293 583
14 585 757 1,050 799 726 333 297 195 209 192 287 601
15 599 716 1,000 727 726 397 289 191 223 197 278 583
16 610 739 1,010 699 729 427 261 199 222 195 275 555
17 639 834 1,010 799 710 439 238 183 202 188 277 545
18 633 884 943 899 692 454 225 177 232 228 308 528
19 567 864 909 914 676 447 214 183 244 226 349 537
20 562 859 899 936 678 419 195 179 232 215 369 563
21 583 848 837 818 617 375 181 153 227 244 360 559
22 565 855 879 702 588 363 182 141 215 238 362 526
23 536 856 935 621 574 373 212 143 202 218 346 553
24 581 854 946 624 523 392 237 152 186 220 345 622
25 629 855 925 657 501 405 232 156 169 217 359 673
26 617 846 961 679 482 386 211 155 182 188 398 711
27 640 885 941 680 486 356 185 153 199 180 404 703
28 689 930 918 681 457 374 166 152 216 204 397 696
29 682 820 869 713 499 390 163 189 197 223 425 693
30 705   848 668 539 387 168 204 184 227 478 661
31 702   886   560   194 198   243   667