Hippo Playground at 91st Street.
Park: Hippo Playground, NYC Parks Department website: “The
property that is now Hippo Playground, on 91st Street, was acquired in 1937
as part of the Riverside Park expansion. The site was developed later that
year and was known as the 91st Street Playground.“
- New Deal Assistance in
NYC Parks Department Projects, 1934-43.