Challenging navigation and physical courses at the Yellow Fork event. 41 participants. Weather was cool and clear.

Course Orienteer Time
Yellow Troop 1236 34
Brubaker grp backward 40
Wassom Family 54
Asha Nda 56
Brubaker/Brady group 57
Troop 1660 1:22
Eric Rossiter 1:54
Orange Ian Hoag 1:08
Skidmore group 1:47
Greenfields 1:49
Dan Mcgraw 2:17
Sorensen 2:25
Hamel Boys 2:29
Kump and Stanger 2:37
Green Mac Brubaker 2:55
Red Ian Hoag 1:35
Darin/ Diane Garrett 2:14
Doug Bergman 2:43

This is a new area mapped out by Bob Huebner. The event is planned for Saturday, October 21, 2017. 

Directions to the Yellow Fork location.

Course Event Notes

From Bob Huebner. Posted on 10/16/2017

There are 4 courses: Advance long (red), advance short (green), Intermediate (orange) and advanced beginner (yellow). Colors are the OUSA designation for courses. I set the courses so that all orienteering skills will be needed. Contour reading, compass directions and route choice are skills all will need. This is not an event to move up in difficulty. Normal times should be 60 to 120 minutes for advanced course. Intermediate 45-75 minutes. Advanced beginner 30-60 minutes. This assumes picking the correct course for your ability and fitness.

Courses will open at 10 AM and close at 1:30. Control pick-up will start immediately at 1:30. Registration should be open by 9:30.

The woods and open fields are very runnable.  I used the green colors for the oak and maple areas that are not open forest. I used the green slash symbol for the open cedar forest where visibility (and runnability) is limited. There are rocky and shale areas which have difficult footing to travel down. I changed the courses somewhat to avoid steep downhill routes.

I chose to set an advanced beginner yellow course instead of beginner white course. The main difference in the difficulty is knowing when to look for your control from the trail. The course follows the main canyon trail. The main canyon trail is totally open without side trails. Thus setting a beginner course would have controls in the total open areas. I think everyone will enjoy the Yellow course more.

Course distance and climb:

Red                        6.7Km                   315m

Green                   5.0                          190

Orange                 3.6                          135

Yellow                   2.0                          80

NON- Orienteers in the park.  There are cows throughout the park- open range. This park is heavily used by horsemen. DO NOT run by horses. This is for your and the horses safety. Running by horses will not save you much time and isn’t that important. Be mindful of hikers also.

Controls. I generally hung controls on the nearest tree or bush. There are 4 courses- so check your numbers.

Mapping Notes

The park is a series of forked canyons. There are three major forks. The right handed forks (north) are have more interesting side reentrants. Thus I mapped most of the right forks and only small sections of the left (south) forks. The main canyons south side are very steep with major cliffs. The cliff areas have loose gravel which makes coming down very difficult/dangerous. Thus, the south forks main canyons were not extensively field checked and should not be used for courses. The canyons are dominated by open cedar tree forest and bare land. The bare land is mainly on the wide spurs between the many side canyons. The cedar forest dominates the upper hills. The cedar forest is runnable, but has sections of limited visibility. The forest areas with severely limited visibility is marked with green slash symbol. Yellow Fork stream follows the main canyon. The stream is very deep in sections and marked by the gulley symbol. The stream/gulley area has many small mapped trails for crossing.

Dark Green: Mostly dense scrub oak. The oak dominates the lower canyons. There are small patches throughout the park.

Medium Green: Also scrub oak, but less dense.

Light green: Sections of larger mostly maple trees. Not used for cedar areas.

Open forest: The open runnable forest is mostly the cedar areas. There are some sections of open maple forest. The open forest that is difficult to see through is mapped with green slash. The green slash areas are generally slower running than the open cedar forest.

Clearings: I mapped as “clear” field sections those areas with scattered cedar trees. I used the distinct tree Green Circles to indicate the larger cedar trees in the clearings. The trees are useful for navigation. There are many small clearings. It was difficult to decide between open forest and clearing. But, the mapped smaller clearings are distinct enough to map and they will help in navigation. There are some small sections of scattered trees.

Boulders: I tried to keep mapped boulders to at least waist high. Some large wide boulders but not as high boulders are mapped. When boulders were close to cedars in the fields, I added the distinct tree symbol. The tree may be easier to find than the boulder. Boulders in the thicker forest (especially near the upper hills) could easily be missed. Some spurs are very rocky with many large boulders. Some areas are just gravel or small boulders. This made for interesting mapping. A boulder is defined as exposed rock that is mostly out of the ground. Rocks which are somewhat buried are mapped as cliffs. Many times this was 50-50 decision. Boulder clusters are mapped when many smaller boulders are grouped together and may not meet the single boulder description of waist high or very wide.

Cliffs: Along the side canyons are many long exposed sandstone areas. These cliffs are not very high, maybe less than a meter but obvious. Some of the cliff areas have significant exposed bare shale sections. These are mapped as open rock (grey).

Pits: there are some old (mining?) pits on the map.

Trails: There are many small distinct and indistinct trails in the side canyons. Most are mapped, but not all. Some follow the gulley, but many are up the banks. Most side canyon trails will disappear for large sections. These trails are not useful for navigation and may not be any faster than the open woods.