Tillotson Construction kicks off the 1950s with ubiquitous designs

Albert City, Iowa, ca. 1954

Albert City, Iowa, circa 1954.

Story by Kristen Cart

In the last post we studied the oddball Tillotson elevators that sprouted during the 1940s, the most creative period of elevator design. It was a time of multiple plans and innovations, and as the 1950s dawned, unworkable plans were dropped and popular designs emerged.

A surprising number of elevator ideas survived however, some with new names, as the Tillotson brand retained its distinctive features. Advances in engineering dominated the 1950s as elevator styles settled into lines that typified their makers.


Dallas Center, Iowa. Photo by Kristen Cart.

You can generally spot a Tillotson elevator by its rounded headhouse. Other subtle details are also telling trademarks. These style points became so common because a large portion of Tillotson’s building in the 1950s followed established designs, tweaked here and there for individual customers, without deviating greatly from the most popular plans.

We will examine the first of these enduring plans, which crossed over from the late 1940s, in this post.

Flagler by Gary Rich

Photo by Gary Rich.

Dike Plan:

This design was rolled out in 1947 with the elevator at Satanta, Kan., which had a 250,000-bushel capacity. No corresponding Dike, Iowa elevator is mentioned in our records, but presumably it was built (although I speculate whether the original Dike proposal sat on a desk without ever being approved, while Satanta’s updated elevator proceeded, thus the naming convention).


Photo by Kristen Cart.

The basic Dike elevator, with 252,000-bushel capacity, was built at Randall, Iowa (1949); West Bend, Iowa (1949); Pocahontas, Iowa (1949); Bushland, Tex. (1950); Pond Creek, Okla. (1950); Seibert, Colo. (1950); and Flagler, Colo. (1950). They all look like the typical Tillotson elevator, but with a larger-than-usual rounded headhouse.

The Satanta, Kan. (1947), and Gruver, Tex. (1947) elevators were built with a revised Dike plan, which was renamed the Satanta plan. They could be filled to a capacity of 250,000 or 265,000 bushels, respectively–the two elevators differed by five feet of draw-form height. Springfield, Colo. (1948); and Kildare, Okla. (1950); were also built with 250,000-bushel capacity using the Satanta (variously named Dike) plan.

The Pocahontas, Iowa, elevator, built using the Dike plan, got its own plan designation also. Into the mid-’50s, several elevators were built using the Pocahontas plan specifications: Albert City, Iowa (1954); Goldfield, Iowa (1954); Rockwell City, Iowa (1954); Thornton, Iowa (1955); and Dallas Center, Iowa (1955). Each could hold 252,000 bushels of grain.

Pocahontas, Iowa

Pocahontas, Iowa. Photo by Kristen Cart.

Because we are missing a page of the specifications for elevators built in 1954-1955, we do not know whether other elevators followed this plan, though I suspect some did.

The Tillotson Construction Company of Omaha continued to build for at least four years after our records ended. But reconstructing those records is a project for another time. In the next post, we will look at the Churdan and Jackson plans that originated in the late 1940s.


A Tillotson skyscraper dominates corn country in Randall, Iowa


Story and photos by Kristen Cart

During every elevator scouting trip, there comes a fork in the road where we choose which elevator to see, and which to save for another time. On the way home from Nebraska this summer we came to such a place at the junction of Iowa Route 175 and US 69 in central Iowa. To the north I could see the silhouette of an elevator at Jewell, and just east from Jewell, across the South Skunk River, the town of Ellsworth beckoned. But as I checked my map, to the south I saw Randall, which was a familiar name. I elected to turn south onto US 69.

The name should have been familiar, because it is found in several places in the Tillotson Construction Company records. The elevator in the central Iowa town of Randall was built in 1949 using the “Dike Plan.”


The elevator commands the Randall skyline

In the company records for subsequent projects at West Bend and Pocahontas, Iowa, both built using the Dike plan, the quantities of concrete and steel and the machinery details were summarized with the shorthand, “Like Randall,” for each project. The Dike plan was widely used for Tillotson’s quarter-million-bushel elevators.

