USGS Water-Year Summary for Site 01080000

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	00065 Gage height(Mean)
	00095 Specific cond at 25C(Mean)
	00300 Dissolved oxygen(Mean)
	00400 pH(Med.)

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Water year 2024: 2024-10-01 to 2025-09-30

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USGS Water-Year Summary 2024

01080000 LAKE WINNIPESAUKEE AT WEIRS BEACH, NH

LOCATION - Lat 43°36'27", long 71°27'34" referenced to North American Datum of 1927, Belknap County, NH, Hydrologic Unit 01070002, 600 ft east of Weirs Beach Post Office, 1,600 ft north of US Highway 3 bridge across Paugus Bay at Weirs Beach, 4.7 mi southeast of Meredith, and 5.3 mi north of Laconia Post Office.

DRAINAGE AREA - 363 mi². at outlet at Lakeport.

REVISIONS HISTORY - WDR NH-VT-78-1: 1938-77 (datum correction). WDR NH-VT-99-1: 1998. WDR NH-VT-02-1: 1988-2001 (datum correction).

SURFACE-WATER RECORDS

PERIOD OF RECORD - Gage heights: September 1933 to June 2005 (discontinued). Prior to November 1937, month end contents only, published in WSP 1301. Prior to October 1970, published as "at The Weirs."

GAGE - Water-stage recorder. Datum of gage is 500.00 ft above National Geodetic Vertical Datum of 1929. Prior to November 1937, nonrecording gage at lake outlet at Lakeport at datum 0.55 ft higher. November 24, 1937 to November 7, 1965, water-stage recorder at site 500 ft southeast at datum 0.08 ft lower. November 7, 1965 to September 1987, at water-stage recorder at present site at datum 0.08 ft lower.

REMARKS - Lake used for recreation and conservation for development of water power. Usable capacity, 7.21 billion ft³ between elevations 500.57 ft and 504.24 ft above National Geodetic Vertical Datum of 1929. Stage regulated at outlet and by Wentworth, Merrymeeting, and other lakes. Capacities given herein are computed from gage height at midnight on last day of month.

Capacity table furnished by State of New Hampshire, Department of Environmental Services:
Gage-height, in feet     Contents, in millions of cubic feet
2.0                      13,840
3.0                      15,810
4.0                      17,800
5.0                      19,810

EXTREMES FOR PERIOD OF RECORD - Maximum daily gage height, 5.94 ft (datum then in use), June 4, 1984; minimum daily gage height, 0.63 ft (datum then in use), December 11, 1941.

WATER-QUALITY RECORDS

PERIOD OF RECORD - WATER TEMPERATURE: June 2016 to September 2016. SPECIFIC CONDUCTANCE: June 2016 to September 2016. pH: June 2016 to September 2016. DISSOLVED OXYGEN: June 2016 to September 2016.

INSTRUMENTATION - In-situ monitor deployed in buoy moored 900 ft southeast of gage house and 3 ft below water surface.

REMARKS - Water Year 2016: Records good.