Photo gallery image (click to enlarge)

Shell Ridge Open Space

Date: (Sat.) May. 20, 2006
Location: Walnut Creek, CA
Event Directors: - 707.557.6251, - 925.926.0853
Course Setters: François Léonard, Marie-Josée Parayre
Type: B; Standard White through Blue courses; BAOC Annual General Meeting & Officer Elections

Note: The BAOC annual general meeting and officer elections will be held at this event.

This will be a standard event with the full range of courses offered. The standard schedule ( for registration, starts and course closure will be followed. E-punch will be used for all courses. Maps are 1:10000. Poison oak prevalence in the park is low, but if you are very sensitive, please take precautions. A portable toilet will be available near the registration area.

This year, I am trying to use a scarcely used portion of the map for part of the courses. All advanced courses will visit this area, although on the shorter courses it will only be for a short section. To access this area and have courses of manageable length and climb, we will have a remote start 750m from the assembly area. (It takes about 10 minutes of walking to get there).

As usual at Shell ridge, we have been instructed by the park ranger NOT to climb over or crawl under fences. Hence, crossing a fence without using a gate will be an automatic disqualification. All advanced courses have mandatory crossing points at gates. The location of the gate will be indicated on the map and on the clue sheet by the mandatory crossing symbol, and the segments that join controls for these legs bend through the crossing. Control bags will NOT be located at the gates.

This year I have made extensive map corrections, particularly in the new section. However, the starting map was lacking so much in detail that I have only been able to add a fraction of the detail. Your input on the corrections is appreciated.


You may print and fill out an entry form ( in advance if you wish, which may save time if you are bringing a large group. (PDF files are viewable with the free Adobe Acrobat Reader (

Course Statistics

Course Length Climb Navigational Challenge
White 2.5 km 105 m Beginner
Yellow 3.1 km 160 m Advanced Beginner
Orange 3.9 km 190 m Intermediate
Brown 3.6 km 165 m Advanced
Green 4.4 km 310 m Advanced
Red 5.3 km 355 m Advanced
Blue 6.3 km 390 m Advanced


Anyone interested in volunteering for this event, please contact the Event Director. We still need someone to do clinics.

Driving Directions

From I-680 in Walnut Creek, exit onto Ygnacio Valley Road, and head east approximately 2.3 miles to Walnut Avenue (NOT Walnut Boulevard). Turn right on Walnut Avenue, and go 1.5 miles to Oak Grove. Turn right onto Oak Grove, and immediately veer right onto Castle Rock Road. Northgate High School is on the right about 0.5 miles along Castle Rock Road. Park in the school lot closest to the hills, past the buildings. Registration and starts will be about a ten-minute walk from the lot along Castle Rock Road, right on Comistas Drive, and left on Hanna Grove Trail.