Interstate 70

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Interstate 70 passes through several tunnels as it crosses the Rocky Mountains, including the No Name Tunnel pictured here along westbound in Glenwood Canyon. Photo taken by Tim Kubat (2007).

Spanning the Centennial State, Interstate 70 is the 450-mile long freeway that bisects Colorado. Entering the state from Utah near Grand Junction, Interstate 70 follows the U.S. 6-50 corridor along the Colorado River. As it heads east out of Grand Junction, Interstate 70 travels through Glenwood Canyon, one of the last sections of Interstate 70 to be completed in the state of Colorado. The marvel of engineering a four-lane freeway through a tight canyon is awe inspiring to this day.

Winding through scenic Glenwood Canyon along Interstate 70 east ahead of No Name Lake. Photo taken 08/11/16.

Interstate 70 then enters the Rocky Mountains, connecting to several major ski resorts along the way: Aspen, Beaver Creek, Vail, Copper Mountain, Breckenridge, Arapahoe, and Keystone. Many of these resorts are very close to the freeway, while others are a bit of a distance from the freeway. Aspen, for instance, requires a trip along Colorado 82. However, many of the other resorts, are located within close proximity of the freeway. One can ski Vail and look down on Interstate 70.

But Interstate 70 is not just for skiers. It is also for those who want to see the Rocky Mountains at their best. With the combination of national forest, 14,000-foot tall mountains, snow, highway tunnels, and spectacular views, Interstate 70 is easier to describe with pictures than with words.

Interstate 70 Colorado Guides

Central 70 Project

The six lane freeway of Interstate 70 through northern Denver is part of what used to be the Colorado 72 expressway. The expressway was built in the mid-1960s between Sheridan Boulevard (Colorado 95) to the west, and Colfax Avenue (Business Loop I-70 and U.S. 40-287) to the east. While several portions of the old construction of Colorado 72 was superseded by a variety of reconstruction projects, parts of the original freeway remain, including the 46th Avenue Viaduct, and portions near the Interstate 270 merge. The Central 70 Project rebuilds ten miles of the freeway leading east from I-25 (Mousetrap Interchange) to Tower Road in the Gateway area. The $1.2 billion project runs from 2018 to 2013.

Approaching Colorado 2 (Colorado Boulevard) on Interstate 70 west through the Northeast Park Hill area of Denver. The freeway elevates onto the 46th Street Expressway just west of Colorado Boulevard. Photo taken 04/23/17.

Originally, Interstate 70 in Colorado was planned to end in Denver. This was due to the lack of interest in neighboring Utah to construct a connecting route along what was then U.S. 6-50. Officials from Colorado and Utah negotiated the concept of creating such a route, despite the enormous costs to construct the route through the mountains in both states. In October 1956, the federal government approved such a route, which would connect Interstate 25 with Interstate 15 near Cove Fort, Utah. Currently there are no plans to extend Interstate 70 any further west, although some have offered fanciful extensions of that route.

Between 1956 and 1992, Interstate 70 in Colorado was under construction. The very first segment of Interstate 70 was constructed in Denver, along the route of 46th Avenue in the northeastern part of the city. Construction of this section started in 1961 and opened on September 12, 1964. The first section to be completed west of the Continental Divide was Interstate 70 between Clifton and the Colorado 65 interchange in 1963. The final section to be completed and opened to traffic was in Glenwood Canyon; officials descended on the canyon to dedicate this freeway in October 1992.

Interstate 70 heads east from Silt toward a mesa and Grand Hogback ridge. This stretch of freeway east to New Castle was completed in 1973. Photo taken 08/11/16.

While construction continued on Interstate 70, incomplete segments used the old road. In some cases, the future freeway was constructed as a Super Two, with only two lanes (one lane in each direction) with interchanges. Examples of this included the section between Agate and the West Limon Bypass (Super Two completed in 1963, four-lane freeway completed in 1968) and the section between Seibert and Bethune (Super Two completed in 1966, four-lane freeway completed in 1971).

