Spring Side is a historic residence located just outside of Bellevue, Iowa, United States. The house was influenced by the Gothic Revival "cottage" popularized by A.J. Davis and A.J. Downing. It is sited on a hillside overlooking a valley and the Mississippi River. The property is the source for three springs, hence its name from 1867. Constructed in 1848 for William T. Wynkoop, a local businessman, the 2½-story stone building features steeply pitched gables trimmed with wooden scroll-work vergeboard and pendants with finials, and a gabled tower with the same decorative elements and lancet arch windows. Native limestone is its primary construction material. The house originally had a wraparound porch that was removed. It was listed on the National Register of Historic Places in 1990.