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US Says Goodbye to the Foot

Which means America is now 28 feet wider
By Newser Editors and Wire Services
Posted Dec 14, 2019 10:00 AM CST
Geodesist Michael Dennis, NOAA's National Geodetic Survey, holds a copy of the Manual of Surveying Instructions Thursday, Nov. 21, 2019, in Laveen, Ariz.   (AP Photo/Ross D. Franklin)
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(Newser) – Change is afoot for the official measuring stick used to size up big places in America, the AP reports. The reason? There are actually two different definitions of the 12-inch measurement known as a foot. Some land surveyors use what's known as the US survey foot. Others use the definition that's more accepted by the broader world: the international foot. The difference between them is so tiny that you can't see it with the naked eye on a 12-inch ruler. But over big distances, it matters. So, to reduce the chance for errors and confusion, the federal government has announced it's finally giving the boot to the survey foot. The international foot is the smaller one—adding about an eighth of an inch of difference when measuring a mile.

That means the US is 28.3 feet wider when measured using the international foot instead of the survey foot. The change started in 1959, when the federal government mandated that everyone use the international foot but allowed surveyors to keep to the old US survey foot for a while. That temporary reprieve has lasted 60 years, but it will finally end in 2022, the National Oceanic and Atmospheric Administration and the National Institute of Standards and Technology announced in October. Surveyors in 40 US states and territories still use the larger US foot. The rest use the smaller international one. "We have chaos," says an NOAA project manager, who notes that the discrepancy has caused delays in various projects, including the plan for high speed rail in California.

(Read more measurement stories.)

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