HOUSATONIC RIVER BASIN 01200500 HOUSATONIC RIVER AT GAYLORDSVILLE, CT LOCATION.--Lat 4139'11", long 7329'25", Litchfield County, Hydrologic Unit 01100005, on left bank 0.4 mi downstream from hydroelectric plant of Connecticut Light and Power Co., 0.5 mi upstream from bridge on U.S. Highway 7 at Gaylordsville, 1.5 mi downstream from Tenmile River, and at mile 50.6. DRAINAGE AREA.--996 mi2. PERIOD OF RECORD.--Discharge: October 1900 to December 1904 (fragmentary), January 1905 to December 1908 (gage heights only), January 1909 to December 1912 (fragmentary), January 1913 to October 1914 (gage heights only), November 1914 (fragmentary), July 1940 to current year. Water-quality records: Water years 1960, 1968. Daily water temperature: Water years 1960, 1968. Daily suspended-sediment discharge: Water years 1979-80. REVISED RECORDS.--WDR CT-83-1: Drainage area. GAGE.--Water-stage recorder. Datum of gage is 236.78 ft above sea level. October 1900 to November 1914, nonrecording gage on covered bridge 0.6 mi downstream at different datum. REMARKS.--No estimated daily discharges. Records good. Ordinary flow regulated by power plant upstream. High flow is regulated by flood-control reservoirs in 20.5 mi2 of the Blackberry River basin, but flood control does not affect monthly runoff appreciably. Telephone gage-height telemeter at site. EXTREMES OUTSIDE PERIOD OF RECORD.--Flood in May 1854 reached a stage of 21 ft 3 in, former site and datum; reported by observer in 1902. Flood of Sept. 22, 1938, reached a stage of 14.5 ft, from floodmarks, at present site, discharge, 37,000 ft3/s, by computation of peak flow over dam 2.5 mi upstream adjusted for flow from intervening area. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1997 TO SEPTEMBER 1998 DAILY MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 192 535 1450 1110 1390 2410 3330 1430 1480 4260 536 239 2 249 657 2050 1090 1360 2450 3830 1970 1750 3420 508 207 3 284 965 1920 1210 1290 2530 3640 2310 2240 2680 361 197 4 311 819 1660 1430 1290 2420 3270 2170 1850 2210 401 229 5 268 846 1490 1860 1340 2280 2820 1930 1400 1940 379 262 6 324 879 1390 2180 1350 2240 2510 2300 1150 1790 392 229 7 301 851 1300 2760 1210 2150 2310 2570 939 1490 323 272 8 267 625 1250 4780 1180 1970 2110 2460 857 1380 349 245 9 323 1140 1160 6030 1120 3240 2050 2360 781 1570 294 235 10 253 2150 1090 6710 1070 5370 2960 3320 691 1630 305 285 11 295 1980 1040 6670 1060 5170 3030 4440 682 1520 343 277 12 179 1750 1020 5790 1700 4520 2700 4710 717 1260 404 225 13 182 1330 1040 4630 3060 3580 2460 3930 1070 1090 380 224 14 282 1170 995 3680 3040 2970 2120 3180 2650 991 404 224 15 249 1070 877 2930 2370 2700 1910 2720 4340 730 373 214 16 225 1020 846 2820 1890 2540 1790 2200 6330 850 373 189 17 329 907 911 2580 1790 2450 1770 2040 7040 761 292 205 18 271 884 857 2320 1780 2330 1670 1850 6500 897 191 207 19 220 892 857 2220 2200 3100 1830 1750 5540 901 214 314 20 282 808 873 1940 2350 4030 2680 1630 4230 845 279 240 21 300 759 831 1930 2280 4150 2610 1410 3010 1020 255 202 22 287 879 648 1720 2140 3740 2520 1290 2350 1070 340 327 23 315 1130 838 1660 1900 3290 2330 1180 2070 889 248 283 24 325 1370 832 2150 2140 3020 2180 1090 1830 907 274 278 25 319 1250 906 2390 2410 2840 1760 1020 1560 821 248 247 26 401 1160 1160 2100 2440 2700 1900 945 1450 801 420 232 27 522 1070 1270 1820 2390 2680 1960 930 1310 653 271 418 28 573 1140 1240 1770 2240 2710 1770 850 1430 603 266 312 29 656 1170 1130 1630 --- 3040 1640 846 1340 526 288 340 30 423 1130 1410 1440 --- 3260 1450 903 2460 552 254 346 31 533 --- 1510 1490 --- 3330 --- 757 --- 544 241 --- TOTAL 9940 32336 35851 84840 51780 95210 70910 62491 71047 40601 10206 7704 MEAN 321 1078 1156 2737 1849 3071 2364 2016 2368 1310 329 257 MAX 656 2150 2050 6710 3060 5370 3830 4710 7040 4260 536 418 MIN 179 535 648 1090 1060 1970 1450 757 682 526 191 189 CFSM .32 1.08 1.16 2.75 1.86 3.08 2.37 2.02 2.38 1.31 .33 .26 IN. .37 1.21 1.34 3.17 1.93 3.56 2.65 2.33 2.65 1.52 .38 .29 STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1941 - 1998, BY WATER YEAR (WY) MEAN 940 1450 1780 1867 1888 3033 3539 2218 1423 875 734 621 MAX 4500 5024 4926 6599 4398 6529 6685 5079 4538 3323 4433 2297 (WY) 1956 1956 1997 1949 1976 1977 1993 1989 1984 1972 1955 1975 MIN 203 203 411 288 592 1037 972 810 389 236 213 153 (WY) 1965 1965 1965 1981 1980 1965 1985 1965 1964 1965 1964 1995 SUMMARY STATISTICS FOR 1997 CALENDAR YEAR FOR 1998 WATER YEAR WATER YEARS 1941 - 1998 ANNUAL TOTAL 544969 572916 ANNUAL MEAN 1493 1570 1695 HIGHEST ANNUAL MEAN 2557 1996 LOWEST ANNUAL MEAN 572 1965 HIGHEST DAILY MEAN 6730 Apr 5 7040 Jun 17 38800 Aug 19 1955 LOWEST DAILY MEAN 179 Oct 12 179 Oct 12 a60 Aug 31 1944 ANNUAL SEVEN-DAY MINIMUM 206 Sep 20 213 Sep 12 104 Aug 18 1981 INSTANTANEOUS PEAK FLOW 7270 Jun 17 51800 Aug 19 1955 INSTANTANEOUS PEAK STAGE 7.45 Jun 17 18.58 Aug 19 1955 INSTANTANEOUS LOW FLOW 54 Aug 18 b30 Oct 28 1914 ANNUAL RUNOFF (CFSM) 1.50 1.58 1.70 ANNUAL RUNOFF (INCHES) 20.35 21.40 23.13 10 PERCENT EXCEEDS 3230 3080 3690 50 PERCENT EXCEEDS 1140 1260 1150 90 PERCENT EXCEEDS 284 268 331 a Also occurred on Sept. 20, 1949. b Site and datum then in use.