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Tilden and Wilmer Lakes Route History
Research reveals that the current PCT route around Wilmer Lake was not built until sometime after 1931 and before 1939, as indicated by the Yosemite Park Maps of 1931 and 1939.
The 1931 map shows the current route of the TYT around Tilden Lake as being the main route across the North Yosemite Backcountry with no route around Wilmer Lake.
The map of 1939 shows a trail from Wilmer Lake connecting with the trail around Tilden Lake between Bailey and Macomb Ridges. This is the current trail configuration.
These maps appears on page 906 of Green's Yosemite: the Park and its Resources.
Current map of Jack Main Canyon with Tilden and Wilmer Lakes.
I collected this information while figuring out the...
History of Wilmer Lake name changes: Brannigan to Wilmer to Wilma Lake