C.A.P. Turner

Claude Allen Porter Turner (July 4, 1869 – January 10, 1955) was an American structural engineer who designed a number of buildings and bridges, particularly in the U.S. states of Iowa, Minnesota, and Wisconsin.

Turner was born in Lincoln, Rhode Island and attended Lehigh University's school of engineering in Bethlehem, Pennsylvania, graduating in 1890. He worked for several companies in the Eastern United States before moving to Minneapolis, Minnesota in 1897. He formed his own company in 1901 and received a patent in 1908 for a flat-slab support system (also known as "mushroom cap" columns) using reinforced concrete. He later received over 30 patents. Turner died in Columbus, Ohio in 1955.

Notable designs by Turner include the Aerial Ferry Bridge in Duluth, Minnesota, the 2,730 ft Arcola High Bridge (North of Stillwater, Minnesota, on the St. Croix River), the Fort Snelling-Mendota Bridge in the Twin Cities, the Liberty Memorial Bridge between Bismarck and Mandan, North Dakota, and the Hoffman Building in Milwaukee, Wisconsin.