Fairgrounds relocating due to MCAS accident-potential zone YUMA, Ariz. (KYMA, KECY) - Yuma County is home to some of the nation's greatest amenities: agriculture, tourism, and military bases. What was once a field for growing crops turned into the Yuma County Fairgrounds. The Yuma County Fairgrounds are in a prime accident-potential zone, located just across the Marine Corps Air Station Yuma (MCAS) street. Russell McCloud, Yuma County Supervisor, says it's a risk the county is just not willing to take. "If an aircraft goes down while there’s people there, especially the fair, it just, it’s horrendous," McCloud explained. "I mean, you could imagine."