PROVISIONAL DATA SUBJECT TO REVISION

LOCATION.--Lat 42^o12'39", long 70^o55'46", Norfolk County, Hydrologic Unit 01090001, on Whitmans Pond Dam, approximately 1,000 ft upstream from Iron Hill Dam, and 1,300 ft upstream from Whitman's Pond Outlet gage below Iron Hill Street, at East Weymouth, MA.
DRAINAGE AREA.--12.4 mi².
PERIOD OF RECORD.--January 2002 to current year.
GAGE.--Water-stage recorder with satellite telemeter at station. Stage sensor is attached to footbridge pier and is located in Whitman's Pond. Datum of Whitman's Pond gage is 67.96 ft (Town of Weymouth datum). Subtract 5.83 from gage height value to adjust Town of Weymouth datum to National Geodetic Vertical Datum of 1929 (NGVD).
REMARKS.--Stage only, records not rated. Flows affected by withdrawals for public water supply of Weymouth. The Old Swamp River gage (01105600) is located 0.4 mi upstream from Whitman's Pond, South Cove, and points of water withdrawals and diversions.
COOPERATION.--Town of Weymouth, MA.

FLOOD BY-PASS SIPHON INFORMATION.--Whitman's Pond Dam contains four siphon openings which are designed to by-pass high flows around the Whitman's Pond Dam fish ladder directly to the lower Iron Hill Pond. The four siphon openings located at Iron Hill Pond Dam are designed to by-pass flood flows around the Iron Hill Pond Dam fish ladder directly to the flood by-pass system that discharges flood flows to the inter-tidal zone downstream of Jackson Square. The following list shows the bottom elevations for the Whitman's Pond Dam siphon openings. Siphon Unit 2 is the first unit to by-pass flood flows to Iron Hill Pond and is at the same elevation as the spillway.

Whitman's Pond Dam.--flows by-pass Whitman's Pond fish ladder when Whitman's Pond elevation exceeds the following siphon inlet elevations (Town of Weymouth Datum, in feet):

Photo of Whitman's Pond and Iron Hill Pond Gage Shelter
Photo of Whitman's Pond Staff Reference Gage and Sensor Location