In response to a reader’s question, we are posting some basic specifications of the Alta, Iowa, elevator that Tillotson Construction Co. built in 1950. (Plans alter between “Tillotson Contracting Co.” and “Tillotson Construction Co.”
The drawings seen above are Tillotson’s standard plan for a 250,000-bushel elevator with eight tanks (silos).
Capacity at Alta was 246,070 bushels. The eight tanks of 18 feet in diameter sat on a main slab of 60.0 by 73.5 feet. The driveway was 13 x 15 feet.
The walls of the tanks rose 115 feet from the slab, and they were topped by the cupola measuring 23.0 feet wide, 61.5 feet long, and 39 feet high. That brought the structure up to 154 feet–quite imposing.