Eagle is a city in Ada County, Idaho, ten miles northwest of downtown Boise. The population was 30,346 at the 2020 census. Eagle Island i…Eagle is a city in Ada County, Idaho, ten miles northwest of downtown Boise. The population was 30,346 at the 2020 census. 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. He also pioneered irrigation in the area by constructing a wide irrigation ditch. The most notable early community developer was Thomas Hugh Aiken, a Canadian surveyor, who helped establish the Eagle community in the 1870s. 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.
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