City Hall is not even close to being back to normal six weeks after floodwaters brought widespread devastation to Calgary and other communities around southern Alberta.

The city says up to 12 feet of water had entered various parts of the municipal complex downtown just one day after the Bow River began to spill its banks, with the majority of water coming up through the ground and sewage system.

Furniture, appliances and debris were found floating in the basement of the administration building.

Most of the roughly 2,000 employees are still not able to work there, with 1,300 of them currently working from home or other temporary offices.

Three large generators are currently powering the building after flooding destroyed the many of the mechanical, electrical and IT systems.

The city says the plan is to have most people back in the buildings by early September, but it's the nearby parkade that has officials worried.

"We got a structural engineer to make sure that it was safe ... and then we had a team of electrical, mechanical and structural engineers in here — and lighting designers — to go through the entire parkade and figure out what has to be replaced," said Dean Bell with the Calgary Parking Authority.

"That was pretty easy though — everything has to be replaced."

The damage to the municipal complex is currently estimated to cost $25 million to repair.

The parkade, which officials hope to have open by December, is expected to cost $4 million alone.