This project is called Gravina Access and is actually TWO bridges: from Revillla Island, to Pennock Island, to Gravina Island. Less than 14,000 people live in Ketchikan on Revilla Island. The population of Gravina is less than 50 and there are virtually no roads. There is an airport there that is served by a few-minute ferry ride.
The official "engineer's estimate" is actually $315 Million.
The population of the declining for several years.
On the other hand the bridge will make it easier for the rest to leave.