Alexander Hamilton and George Washington visited the Great Falls
and began to imagine the industrial potential of the area. In
1791, Hamilton and others founded the Society for Establishing
Usefull Manufactures (S.U.M.) and a "raceway" was
designed by Pierre Charles L'Enfant (chief architect and planner
of Washington, DC) to divert water from above the falls into
the area's first mill. The design was simplified by Peter Cold
and went into operation in 1794 and extended in 1801
to power additional mills. A major expansion in 1828 added
an upper raceway that extended to the south, then looped back
to the north to connect to the existing raceway. The final
modification was made in 1838 to replace the source reservoir
with with a masonry dam across the river and a new channel
through rock to feed the raceway.
In 1876, the S.U.M. estimated the available water power
at 2,108 horsepower (1.6 MW), with about 87% of that actually
being harnessed. The raceway served the community for the remainder
of the 19th century before being outmoded in the early 20th century.
(reference)
My tour of the raceway ended at a fence surrounding the ruins
of the
Allied Textile Printing Facility, which has been the source
of great controversy between developers who covet its lovely
river views and preservationists who covet its industrial legacy.