• Source: Colorado Department of Highways

      • The Colorado Department of Highways is the antecedent of today's Colorado Department of Transportation.
      Along with many other functions, it served as a bridge architect and at times as a bridge builder. Many of its bridges are listed on the U.S. National Register of Historic Places.
      Studies of Colorado's historic bridges, to assess which ones could qualify for National Register listing, were conducted in 1983, 1987, 2000, and 2011. The latter study evaluated "712 bridges and grade separations" which had been built during 1959 to 1968.
      Works (attribution) include:

      Big Thompson River Bridge I, US 34 at milepost 65.53, Estes Park
      Big Thompson River Bridge II, US 34 at milepost 66.22, Estes Park
      Big Thompson River Bridge III, US 34 at milepost 85.15, Loveland
      Big Thompson River Bridge IV, US 34 at milepost 86.04, Loveland
      Black Squirrel Creek Bridge, built 1935, US 24 at milepost 327.33, Falcon No longer exists. Replaced in 2012.
      Bridge over Arkansas River, U.S. Hwy 24, Buena Vista
      Cherry Creek Bridge, CO 83 at milepost 46.30, Franktown
      Colorado River Bridge, I-70 Frontage Rd. at milepost 62.90, De Beque
      Cottonwood Creek Bridge, On Vincent Dr. over Cottonwood Creek., Colorado Springs
      Dolores River Bridge, CO 90 at milepost 15.22, Bedrock
      Dotsero Bridge, I-70 Service Rd. at milepost 133.51, Dotsero
      Eagle River Bridge, US 6 at milepost 150.24, Eagle
      Granada Bridge, US 385 at milepost 97.32, Granada
      Gunnison River Bridge I, US 50 Service Rd. at milepost 155.41, Gunnison
      Gunnison River Bridge II, US-50 Service Rd. at milepost 155.59, Gunnison
      Little Fountain Creek Bridge, CO 115 at milepost 36.84, Widefield No longer exists. Replaced in 2004.
      Little Thompson River Bridge, I-25 Service Rd. at milepost 249.90, Berthoud
      Maitland Arroyo Bridge, CO 69 at Milepost 3.0, Walsenburg
      Marble Town Hall, 407 Main St., Marble
      Maroon Creek Bridge, CO 82, Aspen
      Ohio-Colorado Smelting and Refining Company Smokestack, NE of Salida at jct. of SR 150 and 152, Salida
      Plum Bush Creek Bridge, US 36 at milepost 138.16, Last Chance
      Rainbow Arch Bridge, CO 52, Fort Morgan
      Rio Grande Railroad Viaduct, CO 120 at milepost 0.17, Florence
      Rito Seco Creek Culvert, CO 142 at milepost 33.81, San Luis
      Rouch Gulch Bridge, US 50 at milepost 230.12, Swissvale
      San Luis Bridge, Off CO 159, San Luis
      Spring Creek Bridge, US 24 at milepost 430.32, Vona
      West Plum Bush Creek Bridge, US 36 at milepost 134.59, Last Chance


      References

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