Many superlative achievements occurred on Interstate 70 in Colorado. The freeway was an engineering marvel as it weaved through and around mountains, and it was perhaps the most famous for its Continental Divide tunnel. Originally planned as the Straight Creek Tunnel, the Eisenhower Tunnel is the common name for the two tunnels that burrow under Loveland Pass. The original tunnel was the Eisenhower Tunnel, which is now the westbound lanes of Interstate 70. Construction of this tunnel began in 1968; it was completed and opened to traffic on March 8, 1973. The second tunnel bore was the Edwin C. Johnson Tunnel. It was constructed between 1972 and 1980. Tunnels were constructed in several other locations along Interstate 70, including Beavertail (near De Beque), Glenwood Canyon, and Idaho Springs. A stream bed along a three-mile section of Tenmile Creek west of Frisco had to be channeled onto a new stream bed.

According to Colorado Department of Transportation 50th Anniversary of the Interstate Highway System web page, the completion of the Glenwood Canyon segment marked the final link in the mainline Interstate Highway System (excluding spur, bypass, and other three-digit Interstates). The Glenwood Canyon section of Interstate 70 contains plenty of recreation opportunities, including a bikepath for the entire length and four rest areas. The section of Interstate 70 over Vail Pass also features a bike path.

Interstate 70 passes through Beavertail Tunnel on the winding course north through De Beque Canyon in Mesa County. Photo taken 08/10/16.

The following chart shows the dates on which each section of Interstate 70 was opened, from the Utah State Line to the Kansas State Line.

