The Rise of the Ultra MTB Races

While it is very early in the new year, I think we are starting to see a clear trend for 2007 MTB racing: the rise of ultra marathon and stage races. Just this year, we have the following 100 mile plus races on the schedule:

• Durango MTB 100: The Durango, Colorado MTB 100 begins at the base of Durango Mountain Resort and climbs to a summit of 11,500 feet in elevation in the San Juan Mountains. Riders can choose three courses; the 100 mile, the 100 kilometer course or the 50k course.
• The National Ultra Endurance Race Series: Comprising of a seven 100+ mile races ( Cohutta April 21, Mohican June 2, Lumberjack June 16, Breckenridge July 21, Wilderness August 4, Endurance Aug 25, Shenandoah Sept 2), this series looks to crown the ultra endurance MTB racer. Most of the races are throughout the midwest.
• The Endurance 100 also has there own series of endurance races, with a stage race at the end.
• Leadville 100: Although Lance and Floyd might not be going head to head, you can still try and get into Colorado's toughest ultra MTB race.
  
• The Trans-Iowa III: Covered here before, but a race across Iowa.
  
• The Seven: A classic (but pricey) seven stage race from Victoria to Whistler, British Columbia.
  
• The Cascade Creampuff: One hundred miles with 18,000 feet of climbing through the Cascade Mountains near Wilmette Pass, Oregon.
  

I am sure I am missing some. Anyone know of any 50+ mile races here in NorCal ?