II. GRAVITY STRUCTURES 

 1. Chesapeake Bay Bridge Tunnel, Portal Islands, Cape Henry— Cape Charles, Virginia. 



Figure 1. Aerial oblique view of Portal Island No. 1 from northwest. 



a. Construction. 



(1) Completed. April 1964. 



(2) Type. Fill-type artificial islands protected by riprap armor stone weighing up to 

 20 tons (Fig. 1). 



(3) Purpose. Transition structures between bridge trestle and tunnels. 



b. Owner. Chesapeake Bay Bridge and Tunnel District, P.O. Box 111, Cape Charles, 

 Virginia 23310. 



c. Location (approximate). Mouth of Chesapeake Bay. 



Latitude: 36°00'N. - Longitude: IG^Oe'W. 



d. Physical Environment (Fig. 2). 



(1) Protected Ocean-Estuarine Environment. The islands are protected from the 

 northeast and south by the mainland and exposed to the Atlantic Ocean to the east. 

 Exposed to waves generated within Chesapeake Bay by northerly winds. 



