The largest park in the South Bronx has an Olmstedian terrain of hills, outcroppings, fields and woods. What is missing at St. Mary’s Park is a water feature. Considering the park’s age (1888) and size (35 acres), the question is raised whether it had a pond in the past.
The 1934 Praeger aerial survey of the park from the Municipal Archives, shows a ridge running down its midpoint and gentle slopes on either side. The park was about to be transformed by Robert Moses who added playgrounds and sports fields to it. But then there is the flat area on its western side, at St. Ann’s Avenue and E. 147th Street.
Hidden Waters blog 