Below is the Google map to the air field at  Morrison-Rockwood State Park 

Rockwood Field is in Rockwood State Park, just north of Morrison Illinois. You can find driving information with the links above.If you plug directions or GPS coordinates into MapQuest, or similar online tools, one might find that these tools take you to a gravel road north of the park.
This is not correct!!!!
You should not travel on any gravel roads to get to or enter the park!!!!! 
From State Highway 78, you should use Damen Road, then the entrance to the park is on Crosby Road. There will be small signs posted on these entry roadways onthe days of the events.