The Randall elevator and its annexes overlooked a silent street of empty storefronts on that quiet Sunday. The co-op office looked new and efficient. The town was a perfect snapshot of the principle of economy-of-scale: the small business, like the small farm operation, must grow, combine forces, or die.

We have the construction records for Randall’s elevator and its siblings in West Bend and Pocahontas, which vary in minor details. Randall’s specifications follow.


The Randall Lumber Co. appears to be a survivor of the economic slump.



Capacity per plans (with Dock): 252,000 bushels

Capacity per foot of height: 2,520 bushels

Reinforced concrete per plans (total): 2,066 cubic yards

Plain concrete (hoppers): 40 cubic yards

Reinforcing steel per plans (including jack rods): 109.37 tons

Average steel per cubic yard reinforced concrete: 106 pounds

Steel and reinforced concrete itemized per plans:

Below main slab: 4,637 pounds steel, 40 cubic yards concrete

Main slab: 39,291 pounds steel, 266 cubic yards concrete

Drawform walls: 129,000 pounds steel, 1,430 cubic yards concrete

Work and Driveway floor (including columns): 3,700 pounds steel, 24 cubic yards concrete

Deep bin bottoms: 11,832 pounds steel, 58 cubic yards concrete

Overhead Bin bottoms: 4,876 pounds concrete, 30 cubic yards concrete

Bin roof (or garner): 8,791 pounds steel, 56 cubic yards concrete

Scale floor (complete): none

Cupola walls: 8,404 pounds steel, 92 cubic yards concrete

Distributor floor: 1,848 pound steel, 11 cubic yards concrete

Cupola roof: 2,360 pounds steel, 18 cubic yards concrete

Misc. (boot, leg, head, track sink, steps, etc.): 3,000 pounds steel, 30 cubic yards concrete

Attached driveway: 1000 pounds steel, 11 cubic yards concrete (driveway extension, walls and roof)

DSC_0664Construction details

Main slab dimensions (drive length first dimension): 60′ x 72 1/2′

Main slab area (actual outside on ground): 4,200 square feet

Weight reinforced (total) concrete (4000 pounds per cubic yard plus steel): 4,241 tons

Weight plain concrete (hoppers 4000 pounds per cubic yard): 74 tons

Weight hopper fill sand (3000 pounds per cubic yard): 985 tons

Weight of grain (at 60 pounds per bushel): 7,560 tons

Weight of structural steel and machinery: 20 tons

Gross weight loaded: 12,880 tons

Bearing pressure: 3.06 tons per square foot

Main slab thickness: 21″

Main slab steel: bent 1″ square at 7″ o. c. spacing

Tank steel and bottom (round tanks): 1/2″ diameter at 9″ o. c. spacing

Lineal feet of drawform walls: 655 excluding extension

Height of drawform walls: 120′

Pit depth below main slab: 14’9″

Cupola dimensions (outside width x length x height): 24 1/2′ x 50 1/4′ x 40′

Pulley centers: 165.25′

Number of legs: 1

Distributor floor: yes

Track sink: yes

Full basement: yes

Electrical room: yes

Driveway width clear: 12′

Dump grate size: 2 at 9′ x 6′ and 9′ x 14′

Column under tanks size: 20″ square

Boot legs and head: concrete

DSC_0635Machinery details

Boot pulley: 72″ x 14″ x 2 3/16″

Head pulley: 72″ x 14″ x 3 15/16″

R.P.M. Head pulley: 42

Belt: 355′, 14″ 6 ply Calumet

Cups: 12″ x 6″ at 8 1/2″ o. c. spacing

Head drive: Howell 40 horsepower [3 circled here]

Theoretical leg capacity (cup manufacturers rating): 7,920 bushels per hour

Actual leg capacity (80% of theoretical rating): 6,340 bushels per hour

Horsepower required for leg (based on above actual capacity plus 15% for motor): 32 horsepower

Man lift: 2 horsepower Ehr.

Load out scale: 10 Bu. Rich.

Load out spout: 10″ w.c.

Cupola spouting: 10″ diameter 14 gauge

Truck lift: 7 1/2 horsepower Ehr.

Dust collector system: Fan to bin

Driveway doors: 2 overhead rolling

Conveyor: provision


3 bin distributor under scale

Provision for hopper scale