Twin Bridges Airport (FAA LID: 7S1) is a public use airport located two nautical miles (4 km) southeast of the central business district of Twin Bridges, a town in Madison County, Montana, United States.

It is owned by Madison County and the Town of Twin Bridges.

[2] Twin Bridges Airport covers an area of 364 acres (147 ha) at an elevation of 4,777 feet (1,456 m) above mean sea level.

[1] For the 12-month period ending September 16, 2009, the airport had 2,650 aircraft operations, an average of 220 per month: 98% general aviation and 2% air taxi.

At that time there were 10 aircraft based at this airport: 80% single-engine, 10% multi-engine, and 10% ultralight.