HOUSATONIC RIVER BASIN 01208500 NAUGATUCK RIVER AT BEACON FALLS, CT LOCATION.--Lat 41×26'32", long 73×03'47", 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.--No estimated daily discharges. Records good. 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 1998 TO SEPTEMBER 1999 DAILY MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 239 168 291 183 562 2060 672 239 247 119 61 73 2 140 179 258 141 1190 1440 671 234 234 186 58 66 3 117 157 244 879 2300 928 628 232 215 171 59 64 4 104 146 234 917 1810 2530 608 296 198 124 57 62 5 106 140 224 456 1420 1750 565 276 179 112 61 62 6 104 139 225 308 1030 1170 521 245 176 105 72 79 7 103 138 222 288 864 960 515 260 182 99 68 119 8 930 138 215 233 806 701 466 259 s169 101 76 101 9 908 137 239 600 704 688 430 290 153 99 72 93 10 945 137 216 756 676 661 428 282 143 94 60 656 11 695 342 205 449 652 613 397 253 141 84 60 238 12 375 317 193 354 649 588 430 231 147 82 61 128 13 289 237 189 326 771 528 395 205 145 90 67 108 14 1180 210 193 268 672 536 361 198 156 88 113 123 15 1420 203 180 761 547 643 332 177 143 83 101 156 16 828 192 189 1070 537 609 349 180 138 82 91 3980 17 441 195 188 713 502 646 471 179 145 80 77 3560 18 358 208 188 982 1040 808 394 190 124 79 73 2540 19 302 189 173 1800 1290 771 344 331 116 93 70 2210 20 243 185 172 1580 978 641 364 1400 122 101 71 1920 21 226 194 174 1260 719 577 351 978 118 93 99 1390 22 233 185 196 1130 562 3360 318 449 110 84 80 566 23 218 175 228 1040 464 3210 398 442 96 78 72 408 24 204 174 199 2580 462 2830 466 1060 98 101 76 318 25 186 165 168 1850 451 2160 370 1250 104 81 85 235 26 182 572 159 1680 450 1260 323 799 106 69 133 214 27 185 949 153 1510 455 954 298 689 101 67 94 205 28 212 496 167 1190 641 964 276 571 102 62 77 185 29 237 375 184 844 --- 1010 262 383 147 60 74 174 30 194 316 328 692 --- 844 259 319 151 60 71 625 31 176 --- 185 602 --- 723 --- 275 --- 59 87 --- TOTAL 12080 7358 6379 27442 23204 37163 12662 13172 4406 2886 2376 20658 MEAN 390 245 206 885 829 1199 422 425 147 93.1 76.6 689 MAX 1420 949 328 2580 2300 3360 672 1400 247 186 133 3980 MIN 103 137 153 141 450 528 259 177 96 59 57 62 STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1955 - 1999, BY WATER YEAR (WY) MEAN 395 546 637 647 657 999 1019 622 414 253 289 244 MAX 2480 1890 1688 2307 1436 2227 2467 2098 1973 787 2920 902 (WY) 1956 1956 1997 1979 1981 1983 1983 1989 1982 1972 1955 1975 MIN 80.3 85.6 164 118 252 450 273 239 122 72.6 72.0 78.4 (WY) 1965 1965 1966 1981 1980 1989 1985 1965 1957 1966 1966 1964 HOUSATONIC RIVER BASIN 01208500 NAUGATUCK RIVER AT BEACON FALLS, CT—Continued SUMMARY STATISTICS FOR 1998 CALENDAR YEAR FOR 1999 WATER YEAR WATER YEARS 1955 - 1999 ANNUAL TOTAL 196528 169786 ANNUAL MEAN 538 465 560 HIGHEST ANNUAL MEAN 830 1973 LOWEST ANNUAL MEAN 237 1965 HIGHEST DAILY MEAN 3450 Mar 9 3980 Sep 16 56400 Aug 19 1955 LOWEST DAILY MEAN 71 Sep 21 57 Aug 4 c40 Oct 5 1930 ANNUAL SEVEN-DAY MINIMUM 75 Sep 15 59 Jul 29 47 Jul 11 1971 INSTANTANEOUS PEAK FLOW 12700 Sep 16 a106000 Aug 19 1955 INSTANTANEOUS PEAK STAGE 11.95 Sep 16 b25.70 Aug 19 1955 INSTANTANEOUS LOW FLOW d50 Aug 3 24 Oct 21 1935 10 PERCENT EXCEEDS 1140 1050 1200 50 PERCENT EXCEEDS 342 234 346 90 PERCENT EXCEEDS 108 80 112 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. d Also occurred Aug. 4, 10, and Sep. 5.