It rises dramatically 1,267 feet (386 m) above the Belle Fourche River, standing 867 feet (265 m) from summit to base. The summit is 5,112 feet (1,559 m) above sea level.
Devils Tower was the first declared United States National Monument, established on September 24, 1906, by President Theodore Roosevelt.The monument's boundary encloses an area of 1,347 acres (545 ha).
In recent years, about 1% of the monument's 400,000 annual visitors climbed Devils Tower, mostly using traditional climbing techniques.
According to wikipedia