Section Distance Completion Date
From Utah State Line east to Mack 11 miles 1973
From Mack east to Fruita 8 miles 1972
From Fruita east to 22 Road 6 miles 1969
From 22 Road east to Horizon Drive 5 miles 1967
From Horizon Drive east to Clifton 6 miles 1965
From Clifton east to SH 65 12 miles 1963
From SH 65 east to De Beque 13 miles 1989
From De Beque east to Parachute 13 miles 1984
From Parachute east to Rulison 6 miles 1983
From Rulison east to the West Rifle Interchange 6 miles 1980
From the West Rifle Interchange east to Silt 11 miles 1976
From Silt east to New Castle 8 miles 1973
From New Castle east to Chacra 4 miles 1971
From Chacra east to Glenwood Springs 7 miles 1971
From Glenwood Springs east to No Name 3 miles 1966
From No Name east to the East End of Glenwood Canyon 12 miles 1992
From East End of Glenwood Canyon to Gypsum 7.8 miles 1980
From Gypsum east to Eagle 8 miles 1979
From Eagle east to Wolcott 10 miles 1973
From Wolcott east to Avon 10 miles 1971
From Avon east to Dowd Junction (U.S. 24) 4 miles 1970
From Dowd Junction east to East Vail 6 miles 1968
From East Vail east to Wheeler Junction via Vail Pass 15 miles 1969
From Wheeler Junction east to Frisco via Tenmile Canyon , including SH 91 interchange 6 miles 1979
From Frisco to Silverthorne 5 miles 1972
From Silverthorne to the west portal of the Eisenhower-Johnson Memorial Tunnels 7 miles 1973
Eisenhower-Johnson Memorial Tunnels 1.7 miles 1973, 1980
From east portal of the Eisenhower-Johnson Memorial Tunnels to Silver Plume 10 miles 1972
From Silver Plume east to Exit 232, U.S. 40 near Empire 6 miles 1968
From Exit 232, U.S. 40 east to Idaho Springs (west entrance, Business Loop I-70) 7 miles 1966
Idaho Springs Bypass, from west entrance to east entrance 2 miles 1961
From Idaho Springs (west entrance) east to Exit 244, U.S. 6 3 miles 1961
From Exit 244, U.S. 6 east to Beaver Brook 4 miles 1975
From Beaver Brook east to SH 74, Evergreen Parkway/El Rancho 4 miles 1972
From SH 74 east to Genesee Mountain Interchange 2 miles 1972
From Genesee Mountain Interchange east to Lookout Mountain Interchange 2.4 miles 1970
From Lookout Mountain Interchange to SH 26 and Business Loop I-70 ( Mount Vernon Canyon ) 2.8 miles 1970
From SH 26 and Business Loop I-70 ( Mount Vernon Canyon ) east to Business Loop I-70 / U.S. 40, West Colfax Avenue 2.9 miles 1969
From Business Loop I-70 / U.S. 40, West Colfax Avenue east to Exit 266, SH 72, Ward Road 4 miles 1970
From Exit 266, SH 72, Ward Road east to Exit 267, SH 391, Kipling Street 1.7 miles 1968
From Exit 267, SH 391, Kipling Street east to Exit 269, SH 121, Wadsworth Boulevard 2 miles 1968
From Exit 269, SH 121, Wadsworth Boulevard east to Exit 271, SH 95, Sheridan Boulevard 2 miles 1967
From Exit 271, SH 95, Sheridan Boulevard east to Exit 272, U.S. 287, Federal Boulevard 1 mile July 9, 1966
From Exit 272, U.S. 287, Federal Boulevard east to Exit 274, Interstate 25/U.S. 6-85-87 2 miles December 10, 1965
From Exit 274, Interstate 25 / U.S. 6-85-87 east to Exit 276, SH 2 ( Colorado Boulevard ) 2.6 miles September 12, 1964
From Exit 276, olorado 2 ( Colorado Boulevard ) east to Exit 281, Peoria Street 5 miles 1965
From Exit 281, Peoria Street east to Exit 288, Business Loop I-70 and U.S. 40-287, East Colfax Avenue 7 miles 1966
From Exit 288, Business Loop I-70 and U.S. 40-287, East Colfax Avenue east to Watkins 7 miles 1977
From Watkins to Bennett 9 miles 1963
From Bennett east to Byers 12 miles 1964
From Byers east to Deer Trail 12 miles 1967
From Deer Trail east to Agate 12 miles 1968
From Agate east to West Limon Bypass 19 miles 1963, 1968
West Limon Bypass 3.5 miles 1975
East Limon Bypass 3.8 miles 1975
From East Limon Bypass east to a point west of Genoa 4.2 miles 1975
From a point west of Genoa to a point east of Genoa 4 miles 1975
From a point east of Genoa east to Flagler 24 miles 1975
From Flagler east to Seibert 10 miles 1974
From Seibert east to Bethune 25 miles 1966, 1971
From Bethune to Burlington 8 miles 1967
From Burlington to Kansas State Line 14 miles 1969
Interstate 70 scenes
The Grizzly Creek rest area resides between the elevated lanes of Interstate 70 at milepost 121, and the north banks of the Colorado River. A frontage road connects with the I-70 ramps west to Glenwood Springs and east to Gypsum. 08/11/16
A second set of shields for I-70 direct motorists from the east side of the Grizzly Creek rest area and nearby trail head parking lot. 08/11/16
I-70 trailblazer posted ahead of the eastbound on-ramp from Grizzly Creek. 08/11/16
Partial interchanges lie east of Grizzly Creek at both Shoshone and Hanging Lake. A small guide sign references Exit 125 along the eastbound on-ramp. 08/11/16
Colorado 265 (Brighton Boulevard) north begins at the diamond interchange with Interstate 70 (Exit 265) in the Elyria Swansea neighborhood of Denver. 11/10/03
Chambers Road north at the diamond interchange (Exit 283) with Interstate 70 in northeast Aurora. 04/23/17
Heading south from Montbello in northeast Denver, Chambers Road enters the city of Aurora along a commercialized stretch preceding Interstate 70. 04/23/17
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Interstate 70 enters the city of Denver just west of Chambers Road at Interstate 225. The freeway east continues through Aurora to milepost 300. 04/23/17
Tower Road south at the diamond interchange (Exit 286) with Interstate 70 in east Aurora. Tower Road was formerly Colorado 32 south from I-70 to Business Loop I-70 (Colfax Avenue). 04/23/17

Photo Credits:

11/10/03, 08/11/16, 04/23/17 by AARoads

Connect with:
Interstate 25
Interstate 76
Interstate 225
Interstate 270
U.S. 6
U.S. 36
U.S. 40
U.S. 50
U.S. 85
State Highway 121 - Wadsworth Boulevard

Page Updated 05-09-2017.

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