CONNECTICUT RIVER BASIN 01186000 WEST BRANCH FARMINGTON RIVER AT RIVERTON, CT LOCATION.--Lat 4157'46", long 7301'05", Litchfield County, Hydrologic Unit 01080207, on right bank at downstream side of bridge on State Highway 20 at Riverton, 0.3 mi upstream from Still River, 2.0 mi downstream from Goodwin Dam of West Branch Reservoir, and at mile 55. DRAINAGE AREA.--131 mi2. PERIOD OF RECORD.--Discharge: August 1955 to current year. Water-quality records: Water Years 1954, 1955, 1975-80. REVISED RECORDS.--WSP 1501: 1956. WSP 1551: 1957. WSP 1701: 1958-59. GAGE.--Water-stage recorder. Datum of gage is 485.60 ft above sea level. Prior to Mar. 29, 1957, nonrecording gage at same site and datum. REMARKS.--Records good except for periods of estimated record which are poor. Flow regulated by Otis and West Branch Reservoirs and Colebrook River Lake. Telephone gage-height telemeter at this station. EXTREMES OUTSIDE PERIOD OF RECORD.--Flood of Aug. 19, 1955, reached a stage of 21.1 ft, from floodmarks, discharge, 57,200 ft3/s, by slope-area measurement 1.5 mi upstream. 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 1 391 441 477 846 393 149 343 184 217 335 239 147 2 398 439 708 699 389 155 416 385 271 338 177 147 3 399 435 507 610 389 165 465 453 302 344 143 145 4 396 431 590 614 388 171 396 458 302 342 146 143 5 396 427 580 616 412 172 231 671 303 304 155 143 6 396 426 572 576 409 199 369 819 303 286 145 144 7 406 426 624 427 398 182 936 813 237 257 143 144 8 327 427 528 453 392 174 1390 550 268 240 142 118 9 407 281 609 448 203 170 941 430 309 245 145 61 10 461 333 649 399 128 209 513 440 314 253 144 89 11 440 461 647 415 168 235 443 431 312 242 143 143 12 428 415 671 439 168 232 448 419 313 185 144 150 13 425 420 687 425 168 229 476 424 313 155 146 144 14 426 447 686 416 168 232 356 e365 312 233 145 142 15 425 444 690 416 168 248 322 e330 307 273 141 140 16 424 444 677 440 166 235 397 e305 234 274 141 140 17 424 442 685 431 163 227 685 e345 195 314 142 138 18 424 442 722 419 162 227 489 e315 224 282 145 117 19 254 391 719 296 168 227 221 e285 253 237 144 103 20 432 444 654 429 176 229 459 e400 248 212 143 101 21 181 442 660 305 174 231 448 e370 218 267 149 100 22 227 441 653 233 206 232 441 e340 202 303 149 100 23 259 441 540 235 188 228 436 e320 224 297 147 86 24 332 426 450 288 161 197 434 e305 277 293 145 58 25 452 430 496 435 149 178 432 e295 315 296 145 59 26 447 466 686 421 148 225 430 e285 313 296 144 69 27 443 467 762 394 154 207 334 e280 311 289 144 78 28 446 452 846 399 155 200 181 e275 334 263 150 79 29 444 447 850 391 --- 202 174 e270 335 240 147 83 30 395 446 845 392 --- 205 166 270 327 239 146 83 31 414 --- 849 393 --- 239 --- 232 --- 239 146 --- TOTAL 12119 12874 20319 13700 6511 6411 13772 12064 8393 8373 4625 3394 MEAN 391 429 655 442 233 207 459 389 280 270 149 113 MAX 461 467 850 846 412 248 1390 819 335 344 239 150 MIN 181 281 450 233 128 149 166 184 195 155 141 58 STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1956 - 1997, BY WATER YEAR (WY) MEAN 190 253 259 222 217 268 466 304 273 213 225 165 MAX 1080 794 655 597 729 668 1134 673 903 720 509 490 (WY) 1956 1956 1997 1978 1976 1968 1958 1983 1984 1972 1969 1973 MIN 34.2 52.1 89.0 41.7 57.4 106 122 94.3 35.6 15.8 12.3 25.0 (WY) 1969 1965 1965 1981 1977 1989 1985 1985 1957 1957 1957 1967 e Estimated. SUMMARY STATISTICS FOR 1996 CALENDAR YEAR FOR 1997 WATER YEAR WATER YEARS 1956 - 1997 ANNUAL TOTAL 148523 122555 ANNUAL MEAN 406 336 254 HIGHEST ANNUAL MEAN 384 1956 LOWEST ANNUAL MEAN 102 1965 HIGHEST DAILY MEAN 1290 Apr 23 1390 Apr 8 7310 Oct 16 1955 LOWEST DAILY MEAN 46 Sep 4 58 Sep 24 2.7 Oct 5 1960 ANNUAL SEVEN-DAY MINIMUM 131 Jan 3 73 Sep 24 3.8 Oct 1 1960 INSTANTANEOUS PEAK FLOW 1430 Apr 8 10600 Oct 16 1955 INSTANTANEOUS PEAK STAGE 6.41 Apr 8 12.47 Oct 16 1955 INSTANTANEOUS LOW FLOW 56 Jan 19 .90 Jul 21 1960 10 PERCENT EXCEEDS 673 578 469 50 PERCENT EXCEEDS 395 309 200 90 PERCENT EXCEEDS 194 144 64