Straits Pond and the Weir River are designated an Area of Critical Environmental Concern (ACEC) with class SB standards. The SB designation means there are strict standards of protection: no degradation of water quality allowed under the law.
SIZE: approximately 92 acres of salt pond (1980 survey 91.4 acres).
LOCATION: on the Hull/Cohasset border
DEPTH: approximately 1–1.5 meters. The depth varies with the tides and seasons and is controlled by a tidal gate at the west end (West Corner) of the pond.
TOPOGRAPHY: highly variable and inconsistent> The highest point is just west of Tad Lane in Cohasset for an elevation of 102' above mean sea level (MSL); the lowest elevation is Straits Pond which varies between 3-4' above MSL. Tide gate is at an elevation of 3.0+ MSL
WATER VOLUME: 98,310,00 gallons or 13,140,000 cubic feet (calculated in 1980)
FLUSHING TIME: is defined as the time it takes one pond volume of water to discharge from the pond. In 1980, the flushing time was figured as 71 days because the Pond area is large relative to the watershed area. Note: It is easier to get water out of the Pond than to refill it as water drains out of the gate at low tide, but typically it takes several high tides to replace the water.