Mount Thomson, Washington

Prominence: 1514 ft, 462 m

Elevation: 6554 feet, 1998 meters

True Isolation: 2.08 mi, 3.35 km
Elevation Info:NAVD88 Elevation: 6558 ft / 1999 m
Alternate Name(s)Mount Thompson
Latitude/Longitude (WGS84)47° 28' 20'' N, 121° 21' 39'' W
47.472323, -121.360711 (Dec Deg)
623524 E 5258956 N, Zone 10 (UTM)
CountryUnited States
County/Second Level RegionKing

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Lists that contain Mount Thomson:
     Alpine Lakes "Home Court" Top 100 (Rank #18)
     Mountaineers Snoqualmie Peak Pin-All (Rank #2)
     Smoot's "Climbing Washington's Mountains" 100 Peaks (Rank #77)
     Mountaineers Snoqualmie Peak Pin-First Ten (Rank #1)

Selected Guidebook(s) for this Peak:
       Climbing Washingtons Mountains (Smoot)
       Cascade Alpine Guide, Vol. 1 (Beckey)

Selected Trip Reports from this site:
     1990-09-22 by John Anholm
     1999-08-12 by Austin Smith
     2009-07-28 by Davin Jaggard (Unsuccessful)
     2010-08-29 by Chad Painter (Unsuccessful)
     2010-09-25 by Joshua Ricardi
     2012-07-28 by Stephen Smoots
     2012-08-14 by Adam Walker
     2012-09-08 by Sean Albert
     2012-09-09 by Chad Painter (GPS Track)
     2014-06-22 by Sean Mathias (Unsuccessful)
     2014-07-05 by Evan Battaglia
     2014-07-18 by Eric J. Johnson
     2014-08-28 by Susan Shih
     2015-08-08 by Jason Curtis (GPS Track)
     2015-08-23 by Sonja Serwold
     2015-08-23 by Sean Mathias
     2015-09-13 by Ryan Trumbo (Unsuccessful)
     2015-09-27 by Chad Straub (GPS Track)
     2016-08-21 by Andreas W
     2016-08-26 by Sam Wilson (GPS Track)

View ascents of peak by registered members (95 total)

Nearby Peak Searches:
     Radius Search - Nearest Peaks to Mount Thomson
     Elevation Ladder from Mount Thomson
     Prominence Ladder from Mount Thomson

Thomson is one of the most precipitous and pointy peaks near Snoqualmie Pass, and its Matterhorn-like form is a landmark from nearby summits. It is a long hike in from I-90 to its base, and the climb is sustained class-3 scrambling by its easiest route.

This peak is very often spelled "Mount Thompson", by the Montaineers, Beckey, and others, but it is named after famed Seattle municipal engineer R.H. Thomson, and the new USGS 7.5 minute map correctly spells his name.

Click on photo for original larger-size version.
Looking down Mount Thomson's West Ridge, from the belay station at the end of the slabs on pitch 3 (2015-08-08). Photo by Jason Curtis.
Click here for larger-size photo.
Web Map LinksAcme Mapper   MyTopo   Gmap4   TopoQuest
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ProminenceKey Col Page  (Detailed prominence information)
  Clean Prominence: 1514 ft/462 m
  Optimistic Prominence: 1554 ft/474 m
  Key Col: 5040 ft/1536 m
Isolation2.08 mi/3.35 km
Nearest Higher Neighbor in the PBC database:
    Chikamin Peak  (E)
Isolation Limit Point: 47° 28' 45'' N, 121° 19' 3'' W
    ILP Map Links:
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RangesContinent: North America
Range2: Pacific Ranges
Range3: Cascade Range
Range4: South Washington Cascades
Range5: Alpine Lakes Area
Range6: Snoqualmie Pass North (Highest Point)
Drainage BasinsSnohomish
Puget Sound
Pacific Ocean
OwnershipLand: Mount Baker-Snoqualmie National Forest
Wilderness/Special Area: Alpine Lakes Wilderness Area
Topo MapChikamin Peak O47121d3 1:24,000
Data Source1:25,000 (or larger) Topographic Survey Map
Google Maps Dynamic Map

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