USGS Water-Year Summary 2024

04285000 WRIGHTSVILLE DETENTION RESERVOIR AT WRIGHTSVILLE, VT

LOCATION - Lat 44°18'38", long 72°34'31" referenced to North American Datum of 1927, Washington County, VT, Hydrologic Unit 04150403, at Wrightsville Detention Reservoir Dam on North Branch Winooski River, 0.2 mi east of Wrightsville Dam Road and State Highway 12 intersection in Wrightsville, 0.3 mi downstream from Long Meadow Brook, 2.4 mi north of the State Capital Building in Montpelier, and 4.4 mi upstream from mouth.

DRAINAGE AREA - 66.5 mi².

SURFACE-WATER RECORDS

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 September 2008 (monthend readings only). October 2008 to current year.

GAGE - Water-stage recorder. Datum of gage presented here is at National Geodetic Vertical Datum of 1929. To obtain water-surface elevation above North American Vertical Datum of 1988 subtract 0.26 feet from reservoir water-surface elevation data. Prior to July 28, 1960, nonrecording gage at present site at datum 612.75 ft above National Geodetic Vertical Datum of 1929.

COOPERATION - Vermont Department of Environmental Conservation.

REMARKS - 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.

Usable Capacity table
Elevation, in feet  Contents, in millions of cubic feet
612.75                0
620.00               22.0
630.00               72.3
640.00              153.1
650.00              258.6
660.00              391.2
670.00              549.7
680.00              753.3
685.00              873.5

EXTREMES FOR PERIOD OF RECORD - Maximum elevation, 684.15 ft, July 11, 2023; minimum observed, 613.00 ft, August 17, 1949 and August 17-19, 1950.