Deception Pass looking eastFidalgo Island (Wikipedia)
Fidalgo Island is an island in Skagit County, Washington, located about 60 mi (97 km) north of Seattle. To the east, it is separated from the mainland by the Swinomish Channel, and from Whidbey Island to the south by Deception Pass. The island is named after the Spanish explorer and cartographer Salvador Fidalgo, who explored the area in 1790.In the early years of the 20th century, travelers of the horse-and-buggy era used an unscheduled ferry to cross from Fidalgo Island to Whidbey Island. To call the ferry, they banged a saw with a mallet and then sat back to wait.In the spring of 1792, Joseph Whidbey, master of HMS Discovery and Captain Vancouver’s chief navigator proved that it was not really a small bay as charted by the Spaniards (hence the name “Deception”), but a deep and turbulent channel that connects the Strait of Juan de Fuca with the Saratoga Passage, which separates the mainland from what they believed was a peninsula (actually Fidalgo Island and Whidbey Island).
The only bridge that reaches Whidbey Island is the Deception Pass Bridge, State Route 20, which connects the north end of Whidbey to the mainland via Fidalgo Island.