Cavanaugh Bay Airport (FAA LID: 66S) is a public use airport located three nautical miles (6 km) north of the central business district of Coolin, in Bonner County, Idaho, United States.

[1] The airport is located on the east side of Priest Lake, at the south end of Cavanaugh Bay.

[2] Cavanaugh Bay Airport covers an area of 25 acres (10 ha) at an elevation of 2,484 feet (757 m) above mean sea level.

It has one runway designated 15/33 with a 3,100 x 120 ft (945 x 37 m) turf surface.

For the 12-month period ending June 7, 2006, the airport had 4,500 general aviation aircraft operations, an average of 375 per month.