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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 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 -> 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
1 253 240 360 447 319 207 126 93 103 136 160 345
2 287 259 378 467 268 214 122 96 138 132 162 356
3 283 323 348 502 260 204 117 89 79 164 214 263
4 277 330 367 459 264 183 106 101 102 118 177 307
5 264 276 459 441 258 176 102 92 85 114 164 317
6 279 241 420 451 301 189 95 91 113 109 154 312
7 289 286 389 425 331 173 105 80 208 94 160 309
8 292 266 357 388 296 157 109 77 265 95 158 313
9 316 223 360 380 294 143 107 65 105 180 237 306
10 335 224 383 392 272 137 120 70 107 168 191 269
11 271 284 499 378 275 176 103 77 96 109 174 326
12 247 265 486 359 320 153 101 94 83 103 183 328
13 234 273 407 361 320 151 91 99 106 98 214 330
14 244 289 402 364 306 147 111 101 79 127 189 353
15 247 278 473 379 286 129 118 76 78 112 199 301
16 247 283 411 423 320 130 114 67 86 102 216 273
17 221 288 389 487 344 123 123 60 110 118 252 287
18 227 277 409 380 291 145 109 84 221 122 221 293
19 331 284 387 327 286 154 107 121 152 165 205 260
20 313 306 420 341 275 160 101 75 100 165 225 246
21 278 319 432 351 283 169 91 68 83 169 233 347
22 266 356 505 327 271 573 135 69 87 136 241 292
23 249 347 473 299 323 319 155 77 139 148 241 261
24 346 417 466 275 288 193 227 149 123 167 199 302
25 453 429 466 289 253 143 231 94 157 130 252 352
26 395 419 431 278 262 143 192 85 250 143 266 292
27 362 366 463 283 264 159 114 87 211 144 228 280
28 320 380 429 295 249 223 97 83 199 164 289 257
29 263 345 440 273 262 206 109 74 191 172 323 248
30 246   397 265 250 138 106 61 146 192 314 288
31 261   439   234   91 66   162   270