| |
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, 4,421 mi2—excludes 214 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 with satellite telemeter. Datum of
gage is 5.18 ft above National Geodetic Vertical Datum of 1929. Prior
to Mar. 7, 1934, at Boot 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--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.
COOPERATION BY--Massachusetts Department of
Environmental Protection, Division of Watershed Management,
Massachusetts Department of Conservation and Recreation, and U.S.
Geological Survey Federal Network
|
|
U.S. Department of the Interior |
U.S. Geological Survey
