LOCATION.--Lat 43°53'50", long
75°03'05" referenced to North American Datum of 1927,
Herkimer County, NY, Hydrologic Unit 04150101, in gate house at
Stillwater Dam on Beaver River, 2.5 miles upstream from Moshier
Creek, and 7.5 miles west of Beaver River post office.
DRAINAGE AREA.--171 mi².
PERIOD OF RECORD.--May 1908 to current year. Prior to
February 1925, month-end contents only, published in WSP 1307.
February 1925 to September 1937, published in WSP 824. Prior to
October 1999, daily observations at 0800 hours.
REVISIONS HISTORY.--WDR NY-85-1: Drainage area.
GAGE.--Water-stage recorder. Datum of gage is NGVD of
1929, adjustment of 1912. To convert elevations to NAVD of
1988, add 0.49 ft.
COOPERATION.--Supplemental elevation record and capacity
table provided by Board of Hudson River-Black River Regulating
District.
REMARKS.--Reservoir originally formed about 1885;
enlarged at various times and in 1924 enlarged to a usable
capacity of 4,623 mil ft³ between elevations 1,650.3 ft and
1,679.3 ft (top of 24-inch flashboards in place throughout
year). Elevation of gate sill of lowest outlet, 1,642.3 ft.
Capacity below elevation 1,650.3 ft, 100 mil ft³, is included
in records presented herein, but is not ordinarily available
for release. Figures given herein represent total contents.
Reservoir is used to regulate flow of Beaver and Black Rivers
for flood control, power development and general public
welfare.
Capacity table (elevation, in feet, and total contents, in millions of cubic feet)
Elevation Contents Elevation Contents
1,650.3 100 1,670.0 2,441
1,658.0 614 1,675.0 3,566
1,660.0 831 1,679.3 4,723
1,665.0 1,528 1,680.0 4,926
EXTREMES FOR PERIOD OF RECORD.--Maximum observed
elevation, 1,680.15 ft, Apr. 29, 2011, contents, 4,969 mil ft³;
minimum observed since first filling, 1,644.80 ft, Mar. 25-27,
1949, contents, 8 mil ft³.