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  • In 1970, the population of Thornton was 13,326.
  • The City annexed property south of 88th Avenue and west of Huron Street in 1970, along with land on Colorado Boulevard from 104th to 108th Avenues and the area south of 84th Avenue and west of Interstate 25.
  • Also in 1970, Thornton’s 500,000-gallon tower at 102nd Avenue and Tejon Street was built.
  • In 1971, Thornton sues to condemn Farmers Reservoir and Irrigation Company (FRICO).
  • In 1973, a Community Center was constructed on Eppinger Boulevard to meet the recreational needs of Thornton citizens.
  • Also in 1973, the City's Parks and Recreation Department became a full-time department.
  • In 1974, the City Council adopted the City's first Parks & Recreation Open Space Plan, and in that same year Loomis Park was dedicated.
  • In 1974, Thornton constructed the Columbine Water Treatment Plant located near the South Platte River, which supplied drinking water to citizens.
  • Growth prompted a move in 1975 to the remodeled North Valley Bank building at 8992 North Washington Street, which now houses the Thornton branch of the Adams County Public Library.
  • In 1975, the City's 20-year Comprehensive Plan was approved.
  • In 1975, Thornton High School opened.
  • In 1975, Thornton's first recreation center opened on Eppinger Blvd.
  • In 1976, the nation celebrated its Bicentennial while Colorado was enjoying its Centennial birthday and Thornton celebrated its owns 20th anniversary. Since Thornton was sharing a significant anniversary with the nation, the City was designated an official Bicentennial City by the American Revolution Bicentennial Administration.
  • In 1979, FRICO water agreement is reached with three cities (including Thornton).
  • November 1979, Margaret Carpenter is elected as Mayor, and serves for more than 20 years.

1950s /  1960s /  1970s /  1980s /  1990s /  2000s /  Future

City of Thornton
9500 Civic Center Drive, Thornton, CO 80229
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