The great structure was built under the direction of Resident Engr. Milton Murr of the Northwestern Rwy by White & Duffy of Milwaukee, WI as general contractors, the Joseph McCarty Construction Company of Kaukauna, WI as sub-contractors for the concrete and by crews of Northwestern Rwy men who performed the work on the tracks, pile driving, handling of great slabs of concrete, forming the overhead operations were begun. The White & Duffy Company made the excavation employing a huge steam shovel for many months on the project.

Clinton Herald,August 1, 1922

Giving some idea of the size of the great structure, it was announced today that the cost of the subway is about $400,000, while for its construction the contractors removed 15,000 cubic yards of dirt, 6,000 yards of solid rock, poured 3,000 cubic yards of concrete and used about 426,900 pounds of steel reinforcing, including I beams, rods, etc.

Clinton Herald, August 1, 1922

Excavation of the subway proceeds.

Work progresses on the slab over the sidewalk. Note the Northwestern Rwy Depot in the background. June 8, 1922

An average of 50 men were employed daily from the time the work began early in October of 1921 until the present time, with a maximum at times of from 125 to 150 men. Many men are still employed on the work as considerable remains to be done, including the installation of electric lights, water-proofing of the overhead crossing, installation of the pumping systems, painting of the hand-railings, etc.

Clinton Herald, August 1, 1922