DENNING
KEENESBURG, CO
CO04 represents Denning, a privately owned, non-towered airport serving Keenesburg, Colorado. Its single runway, 17/35, is a gravel strip 863 feet long and 35 feet wide.
The field has no published instrument approaches and is flown under visual flight rules. Pilots self-coordinate traffic under standard see-and-avoid procedures with no control tower present. There is no fuel service on record here, and because the field is private use, prior permission from the owner is required to operate there.
The airport sits at 4,977 feet above mean sea level. At that elevation, density altitude is a routine consideration in warm weather.