LOCATION--Lat 42° 17'16", long 72° 51'53", Hampshire County, Hydrologic Unit 01080206, on left bank at Knightville, 0.2 mi downstream from Knightville Dam, 0.2 mi upstream from Sykes Brook, 2.4 mi upstream from Middle branch, 3.5 mi north of Huntington, and at mile 29.7.
DRAINAGE AREA--161 mi².
PERIOD OF RECORD--Discharge: August 1909 to September 1990, October 1995 to current year.
Water-quality records: Water year 1953.
REVISED RECORDS--WSP 415: 1909–12. WSP 1001: 1941–43. WSP 1231: 1910, 1912, 1913(M), 1914–15, 1916–19(M), 1921–23(M), 1925–27(M), 1929–33(M), 1935(M). WDR MA-RI-84-1: drainage area.
GAGE--Data Collection Platform with satellite telemeter. Datum of gage is 460.62 ft above NAVD 1988, from levels by U.S. Army Corps of Engineers. Prior to May 11, 2020, datum reported as 461.25 ft above NGVD 1929, from levels by U.S. Army Corps of Engineers, obtained from elevation of RM-2 used as 466.88 ft above mean sea level by Corps of Engineers (The source of this elevation is B.M. P-6, U.S.C. & G.S. at Huntington, elevation, 381.91 ft, datum of 1929). Prior to Jan. 11, 1936, non-recording gage at site 0.5 mi upstream at different datum. Jan. 11, 1935, to May 20, 1940, water-stage recorder at site 700 ft upstream at datum 10.57 ft higher. May 21 to Dec. 19, 1940, non-recording gage at site 700 ft upstream at datum 18.75 ft higher.
REMARKS-- Flow regulated by Knightville reservoir since 1941.
COOPERATION BY--U.S. Army Corps of Engineers