The datum is defined by the observed heights of mean sea level at the 26 tide gauges and by the set of elevations of all bench marks resulting from the adjustment. A total of 106,724 kilometers of leveling was involved, constituting 246 closed circuits and 25 circuits at sea level.
George Washingtonâs Mount Vernon is located roughly 15 miles south of Washington, D.C. and 8 miles south of Alexandria, Virginia on the banks of the Potomac River, at the southern end of the George Washington Memorial Parkway.
Driving distance from Detroit, MI to Washington, DC. The total driving distance from Detroit, MI to Washington, DC is 525 miles or 845 kilometers. Your trip begins in Detroit, Michigan. It ends in Washington, District of Columbia. If you are planning a road trip, you might also want to calculate the total driving time from Detroit, MI to Washington, DC so you can see when you'll arrive at your destination.