RESERVOIRS IN WINOOSKI RIVER BASIN ABOVE MONTPELIER, VT
04283500 EAST BARRE DETENTION RESERVOIR.--Lat 44°09'18", long 72°26'42", Washington County, Hydrologic Unit 0201003,
at dam on Jail Branch at East Barre, 4.5 mi upstream from mouth. DRAINAGE AREA, 38.8 mi². PERIOD OF RECORD,
February 1936 (in WSP 1307), March and April 1936 (in WSP 798), May 1936 to August 1938 (in WSP 1307),
September 1938 (in WSP 867), October 1938 to current year. GAGE, water-stage recorder. Datum of gage is above sea
level (levels by U.S. Army Corps of Engineers). Prior to August 30, 1960, nonrecording gage, and August 30 to
September 30, 1960, water-stage recorder, at present site at datum 1,127.9 ft above sea level.
Reservoir is formed by earthfill dam completed by U.S. Army Corps of Engineers in 1935 for flood control. Usable
capacity, 525 million ft3 between elevation 1,124.9 ft (bottom of outlet opening) and 1,165.0 ft (crest of
spillway). Dam has no gates; below elevation 1,165.0 ft, outflow from reservoir is dependent on capacity of outlet
opening near base of dam. Outlet-opening enlargement and reservoir-construction modifications completed in
November 1959. Size of opening since enlargement, height, 7 ft and average width, 3.7 ft. Figures given herein
represent usable contents, determined from capacity tables furnished by U.S. Army Corps of Engineers.
EXTREMES FOR PERIOD OF RECORD.--Maximum elevation, 1,163.9 ft, present datum, March 22, 1936; minimum not determined.
EXTREMES FOR CURRENT YEAR.--Maximum elevation, 1,143.44 ft October 21; minimum, not determined.
04285000 WRIGHTSVILLE DETENTION RESERVOIR.--Lat 44°18'38", long 72°34'31", Washington County, Hydrologic Unit
02010003, at dam on North Branch Winooski River at Wrightsville, 0.3 mi downstream from Long Meadow Brook, and
4.2 mi upstream from mouth. DRAINAGE AREA, 66.5 mi². PERIOD OF RECORD, November 1935 to February 1936 (in
WSP 1307), March to May 1936 (in WSP 798), June 1936 to August 1938 (in WSP 1307), September 1938 (in WSP 867),
October 1938 to current year. GAGE, water-stage recorder. Datum of gage is 612.75 ft above sea level (levels by
U.S. Army Corps of Engineers). Prior to July 28, 1960, nonrecording gage, and July 28 to September 30, 1960,
water-stage recorder, at present site at datum 612.75 ft above sea level.
Reservoir is formed by earthfill dam completed by U.S. Army Corps of Engineers in 1935 for flood control;
modification of intake-structure works to create a recreational pool completed in June 1965. Usable capacity for
recreation, 22 million ft3 between elevations 612.75 ft (bottom of outlet opening) and 620.00 ft; for flood
control, 851.5 million ft3 between elevations 620.00 ft and 685.00 ft (crest of spillway). Reservoir used for
storage of water for power September 1985 to current year. Usable capacity for storage of water power
774 million ft3 between elevation 631.00 ft, sill of gate and 685.00 ft, crest of spillway. Total usable capacity
873.5 million ft3. Figures given herein represent usable contents, determined from capacity tables furnished by
U.S. Army Corps of Engineers.
EXTREMES FOR PERIOD OF RECORD.--Maximum elevation, 676.4 ft, present datum, March 22, 1936, from graph based on gage
readings; minimum observed, 613.00 ft, August 17, 1949, and August 17-19, 1950.
EXTREMES FOR CURRENT YEAR.--Maximum elevation, 647.79 ft, December 2 and 3; minimum, 633.15 ft, October 8 and 9.
MONTHEND ELEVATION AND CONTENTS AT 2400, WATER YEAR OCTOBER 1996 TO SEPTEMBER 1997
Contents Change in contents
________________________________
Date Elevation (millions of Millions of Equivalent, cubic
(feet) cubic feet) cubic feet feet per second
_______________________________________________________________________
04283500 East Barre Detention Reservoir
_______________________________________________________________________
Sep. 30. . . . . . . . . . . . . . . . . . . 1134.19 11.7 -- --
Oct. 31. . . . . . . . . . . . . . . . . . . 1136.29 16.3 +4.6 +1.72
Nov. 30. . . . . . . . . . . . . . . . . . . 1135.95 15.4 -0.9 -0.35
Dec. 31. . . . . . . . . . . . . . . . . . . 1131.23 7.2 -8.2 -3.06
CAL YR 1996 . . . . . . . . . . . . . . -- -- -7.2 -0.23
Jan. 31. . . . . . . . . . . . . . . . . . . 1130.92 6.7 -0.5 -0.19
Feb. 28. . . . . . . . . . . . . . . . . . . 1134.27 11.8 +5.1 +2.11
Mar. 31. . . . . . . . . . . . . . . . . . . 1136.80 17.8 +6.0 +2.24
Apr. 30. . . . . . . . . . . . . . . . . . . 1136.55 17.1 -0.7 -0.27
May 31. . . . . . . . . . . . . . . . . . . 1131.41 7.4 -9.7 -3.62
June 30. . . . . . . . . . . . . . . . . . . 1130.85 6.7 -0.7 -0.27
July 31. . . . . . . . . . . . . . . . . . . 1130.63 6.4 -0.3 -0.11
Aug. 31. . . . . . . . . . . . . . . . . . . 1132.35 8.8 +2.4 +0.90
Sep. 30. . . . . . . . . . . . . . . . . . . 1134.43 12.1 +3.3 +1.27
WTR YR 1997 . . . . . . . . . . . . . . -- -- +0.4 +0.01
_______________________________________________________________________
04285000 Wrightsville Detention Reservoir
_______________________________________________________________________
Sep. 30. . . . . . . . . . . . . . . . . . . 634.15 102.7 -- --
Oct. 31. . . . . . . . . . . . . . . . . . . 634.57 106.0 +3.3 +1.23
Nov. 30. . . . . . . . . . . . . . . . . . . 634.49 105.4 -0.6 -0.23
Dec. 31. . . . . . . . . . . . . . . . . . . 634.45 105.1 -0.3 -0.11
CAL YR 1996 . . . . . . . . . . . . . . . -- -- +2.9 +0.09
Jan. 31. . . . . . . . . . . . . . . . . . . 634.20 103.1 -2.0 -0.75
Feb. 28. . . . . . . . . . . . . . . . . . . 635.22 111.3 +8.2 +3.39
Mar. 31. . . . . . . . . . . . . . . . . . . 636.40 121.1 +9.8 +3.66
Apr. 30. . . . . . . . . . . . . . . . . . . 636.02 117.9 -3.2 -1.23
May 31. . . . . . . . . . . . . . . . . . . 634.21 103.2 -14.7 -5.49
June 30. . . . . . . . . . . . . . . . . . . 634.02 101.7 -1.5 -0.58
July 31. . . . . . . . . . . . . . . . . . . 633.97 101.3 -0.4 -0.15
Aug. 31. . . . . . . . . . . . . . . . . . . 634.39 104.6 +3.3 +1.23
Sep. 30. . . . . . . . . . . . . . . . . . . 634.35 104.3 -0.3 -0.12
WTR YR 1997. . . . . . . . . . . . . . . . -- -- +1.6 +0.05
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