LOCATION.--Lat 42° 38’45", long 71°
17’56", Middlesex County, Hydrologic Unit 01070002, on right bank at
Lowell, 1,100 ft downstream from Concord River.
DRAINAGE AREA.--Total above gage, 4,635 mi2; net above gage,
4,425 mi2—excludes
210 mi2 for use of Boston metropolitan district and city of
Worcester.
PERIOD OF RECORD.--Discharge: June 1923 to current year.
Water-quality records: Water years 1954, 1966–74, 1999.
GAGE.--Water-stage recorder. Datum of gage is 5.18 ft above sea level.
Prior to Mar. 7, 1934, at Boott Mills, 1,800 ft upstream and 700 ft above
mouth of Concord River, in same gage pool and at same datum; gage-height
record (provided by Proprietors of the Locks and Canals on Merrimack River)
was indicative of flow including that of Concord River.
REMARKS.--Records excellent. Daily discharge includes water released from
210 mi2 in basins of Sudbury and Nashua Rivers and Lake
Cochituate. Flow regulated by powerplants, by Franklin Falls Reservoir since
1942, and by Squam, Newfound, Winnipesaukee, Winnisquam, and other lakes and
reservoirs upstream. Telephone and satellite gage-height telemeters at
station.
COOPERATION BY.-- Massachusetts Department of Environmental Protection, Division of Watershed Management, Massachusetts Dept of
Conservation and Recreation and U.S. Geological Survey Federal Network.
