United States Meridian Base | Temple Square’s Historic Marker
This stone monument marks the U.S. Meridian Base of 1869, the official starting point for the Salt Lake Meridian, the survey reference line that defines the addressing system for the entire state of Utah! It sits on Temple Square grounds, just north of the Salt Lake Temple, precisely at 40°46′13″ N, 111°54′00″ W. Every street, property line, and land survey in Utah traces back to this exact spot. Its Story - The Survey Begins (1869) : The U.S. Coast Survey established this marker to define the principal meridian and base line for the Utah Territory. It was placed here because Temple Square was already the geographic and cultural center of the city, and the temple site was the most accurately surveyed location in the region. - How It Works : All east–west addresses in Salt Lake City are measured from Main Street (the meridian line), and all north–south addresses are measured from South Temple Street (the base line) — with this marker a...