Heyburn State Park Sign ID: 495 | This file appears in: Senator Heyburn and the Northwest's First State Park The exit sign for Heyburn State park, taken in 1935. | Source: Heyburn State Park Entrance Sign, 1935, Digital Collection: Idaho Civilian Conservation Corps. https://digital.lib.uidaho.edu/cdm/singleitem/collection/cccidaho/id/27/rec/5 Download Original File SourceHeyburn State Park Entrance Sign, 1935, Digital Collection: Idaho Civilian Conservation Corps. https://digital.lib.uidaho.edu/cdm/singleitem/collection/cccidaho/id/27/rec/5 "Heyburn State Park Sign" appears in: Senator Heyburn and the Northwest's First State Park