Eagle is a city in Ada County, Idaho, ten miles (16 km) northwest of downtown Boise.

Eagle Island in Idaho was settled in 1863 by Truman Coe Catlin, who later shifted from crop farming to dairy farming, starting the island's dairy tradition.

Despite the construction of Arrowrock Dam in 1915 and subsequent dams, flooding has been a recurrent issue for residents, leading to continued efforts to mitigate flood risks.

[6] The Eagle Fish Hatchery, established in the late 1940s in Idaho, was originally part of a trout program until the 1980s.

[7] In 1991, it was restructured to support the conservation of Snake River sockeye salmon, an endangered species listed that year.

The hatchery's mission shifted to preserving the species and its genetic diversity through the development of eight broodstocks derived from smolts, anadromous adults, and residual populations.

It also houses the IDFG Eagle Fish Health Laboratory.

[11] Eagle is home to many retired civil servants, especially police officers and firefighters, from California.

The Los Angeles Times has described California pension money from CalPERS as "the lifeblood of the economy" in Eagle.

[14] At the 2020 census there were 30,346 people, 10,610 households, and 8,293 families living in the city.

[15] At the 2010 census there were 19,908 people, 7,069 households, and 5,585 families living in the city.

At the 2000 census there were 11,085 people, 3,864 households, and 3,098 families living in the city.