Court, June 6, 1639, It was ordered that all weers shall be set open from the last day of the weeke at noon till the second day in the morning (Saturday noon till Monday morning).
The weir granted to Winthrop and Cradock in 1634, was at the outlet of Mystic lake, where High street, Medford, crosses Mystic river at what is known as Weir bridge.
Cutter says, The Mystic River, of which the ancient Menotomy River is a branch, has its source in Mystic Pond, which was shown on Wood's map of Mass., 1633.
The names of Mystic and Menotomy rivers are apparently aboriginal designations, and like all Indian names probably describe the locality to which they were affixed.
Trumbull gives the origin of the name Mystic (anciently written Mistick,) as applied to the Medford river, thus:
Tuk in Indian, denotes a river whose waters are driven in waves by the tide or winds.
With the adjectival missi, great it forms missi-tuk, now written Mystic—the name of the great river of Boston Bay.