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 and crest-stage gage. 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. Telephone telemetry at station. Satellite telemetry at station. REMARKS.--Records good except for periods of estimated daily dischares, which are fair. 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. EXTREMES FOR CURRENT YEAR.--Maximum discharge, 5,690 ft3/s, July 15, gage height, 8.38 ft; minimum discharge, 91 ft3/s, July 13, 14, gage height, 1.42 ft. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1999 TO SEPTEMBER 2000 DAILY MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 478 274 438 309 284 1180 500 455 346 217 911 138 2 364 e320 378 308 256 1090 466 468 369 190 749 162 3 310 e1900 371 334 230 861 448 425 463 171 729 181 4 848 1170 380 419 241 670 607 391 346 200 650 168 5 1200 848 371 928 233 599 615 391 291 235 457 145 6 701 568 390 577 222 559 503 394 745 173 362 124 7 350 484 658 472 221 521 444 350 3180 146 488 116 8 214 431 541 419 205 527 413 326 2230 130 357 113 9 217 408 446 384 202 536 729 296 956 120 319 109 10 366 388 408 643 230 574 731 392 640 125 635 140 11 e480 348 481 1210 259 917 622 709 713 116 491 122 12 e385 332 413 804 278 2050 550 482 1380 110 1090 114 13 325 305 362 587 237 1620 476 681 1290 105 642 194 14 602 317 482 461 1080 1310 441 1180 1250 98 645 138 15 450 304 797 383 1200 802 421 704 861 985 530 347 16 415 280 712 e340 745 703 474 496 720 2500 483 230 17 390 260 573 e310 570 1380 496 415 580 1090 415 157 18 638 235 494 e280 448 1340 623 509 562 447 350 131 19 489 238 432 e260 456 911 537 1020 558 317 309 308 20 585 240 525 e245 415 788 461 1180 480 262 267 570 21 615 294 1400 e235 376 700 1050 1120 408 221 237 287 22 541 270 839 e228 366 640 2100 915 400 233 214 193 23 882 258 635 e220 411 590 1160 724 358 198 220 154 24 664 248 539 e215 559 548 1200 1220 295 172 257 145 25 e525 288 434 e212 1020 509 837 1220 263 157 222 135 26 e440 370 411 e208 1270 511 643 807 250 225 192 153 27 e640 1740 400 e205 1120 472 666 617 363 864 171 189 28 546 1050 364 e200 1540 958 615 515 377 1190 160 156 29 495 642 343 e198 1370 946 560 457 285 659 160 131 30 337 510 332 229 --- 679 505 415 247 1050 146 121 31 293 --- 326 306 --- 550 --- 385 --- 1390 142 --- TOTAL 15785 15320 15675 12129 16044 26041 19893 19659 21206 14096 13000 5371 MEAN 509 511 506 391 553 840 663 634 707 455 419 179 MAX 1200 1900 1400 1210 1540 2050 2100 1220 3180 2500 1090 570 MIN 214 235 326 198 202 472 413 296 247 98 142 109 STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1928 - 2000, BY WATER YEAR (WY) MEAN 322 481 580 620 616 997 959 604 400 245 252 241 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 e Estimated. HOUSATONIC RIVER BASIN 01208500 NAUGATUCK RIVER AT BEACON FALLS, CT--Continued SUMMARY STATISTICS FOR 1999 CALENDAR YEAR FOR 2000 WATER YEAR WATER YEARS 1928 - 2000 ANNUAL TOTAL 190749 194219 ANNUAL MEAN 523 531 526 HIGHEST ANNUAL MEAN 830 1973 LOWEST ANNUAL MEAN 237 1965 HIGHEST DAILY MEAN 3980 Sep 16 3180 Jun 7 56400 Aug 19 1955 LOWEST DAILY MEAN 57 Aug 4 98 Jul 14 c40 Oct 5 1930 ANNUAL SEVEN-DAY MINIMUM 59 Jul 29 115 Jul 8 47 Jul 11 1971 INSTANTANEOUS PEAK FLOW 5690 Jul 15 a106000 Aug 19 1955 INSTANTANEOUS PEAK STAGE 8.38 Jul 15 b25.70 Aug 19 1955 INSTANTANEOUS LOW FLOW 91 Jul 13 24 Oct 21 1935 10 PERCENT EXCEEDS 1150 1080 1120 50 PERCENT EXCEEDS 364 432 325 90 PERCENT EXCEEDS 80 172 106 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.