Mount. Hood

USA / Oregon / Parkdale /
 mountain, volcano
An active stratovolcano 11,240 ft (3426 m) high in northern Oregon popular with mountain climbers, skiers, hikers, and other outdoor recreationalists, it forms a prominent skyline in Portland. Though minor emissions continued for a century, the last major eruptive period in the late 1700's produced the Crater Rock lava dome and pyroclastic flows and lahars (mudflows). This "Old Maid Eruption" sent lahars into White River Canyon and, most notably, down the Sandy River to Old Maid Flat. Lewis and Clark made note of the very obvious remnants of the volcanic sediment at the mouth of the Sandy River (their "Quicksand River') in 1805.

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Wikipedia article: http://en.wikipedia.org/wiki/Mt._Hood
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Coordinates:   45°22'23"N   121°41'38"W