Golden Gate Bridge fans hoping to get a behind-the-scenes tour of the historic span won’t receive that thrill anytime soon—and likely ever.

In November, the Golden Gate Bridge District issued request for proposals to private companies interested in providing an “interactive experience” on the span, with early ideas including guided catwalk climbs and tours of the bridge’s interior. Slated to start in 2013, and modeled after a similar program on the Sydney Harbor Bridge in Australia, the program was expected to generate $9 million annually for the struggling bridge district, which is facing a five-year projected shortfall of $132 million.