- Source: Tygh Grade Summit
Tygh Grade Summit (el. 2697 ft.) is a mountain pass in Oregon traversed by U.S. Route 197 and is located about 6.5 miles north of Tygh Valley.
Tygh Grade Summit (el. 2697 ft.) is a mountain pass in Oregon traversed by U.S. Route 197 and is located about 6.5 miles north of Tygh Valley.