1960 Map of Mount Si

About this map

The South Fork Tolt Watershed and the Tolt Seattle Water Supply Res dominate the northern landscape of this survey, highlighting the critical infrastructure supporting Seattle's expansion in the 1960s. To the south, the terrain rises toward the iconic peaks of Mount Si and Mt Teneriffe, marking the transition into the Snoqualmie National Forest. The map documents a period of active resource extraction, evidenced by numerous mining operations like the Lennox Mines and Apex Mine tucked along the ridges of the Cascade foothills.