HOUSATONIC RIVER BASIN 01208500 NAUGATUCK RIVER AT BEACON FALLS, CT LOCATION.--Lat 4126'32", long 7303'47", New Haven County, Hydrologic Unit 01100005, on left bank at downstream side of bridge on Bridge Street at Beacon Falls, 0.4 mi upstream from Bronson Brook, and at mile 10.1. DRAINAGE AREA.--260 mi2. WATER-DISCHARGE RECORDS PERIOD OF RECORD.--June 1918 to September 1924, September 1928 to September 1955, published as "near Naugatuck," October 1955 to current year. REVISED RECORDS.--WSP 1171: 1918-24, 1928-49. WSP 1501: 1956 (P). WDR CT-83-1: Drainage area. GAGE.--Water-stage recorder. Datum of gage is 117.28 ft above sea level. Prior to Oct. 1, 1955, water-stage recorder at site 2.5 mi upstream at datum 37.89 ft higher. Oct. 1, 1955, to Mar. 21, 1957, nonrecording gage at present site and datum. REMARKS.--No estimated daily discharges. Records good. Telephone and satellite gage-height telemeter at this station. Flow regulated by Lake Winchester, Hall Meadow Brook, East Branch, Thomaston, Pitch, Morris, and Wigwam Reservoirs, Northfield Brook, Hancock Brook, Hop Brook, and Black Rock Lakes, and during low flow, by industrial plants upstream. Flow increased by diversion from Shepaug Reservoir into Naugatuck River basin. Town of Watertown diverts about 0.5 Mgal/d from Pomperaug River basin into Naugatuck River about 10 mi upstream. EXTREMES OUTSIDE PERIOD OF RECORD.--Flood in November 1927 reached a stage of 14 ft, former site and datum, discharge, about 26,000 ft3/s. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1996 TO SEPTEMBER 1997 DAILY MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 418 738 934 745 693 502 2020 636 315 135 129 210 2 379 734 3410 733 653 573 1690 689 336 159 106 205 3 382 685 2420 692 634 607 1580 1020 335 309 131 189 4 329 611 2650 717 619 581 1630 1750 282 224 149 174 5 257 537 2520 728 1660 553 1710 1250 242 185 251 162 6 223 497 2010 735 1520 938 1530 921 210 171 211 143 7 217 487 1690 646 904 772 1360 1100 202 202 139 137 8 419 868 1730 565 721 607 1120 826 192 175 119 130 9 1400 2270 1460 543 634 549 895 731 181 565 110 124 10 1390 1920 1260 542 574 617 761 786 171 1080 106 114 11 891 2530 1170 518 542 678 689 717 162 373 103 175 12 594 2190 1480 425 517 600 764 637 153 253 106 448 13 521 1440 1990 414 497 517 1470 605 225 206 189 216 14 482 870 2010 408 565 589 1130 584 204 185 317 155 15 405 783 2170 387 675 1470 799 564 154 231 180 133 16 363 735 1910 992 624 959 706 525 143 432 213 123 17 346 701 2310 925 546 678 696 473 136 281 150 115 18 331 668 2590 510 518 626 1060 467 206 220 628 128 19 1680 660 2160 430 583 570 1290 561 400 172 285 112 20 5440 679 1960 428 741 575 1100 935 220 146 188 101 21 2820 608 1510 423 621 580 972 658 167 128 574 97 22 4210 594 1200 432 700 659 858 556 149 314 478 94 23 4230 552 1110 507 789 601 737 465 141 217 363 96 24 3390 479 1130 462 626 495 672 412 136 193 252 93 25 2390 479 1590 1800 533 458 686 468 133 218 204 92 26 1270 1840 1190 1250 531 789 578 501 149 157 182 96 27 949 1660 1000 807 622 889 507 404 268 132 159 92 28 953 1070 949 1540 542 668 852 371 182 129 275 91 29 900 800 958 1280 --- 693 891 344 149 128 319 186 30 760 667 986 721 --- 745 650 328 138 128 281 173 31 824 --- 870 648 --- 1600 --- 324 --- 132 235 --- TOTAL 39163 29352 52327 21953 19384 21738 31403 20608 6081 7580 7132 4404 MEAN 1263 978 1688 708 692 701 1047 665 203 245 230 147 MAX 5440 2530 3410 1800 1660 1600 2020 1750 400 1080 628 448 MIN 217 479 870 387 497 458 507 324 133 128 103 91 STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1919 - 1997, BY WATER YEAR (WY) MEAN 315 469 581 607 587 1001 975 607 390 241 245 232 MAX 2480 1890 1688 2307 1436 2227 2467 2098 1973 957 2920 1301 (WY) 1956 1956 1997 1979 1981 1983 1983 1989 1982 1938 1955 1938 MIN 55.3 63.9 113 118 204 450 273 225 122 72.6 72.0 68.2 (WY) 1931 1932 1936 1981 1934 1989 1985 1941 1957 1966 1966 1931 SUMMARY STATISTICS FOR 1996 CALENDAR YEAR FOR 1997 WATER YEAR WATER YEARS 1919 - 1997 ANNUAL TOTAL 310374 261125 ANNUAL MEAN 848 715 520 HIGHEST ANNUAL MEAN 830 1973 LOWEST ANNUAL MEAN 237 1965 HIGHEST DAILY MEAN 5440 Oct 20 5440 Oct 20 56400 Aug 19 1955 LOWEST DAILY MEAN 87 Sep 5 91 Sep 28 c40 Oct 5 1930 ANNUAL SEVEN-DAY MINIMUM 92 Aug 31 93 Sep 22 47 Jul 11 1971 INSTANTANEOUS PEAK FLOW 9060 Oct 20 a106000 Aug 19 1955 INSTANTANEOUS PEAK STAGE 10.22 Oct 20 b25.70 Aug 19 1955 INSTANTANEOUS LOW FLOW 81 Sep 28 24 Oct 21 1935 10 PERCENT EXCEEDS 2010 1590 1120 50 PERCENT EXCEEDS 611 565 318 90 PERCENT EXCEEDS 163 138 105 a From rating curve extended above 9,000 ft3/s, on basis of slope-area measurements of peak flow at gage height of 12.4 and 25.7 ft, use and datum then in use. b From floodmarks. c Also occurred on Oct. 12, 1930 and Sept. 7, 1936.