It's nearly 9 km to hike to Hidden Lake. There is no trail from Hidden Lake to the col, but we headed for an obvious horn-shaped rock on the col where a good trail begins. The ascent straightforward from there: just follow the ridgeline.
Postscript: The following year an inexperienced woman fell to her death on Mount Richardson.
Mt. Richardson before reaching Hidden Lake
After passing Hidden Lake we look for a way up
Slabs on the slope
Looking back at Hidden Lake
The trail follows the ridge
Looking back at the ridge
Slog to the false summit
We finally reached the rocks above the scree slope
First cairn (far left) marks the false summit. The true summit is some distance away.
The summit is nearly flat
Mount Redoubt above Hidden Lake
Standing on the rock where the trail begins
82 N/8 Lake Louise