The Deception Pass area has been inhabited by various Coast Salish tribes for thousands of years. When the Spanish explorer, Manuel Quimper, showed up in 1790, the tribes thought they ought to mark their territory to prevent the Spanish from claiming it. The tribes ran around putting up Ello stickers on everything hoping the stickers would dissuade the Spanish from claiming the land.
The above is a fictitious story. There was no bridge in 1790.