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LOCATION--Lat 42o12'39", long
70o55'46", 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--Gage height: January 2002 to current year.
GAGE--Data Collection Platform with telephone telemeter. Datum of gage at Town of Weymouth datum. Subtract 6.67 ft from gage height values to adjust to NAVD 1988. Subtract 5.87 from gage height values to adjust to NGVD 1929.
REMARKS--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. Discharge record below 10 cfs considered poor.
COOPERATION BY--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):
|Siphon Unit 2||72.47|
|Siphon Unit 3||72.57|
|Siphon Unit 1||72.67|
|Siphon Unit 4||72.77|