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LOCATION
LOCATION.--Lat 42o12'40", long 70o55'47",
Norfolk County, Hydrologic Unit 01090001, on Whitman's 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 lower retaining wall of Whitman's Pond
Dam and is located in Iron Hill Pond. Datum of Iron
Hill Pond gage is 61.16 ft (Town of Weymouth datum). Subtract 5.83 ft from gage
height values to adjust Town of Weymouth
datum to National Geodetic Vertical Datum of 1929 (NGVD).
REMARKS.--Records not rated. Flows affected by withdrawals for public water
supply of Weymouth. High flows affected by diversions to flood by-pass system at
Iron Hill Dam. 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.--The flood by-pass system includes four
siphon openings located at Iron Hill Pond Dam which are designed to by-pass flood flows
around the Iron Hill Pond Dam fish ladder directly to the flood by-pass system.
By-pass flood flows discharge to the inter-tidal zone downstream of Jackson Square. The following
list shows the bottom elevations for each set of four siphon openings. Siphon
Unit 2 is the first unit to by-pass flood flows.
Iron Hill Pond Dam.--flows by-pass Iron Hill Pond fish ladder and enter flood by-pass system when
Iron Hill Pond elevation exceeds the following
siphon inlet elevations (Town of Weymouth Datum, in feet):
| Siphon Unit 2 |
65.25 |
| Siphon Unit 3 |
65.35 |
| Siphon Unit 1 |
65.45 |
| Siphon Unit 4 |
65.55 |
Photo of
Whitman's Pond and Iron Hill Pond Gage Shelter
Photo of Iron Hill Pond Sensor Location
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