I spent my teen years living Midland, Michigan (where my parents still reside) and was well-aware of the “tridge” downtown; a bridge with three legs, sometimes known as a “Y-Bridge” or “Tri-Bridge”.
A while back, ‘CuriousJM’ put together a nice post about Tri-Bridges around the world on the Google Earth Community. Along with the list of tri-bridges he also posted this excellent KMZ file to help you find them all. Here’s the list.
Aioi Bridge, Hiroshima, Japan
Bridge with Three Entrances (Ponte das Três Entradas), Portugal
Chu Y Bridge, Ho Chi Minh City, Vietnam
Hama Bridge (Sancha Zijin), Heicheng Village, Hebei, China
Jasenovac Tri-Bridge, Croatia
Louisa/Fort Gay Tri-Bridge (Kentucky/West Virginia), USA
Margaret Bridge (Margit Hid), Budapest, Hungary
Y-Bridge, Zanesville, Ohio, USA
Kikko Bridge, Mie, Japan
The Tridge, Midland, Michigan, USA
The Tridge, Frog Island Park, Ypsilanti, Michigan, USA
Treponti, Comacchio, Italy
Trinity Bridge, Crowland, Lincolnshire, England
Proposed foot Bridge
Hacking Ferry Bridge, near Mitton, Lancashire, UK
Google Earth is a perfect tool to explore items like this, and his list makes it easy to browse around and check them all out.
Nice work, CuriousJM!