Clara and Henry Ford built Fair Lane along the Rouge River to use both its beauty and its power, adding a dam and hydroelectric power plant to supply the estate with electricity. Fair Lane architect William Van Tine wrote in March 1916 that the powerhouse was unique both as a complete source of power for the house and as a practical experimental department for Henry Ford's private use. Thomas A. Edison, Henry Ford's mentor and close friend, laid the Powerhouse cornerstone on October 28, 1914. In 1913, the Fords hired Danish-American landscape architect Jens Jensen, whose prairie-style plans emphasized native plants, wandering and discovery, and included an expansive meadow, naturalistic garden areas, a stone dam with a pathway across the top, and layered limestone walls along the riverbank. Jensen also worked for Henry Ford on the Dearborn Inn, Henry Ford Hospital, Greenfield Village, and the Ford Pavilion at the 1933 Chicago Century of Progress Exposition. In 2011, a 100 foot section of the riverbank near the Main Residence collapsed after years of erosion by the Rouge River. In 2014, architects and engineers at SmithGroupJJR in Ann Arbor, MI, working with Henry Ford Estate staff, researched the original construction details and developed a reconstruction plan, and Faust Construction, Albaugh Masonry, and Inland Lakes Landscaping began rebuilding the wall with irregular limestone rock terraces, steps, and walkways, while a wooden foot bridge was replicated from historic aerial photography and hidden sheet piling was added for support. The reconstruction efforts were to conclude by the end of 2015.