The Vantage Bridge carries Interstate 90 across the Columbia River, near Vantage, Washington. This section of the river is named Wanapum Lake; it is the reservoir formed by Wanapum Dam (barely visible where the river disappears). In 1927, the 1640-foot bridge was constructed by requiring workers to enter pressurized Caissons 70 feet under the riverbed via airlocks. Once completed, the bridge had a 70-foot clearance on the center span, allowing for river traffic to pass under the bridge. A scanned medium format negative.