Joint Base Lewis-McChord: I-5 @ MP 119.7: Idaho Ave

3 47.10°, -122.61° N
About location

Built around two long-standing military posts, Joint Base Lewis-McChord grew into a major U.S. military installation in Washington’s Puget Sound lowlands. Created in 2010 from Fort Lewis and McChord Air Force Base, the joint base occupies a broad area south of Tacoma, where Interstate 5 forms a principal north–south corridor. Fort Lewis was established in 1917, while McChord Field began in 1930; their consolidation brought Army and Air Force missions under one installation. Forested training lands, airfield infrastructure and developed facilities give the area a distinct character from the surrounding suburban communities. The base remains an important part of the South Sound’s military and transport landscape.

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