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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.

USGS 01105607 WHITMANS POND FLOOD BY-PASS AT EAST WEYMOUTH, MA

PROVISIONAL DATA SUBJECT TO REVISION

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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--Data Collection Platform with satellite telemeter. 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 61.12 ft above Town of Weymouth datum. Subtract 5.83 ft from gage height values to adjust to National Geodetic Vertical Datum of 1929.
REMARKS--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 BY--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

Boating safety tips
This station managed by the Northborough MA Field Office.

Available Parameters Available Period
All 1 Available Parameters for this site
  
00065 Gage height 2014-08-20  2017-08-19

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Gage height, feet

Most recent instantaneous value: 64.98 08-19-2017   15:00 EDT
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