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USGS Daily Statistics for Massachusetts

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ICE EFFECTS ON STREAMFLOW

The formation of ice on rivers can cause discharge values to appear unusually high. Display of these erroneous discharge data may result in improper assessment of flow conditions and misuse of the data. For this reason, display of discharge values for streams significantly affected by ice may be disabled from view. Display of discharge data will resume when ice conditions are no longer present. Discharge values for streams minimally affected by ice will continue to be displayed. Flows for streams with these conditions appear to increase during the night and decrease to near-base-line conditions around midday. To estimate the correct discharge for these streams, use the flow rate that corresponds to the bottom of the discharge curve, rather than the peak that corresponds to the top of the curve. Note that this method of estimation is possible only when no surface runoff is occurring. Daily mean discharges for periods of both significant and minimal ice-effect will be estimated and published in the Annual Water-Data Report for the water year in which they occurred.


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 01118500 PAWCATUCK RIVER AT WESTERLY, RI


Southeastern Connecticut Planning Region County, Connecticut
Hydrologic Unit Code 011000070303
Latitude  41°23'07", Longitude  71°49'59" NAD27
Drainage area 294.0  square miles
Contributing drainage area 294.0  square miles
Gage datum 5.0 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 1940-10-01 -> 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
1 762 762 918 1,150 850 610 350 220 216 244 359 591
2 779 747 927 1,190 842 618 365 214 228 242 355 588
3 775 771 962 1,200 822 623 350 203 230 242 369 594
4 772 798 959 1,200 814 608 336 202 226 239 381 601
5 768 816 961 1,200 799 606 331 205 213 232 378 604
6 752 803 958 1,180 784 635 325 206 204 236 378 614
7 752 803 991 1,150 766 625 314 211 211 236 376 632
8 751 821 997 1,110 748 619 308 224 215 236 376 654
9 750 796 996 1,080 740 596 301 233 209 229 392 653
10 775 760 1,000 1,050 756 568 295 255 201 232 401 669
11 766 746 992 1,020 758 554 290 261 207 227 409 675
12 753 750 982 990 753 545 287 269 221 222 422 715
13 757 758 1,010 977 753 542 284 273 211 221 435 723
14 761 778 1,070 987 740 559 294 258 206 223 451 713
15 764 785 1,100 985 730 545 292 254 211 261 453 731
16 760 799 1,100 1,000 732 514 289 259 214 285 447 727
17 751 820 1,090 1,020 736 490 293 239 215 300 467 726
18 734 820 1,110 1,010 735 483 279 238 208 295 468 738
19 730 824 1,090 987 728 487 267 243 208 286 451 745
20 737 826 1,070 966 711 486 254 247 212 296 441 712
21 745 812 1,060 935 702 465 250 235 218 318 457 696
22 748 809 1,110 913 683 440 247 230 232 309 476 710
23 739 817 1,140 901 664 424 247 221 229 296 499 713
24 774 835 1,140 894 670 409 261 206 225 294 515 726
25 824 870 1,120 898 679 411 267 199 224 295 532 736
26 871 908 1,080 889 686 408 258 196 230 300 556 746
27 883 911 1,060 894 682 387 246 195 241 308 571 760
28 874 914 1,040 890 666 369 240 194 246 323 572 742
29 862 887 1,030 878 646 353 234 195 247 343 584 734
30 827   1,110 852 622 343 235 199 247 359 592 750
31 795   1,140   613   227 226   362   758