Schwengel had founded the Capitol Historical Society in 1962, and continued to serve as its president after his defeat, until 1993.
He also was a founder and president of the Republican Heritage Foundation.

Schwengel received the first JM Dawson Award from the Baptist Joint Committee for Religious Liberty in 1986 for, among other things, his stance against school prayer in 1970 that eventually led to his defeat from Congress.

His collegiate fraternity, Phi Sigma Epsilon, participated in a merger with Phi Sigma Kappa in 1985.
At the onset, Schwengel was strongly supportive of this merger, and influential in the decision as a much-loved past president and ritual author for Phi Sigma Epsilon.
At its completion, Schwengel agreed to serve as an Historian for the combined fraternity and as a trustee of the PSK Foundation.

Schwengel died on April 1, 1993, in Arlington, Virginia.
The Interstate 80 bridge crossing the Mississippi River near Davenport, Iowa is named in his honor.
Schwengel had founded the Capitol Historical Society in 1962, and continued to serve as its president after his defeat, until 1993. He also was a founder and president of the Republican Heritage Foundation.
Schwengel received the first JM Dawson Award from the Baptist Joint Committee for Religious Liberty in 1986 for, among other things, his stance against school prayer in 1970 that eventually led to his defeat from Congress.
His collegiate fraternity, Phi Sigma Epsilon, participated in a merger with Phi Sigma Kappa in 1985. At the onset, Schwengel was strongly supportive of this merger, and influential in the decision as a much-loved past president and ritual author for Phi Sigma Epsilon. At its completion, Schwengel agreed to serve as an Historian for the combined fraternity and as a trustee of the PSK Foundation.
Schwengel died on April 1, 1993, in Arlington, Virginia. The Interstate 80 bridge crossing the Mississippi River near Davenport, Iowa is named in his honor.
Fred Schwengel