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USGS Daily Statistics for the Nation

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 16704000 Wailuku River at Piihonua, HI


Hawaii County, Hawaii
Hydrologic Unit Code 20010000
Latitude  19°42'43.7", Longitude 155°09'02.7" NAD83
Drainage area 220  square miles
Contributing drainage area 148.6  square miles
Gage datum 1,090 feet above LMSL
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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 1927-10-01 -> 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
1 211 261 610 347 300 117 152 314 219 164 213 437
2 215 335 487 301 254 110 130 341 168 169 284 615
3 236 300 406 346 260 102 106 230 149 202 166 350
4 243 227 291 272 261 110 136 272 159 169 155 275
5 299 167 285 261 219 106 143 225 130 152 163 264
6 248 140 423 258 252 108 216 205 227 139 209 291
7 397 153 356 247 268 100 209 312 118 150 192 254
8 470 117 442 338 232 102 175 387 97 137 184 243
9 303 139 467 410 208 82 151 313 86 147 265 369
10 344 183 385 535 229 83 134 362 102 132 300 418
11 408 163 303 490 232 81 111 303 115 133 500 409
12 342 184 345 392 220 91 116 384 117 246 473 296
13 257 210 456 366 232 95 168 235 126 123 374 464
14 224 235 510 342 215 109 200 244 134 98 280 480
15 305 361 371 356 205 97 162 268 173 161 376 300
16 334 277 271 413 153 97 231 211 146 155 430 249
17 203 382 434 419 144 110 261 315 213 170 484 237
18 211 471 356 429 158 99 225 201 201 192 614 355
19 288 367 366 391 167 117 208 179 197 197 429 340
20 230 380 269 339 175 93 247 195 177 148 777 373
21 167 323 273 276 180 87 333 155 196 126 432 340
22 196 292 310 322 138 102 359 183 119 166 443 412
23 193 291 393 369 193 104 216 536 147 181 401 283
24 187 369 482 388 197 130 210 506 149 178 324 235
25 248 407 327 316 242 155 201 342 119 139 298 397
26 420 386 344 288 207 164 177 267 177 145 401 416
27 248 444 331 281 148 139 175 176 207 210 323 243
28 219 507 290 255 160 133 148 163 155 223 307 228
29 249 517 257 320 148 152 172 142 152 200 341 237
30 285   350 325 124 221 205 192 262 214 417 378
31 340   367   117   182 214   256   261