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C.A.P. Turner collection

Identifier: N137

Scope and Content Note

The collection consists of positive photostats of plans and details for the Walker Commission Warehouse in Minneapolis, Minnesota, designed by the firm of Klarquist & Sons. In addition, the collection contains column details and first floor plans for the Minneapolis Brewing Company.


  • Creation: 1910, 1912


Language of Materials


Restrictions on Access

Available for use in the Manuscripts Division reading room. Advance notice is requested.

Restrictions on Use

Please contact staff regarding copyright status of these materials. Researchers may quote from the collection under fair use provisions of the copyright law (Title 17, U.S. Code).

Biographical Note

Claude A.P. Turner was born in Lincoln, Rhode Island on July 4, 1869. He graduated in 1890 from the school of engineering at Lehigh University, (Bethlehem, Pennsylvania). He worked for numerous companies, including the New York & New England Railroad, Edgmore Bridge Co. (Philadelphia), Columbus (Ohio) Bridge Co., Pittsburgh Bridge Co., and Pottsville Iron & Steel Co. (Pennsylvania), before coming to Minneapolis in 1897. Turner was employed as an engineer with the Gillette Herzog Company and American Bridge Company until 1901, when he formed his own firm. In 1908, he received a patent for the flat-slab support system (also called the "mushroom cap" column system) in reinforced concrete, which he used in many later buildings and bridges. He went on to be granted more than 30 more patents for reinforcement and reinforced concrete.

Turner's structures included the Duluth Ferry Bridge (1906); Johnson-Bovey Building (1905-1906) and Wisconsin Central Freight Station (1907), Minneapolis; Lindeke-Warner Building (1908-1909), Hamm Brewing Co. stockhouse (1907), and West Publishing Co. (1910), St. Paul; Soo Line Railroad bridge, New Richmond, WI (1910-1911); Hoffman Building (1906), Milwaukee; courthouses in Green Bay, WI, Fairmont, MN, and Vinton, IA, and the South Dakota State Capitol, Pierre. Turner died in Columbus, Ohio on January 10, 1955.


1.0 Cubic Feet


Collection contains plans for the Minneapolis Brewing Company and Walker Commission Warehouse, engineered by C.A.P. Turner.


The collection is organized alphabetically by commission name.

Physical Location

High Bay

Additional Finding Aid

An unpublished finding aid with detailed contents is available in the Manuscripts Division.

C.A.P. Turner collection
Archives Staff
Language of description
Script of description
Language of description note

Collecting Area Details

Contact The Northwest Architectural Archives Collecting Area