City of Lake Saint Louis Public Works Department 307 Parkway Industrial Dr, Lake St Louis, MO63367 What do you do if you find a huge pothole on the road, a fallen traffic sign or even a dead animal on the road? Call the…More LSL Public Works Department. It takes care of things like that. It also offers permits if you are planning on digging/boring in the right-of-way of a city-owned street. There are 17 well trained and dedicated individuals who make up the LSL Public Works Department.