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USGS Daily Statistics for Puerto Rico

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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 50059050 RIO GRANDE DE LOIZA BLW LOIZA DAMSITE, PR


Trujillo Alto Municipio, Puerto Rico
Hydrologic Unit Code 21010005
Latitude  18°20'32.17", Longitude  66°00'21.51" NAD27
Drainage area 209  square miles
Gage datum 49.2 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 1986-10-01 -> 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
1 171 33 31 53 223 194 253 310 205 216 623 307
2 87 37 31 60 253 428 449 197 167 250 387 537
3 95 73 18 9.3 124 316 273 1,020 473 492 263 319
4 85 51 40 35 187 393 168 324 307 336 258 280
5 442 105 66 22 270 174 215 190 880 327 476 218
6 329 272 54 84 203 199 250 170 542 316 522 609
7 199 129 143 38 214 172 197 128 453 556 1,000 780
8 135 53 74 270 255 128 275 133 557 322 1,230 1,240
9 118 72 63 60 220 79 251 145 260 235 653 403
10 128 37 109 35 215 213 533 158 3,070 771 878 281
11 129 55 15 166 127 100 433 210 414 710 707 488
12 93 43 24 85 181 197 154 93 266 507 1,230 420
13 116 66 46 112 451 135 229 110 596 442 1,400 143
14 229 47 10 183 243 122 338 520 203 1,160 806 150
15 316 26 21 77 131 185 242 253 1,190 407 534 153
16 137 35 36 102 112 210 229 396 762 782 718 241
17 120 111 9 588 572 257 231 210 609 312 1,020 178
18 88 55 47 290 625 94 319 194 2,050 417 715 145
19 99 20 13 137 281 450 491 270 1,530 241 361 116
20 199 37 65 194 910 310 510 267 2,260 317 283 204
21 104 38 39 211 499 456 523 302 1,490 556 364 113
22 68 38 121 220 266 515 451 1,220 3,080 935 419 151
23 96 67 139 195 609 196 325 2,500 788 552 347 161
24 37 22 77 223 309 349 178 1,480 433 313 746 133
25 117 40 63 81 250 128 147 645 325 484 279 595
26 62 52 55 105 243 160 119 371 217 850 281 148
27 47 51 103 107 198 274 96 253 287 874 1,520 145
28 67 27 79 93 212 92 187 228 254 941 434 93
29 59 102 99 313 146 87 151 229 204 602 261 309
30 70   150 122 369 142 797 290 284 434 263 132
31 56   96   188   272 310   380   173