Dallas - From a distance, it looks like any other construction project. But up close the size and scale of the Margaret Hunt Hill Bridge is an impressive sight. "This forms the base, I believe it's 20 feet around," says TxDot spokesman Tony Hartzel.

He says the giant footings will support huge steel cylinders that once connected will soar 450 feet into the sky to form an arch.

The arrival of the steel is a significant milestone for the project which still faces some road blocks. The U.S. Corps of Engineers has prohibited the state from working on some sections of the bridges approaches.

"We are working in areas where we can and a lot of work still going on," said Hartzel. The Corps wants to make sure the project wont impact the levees which might need to be reinforced with concrete.

"Every big public works project has problems and difficulties," said Gail Thomas with The Trinity Trust. The group raised private funds to pay for the design of the Calatrava Bridge. "Were solving this issue about the levees even as we speak," said Thomas.

The state is collecting data and putting together a report to submit to the corps of engineers. Hartzel says the issue with the permits has yet to delay the project which is scheduled to be complete in late 2011.