Conversation so far:
what was snake river canyon in regards to evel knievel ?
The launch took place at the south rim of the Snake River Canyon.
what was the launch of?
Knievel hired subcontractor and aeronautical engineer Doug Malewicki to build him a rocket-powered cycle to jump across the Snake River.
when was the launch?
on Sunday, September 8, 1974, at 3:36 p.m.
MDT.
how many people watched?
so he hired boxing promoter Bob Arum's company, Top Rank Productions, to put the event on closed-circuit television and broadcast to movie theaters.

Question: was the launch successful?
Self-contained rewrite: was the Evel Knievel  launch at snake river successful?