http://www.shannonridgeshowdown.com/index.php  

Course Information
Very hard and hilly course with approximately 50% single track and 50% narrow fire access roads located completely within the Shannon Ridge vineyards. Race loop is 7 miles with approximately 1700 feet of climbing per lap. Climbs and descents through vineyards, spectacular views. Race will start in downtown Clearlake Oaks in front of the Shannon Ridge tasting room and travel 2 miles on flat pavement before turning left onto Morine Ranch road for the climb into the vineyards and to the start of the 7 mile race loop. There will be a “King and Queen” of the Mountain award for the first male and female riders to reach the amphitheatre (880 feet of climbing in 1.5 miles).

Race limit
300 racers

Camping
Fee based - Limited Camping on site available to first 50 registered racers only. “No Camp fires allowed”.

Lights
Lights are required to be on your bike approximately 1 hour before dusk (headlight and tail light are required). Neutral charging station and technical support provided by Nite Rider Technical Lighting Systems.

This looks to be a tough course! Would be cool to race through the vineyards.

Heard that they have Tinker Juarez, Nat Ross, Sue Haywood, Pua Sawicki and Rebecca Rusch confirmed to race. That's both Male & Female 24 Hour World Champs, 24 Hour National Champs and Sue Haywood who has been more XC but was also 2006 24 Hour World Champ.

This is scheduled as the final race of the USA Cycling National Ultra Endurance race calendar.  Should be a real shootout!