Road Atlas of Oregon published by Benchmark. This atlas provides 112 pages of detailed maps and includes highways of the Northwestern US and Oregon (Hwy 20, I5, I84), Recreation and Public Lands Detail, Highly Detailed Landscape Maps (scale 1 : 225,000). Index of counties, cities, parks, mountains, lakes & rivers. Detailed Portland Metro Map is also included at scale 1 : 125,000. GPS Grid.