USGS Water-Year Summary 2021
01174500 EAST BRANCH SWIFT RIVER NEAR HARDWICK, MA
LOCATION - Lat 42°23'36", long 72°14'20" referenced to North American Datum of 1927, Worcester County, MA, Hydrologic Unit 01080204, on left bank 100 ft upstream from spillway of regulating dam and 4.6 mi northwest of Hardwick.
DRAINAGE AREA - 43.7 mi².
PERIOD OF RECORD - Discharge: January 1937 to current year. Published as "near Dana" January 1937 to September 1939. Water-quality records: Water year 1957.
GAGE - Water-stage recorder with satellite telemeter. Concrete spillway since Mar. 12, 1940. Datum of gage is 504.70 ft above National Geodetic Vertical Datum of 1929.
COOPERATION - Massachusetts Department of Conservation and Recreation, Division of Water Supply Protection, Office of Watershed Management.
DATUM - Land-surface datum is 504.7 ft above National Geodetic Vertical Datum of 1929. Measuring point: MEASURINGPOINT.
PERIOD OF RECORD - Water-quality records: Water year 1957.