1880–1925

Plans for Power House on American Falls (1902)

The city of American Falls was first platted in the early 1880s. It was named for the waterfall on the Snake River near the settlement. During the last part of the 19th century, privately financed irrigation canals were created to sustain the emerging agriculture industry in southern Idaho and other parts of the west. The Carey act (1894) paved the way for private investment in irrigation projects. By 1895, the American Falls irrigation project came before the Idaho State Land Board. In 1902 the National Reclamation Act was signed into law and federal funds from the sale of public lands became available to create and maintain irrigation projects in the Western United States. The first power plant was built in 1902 on the falls and was acquired by the Idaho Power Company in 1916.^[6]

Damming the rivers became the preferred method for harnessing the abundant water of the western rivers.^[7] The reservoirs could then provide year-round downstream irrigation via canals, even during traditional low water times.

The use of eminent domain by the government to appropriate the original townsite in 1923 resulted in several lawsuits. One in particular, BROWN v. U S, 263 U.S. 78 (1923) allowed that the property valuation should include the value of the streets and improvements which would need to be replaced in the substitute site.^[8]

1925–1960

American Falls Dam (1947)

The first dam at American Falls was begun in 1925 by the Bureau of Reclamation and was completed in 1927. The river was temporarily impounded while the new concrete structure was put in place. The Oregon Short Line Railroad bridge over the river had to be raised to allow for crossing the new reservoir.^[9] This dam was designed by Frank A. Banks.^[10]

1960–1978

The existing dam is the second structure to be called the American Falls Dam. Core samples taken in the early 1960s of the concrete of the original structure revealed deterioration resulting in impaired durability and strength caused by a chemical reaction between components of the concrete. The solution was to replace the original dam with a second dam built downstream in 1978.^[11] Replacement of the original dam was authorized by a congressional act of December 28, 1973 (87 Stat. 904, Public Law 93-206).^[12] In 1976, the Idaho Power Company built the dam's current power plant which consists of three generators with a capacity to produce 112,420 kilowatts (112 MW) of hydroelectricity.^[6]

In 1976, the upstream Teton Dam failed during filling, causing spring snowmelt to race downstream into the Teton River, a tributary of the Snake, demolishing several towns along its path. In an attempt to contain this flood, water was released from American Falls Dam as quickly as possible. If the dam were to fail, the other Snake River dams would experience a flood they were not designed to cope with, although the lower Columbia River dams would most likely survive. The American Falls reservoir filled, but its level did not even rise to its spillway crest.^[13]

When the second dam was planned, members of the Shoshone and Bannock communities opposed expansion as it would further flood the lands of the Fort Hall Bottoms. Native Americans have inhabited this region for at least 10,000 years and the area is an important resource for them. Many scientists were opposed as well because of the loss of natural habitat and access to fossil records of the Bottoms.^[14]