[akdavis]

I would guess that the areas where motor roads cross bodies of water here are causeways rather than bridges. Also, see note at bottom left about causeway/ferry to Koror Island (which can be seen on following map).



The causeway/ferry between Koror and Babelthuap can be seen illustrated here. Causeways between Koror Island and Arakabesan and Malakal Islands can also be seen. The Koror-Malakal causeway incorporates a short bridge over the Lebugol Channel, which you will be able to see in the following photograph. (These two maps are from "Pacific Islands" [Geographical Handbook Series]. Great Britain. Admiralty. Naval Intelligence Division, 1943-1945.)



Under the right wing tip of the B-24 can be seen a pier from Koror Island to the Lebugol Channel and below that the causeway with bridge from Koror to Malakal Island.

Peleliu also had a causeway that figured prominently in the battle for the island. The causeway connected Peleliu to Ngesebus Island, as can be seen here: