Mount Si, Washington

Prominence: 247 ft, 75 m

Elevation: 4167 feet, 1270 meters

Approx. Isolation: 0.84 mi, 1.35 km
Elevation Info:NAVD88 Elevation: 4171 ft / 1271 m
Alternate Name(s)Kelbts
Highest SummitHaystack
Peak TypeFamous Peak, but not High Point
Latitude/Longitude (WGS84)47° 30' 28'' N; 121° 44' 24'' W
47.507817, -121.739877 (Dec Deg)
594889E 5262368N Zone 10 (UTM)
CountryUnited States
County/Second Level RegionKing

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Lists that contain Mount Si:
     Famous Peaks that are not High Points (Rank #17)
     Mountaineers Everett Lookout Peaks (Rank #20)
     Smoot's "Climbing Washington's Mountains" 100 Peaks (Rank #100)
     Most Ascended Peaks (Rank #22)
     Peaks with Most Page Views on Site (Rank #28)
     Peaks with most Unsuccessful Attempts (Rank #22)

Selected Guidebook(s) for this Peak:
       Climbing Washingtons Mountains (Smoot)

Selected Trip Reports from this site:
     1997-04-22 by Greg Slayden
     2002-09-08 by Duane Poslusny
     2007-04-01 by Erik Landahl
     2008-04-20 by Darren Keegan
     2008-05-09 by Trey Pinkerton
     2008-05-13 by Trey Pinkerton
     2008-08-09 by ChadL Painter (GPS Track)
     2009-01-17 by Trey Pinkerton
     2009-04-03 by Steven Kutsch
     2010-06-27 by James Kaufman
     2011-02-26 by Aaron Nash
     2011-03-23 by Dave Cronkright
     2011-03-24 by Chad Straub (Unsuccessful)
     2011-10-16 by Noel Howe
     2011-10-16 by Sean Albert
     2012-05-15 by Richard Hensley
     2012-11-11 by Vineeth Madhusudanan (GPS Track)
     2012-12-22 by Sean Albert
     2013-01-19 by Chad Straub
     2013-01-23 by Chad Straub (Unsuccessful)
     2013-07-25 by Isaac Heckman
     2013-10-29 by Monty VanderBilt (GPS Track)
     2014-01-03 by Josh Randow (GPS Track)
     2014-01-26 by Josh Randow (GPS Track)
     2014-07-05 by Curtis Stock
     2014-07-22 by Walter Blume (GPS Track)

View ascents of peak by registered members (673 total)

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

Mount Si is a well known landmark and a very popular hiking destination, located in the Cascade foothills just east of Seattle. The mountain looms over the town of North Bend, its steep west face rising thousands of feet to craggy pinnacles. As the first high, jagged summit a traveler sees while heading east on I-90, it is an integral part of the rampart that the Cascade Range presents to the Puget Sound area.

A well-graded trail climbs about 3300 vertical feet (from 600 to 3900 feet) in 4 miles to just below the summit "haystack". This is an extremely popular and crowded trail, with estimates of 80,000 - 100,000 users per year, an average of 250 per day (obviously higher than that on sunny summer weekends). Fortunately, a 1993 reconstruction of the trail by the state allows it to handle the load quite well. The ascent is continuously steep and almost entirely in deep forest, with few views between the trees. But near the top, just below the haystack, rocky crags provide spectacular vistas westward over North Bend and the Snoqualmie Valley to Seattle skyscrapers, Puget Sound, and the Olympic Mountains.

Many hikers scramble up the haystack to the very summit, an exposed, hands-needed semi-climb that is not for the acrophobic. The thousands that regularly ply this route have already dislodged all the rotten or loose rock long ago, leaving a nice staircase with good handholds. Still, people have been killed in falls on this short pitch, so be very cautious and don't try it in any kind of bad weather. The view is not too much better at the end of this 200-foot scramble.

In strict topographic terms, Mount Si is not very prominent at all, despite its very impressive west face. To the east, a high, wooded saddle connects Mount Si to an unnamed 4560 peak that is almost 400 feet higher than its famous satellite summit, and beyond that the ridge runs to higher peaks like Mount Teneriffe, Green Mountain, and other forested bumps of little renown.

Mount Si was named for Josiah "Uncle Si" Merritt, an early local settler. It is pronounced "Mount Sigh", just like the middle syllable of "Josiah".

Google Maps Dynamic Map

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ProminenceKey Col Page  (Detailed prominence information)
  Clean Prominence: 247 ft/75 m
  Optimistic Prominence: 287 ft/87 m
  Key Col: 3920 ft/1195 m
Isolation0.84 mi/1.35 km
Nearest Higher Neighbor in the PBC database:
    Blowdown Mountain  (ENE)
Isolation distance is based on NHN and is slightly overstated.
RangesContinent: North America
Range2: Pacific Ranges
Range3: Cascade Range
Range4: South Washington Cascades
Range5: Alpine Lakes Area
Range6: North-Middle Forks Snoqualmie
Drainage BasinsSnohomish
Puget Sound
Pacific Ocean
OwnershipLand: Washington State Department of Natural Resources
Topo MapMount Si O47121e6 1:24,000
Route #1 Maintained Hiking Trail: Mount Si Trail
Trailhead: Mt. Si Trailhead 660 ft/201 m
Vertical Gain: 3507 ft/1069 m
Distance (one way): 4 mi/6.44 km

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