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California Historical Landmarks in Modoc County
 
 
 
California Landmark 15
Bonner Grade
Highway 299 (Milepost 51.3)
6.2 Miles West of Cedarville
California Historical Landmark 15: Bonner Grade Over the Warner Mountains in Modoc County, California
23 September 2006
(Click Photo to Zoom)
Bonner Grade

The first road from Cedarville to Alturas followed the course of the present highway over Warner Mountains from Surprise Valley. It was named in honor of John H. Bonner, who was instrumental in securing the construction of the road over Bonner Grade in 1869.

Citation from California Office of Historic Preservation

We were unable to locate a commemorative plaque for the Bonner Grade.
 
 
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