
Tillamook State Forest covers the northern reaches of this landscape, where the upper Tualatin River and its numerous tributaries cut through a series of prominent landforms like Baseline Ridge and Hagerty Ridge. The presence of Hillsboro Reservoir and Barney Reservoir highlights the area's role in water management for the region. Industrial activity is evidenced by several scattered quarries and borrow pits, alongside a dense network of timber-access routes including the Stimson Mainline Road and Flora Mainline.
41 named features on this map. Tap any name to fly to it.
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2 editions found
1941 · Timber
USGS Topo · 1:62,500
1941 · Gales Creek
USGS Topo · 1:62,500
1941 · Yamhill
USGS Topo · 1:62,500
1942 · Yamhill
USGS Topo · 1:62,500
1942 · Fairdale
USGS Topo · 1:62,500
1948 · Vancouver
USGS Topo · 1:250,000
1950 · Vancouver
USGS Topo · 1:250,000
1950 · Vancouver
USGS Topo · 1:250,000
1955 · Timber
USGS Topo · 1:62,500
1955 · Fairdale
USGS Topo · 1:62,500