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| State Highways in Colorado | |
|---|---|
.svg) .svg) .svg)   State highway signs for SH 5 (1926), SH 30 (1946), SH 50 (1952), and modern day SH 83 and SH 470 | |
| Highway names | |
| Interstates | Interstate X (I-X) |
| US Highways | U.S. Highway X (US X) |
| State | State Highway X (SH X) |
| System links | |
| |
The state highways of Colorado are a system of public paved roads funded and maintained by the Colorado Department of Transportation (CDOT) in the U.S. state of Colorado. These are state highways, which are typically abbreviated SH. The numbered highways within the state begin at 1 and increase, with exception of numbers already designated as United States Numbered Highways or Interstate Highways. In 1953, many highways were decommissioned or lost mileage. Before the 1968 Colorado state highway renumbering, highways were cosigned with U.S. Highways and Interstate Highways, and there were highways matching U.S. Highway and Interstate Highway numbers.
Description
The numbered state highway system covers approximately 3,135 miles of road in Colorado, subtracting the total miles of Interstate and US Highways from 9,100 miles of the state highway system.[1] These are maintained using state funds which are collected by state and federal gas tax and a portion of vehicle registration fees.[2] Unlike the numbering systems of the Interstate Highway System and the United States Numbered Highway System handled by the American Association of State Highway and Transportation Officials (AASHTO), the numbered state highway system is a separate system used by the state. The route markers used are separate from neighboring states rather than being consistent. In Colorado, the route markers are designed with the state flag on the top half and the number on the bottom half.
Most state highways are generally two lane roads with speed limits up to 65 miles per hour in rural areas but can drop as low as 30 miles per hour in served communities. In urban areas, they can be six to eight lane expressways primarily in Denver and Colorado Springs. Some numbered routes are concurrent with US highways and Interstate Highways and concurrent sections of state highway are not recognized by CDOT. Concurrent sections generally has its mileage based off the Interstate or US Route mileage (e.g. SH 88 being concurrent with I-25) and are sometimes unsigned.[3] The longest state highway is State Highway 14 with a span of nearly 237 miles (381 km) between Muddy Pass and Sterling. State Highway 110 is the shortest route maintained by CDOT with a span of 0.186 miles (0.299 km).
The Colorado Department of Transportation (CDOT) is the agency responsible for maintaining the Colorado State Highway System, including Interstate Highways, United States Numbered Highways, and numbered state highways within the state of Colorado.[4]
State highways
| Number | Length (mi)[a] | Length (km) | Southern or western terminus | Northern or eastern terminus | Formed | Removed | Notes |
|---|---|---|---|---|---|---|---|
 SH 1
|
10.053[5] | 16.179 | US 287 near Fort Collins | I-25 at Wellington | c. 1923[6] | current | Was a cross state highway that ran from New Mexico to Wyoming until 1968. Turned back sections are now I-25, US 85, and US 287[6] |
 SH 2
|
19.944[7] | 32.097 | US 285 at Denver | I-76 near Brighton | c. 1923[8] | current | Until 1968, went west to Utah via US 40 and northeast to Nebraska via US 6 and US 138; rerouted south of US 40 in 1968; extended north to SH 7 in 1998, but that section was given to the city of Brighton in 2010[8] |
 SH 3
|
82.745 | 133.165 | US 85 at the Wyoming border | I-80S in Henderson | c. 1923 | 1968 | Carrier route overlapping US 85[9] |
 SH 3
|
2.44 | 3.93 | US 160/US 550 near Durango | US 160/US 550 near Durango | c. 1981 | current | |
 SH 4
|
— | — | Utah border | Kansas border | c. 1923 | 1968 | Carrier route overlapping US 24 |
 SH 5
|
— | — | US 87 near Carr | US 85 near Carr | c. 1923 | 1938 | Now CR 126 |
 SH 5
|
— | — | SH 259 near Windsor | Galeton | c. 1938 | 1953 | Now CR 74 |
 SH 5
|
— | — | Iliff Avenue in Denver | SH 70 in Denver | c. 1953 | 1954 | Syracuse Way, Denver |
 SH 5
|
14.89 | 23.96 | Summit of Mount Blue Sky | SH 103 near Idaho Springs | 1954 | current | |
 SH 6
|
— | — | Grand Junction | Kansas border | c. 1923 | 1968 | Carrier route overlapping US 50 |
 SH 7
|
81.64 | 131.39 | US 36 in Estes Park | I-76 in Brighton | c. 1923 | current | |
 SH 8
|
