Eight months after announcing a half-billion dollar commitment for five new green bridges across the city, Brisbane City Council is still establishing the total expected cost.

Only one bridge, the Kangaroo Point pedestrian bridge linking the point to the City Botanic Gardens, has an estimated costing of $190 million thanks to a business case recently finalised.

Artist impression of a proposed Kangaroo Point pedestrian bridge between Thornton St and Edward St. Credit:Richard Kirk Architect

If built, two West End bridges - one from Toowong to West End and the other from St Lucia to West End - would be for pedestrians and cyclists.

A pedestrian and cycle bridge connecting Kingsford Smith Drive Riverwalk into the existing riverwalk network would be constructed at Breakfast Creek.