28 October 2018

99 Percent Invisible: Plat of Zion

The urban grid of Salt Lake City, Utah is designed to tell you exactly where you are in relation to Temple Square, one of the holiest sites for Mormons.

Addresses can read like sets of coordinates. “300 South 2100 East,” for example, means three blocks south and 21 blocks east of Temple Square. But the most striking thing about Salt Lake’s grid is the scale. Blocks are 660 feet on each side. That means walking the length of two football fields from one intersection to the next. By comparison, nine Portland, Oregon city blocks can fit inside one Salt Lake block.

Created by Mormon settlers, the grid of Salt Lake was part of an effort to create a spiritual utopia. Joseph Smith, founder of the Church of Jesus Christ of Latter-day Saints, began this plan with a document called the Plat of Zion. The plat provided details as to the measurements of roads, how lots would be arranged, how many people would live there. The original document can be found on display in the Church History Museum in Temple Square.

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