Here is a pic of the flyer.
The CJ BMX website says since 1981, but this shows it was open in 1980. I know my mom took me to a race there in 1979. So it dates back at least to 1979. Well maybe in 79 she took me there to look at a bike or something. Seems kinda far and I dont remember buying a bike from them. I know where I got each bike from. My mom only took me to races in 78 & 79. In 1980 she was gravely ill and would pass away before the date on this flyer. (Mom thanks for everything)
Now in 79 I raced mostly NBL with some ABA. I can not remember ever racing NBA or earning a NBA plate. (I did race my first race ever at a NBA track, but didnt join the NBA and raced as a non-member, i had no idea what anything was at that time)
So in 1979 I can therefore conclude the track must have been NBL. Or the races I attended were non-sanctioned. I know I got my picture in a BMX Newspaper from that track ( I raced Howell a few times).