1980 Map of Bridgeport

Broad terraces like Brewster Flat and Snider Flat define the upper elevations, while the river's path is carved through sediment-rich areas like Cassimer Bar and Washburn Island. The map records an era of established water management and recreation, with numerous pumping stations and the Bridgeport Bar State Wildlife Recreation Area flanking the Pateros Lake reservoir. Local landmarks such as Castle Rock and Devils Head provide distinct vertical relief against the irrigation-focused agriculture of the plains.