ST. LAWRENCE RIVER BASIN
04294000 MISSISQUOI RIVER AT SWANTON, VT
LOCATION.--Lat 44°55'00", long 73°07'44", Franklin County, Hydrologic Unit 02010007, on left bank, at old railroad
abutment, 0.3 mi upstream of dam and Depot Street (Route 78) bridge, 0.3 mi southwest of Post Office in Swanton,
1.1 mi west of Hwy 78 and Interstate 89 interchange, and 7.9 mi upstream of mouth.
DRAINAGE AREA.--850 mi².
PERIOD OF RECORD.--Discharge records: March 1990 to current year.
GAGE.--Water-stage recorder. Elevation of gage is 105 ft above sea level, from topographic map. July 6, 1989 to
February 28, 1990, nonrecording gage at same site and datum.
REMARKS.--Records good except those for estimated daily discharges, which are fair. Low flows regulated by
powerplants upstream.
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 12,000 ft³/s and maximum (*):
Discharge Gage height Discharge Gage height
Date Time (ft³/s) (ft) Date Time (ft³/s) (ft)
Nov. 9 2230 16,000 5.62 July 15 2000 * 28,800 * 8.05
Dec. 2 2000 26,400 7.64
Minimum daily discharge, 106 ft³/s, August 9.
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
1 605 1020 1880 1160 e470 e2300 7240 4690 1150 223 269 891
2 444 833 18600 861 e465 e5900 5220 6330 1080 213 244 766
3 357 667 18600 e1100 e455 9060 4210 5020 773 306 194 1000
4 540 815 10200 e1150 e450 6700 4100 4450 723 1260 514 1080
5 366 565 5290 e1450 e440 4500 4810 3930 512 1820 407 737
6 273 699 3220 e2600 e445 3110 7730 3070 518 1010 285 519
7 275 823 2430 e2050 e415 2370 10900 9700 379 540 189 453
8 277 1190 2130 e1650 e405 e1600 10500 6810 468 409 131 515
9 211 8700 1890 e1100 e405 e1250 7530 4680 377 602 106 444
10 314 11000 1730 e1000 e400 e1180 4230 4420 315 1150 185 415
11 686 6070 1580 e960 e400 e1100 3080 4360 329 762 200 350
12 638 3110 1310 e900 e395 e980 2570 3460 326 512 322 422
13 505 2140 1620 e880 e395 e830 3240 4250 290 335 675 357
14 396 1550 2150 e835 e380 e780 4350 3390 399 922 2220 493
15 380 1140 2530 e800 e375 e750 3310 2610 575 17100 2000 562
16 368 766 2290 e790 e370 e700 2850 2400 447 17300 845 467
17 325 916 2120 e740 e365 e680 3360 2200 378 8670 2100 356
18 279 782 2990 e720 e380 e670 4330 2100 319 2770 1660 296
19 260 1080 3490 e710 e460 e655 5260 2100 518 1500 881 299
20 727 1420 2780 e700 e825 e645 5260 1850 665 1060 604 437
21 1560 1380 e1700 e750 e3050 e640 4640 1690 436 891 587 1120
22 5720 1200 e1490 e810 6680 e630 4430 2010 1090 616 2680 1040
23 5880 988 e1650 e1020 8190 e620 4250 3570 1780 478 4280 601
24 3890 884 2280 e1460 6430 e610 4180 2820 1070 411 2990 977
25 2850 1010 5540 e1200 e2900 e600 3800 2140 554 367 2070 815
26 1860 681 3550 e1010 e2150 e640 3340 1970 521 368 1140 667
27 1240 745 2580 e900 e2300 e860 3310 1910 419 337 704 449
28 923 724 2170 e750 e2700 e1400 3770 1370 394 281 990 569
29 1080 797 2440 e600 --- e2360 6320 1280 308 307 988 740
30 1010 810 4900 e525 --- e8030 5760 976 294 471 788 2160
31 801 --- 3590 e475 --- 8970 --- 1030 --- 302 759 ---
TOTAL 35040 54505 120720 31656 43095 71120 147880 102586 17407 63293 32007 19997
MEAN 1130 1817 3894 1021 1539 2294 4929 3309 580 2042 1032 667
MAX 5880 11000 18600 2600 8190 9060 10900 9700 1780 17300 4280 2160
MIN 211 565 1310 475 365 600 2570 976 290 213 106 296
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1990 - 1997, BY WATER YEAR (WY)
MEAN 1550 1962 1686 1465 910 2534 4866 2029 888 883 631 484
MAX 2507 3082 3894 3416 1670 5005 7078 3760 1353 2042 1130 758
(WY) 1991 1996 1997 1996 1996 1990 1993 1996 1993 1997 1990 1991
MIN 295 1024 596 429 317 801 1527 994 375 148 337 165
(WY) 1995 1992 1993 1994 1993 1994 1995 1992 1992 1991 1991 1995
SUMMARY STATISTICS FOR 1996 CALENDAR YEAR FOR 1997 WATER YEAR WATER YEARS 1990 - 1997
ANNUAL TOTAL 825060 739306
ANNUAL MEAN 2254 2025 1632
HIGHEST ANNUAL MEAN 2200 1996
LOWEST ANNUAL MEAN 1190 1995
HIGHEST DAILY MEAN 23800 Jan 20 a 18600 Dec 2 23800 Jan 20 1996
LOWEST DAILY MEAN 111 Sep 14 106 Aug 9 68 Sep 9 1995
ANNUAL SEVEN-DAY MINIMUM 119 Sep 13 203 Aug 6 85 Sep 4 1995
INSTANTANEOUS PEAK FLOW 28800 Jul 15 29000 Jan 20 1996
INSTANTANEOUS PEAK STAGE 8.05 Jul 15 9.50 Jan 20 1996
10 PERCENT EXCEEDS 5590 4850 4200
50 PERCENT EXCEEDS 1110 980 830
90 PERCENT EXCEEDS 229 354 219
a Also occurred December 3.
e Estimated.
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