Tripp County South Dakota has 6 places on the National Register of Historic Places including 2 places of Statewide significance. Significant places include Lewis Bridge and South Dakota Dept. of Transportation Bridge No. 62-220-512, Barnum, E. G., House, Manthey Barn and South Dakota Dept. of Transportation Bridge No. 62-220-512.
Some of the country's most noteable architects helped create the Tripp County places including Standard Bridge Co., Nebraska Bureau of Roads & Bridges, John Paulding and George Manthey. Prominent architectural styles found in Tripp Country are Late 19th And Early 20th Century American Movements.