Bonner Grade

Modoc County · 6.6 miles west of Cedarville on Cedar Pass Road · location approximate

First road from Cedarville to Alturas followed the course of the present highway over Warner Mountains from Surprise Valley. John H. Bonner, in 1869, was the one who was largely instrumental in securing the construction of the road over Bonner Grade, which was named in his honor.

1971 register text, presented as a historical document. It uses the period's terms for Native people; the state's landmark listings still carry most of this wording, and the California Office of Historic Preservation maintains the program's current texts.

Many of these plaques have since been recast or their texts revised. The California Historical Landmarks program and its current texts are maintained by the California Office of Historic Preservation. California Office of Historic Preservation ↗

David Rumsey Map Collection, Stanford Libraries

Marker data: State of California, Department of Parks and Recreation, California Historical Landmarks (1971)

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