Whilst this route can be done in either direction, this description describes it in a clock wise direction from the road, to Mt Cayoosh, to the Marriott Basin, and back to the road.
The Duffy Lake Road descends from Cayoosh Pass to a bridge crossing Cayoosh Creek. A half km before the bridge there is space on the South side of the road to park a half dozen cars. Park here, and cross the road where a logging road heads up right, following north above the western banks of Cayoosh Creek.
After a brief climb take the right fork in the road. Pass through a treed section of a couple of kilometers until the road ends below a clearcut. Follow the tree line another 2 or 3 hundred meters until a vague line through the trees can be followed north. Cross an overgrown avalanche path and head back into the trees veering right towards the creek. At some point before the headwall blocks your way, find a place to negotiate the creek. There are the occasional orange painted tin markers on trees on the far bank, but these should not be relied on.
Once across, stay close to the east bank of the creek, climbing gently up a steepening valley until you reach a lake below a hanging glacier. From here, a small climb NE over a shoulder lets you drop down to a lake at the headwaters of Seven Mile Creek. NE of the lake, a long, often corniced, ridge line between two sub-peaks off the south ridge of Mount Marriott can be reached by climbing a long open slope. Often a break in the cornice can be found at the northern end of the ridge. Descend the eastern slope on the other side, staying left above a small creek. Before dropping down to the trees, continue a small way north until you can see the Wendy Thompson Cabin, a waterhole and good camping.
From here the trail follows the return route for the Marriott Basin trail, along the east bank of Cayoosh Creek.
Follow the Duffy Lake Road SW across the creek for about 1km to get back to your car.
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