Crown casino has re-launched plans for a controversial 90-storey hotel tower on the banks of the Yarra River that would be 20 metres taller than the Eureka Tower.

The $1-billion-plus plan - by the same British architects Crown is using for its Barangaroo tower in Sydney - includes a 41-metre-long "sky bridge" over busy Queens Bridge Street that could face opposition from Melbourne City Council.

The controversial footbridge over Queensbridge Street that Crown has asked the Andrews government to approve.

The previous plan for the sky bridge boasted that it would link its two six-star hotels so that guests could easily cross between them without having to get down to street level.

Melbourne City councillor Stephen Mayne said sky bridges over streets were not permitted under the planning scheme, "although a number of exemptions have been granted over the years".