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US Highway endpoints in Colorado

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US 285 [I] south end 1926-1933
Denver
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US 285 [I] south end 1933-1934
Denver
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US 285 [I] south end 1934-1935
Denver
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US 285 north end 1936-1959
Denver
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US 36 west end 1937-1946
Denver
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US 36 west end 1952-1958
Denver
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US 36 west end 1959-1968
Denver
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US 285 north end 1959-1969
Denver
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US 285 north end 1969-1979
Aurora
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US 285 north end 1979-present
Denver
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US 138 west end 1926-present
Sterling
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US 36 west end 1929-1933
Byers
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US 36 west end 1934-1936
Strasburg
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US 36 west end 1947-1951
Denver
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Common: US 6 / US 38
Greeley
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US 287 south end 1935-1940
Fort Collins
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US 36 west end 1968-1978
Estes Park
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US 36 west end 1978-present
Deer Ridge Jct.
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US 34 west end 1939-present
Granby
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US 24 west end 1975-present
Minturn
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US 650 south end 1926-1934
Salida
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US 650 south end 1934-1936
Salida
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US 650 north end 1926-1936
near Buena Vista (Early CDoT maps indicate this junction was on the east side of the river and the railroad, and the current bridge over the Arkansas wasn't built until 1937. Prior to that, US 40-S [the precursor to US 24] followed the green line - at the time there was a bridge that connected today's CR 301 and CR 317.)
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Common: US 24 / US 40S
Grand Junction
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US 24 west end 1960-1975
Grand Junction
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US 550 north end 1926-2009
Montrose
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Common: US 160 / US 450
Utah state line
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US 666 north end 1926-1938
Cortez
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Common: US 666 / US 84 / US 164
Cortez
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US 550 south end 1926-1934
Durango
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US 84 west end 1943-present
Pagosa Springs
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US 450 east end 1926-1934
Walsenburg
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US 350 west end 1950s-1990s
Trinidad
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Common: US 160 / US 350
Trinidad
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US 350 west end 1990s-present
near Trinidad
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US 350 east end 1931-1932
La Junta
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US 350 east end 1932-1934
La Junta
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US 350 east end 1934-1960s(?)
La Junta
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US 350 east end 1960s(?)-present
La Junta
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US 400 west end 1996-present
Granada
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US 550 north end, 2009-present
Montrose (US 50 has been rerouted along San Juan Av, so US 550 has been extended to this junction, but I'm not sure whether the new configuration has been signposted yet.)