Facts 

Overview
Tunnel under Rocky Butte on Rocky Butte Road in Portland
Location
Clackamas County, Oregon
Status
Open to traffic
History
Built 1939
Design
Tunnel
Dimensions
Total length: 400.0 ft.
Inventory number
BH 29885 (Bridgehunter.com ID)

Categories 

Built 1939 (348)
Built during 1930s (5,105)
Clackamas County, Oregon (48)
Open (21,539)
Oregon (370)
Total length 250-500 feet (2,074)
Tunnel (253)

Comments 

Rocky Butte Tunnel
Posted February 15, 2008, by D.E. Thomas (dethomas01 [at] yahoo [dot] com)

Rocky Butte Tunnel is not in Clackamas County. It is in Multnomah County. I doubt that it is 400 ft. long, either.