8.68 | 13.97 | US 285 near Morrison | SH 121 at Lakewood | c. 1923 | current | Until 1968, continued southwest to US 24/SH 4 via US 285 and continued east to Kansas via Wadsworth Avenue, Jewell Avenue, Pierce Street, Mississippi Avenue, Morrison Road, Alameda Avenue, I-25, and US 40 |
 SH 9
|
138.92 | 223.57 | US 50 near Cañon City | US 40 in Kremmling | c. 1923 | current | Until 1953, continued via Royal Gorge to Cañon City |
 SH 10
|
71.96 | 115.81 | I-25/US 160 at Walsenburg | US 50 at La Junta | c. 1923 | current | Until 1968, continued west to Utah via US 160 and US 491 |
 SH 11
|
— | — | US 6 at Wolcott | SH 9 at Kremmling | c. 1923 | 1953 | southern portion replaced by SH 131; remainder is now Trough Road / CR 1 |
 SH 11
|
— | — | Nevada Avenue in Colorado Springs | Nevada Avenue in Colorado Springs | c. 1958 | 1968 | Carrier route overlapping I-25 |
 SH 11
|
1.35 | 2.17 | US 138 at Julesburg | Nebraska state line | c. 1970 | current | |
 SH 12
|
70.36 | 113.23 | US 160 at La Veta | I-25 at Trinidad | c. 1923 | current | Until 1968, continued northeast to La Junta via US 350 |
 SH 13
|
127.99 | 205.98 | I-70 near Rifle | WYO 789 near Baggs | c. 1923 | current | |
 SH 14
|
236.92 | 381.29 | US 40 at Muddy Pass | US 6 at Sterling | c. 1923 | current | Until 1968, continued east via US 6 to Nebraska |
 SH 15
|
30.92 | 49.76 | US 160/US 285 in Monte Vista | US 285 in La Jara | c. 1923 | current | |
 SH 16
|
— | — | US 40 in Granby | US 6 in Wiggins | c. 1923 | 1968 | Carrier route overlapping US 34 |
 SH 16
|
1.31 | 2.11 | I-25 in Security | SH 21 in Widefield | 1971 | current | Extended east from Syracuse Street to SH 21 (which was created that same day) in October 2007 |
 SH 17
|
88.5 | 142.4 | New Mexico state line | US 285 south of Villa Grove | c. 1923 | current | |
 SH 18
|
— | — | Julesburg Reservoir near Sedgwick | US 138 in Ovid | c. 1938 | 1953 | |
 SH 18
|
— | — | I-25 in Pueblo | US 50 near Avondale | c. 1958 | 1968 | Carrier route overlapping US 50 |
 SH 18
|
0.29 | 0.47 | Spruce Mountain Road | Jct I-25 Exit 172 near Larkspur | 1973 | c. 1999 | Signage not removed until 2001; now Upper Lake Gulch Road; was the shortest state highway with a length of 1531 feet |
 SH 19
|
— | — | New Mexico border | US 50 in Montrose | c. 1923 | 1968 | Carrier route overlapping US 550 |
 SH 20
|
— | — | SH 119 west of Golden | SH 58/SH 93 in Golden | c. 1934 | c. 1951 | Replaced by US 6 |
 SH 20
|
— | — | BL 70/US 6/US 50 in Grand Junction | US 6 in Palisade | c. 1956 | 1968 | Replaced by parts of BL 70, US 6, and US 50 |
 SH 21
|
— | — | US 85 near Platteville | US 85 near Platteville | c. 1923 | 1939 | Loop east of US 85 through Platteville |
 SH 21
|
— | — | Near Paoli | Near Paoli | c. 1938 | 1953 | Spurs north and south off US 6 |
 SH 21
|
— | — | Loyd | SH 13 south of Hamilton | c. 1953 | 1954 | |
| SH 21
|
— | — | Nebraska border | SH 14 near Stoneham | c. 1954 | 1964 | Became part of SH 71 |
 SH 21
|
20.56 | 33.09 | SH 16 (Mesa Ridge Parkway) in Security-Widefield | SH 83 near Black Forest | 2007 | current | Established in October 2007 and is co-signed with Powers Boulevard |
 SH 22
|
— | — | 20th Street in Greeley | Current BL 34 in Greeley | c. 1936 | 1953 | |
 SH 22
|
2.47 | 3.98 | Brighton Road in Henderson | Sable Boulevard near Brighton | c. 1953 | current | |
 SH 23
|
— | — | US 138 in Ovid | Nebraska state line | c. 1938 | 1953 | |
 SH 23
|
— | — | SH 62 in Ridgway | US 550 near Ouray | c. 1953 | 1989 | Now CR 23 and CR 3A |
| SH 23
|
17.83 | 28.69 | US 385 in Holyoke | N-23 at the Nebraska state line | 1989 | current | Renumbered from SH 176 to avoid confusion with nearby I-76 and to match Nebraska |
 SH 24
|
— | — | US 6 west of Holyoke | US 385 south of Holyoke | c. 1938 | 1953 | |
 SH 24
|
— | — | 104th Avenue and Colorado Boulevard in Thornton | SH 2 in Commerce City | c. 1953 | 1968 | Renumbered to SH 44 to avoid confusion with US 24 |
 SH 25
|
— | — | Logan CR 81 | US 138 in Crook | c. 1938 | 1968 | Renumbered to SH 55 to avoid confusion with I-25 |
 SH 26
|
— | — | — | — | c. 1938 | c. 1940 | |
 SH 26
|
— | — | — | — | c. 1940 | 1953 | |
 SH 26
|
— | — | — | — | c. 1953 | 1965 | |
 SH 26
|
2.82 | 4.54 | SH 95 in Denver | I-25 in Denver | c. 1966 | current | |
 SH 27
|
— | — | — | — | c. 1938 | 1953 | |
| SH 27
|
— | — | — | — | c. 1953 | 1956 | |
 SH 27
|
— | — | — | — | c. 1956 | 1968 | Carrier route for US 85-87 |
 SH 28
|
— | — | — | — | c. 1938 | 1953 | |
 SH 28
|
— | — | — | — | c. 1953 | c. 1989 | Turned back to the county when the US 287 Laporte bypass was built; now CR 52E |
 SH 29
|
— | — | — | — | c. 1938 | 1953
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