The U.S. Lock and Dam #19 was constructed between 1910 and 1919. When it was completed, it was the largest electrical generating plant in the world. Lock #19 is on the National Register of Historical places. This panorama was taken from the old swinging railroad bridge and observation deck below the dam at the lower end of the Lock. The locks are 1200 feet long and 100 feet wide. They lift a fleet of barges on the Mississippi River over 38 feet. In 2010, the River carried over 31 million tons of cargo past this point. The Lock is owned and operated by U.S. Army Corps of Engineers. The power house and spillways are owned and operated by AmerenUE, a private utility company. Keokuk, Iowa is at the Des Moines Rapids of the Mississippi. Before the dam was built, these rapids, over 12 miles long, were a serious impediment to river traffic.