What are the steps in a creative department from junior graphic designer to the creative director?

Here are the basic career steps:

Junior Designer
Senior Designer
Associate Art Director
Art Director
Senior Art Director
Associate Creative Director
Creative Director
Senior Creative Director

However, this largely depends on the web design or marketing agency you work for. Some creative agencies have more, and many have less. It is determined based on the overall structure of the organization. At Sandstorm Design, our titles include (or have included): Creative Director, Senior Designer, Interactive Designer and Graphic Designer.