MetroLink Cross County

Technical Description:

• Span: 31 ft - 6 in
• Rise: 10 ft - 10 in
• Length: 5,500 ft

McCarthy Building Companies installed the longest CON/SPAN^® tunnel to date as part of the MetroLink Cross County Extension project in St. Louis, Missouri.

The 8-mile, 9-station extension to the light transit line is one of the largest publicly funded projects ever undertaken in the city’s history. This extension connects additional communities in the MetroLink system and plans to accommodate an additional 18,000 daily riders.

The precast tunnel portion of the project is designed with a custom shape and encompasses over 5,500 linear feet of CON/SPAN with a 31 ft - 6 in span and 10 ft - 10 in rise. The arch shape was designed to provide an economical solution that would meet the clearance diagram and load requirements of this site more efficiently.

Technical Description:

• Span: 31 ft - 6 in
• Rise: 10 ft - 10 in
• Length: 5,500 ft