Interstate 70

Interstate 70

Infobox road

length_ref=cite web |url=|title=Route Log- Main Routes of the Eisenhower National System of Interstate and Defense Highways - Table 1|accessdate=2007-02-07|format=|work=Federal Highway Administration]
established=1956 (completed in 1992)
junction= Jct|state=CO|I|25 in Denver, CO
terminus_b=Jct|state=MD|MD|122 in Baltimore, MD

Interstate 70 (I-70) is an interstate highway in the United States that runs from Interstate 15 near Cove Fort, Utah, to a Park and Ride in Baltimore, Maryland. It was the first Interstate Highway Project started in the United States. I-70 approximately traces the path of U.S. Route 40 (and also the old National Road) east of the Rocky Mountains. West of the Rockies, the route of I-70 was cobbled together from a variety of sources.

The construction of I-70 in Colorado and Utah is considered an engineering marvel where the route passes through the Eisenhower Tunnel, Glenwood Canyon, and the San Rafael Swell. The Eisenhower Tunnel is the highest point along the Interstate highway system with an elevation of ft to m|11158|abbr=yes.

The sections of the interstate in Missouri and Kansas have laid claim to be the first interstate in the United States.cite web
url =
title = Eisenhower Interstate System
accessdate = 2007-01-30
publisher = Eisenhower Presidential Library and Museum
] The final piece of Interstate 70 was opened to traffic at Glenwood Canyon in 1992. Most people considered this to be the last piece of the Interstate Highway System as originally planned to be opened.

Route description



Interstate 70 begins at an interchange with Interstate 15 near Cove Fort. Heading east, I-70 crosses between the Tushar and Pahvant Ranges via Clear Creek canyon and decends into the Sevier Valley where I-70 serves Richfield, the only town of more than a few hundred people along I-70's path in Utah. Upon leaving the valley near Salina I-70 crosses convert|7923|ft|m|abbr=on Salina Summit and then crosses a massive geologic formation called the San Rafael Swell.

Prior to I-70's construction the swell was relatively undiscovered and inaccessible via paved roads. Once this mi to km|108|abbr=yes section was opened to traffic in 1970, it became the longest stretch of interstate highway with no services and the first highway in the U.S. built over a completely new route since the Alaska Highway.cite web
url =
title = Interstate 70
accessdate = 2007-01-30
publisher = Utah Highways (personal site)
] It also became the longest piece of interstate highway to be opened at one time. Although opened in 1970, this section was not formally complete until 1990 when a second steel arch bridge spanning Eagle Canyon was opened to traffic.Since I-70's construction the swell has been discovered for its desolate beauty. The swell has since been nominated for National Park and/or National Monument status on multiple occasions. If the swell is granted this status it arguably would be the first time a National Park owes its existence to an interstate highway. Most of the exits in this span are view areas, brake check areas, and Runaway truck ramps with few traditional freeway exits.

I-70 exits the swell near Green River. From Green River to the Colorado state line I-70 follows the southern edge of the Book Cliffs.


Entering from Utah, I-70 descends into the Grand Valley where it meets the Colorado River, which provides its path up the western slope of the Rocky Mountains. Here I-70 serves the Grand Junction metro area before traversing more mountainous terrain. It passes through the 15 mile (24 km) section of I-70 through Glenwood Canyon, which was the last section of I-70 to be completed. This stretch was completed in 1992 and was an engineering marvel due to the extremely difficult terrain and narrow space in the canyon, which requires corners that are sharper than normal Interstate standards. Construction was delayed for many years due to environmental concerns. The difficulties in building the road in the canyon were compounded by the fact that a railroad occupied the south bank and many temporary construction projects took place to keep U.S. Route 6 open, at the time the only east-west road in the area. Much of the highway is elevated above the Colorado River. The speed limit in this section is 50 mph (80 km/h) due to the limited sight distance and sharper corners. Great care was taken to not destroy the local ecosystem with the building of the road. All rest areas through this stretch use reclaimed water.

The Eisenhower Tunnel, the highest vehicular tunnel in the world and the longest tunnel built under the Interstate program, passes through the Continental Divide. Because of the Eisenhower Tunnel's existence, I-70 is one of few roads connecting ski resorts such as Keystone and Aspen with Denver and it is more likely to be open than alternative roads. After traversing the mountainous terrain, I-70 goes through Denver and intersects Interstate 25. Leaving Denver, I-70 traverses through wide plains through east central Colorado before exiting into Kansas.

