Little information is available at the moment regarding topos etc, especially as Sharka's site isn't active (see internet archive)
For now, from Aidan's guide until more is released:
The main zones in the Muir Creek area are the Lower Lost World, Upper Lost World, and Sasquatch City. The Lost world sectors are river bouldering zones similar to the Jordan River sectors and Sasquatch City is the forest sector adjacent to upper Lost World. Development of the area began in the Lost world zones around the same time as the development of the Jordan River areas (c.2007?) Sasquatch City is a collection of basalt boulders located in the forest above the Upper Lost World River Sector. The area was discovered and developed by Sharka and James starting in 2019. Though the rock is quite friable especially before cleaning, the featured rock makes for phenomenal boulder problems once the rock has exfoliated. There are tons of easy and moderate lines established, and a growing list of harder problems as well. Much of the rock dries very quickly so it is a great option during the rainy winter months. Due to the nature of the rock and the long approach, the objective hazard of this area is much more significant than others closer to town. Take extra care to pad and spot well since a bad fall could mean a gruelling crawl out.
Directions: Park just off Anderson Rd at (48°23'12.5"N 123°51'33.4"W) on a dirt road with a yellow gate. Hike past the gate and curve right. Stay left at a fork about 200m in and then stay left again where another past joins. You’ll then stay straight on a mostly flat logging road for 1.5km until you get to a spot where you can curve back hard left and down a hill into a clear cut. Coordinates: (48°24'15.0"N 123°52'11.2"W). Follow this road back south about 500 meters past a big boulder with a crack in it on the right. Now watch for a small cairn and overgrow trail that leads downhill to your right towards some boulders on the edge of the forest. If you find the best trail you should end up at Elfhabet and Red Light Was my Mind
Coordinates: (48°23'58.4"N 123°52'18.0"W)
Typically there are garden shears and a saw under Red Light Was my Mind. Do your part and help clean the trails when you go, as it overgrows quite quickly. The whole hike is just under 3km, with the bulk of it being on a very flat logging road. You can do all but a couple short sections with a mountain bike, so if you have one this is a great option to cut down on the approach time. There is an alternate approach that is available when the river is low that approaches from the west side of the river that makes the walking distance substantially shorter though it is steeper and involves some rock hopping or wading to cross the river. To access from this side park just off Highway 14 at (48°23'43.7"N 123°52'43.0"W))...
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