This station is operated in cooperation
New York City Department of Environmental
Lat 41°47'57", long 74°25'48"
referenced to North American Datum of 1927, Ulster County, NY,
Hydrologic Unit 02020007, at release chamber at Merriman Dam on Rondout
Creek, 1.1 mi upstream from Brandy Brook, and 1.3 mi northwest of
PERIOD OF RECORD.--
May 1951 to September 2013 (month-end
elevations, contents, and diversions). October 2013 to current year
(daily observation elevations).
Water-stage recorder. Datum of gage is NGVD of 1929
(levels by Board of Water Supply, City of New York).
Elevation record and capacity table provided by
New York City Department of Environmental Protection.
Reservoir is formed by an earthfill rockfaced dam;
storage began May 10, 1951. Initial filling (to crest of spillway) Mar.
28, 1955. Usable capacity 50,048 mil gal between minimum operating
level, elevation 720.00 ft, and crest of spillway, elevation 840.00 ft.
Dead storage below elevation 720.00 ft, 2,387 mil gal. Figures given
herein represent total contents. Reservoir impounds water from Rondout
Creek; water diverted from Cannonsville Reservoir in the Delaware River
basin through West Delaware Tunnel; water diverted from Pepacton
Reservoir through East Delaware Tunnel; and water diverted from
Neversink Reservoir through Neversink-Grahamsville Tunnel. Water is
diverted (01366399) from Rondout Reservoir for New York City water
supply through West Branch Tunnel of Delaware Aqueduct. Diversion began
April 1944 by means of temporary emergency connection to aqueduct.
Capacity table (elevation, in feet, and total contents, in millions of gallons)
Elevation Contents Elevation Contents
720.0 2,387 800.0 28,705
740.0 6,125 820.0 39,645
760.0 11,709 840.0 52,435
780.0 19,401 843.0 54,505
EXTREMES FOR PERIOD OF RECORD.--
Maximum contents observed,
54,346 mil gal, Apr. 3, 2005, elevation, 842.77 ft; minimum contents
observed (after initial filling), 8,335 mil gal, Oct. 15, 1957,
elevation, 748.75 ft.