A section of the highway is displayed in the video game Syphon Filter 2 as an escape route for the protagonist.

Bicyclists are permitted to use the shoulder lane of I-70 in portions of Colorado; this is one of the few sections of Interstate Highway where non-motorized vehicles are permitted to use the road.

When leaving the Rocky Mountains, the Denver skyline can be seen on a clear day. This can fool truckers and other unsuspecting drivers because there is still over convert|10|mi|km of steep grade road before reaching the city. A series of signs warn truckers of the steep grade.


Coming from Colorado, I-70 enters flat plains in Kansas. This portion of I-70 was the first segment to start being paved and to be completed in the interstate system. It is given the nickname "Main Street of Kansas" as the interstate extends from the Western border to the Eastern border covering convert|424|mi|km and passing through most of the state's principal cities in the process.

, the longest "spur" route in the Interstate system [cite web| url=|title=Shortest and longest 3-digit interstates] , forming the latter's northern terminus.

In Topeka, I-70 intersects I-470, twice. At the eastern intersection, the Kansas Turnpike merges, making I-70 into a toll road. This is one of only two sections of I-70 that are tolled. (The other is part of the Pennsylvania Turnpike.) I-70 carries this designation from Topeka to Bonner Springs, the eastern terminus of the turnpike. There is also a third child route in Topeka, I-335, which runs from I-470 south to meet up with I-35 in the Flint Hills town of Emporia. Just past the Bonner Springs Toll Plaza I-70 crosses I-435 for the first time, which allows travelers to bypass the downtown traffic via I-435, which encircles the Kansas City metropolitan area. Further down the highway in Kansas City, Kansas, approximately convert|3|mi|km before the 18th Street Expressway, I-70 is intersected again by another child route. This route, I-635, runs from I-35 at its southern terminus up to I-29, just about convert|5|mi|km across the Missouri river, at its northern terminus. From I-635 to just past the 7th Street (US 169) exit, I-70 runs adjacent to the second largest rail yard in the United States (only the Chicago rail yard is larger). Here I-670 (also designated "Alternate 70" on some signs) diverges, providing a more direct route that rejoins I-70 proper a few miles east in Missouri. The highway passes over the former stockyards and rail yard when it crosses the Kansas River on the Lewis & Clark Viaduct into downtown Kansas City, Missouri.


After crossing the Lewis & Clark Viaduct, I-70 enters Missouri. It encounters a loop of freeways, called the Alphabet Loop, which contains I-70 as well as I-35, I-670, U.S. 24, U.S. 40, U.S. 71, and U.S. 169. In the southern part of this loop, I-670 cuts directly through the downtown while I-70 bypasses the taller buildings a few blocks north near the Missouri River. Westbound I-670 is also designated Alternate I-70 making this the only permanent "alternate" interstate in the country. Most of the interstates in this loop are in their second mile, so all exits (no matter the which interstate carries the road) are numbered 2 and suffixed with every letter of the alphabet except I, O and Z.

The section of I-70 in Downtown Kansas City is approximately the southern city limits of "City of Kansas" when it was incorporated in 1853. The first two auto bridges in Missouri mark the city's original boundaries with the Broadway Bridge (Kansas City) (U.S. Route 169) being the west boundary while the Heart of America Bridge (Route 9) is the east boundary. Another intersection of note is the second traverse of I-435. This is primarily notable because it immediately precedes the Truman Sports Complex (home of both Arrowhead Stadium and Kauffman Stadium) and also because the entrance ramps from I-435 northbound onto I-70 eastbound also serve as the exit ramps from I-70 into the Truman Sports Complex parking lots. This section of the Interstate is marked as the "George Brett Super Highway", named after the Kansas City Royals third baseman who played the entirety of his career (1977-1993) at "The K". The last interstate intersection in the immediate Kansas City metro area is with I-470 in Independence.

