On California Route 88, on the left when traveling east.
"A part of the way the rocks cover the ground so large that it is with the greatest difficulty that we can find a place to drive our waggons [sic] through the trail is quite crooked" - Amasa Morgan, Jul 24, 1849 — — Map (db m211141) HM
On Crystal Springs Road, on the right when traveling west.
"The river here is…filled with large rocks. We crossed on a bridge but expect to ford the next times…We started through Mad Canyon which is rightly named…the hardest place for teams I ever saw" - Caroline L. Richardson, Sep 12, 1852 — — Map (db m211142) HM
On Carson Pass Highway (California Route 88) at Emigrant Trail, on the left when traveling east on Carson Pass Highway.
"Thence over a high sloping stony hill (sloping to the river) and down a steep hill to a canon or pass creek, where comes the first tug of war! Through the first range of the Sierra Nevada mountains" - Giles S. Isham, Aug 5, 1850 — — Map (db m211139) HM
On Diamond Valley Road just west of Airport Road, on the left when traveling east.
This marks the home of John Albert Thomson (Snowshoe Thomson), great pioneer of the Sierra and hero of the mountains, who for twenty winters carried the mail over deep snow of the mountains on his long skiis [sic], giving help to those in . . . — — Map (db m209084) HM