...ble portions were deposited in the tortuous channel of the brook and they created a nuisance therein. That, together with the unsanitary conditions prevailing in part of the cities of Cambridge and Somerville and the towns of Arlington and Belmont, was the principal cause of the erection of the Cradock dam in Medford center. In the year 1861 the city of Charlestown obtained an act of the General Cour...