After passing Kansas City, I-70 traverses the length of Missouri, west to east. It passes through the largest city between Kansas City and St. Louis, Columbia, which is about halfway between the two major cities, and the home of the University of Missouri. The terrain is rolling with some hills and bluffs near rivers. I-70 also crosses the Missouri River twice (as did the original US 40)--at Rocheport, about convert|15|mi|km west of Columbia, and at St. Charles, about convert|20|mi|km northwest of St. Louis. Most of the highway on this stretch is four-lane. Various proposals have been made to widen it (at an estimated cost of $3.5 billion) including turning it into a toll road.cite news
title = Missouri official calls for rebuilding I-70
publisher = Kansas City Business Journal
date=8 Feb. 2006
url =
accessdate = 2007-01-30
] I-70 eventually gets into the St. Louis metro area and U.S. Route 40 splits to the south, along with U.S. Route 61, which does not have a concurrency with I-70. The intersecting road will be upgraded to Interstate standards because of the upgrade to Interstate 64.cite web
url =
title = Route 40/61 Corridor Projects
accessdate = 2007-01-30
publisher = Missouri Department of Transportation
] After this interchange, I-70 intersects two child routes, I-270 and I-170. I-70 then heads into the city limits of St. Louis, designated "The Mark McGwire Highway" after the Cardinals former first baseman (1997-2001), who hit 70 home runs in 1998 to break the single season record set by Roger Maris in 1961, allowing the number 70 to take on greater significance in St. Louis. It continues south to intersect with I-64, U.S. 40, and I-55, which then become concurrent as they head east to cross the Mississippi River on the Poplar Street Bridge.

The 1985 World Series between the Kansas City Royals and St. Louis Cardinals was nicknamed the "I-70 Series" because St. Louis and Kansas City are the two endpoints of I-70 in Missouri and the highway passed both Busch Stadium and Royals Stadium.


After crossing the Poplar Street Bridge, I-64 splits off, while I-55 and I-70 stay concurrent. When they intersect I-270, I-55 stays on its own pavement using the mileposts from the Poplar Street Bridge, while I-70 heads east on I-270's pavement using I-270's mileposts. So when I-55/70 intersects I-270 from the southeast, the exit numbers would be 20 A/B, whereas if I-70 intersects I-55/270 from the east, it would be exits 15 A/B.

I-70 does not pass through any major cities in Illinois. It does run concurrent with Interstate 57 around Effingham. I-70 then proceeds east towards Indiana.


I-70 enters Indiana west of Terre Haute. The only major city is Indianapolis. Interstate 65 can be accessed from downtown, while the other Interstates in the city, Interstate 74 and 69, must be accessed from Interstate 465, the beltway around the city. After passing through, it continues east through eastern Indiana before exiting into Ohio in Richmond, with U.S. Route 35.


Interstate 70 enters Ohio just east of Richmond, Indiana. Immediately after crossing into Ohio, eastbound travelers are greeted by a unique teal-blue arch that spans the width of the freeway, with a "Welcome to Ohio" sign above the eastbound lanes. A sign thanking travelers for visiting Ohio is mounted on the other side of the arch for westbound travelers. Continuing eastbound, I-70 intersects Interstate 75 north of Dayton, followed by I-675 on the east side of Dayton. Springfield is the next city, site of Buck Creek State Park.

I-70 then encounters the largest city in Ohio, Columbus. Columbus is bounded by I-270, and is roughly centered around the intersection of I-70 and Interstate 71, which share the same asphalt through a notoriously congested convert|1.5|mi|km|sing=on stretch locally known as the "South Innerbelt" or, more commonly, "The Split." The Split will be reconstructed within the next few years. Interstate 670 connects Port Columbus International Airport with I-270, I-71, and I-70. East of Columbus, I-70 passes through Zanesville and on to Cambridge, where it intersects Interstate 77. Continuing on towards West Virginia, I-70 intersects Interstate 470 just east of St. Clairsville. I-470 is primarily used for through traffic, as it is actually shorter to travel I-470 through Wheeling than to continue on I-70.

In March 1995, a hole (from a former coal mine) opened up on the eastbound side of I-70 in Guernsey County near Old Washington, causing traffic to be rerouted onto US 40 between Old Washington and Cambridge for several months.

