Topo Map of area of the California Nevada Oregon Boundary Monument established in the 1872 Von Schmidt survey. Shows trail to the tripoint ( tri-point, or tri point) and USGS or NGS Benchmark marker. This historic boundary marker is the corner of the legal boundary, as decided in the US Supreme Court. Described in the Decree of the Supreme Court, in California v. Nevada, case 456 U.S. 867 (1982). Decided June 10, 1980. "That the location of the boundary between the States of California and Nevada is as hereafter specified: " "Beginning at the Initial Point on the California-Nevada boundary as established under authority of the Act of June 10, 1872, 17 Stat. 358, by Allexey W. Von Schmidt in 1872 as an eight (8) inch square wood post set in a large mound of stone at the intersection to the 42nd parallel of north latitude along the southern boundary of the State of Oregon and the 120th degree of longitude west from Greenwich, each as reported by him; thence running southerly along said 1872 boundary as surveyed and marked by Allexey W. Von Schmidt to a cast iron monument designated as Von Schmidt Milepost 191 on said boundary..."