The Springfield Damn is a hydroelectric dam in Springfield. Cecil Terwilliger was in charge of its construction. However, he stole the money for the cement and planned to blow it up, with Sideshow Bob, Bart and Lisa inside. He was arrested, but the dam was too weak so it was later destroyed. However, the giant water wave did not cause any damage.

Non-canon appearances

Ssi 5 The contents of this article or section are considered to be non-canon and therefore may not have actually happened/existed.
Spring dam

Homer driving across Springfield Damn in "The Simpsons Road Rage"

In "The Simpsons: Hit and Run" and "The Simpsons Road Rage", the dam is under construction and there is an incomplete bridge next to it. (The Dam was revealed to have been re-built in 'Road Rages instuction books).