even submerged the five waterfalls. Black Eagle Dam was built in 1890, and half of Black Eagle Falls are now submerged in the reservoir behind the dam. This structure was the first hydroelectric dam built in the state. Rainbow Falls was dammed in 1910 when Rainbow Dam was built. The reservoir behind the dam submerged Colter Falls. Volta Dam was built on top of the Great Falls in 1915, and later renamed Ryan Dam in 1940 in honor of John D. Ryan, the president and founder of the Montana Power Company. Historic district and interpretive centers The Great Falls Portage, a National Historic Landmark District designated in 1966, commemorates the route by which Lewis and Clark bypassed the falls. The landmarked areas, including the expedition camps at either end of the portage, are located well above and below the series falls. The Great Falls are also part of the Lewis and Clark National Historic Trail, established by Congress in 1978. The Lewis and Clark National Historic Trail Interpretive Center was built in 1998 on a cliff overlooking the Missouri River near Crooked Falls. It provides an extensive look into Lewis and Clark's discovery of the Great Falls and their portage around them, as well as exhibits on native peoples of the area. In 1989, the City of Great Falls, the Montana Department of Fish, Wildlife and Parks, and other public and private bodies established the River's Edge Trail, a series of paved and unpaved trails that follow the Great Falls as well as the Lewis and Clark Expedition portage route (along with other scenic and historic area of the City of Great Falls and town of Black Eagle). In art The first known drawing of the Great Falls was entered by Meriwether Lewis in his diary. In 1807, Lewis commissioned the Irish engraver John James Barrelet to make drawings of the Great Falls. After Lewis's death in 1810, William Clark visited his home and found the drawings, but they have since disappeared. The Great Falls have been depicted in well-known paintings over the years. The waterfalls may be seen in the background of John Mix Stanley's large painting "Barter for a Bride" (originally titled "A Family Group"), which was painted some time between 1854 and 1863 and now hangs in the Diplomatic Reception Room in the United States Department of State in Washington, D.C. The noted Western painter O. C.