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Water-Year Summary for Site 01029500

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  • Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
  • For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
  • For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
  • For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
  • Not all sites have reports available for every water year.
Available Parameters
00060 Discharge(Mean)  
00065 Gage height(Mean)  

Water year 2024: 2024-10-01 to 2025-09-30
 
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USGS Water-Year Summary 2024
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.
SURFACE-WATER RECORDS
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.
REMARKS - Flow regulated by Chamberlain, Telos, Second, Grand Lakes, and Round Pond. Final regulation at Grand Lake Dam 35 mi upstream.
  • Water Year 2020: Records good, except for estimated daily discharges, which are poor.
  • Water Year 2019: Records good, except for estimated daily discharges, which are poor.
  • Water Year 2018: Records good, except for estimated daily discharges, which are poor.
  • Water Year 2017: Records good, except for period of ice effect, Nov. 29 to Apr.11, which are poor.
  • Water Year 2016: Records good, except for periods of ice effect, Nov. 25 to Dec. 3, Dec. 16-24, and Dec. 27 to Mar. 29, which are poor.
  • Water Year 2015: Records good, except for periods of ice effect, Nov. 20-22, Nov. 27 to Dec. 10, and Dec. 18 to Apr. 17, which are poor.
  • Water Year 2014: Records good, except for periods of ice effect, Nov. 21-27, Nov. 30 to Apr. 16, and April 18-19, which are poor.

    • 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.