CONNECTICUT RIVER BASIN
01135300 SLEEPERS RIVER (SITE W-5) NEAR ST. JOHNSBURY, VT
LOCATION.--Lat 44°26'04", long 72°02'22", Caledonia County, Hydrologic Unit 01080102, on left bank, just upstream of
Emerson Falls, 1.5 mi northwest of Post Office in St. Johnsbury, and 2.6 mi above mouth.
DRAINAGE AREA.--42.9 mi².
PERIOD OF RECORD.--Discharge Records: October 1990 to current year.
Water-quality records: Water year 1992 to 1995.
GAGE.--Water-stage recorder. Datum of gage is 641.68 ft above sea level.
REMARKS.--Records good except those for estimated daily discharges, which are fair.
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 350 ft³/s and maximum (*):
Discharge Gage height Discharge Gage height
Date Time (ft³/s) (ft) Date Time (ft³/s) (ft)
Oct. 21 1800 1,100 3.42 Apr. 28 1300 364 2.11
Nov. 9 1330 1,010 3.17 May 2 0015 369 2.12
Dec. 2 0930 1,600 3.81 May 7 0030 568 2.52
Dec. 25 0145 400 2.19 July 15 0800 * 3,020 * 4.91
Apr. 6 1830 508 2.41 Aug. 13 1515 726 2.78
Apr. 7 1645 843 2.95 Aug. 22 0045 1,320 3.53
Apr. 19 1915 447 2.29 Aug. 28 0045 524 2.44
Minimum discharge, 7.3 ft³/s, August 11.
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 20 45 110 40 e34 70 146 189 83 11 12 69
2 16 41 773 e72 e34 119 114 237 69 10 12 49
3 18 39 177 e60 e33 166 122 157 49 41 15 42
4 18 36 115 58 e32 80 137 173 42 49 13 36
5 15 38 96 68 33 68 184 126 38 24 12 31
6 14 39 87 130 33 67 348 170 34 17 11 28
7 13 39 80 72 33 57 516 305 32 19 9.6 27
8 12 49 85 53 e32 53 280 155 29 18 8.6 26
9 46 417 e80 48 e31 e54 168 139 27 69 9.3 24
10 65 178 74 51 e30 e56 164 193 24 44 8.5 22
11 58 100 71 50 e30 55 155 145 22 21 11 22
12 29 78 68 e50 29 50 139 128 22 15 24 47
13 25 66 70 e49 e28 48 160 119 29 14 237 37
14 22 52 71 e49 e27 e49 159 99 24 22 137 40
15 19 41 75 e48 e27 e48 160 97 20 956 37 28
16 17 38 76 47 e26 e46 200 114 17 131 43 24
17 16 50 87 44 e25 e44 248 193 26 66 69 21
18 15 55 128 e42 e27 e43 284 127 52 68 36 23
19 15 60 117 e40 33 42 331 112 122 47 23 21
20 16 60 86 e38 e80 42 284 103 43 42 19 25
21 586 53 64 e37 e72 43 279 87 34 32 121 34
22 215 48 64 36 135 44 259 106 97 28 402 25
23 120 45 70 42 e200 41 259 89 49 24 103 24
24 82 39 133 e42 e88 44 227 76 29 22 58 29
25 62 39 214 e40 57 42 207 72 26 20 42 23
26 50 43 e86 e38 59 64 212 67 25 18 40 21
27 45 40 e80 e36 69 78 194 61 21 16 69 21
28 45 36 76 e35 109 75 280 55 17 18 212 19
29 42 44 87 e34 --- 152 240 50 15 22 68 61
30 48 44 93 e34 --- 235 177 49 13 16 57 67
31 64 --- 49 e33 --- 186 --- 60 --- 13 47 ---
TOTAL 1828 1952 3542 1516 1446 2261 6633 3853 1130 1913 1966.0 966
MEAN 59.0 65.1 114 48.9 51.6 72.9 221 124 37.7 61.7 63.4 32.2
MAX 586 417 773 130 200 235 516 305 122 956 402 69
MIN 12 36 49 33 25 41 114 49 13 10 8.5 19
CFSM 1.37 1.52 2.66 1.14 1.20 1.70 5.15 2.90 .88 1.44 1.48 .75
IN. 1.58 1.69 3.07 1.31 1.25 1.96 5.75 3.34 .98 1.66 1.70 .84
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1991 - 1997, BY WATER YEAR (WY)
MEAN 60.1 72.5 68.9 58.6 42.3 80.2 214 98.2 38.5 34.1 32.7 24.6
MAX 128 124 143 108 93.3 107 302 175 61.5 66.2 63.4 32.2
(WY) 1991 1991 1991 1996 1996 1991 1994 1996 1996 1996 1997 1997
MIN 20.0 31.6 36.4 24.5 19.8 39.1 75.2 52.8 14.9 8.47 16.1 12.4
(WY) 1995 1995 1993 1994 1993 1994 1995 1995 1995 1991 1993 1995
SUMMARY STATISTICS FOR 1996 CALENDAR YEAR FOR 1997 WATER YEAR WATER YEARS 1991 - 1997
ANNUAL TOTAL 34147.3 29006.0
ANNUAL MEAN 93.3 79.5 68.7
HIGHEST ANNUAL MEAN 93.2 1996
LOWEST ANNUAL MEAN 42.8 1995
HIGHEST DAILY MEAN 773 Dec 2 956 Jul 15 956 Jul 15 1997
LOWEST DAILY MEAN 6.1 Sep 24 8.5 Aug 10 2.3 Aug 3 1991
ANNUAL SEVEN-DAY MINIMUM 8.1 Sep 18 10 Aug 5 3.4 Jul 28 1991
INSTANTANEOUS PEAK FLOW a 3020 Jul 15 a 3020 Jul 15 1997
INSTANTANEOUS PEAK STAGE 4.91 Jul 15 b 5.20 Jan 19 1996
INSTANTANEOUS LOW FLOW 7.3 Aug 11 2.0 Aug 3 1991
ANNUAL RUNOFF (CFSM) 2.17 1.85 1.60
ANNUAL RUNOFF (INCHES) 29.60 25.14 21.75
10 PERCENT EXCEEDS 212 177 150
50 PERCENT EXCEEDS 58 48 39
90 PERCENT EXCEEDS 15 18 12
a From rating curve extended above 560 ft³/s on basis of theoretical weir formula.
b Ice jam.
e Estimated.
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