Stone Avenue Underpass

The Stone Avenue Underpass, known to native Tucsonans as "Lake Elmira", is a historic underpass on Stone Avenue in Tucson, Arizona.The underpass was completed in January 1936. It was added to the National Register of Historic Places in 1988. It is located between 6th street and E. Toole Avenue/W. Franklin Street, and carries two lanes in each direction of Stone Ave under the Union Pacific railroad tracks that run through downtown Tucson.

Due to the poor drainage, it fills fast during heavy downpours of rain because of that was nicknamed Lake Elmira. It was named after 13 year old Elmira Doakes, by Arizona Daily Star reporter Howard Owetly in the summer of 1937.