"The Old Colony Railroad was incorporated in March 1844 to link Boston with the town of Plymouth. The line opened between South Boston and Plymouth in November 1845, and to its terminus near the present South Station the following year. In 1854, the railroad merged with the Fall River Railroad, giving the company its most famous connection to New York City: steamers which ran for many years between Fall River and the metropolis. The Old Colony continued to expand, with branch lines and connecting cross-country routes. The Old Colony network became part of the New Haven Railroad system in 1893 with a long-term lease by the larger Connecticut-based road. At its peak around 1900, the Old Colony system consisted of over 600 route miles. The core route, Boston-Plymouth, had seven inbound trains each weekday in 1898. After World War I, passenger service declined, and in 1959, all service was terminated.
The Monatiquot River Bridge is a granite block circular arch with stone and gravel topping. The structure was built previous to 1893, but in 1905 the barrel vault was extended about twelve feet to the east. The break between the two sections is visible; the newer arch ring displays a keystone among the rough-faced granite voussoirs.
The skew angle is 0 degrees at both abutments. Width, out to out, is 48'-0". The intrados span is 22'-3". The rise from current water elevation to the soffit is 17'-0". Depth of topping at the crown is 9'-4".
Not far distant, at milepost 0.22, is a smaller, 10-foot span stone-arched culvert, probably constructed at the same time as the main arch. At the railroad's intersection with Pearl Street, a few hundred feet to the north formerly stood the large Rice & Hutchins shoe factory (now demolished)."
-P.H. Stott, MBTA Old Colony Railroad Rehabilitation Project, 2/1989