USGS Water-Year Summary 2021
01029500 EAST BRANCH PENOBSCOT RIVER AT GRINDSTONE, ME
LOCATION - Lat 45°43'49", long 68°35'22" referenced to North American Datum of 1983, Penobscot County, ME, Hydrologic Unit 01020002, on left bank 500 ft downstream from Bangor and Aroostook Railroad bridge, 0.5 mi south of Grindstone, and 9.5 mi upstream from confluence with West Branch Penobscot River.
DRAINAGE AREA - 837 mi² of which -,249 mi² probably is noncontributing. Drainage area is 1,086 mi², including 249 mi² drained by Chamberlain Lake through Telos Canal.
PERIOD OF RECORD -
DISCHARGE: October 1902 to September 1982 (monthly discharge only for some periods). October 1999 to current year.
GAGE HEIGHT: May 1998 to September 1999.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 294.74 ft above National Geodetic Vertical Datum of 1929. Prior to June 30, 1929, nonrecording gage on railroad bridge at same datum.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 37,000 ft³/s, Apr. 30, 1923, gage height 16.9 ft, site then in use; minimum daily discharge, 77 ft³/s, Nov. 19, 1924.