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.
Mount Vernon Police Department. THE MOUNT VERNON POLICE DEPARTMENT IS A 24 HOUR SERVICE. IF YOU HAVE A NON EMERGENCY PLEASE CALL THE NUMBER PROVIDED BELOW. IF YOU HAVE AN EMERGENCY PLEASE CALL 911. NON EMERGENCY 319-895-6141. IF THE POLICE DO NOT ANSWER THE NON EMERGENCY NUMBER THE CALL WILL ROLL OVER TO LINN COUNTY.