Olallie Scenic Area is a United States Forest Service designated scenic area located in Oregon's Cascade Range. It is between Mount Hood on the north and Mount Jefferson to the south and contains Olallie Lake along with several smaller lakes. The name Olallie is Chinook Jargon for berry. Olallie Lake is open to vehicle traffic June to September. There is no …Olallie Scenic Area is a United States Forest Service designated scenic area located in Oregon's Cascade Range. It is between Mount Hood on the north and Mount Jefferson to the south and contains Olallie Lake along with several smaller lakes. The name Olallie is Chinook Jargon for berry. Olallie Lake is open to vehicle traffic June to September. There is no cellphone service.