WILLIAM LOUIS MARSHALL - (1846-dead) - Army Engineer, born in Mason County, Kentucky. Graduated at West Point (1868) after service as private in the U.S. volunteers in the Civil War. Served with battalion of engineers at Willets Point, N.Y. (1868-71), taught at West Point, and (1862-76) was in charge of the Colorado section U.S. geographical and geological surveys west of the 100th meridian. Discovered Marshall pass across continental divide at the summit of the Rocky Mountains. Engaged in river improvement in Georgia, Tennessee and Alabama (1870-81) and improvements of the Mississippi river and construction of leveas (1881-84), and other leaves and construction work until (1900), then in charge of fortifications at the eastern and southern entrances to New York harbor. Inventor of many inprovements in hydraulic construction.