The great Western Avenue" O.
yer Boston and Roxbury mill-dam, was
opened on Monday, last week. A
splendid cavalcade of citizens, on horse
back and in carriages, passed over. This
work, by a company of private citi-
zens, cost about 100000. It's from
90 to 100 feet wide, with stone sides,
8 feet thick at the bottom, and 8 at the
top, and from i2 to II feet in height.