Airport (FAA LID: U61) is a state-owned public-use airstrip located 22 miles (35 km) northeast of the Central
business district of Ketchum
, a city in Custer
, United States
. Twin Bridges Airport covers an area of 60 acres (24 ha) which contains one runway (3/21) with a turf surface measuring 4,450 x 100 ft (1,356 x 30 m). For the 12-month period ending August 17, 2005, the airport had 800 aircraft operations: 75% general aviation and 25% air taxi. The airport is located close to the Big Lost River
in a narrow Valley
. Approaches to runway 21 must be flown off the extended runway centerline due to a mountain.