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Zer-O Series - Old Maid Flat


This Zero-O training features an advanced training course at Old Maid Flat, off Hwy 26, near Welches on Mt Hood National Forest.

Course Notes
We do not have many opportunities to practice open forest orienteering relatively close to Portland. At Old Maid Flat, we will have one advanced course, a Green Middle course, using small flags. This will be technical and challenging. Compass bearings and pace counting will be important. Terrain is essentially all white forest, with lichen and moss-covered sand and rocks. This is a good opportunity for intermediate orienteers to try an
advanced course. The course is about 5 km with 50 m climb. Map scale is 1:10,000 with 10 foot contours.

Bring water (and food). Although the campgrounds are closed, the pit toilets are open. My understanding is that we do not need NW forest passes yet. We are close to wilderness areas, and you may want to hike in wilderness after the course. I understand wilderness passes are not yet needed. 



Starts will be open from 11:00 to noon. Late comers are welcome but control pick up will begin about 20 to 30 minutes after the last start or 11:00, whichever comes first.


Where to Meet

Directions and Meeting Place
Take Highway 26 east past Welches. Turn left onto E. Lolo Pass Road. After about 4 miles, turn right onto Muddy Fork Road / NF-1825. A little over 0.5 mile later, turn right across the Sandy River into Old Maid Flat. After about 0.5 mile, turn right on NF-382 at the sign to Riley Horse Camp. You will shortly cross a creek, and then bear left past the closed campground. There is some parking available at a wide spot before the road starts to
climb. Carpooling is a good idea. Also, if anybody would like to go up a couple of hours early, I would like to carpool, too.



Cost: No charge!



Please RSVP to the meet director at the email below by 6pm the day prior to this event so that we have a map for you. If you do not RSVP, you can't promise you'll get a map.


Meet Director

Mike Poulsen  Mike.Poulsen at


About the Zer-O Series

On all "Zer-O" dates (10th, 20th, 30th of the month) from April through September, CROC offers training courses - some with added training exercises - in different Portland area parks. These are informal events, with no fees, no timing and no results posted.

For questions about the Zer-O series, or if you'd like to host an event , please contact Scott Drumm


Embedded Google map of event location goes here.

Later Event: May 10
Zer-O Series - Gabriel Park