When considering a project to fulfill the requirements for Boy Scouts’ highest award — the Eagle badge — Gabriel Bay envisioned a bridge to the future. Literally.

The 18-year-old member of Troop 90, affiliated with Greenfield Hill Congregational Church, planned an arched stone bridge — something that would withstand the test of time for years to come — spanning a stream in the Connecticut Audubon Society’s Larsen Sanctuary off Burr Street.

The bridge, complete with iron railings, replaces a simple plank bridge that needed to be replaced along a trail through the nature preserve.

After crafting a wooden form to test the bridge design, Bay coordinated a group effort to construct the stone structure. Stonemasons cut the stones to fit the form, he said, and with assistance from his father, Bay spent a day digging holes for the foundations and pouring concrete.

Fellow troop members helped load the stone pieces into pickup trucks and move them to the sanctuary site, and assembled the stones on the form based on pictures and numbers assigned to the pieces. Masons were hired again to build the stone walls on the sides of the bridge, and then the troop pitched in to mix and pour the concrete walkway.

Concrete for the foundations was donated by Mohecan Valley Concrete and the mix for the walkway was donated by Gault Stone, according to Bay.

In addition to helping Bay qualify for his Eagle badge, planning and constructing the bridge should provide a solid foundation for the recent Fairfield Ludlowe High School graduate’s studies in engineering at Carnegie Mellon University this fall.