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ICE EFFECTS ON STREAMFLOW During winter, ice formation may cause stage and discharge values to appear higher than expected. Ice effects may be minor (occurring only at night and early morning) with baseline flows obvious, or the effects may be major (stage constantly increases over several days or weeks) resulting in greatly erroneous discharge. Streamgages experiencing minor ice conditions will continue to display stage and discharge values to enable users to estimate the approximate base-line stage and discharge. Streamgages experiencing major ice conditions will have the discharge record temporarily disabled to prevent use of erroneous discharge values. The discharge record will resume when it is determined that ice conditions are no longer present. Daily mean discharges during periods of ice effect will be estimated after detailed data analysis.



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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 satellite telemeter. Stage sensor is attached to footbridge pier and is located in Whitman's Pond. Datum of Whitman's Pond gage is 73.79 ft above Town of Weymouth datum. Subtract 5.83 from gage height values to adjust Town of Weymouth datum to National Geodetic Vertical Datum of 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.
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
Spillway 72.47

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

This station managed by the Northborough MA Field Office.

Available Parameters Available Period
All 2 Available Parameters for this site
00060 Discharge 2002-03-09  2017-09-19
00065 Gage height 2007-10-01  2017-09-19

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Instantaneous-data availability statement

Discharge, cubic feet per second

Most recent instantaneous value: 0.99 09-19-2017   08:15 EDT
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Daily discharge, cubic feet per second -- statistics for Sep 19 based on 15 years of record more
Most Recent
Value Sep 19
Median Mean 75th
0.01 0.56 0.99 2.7 4.9 5.5 22.7

Gage height, feet

Most recent instantaneous value: 71.77 09-19-2017   08:15 EDT
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