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Originally measured as 14,433 feet (4,399 m) in height, Mount Elbert's elevation was later adjusted to 14,440 feet (4,400 m) following a re-evaluation of mapped elevations, which sparked protests. The actual change was made in 1988 as a result of the North American Vertical Datum of 1988; it seems the original measurement resulted from the Sea Level Datum of 1929. A matter of some contention arose after the Great Depression over the heights of Elbert and its neighbor Mount Massive, which differ in elevation by only 12 feet (3. 7 m). This led to an ongoing dispute that came to a head with the Mount Massive supporters building large piles of stones on the summit to boost its height, only to have the Mount Elbert proponents demolish them. The effort was ultimately unsuccessful and Mount Elbert has remained the highest peak in Colorado. The first motorized ascent of Elbert occurred in 1949, when a Jeep was driven to the summit, apparently to judge suitability for skiing development.