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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 01555500 East Mahantango Creek near Dalmatia, PA


Northumberland County, Pennsylvania
Hydrologic Unit Code 02050301
Latitude  40°36'40", Longitude  76°54'44" NAD27
Drainage area 162  square miles
Gage datum 400.47 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 1929-10-01 -> 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
1 252 238 357 444 317 206 126 93 103 135 159 342
2 285 257 375 464 267 212 121 95 137 131 161 353
3 281 320 345 498 259 203 116 92 78 163 212 261
4 275 327 364 456 262 182 106 108 101 117 176 304
5 262 273 456 438 257 175 101 94 84 113 162 314
6 277 240 430 448 299 189 95 91 112 108 152 309
7 287 284 394 422 329 172 104 83 206 93 159 306
8 289 264 360 385 295 156 109 78 262 95 156 310
9 314 222 361 378 293 142 106 74 104 179 235 303
10 332 223 383 389 272 137 120 81 106 166 189 267
11 269 282 497 375 276 174 103 82 95 108 173 324
12 245 263 484 356 320 152 100 97 83 102 182 332
13 232 271 405 359 320 150 91 100 105 97 212 330
14 242 287 400 361 306 146 111 102 78 126 187 352
15 245 276 470 376 289 129 117 77 77 111 197 299
16 245 282 409 420 322 130 113 68 85 101 214 272
17 220 288 392 487 345 123 122 60 109 117 250 286
18 226 277 410 381 291 144 108 84 219 121 219 291
19 328 284 387 327 286 153 106 121 151 164 203 259
20 310 305 419 341 275 159 100 76 99 164 222 245
21 276 317 431 351 282 168 91 69 82 168 231 345
22 264 354 503 327 270 567 134 69 88 135 239 290
23 247 345 471 299 322 316 154 77 138 147 239 259
24 343 414 463 274 287 191 225 148 122 165 198 300
25 448 425 463 289 252 142 229 93 156 129 250 349
26 392 416 429 277 261 142 191 85 248 141 264 290
27 359 364 460 282 263 158 114 87 209 143 226 278
28 317 378 426 294 248 222 97 82 198 162 286 255
29 261 345 437 272 260 205 109 74 189 171 321 247
30 244   394 263 249 137 105 61 144 190 311 287
31 259   436   233   92 65   160   268