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William Donald Scherzer (January 27, 1858 – July 20, 1893) was an American engineer who invented the rolling lift bridge.
Scherzer's parents were William and Wilhelmina Scherzer, who immigrated from Germany in 1847. Scherzer was born in Peru, Illinois on January 27, 1858 as the second son in a family of three sons and one daughter.
Scherzer received his primary education in public schools. He exhibited talent in art and mathematics, where his father had exhibited talent in music and art. After elementary school Scherzer entered the private schooling of Professor Eggers at the age of 15 for college prep courses. He later then took up civil engineering at the Polytechnicum college in Zurich, Switzerland when he was eighteen years old. There he was at the top of his class. Scherzer was considered a competitor both in play and studies by all that knew him closely. He graduated from the Zurich engineering college in 1880.
Scherzer returned to America in 1880 and took the position of engineer for three years at the Matthiessen & Hegeler Zinc Company at La Salle, Illinois. In 1883 he was employed by the Pittsburg, Fort Wayne & Chicago Railway Company. He took up the specialty field of bridge engineering. Scherzer in 1885 was employed as the assistant to the chief engineer of the Keystone Bridge Company of Chicago. He was there for eight years. Scherzer entered into business for himself in 1893 in Chicago as a consulting and contracting engineer. 
Scherzer was the inventor of a refinement of the bascule bridge called the Scherzer rolling lift bridge. His last engineering work before he died, done in 1893, was the design of two of these rolling lift bridges in Chicago. His design pivots the bridge like a rocking horse. The friction is lowered because it is rolling friction. Moreover when the bridge is open the channel is completely free as the mechanism has rolled away the bridge from the edge leaving the passage free for wide traffic. The first rolling lift bridge ever built was the 1895-opened Van Buren Street Bridge (long since replaced by a newer bridge of a non-rolling bascule type) in the city of Chicago and was patented by Scherzer. The second rolling lift bridge constructed spanned the Chicago River between Jackson and Van Buren Streets. These bridge projects were for the Metropolitan West Side Elevated Railroad Company.
The timing of Scherzer's unique design could not have been better. Railroads were being built with bridges needed to cross rivers in dense urban sites. His patented method made it possible for a bridge to accommodate a change of grade.
In 1908 his contribution was recognized:
William Scherzer [was] the inventor and patentee of what is acknowledged to be one of the most useful mechanisms of the generation. [His] invention has been of great benefit in the advancement of commerce and civilization. [Scherzer’s contribution] has facilitated and made possible the opening and development of the great rivers, canals and waterways throughout the world for the passage of the largest vessels of commerce.
1893 Lift bridge patent – Because of Scherzer's early demise, his brother took over the Scherzer Rolling Lift Bridge Company and derived fourteen additional related patents pertaining to rolling lift bridges and built 175 of these type bridges nationwide by 1916.
Scherzer never married. He suffered a year with typhoid fever which brought an attack of brain fever. Scherzer died on July 20, 1893 at the age of thirty-five in Chicago. His father, William Scherzer Senior, died at the age of forty-one.