I met Mr. Knievel in the early/mid 70s... at a dragstrip in Enis, TX... he had his outfit (white leathers and I think he had a cape too) on and did wheelies on his Harley-Davidson (I'll never forget how loud it was). At the meet and greet afterwards... the room had renderings of his future attempt at "jumping" the Snake River.
R.I.P. Mr. Knievel... you'll always be the man.
It would have been Green Valley Raceway in NE Fort Worth. Place in Ennis was built in the mid 80's.