West Virginia

The portion of I-70 in West Virginia crosses the Ohio River at Wheeling and runs through the Wheeling Tunnel. I-70 has only one through lane in each direction at the tunnel. A major interchange was planned but never completed on the east side of the Wheeling Tunnel. Upon merging with I-470, I-70 goes uphill towards Dallas Pike, West Virginia, This part of the road is called "Two Mile Hill", which is known locally for the many accidents at the bottom of the hill. I-70 has brought major development in Ohio County, the only county the route passes through in West Virginia, in the past few years. On the north side of the highway a former strip mine is being developed into a retail area called "The Highlands". This stretch of Interstate 70 is the shortest I-70 is in any state, traveling only convert|15|mi|km from the Ohio River to the Pennsylvania border.


I-70 went through Pittsburgh, Pennsylvania at one point; its original route has been incorporated into I-376, as well as parts of I-76, I-279 and I-79.

I-70 also overlaps I-79 near Washington, Pennsylvania for convert|3|mi|km.

The 38 miles (61 km) of I-70 between Washington, Pennsylvania and New Stanton, Pennsylvania is a sub-standard section of the highway. This section of I-70 used to be Pennsylvania Route 71. It is characterized by sharp curves, limited sight distance, narrow shoulders, and lack of merge lanes at interchanges. Traffic on clover leaf ramps must weave in the right through lane of traffic due to the lack of a third lane for entering and exiting traffic. Other on and off ramps effectively function as RIRO, making for a nervewracking entrance if traffic is approaching. The speed limit on this stretch is 55 mph (90 km/h)

From New Stanton to Breezewood, I-70 overlaps I-76 and the Pennsylvania Turnpike. This is one of two tolled sections of I-70 (the other being in Kansas, where the portion of the Kansas Turnpike east of Topeka is signed I-70).

Drivers on I-70 near Breezewood, Pennsylvania have to leave the freeway and travel a few blocks on US 30 past several traffic lights before returning to the freeway. [Manuel Roig-Franzia, "The Town That Stops Traffic: Travelers Encounter Way Station as Way of Life in Breezewood," "Washington Post", 22 November 2001, B1.] This stretch of I-70 is one of the few gaps on the Interstate Highway System.


In Maryland, Interstate 70 runs horizontally from the Pennsylvania state line near Hancock east across the central portion of the state towards Baltimore, following the route of the National Road, now known as U.S. 40. It is the major east-west highway in the state, serving the cities of Hagerstown and Frederick and bypassing Ellicott City; east of Frederick, the route was originally designated Interstate 70N. The route serves Washington D.C. via Interstate 270, which was once designated Interstate 70S. Uniquely, Interstate 70 indirectly serves a branch of the Washington Metro at Shady Grove via Interstate 370, which only connects to Interstate 270.

I-70 was planned to end at Interstate 95 in [ Baltimore] , but due to local opposition, it was only built to Maryland Route 122 (see History below). The pavement that was supposed to be part of the route to Baltimore is now a Park and ride in Southwest/West Baltimore (City line at Exit 94).


Besides being the first Interstate signed into law,Fact|date=October 2007 other oddities happened with I-70 as well:

Western terminus

As first proposed, the western terminus of I-70 was Denver, Colorado. Utah and Colorado pressured the federal government to extend the plans for I-70 farther west, arguing that a direct link between Denver, Colorado and Salt Lake City, Utah was vital for an effective highway system. The proposal was to follow what is now U.S. Route 6 west and connect to I-15 at Spanish Fork, Utah. Federal planners (influenced by the military) agreed to extend the proposed route of I-70, but not to serve Salt Lake. The military wanted to better connect southern California with the North Eastern U.S. This led to I-70's constructed route through the San Rafael Swell and terminating at Cove Fort. Many motorists include I-70 as part of their cross-country drives between New York City and Los Angeles (which are accessible to I-70 via other interstates).cite web
url =
title = Ask the Rambler: Why Does I-70 End in Cove Fort, Utah?
accessdate = 2007-01-30
publisher = Federal Highway Administration

Eastern terminus

As a result of freeway revolts in the Baltimore area, Interstate 70 was not completed east of Maryland Route 122 to its planned terminus on Interstate 95 within the city of Baltimore, and for all intents and purposes, ends at a four-way symmetrical stack interchange with Interstate 695, the Baltimore Beltway.


The highway gave its name to the "I-70 Killer," a serial killer who committed a string of murders within a few miles of it in several Midwestern states in the 1980s. No suspect has ever been apprehended despite the widespread publicity the murders have generated, including their being featured several times on the television show "America's Most Wanted".

The 1985 World Series was a contest between the St. Louis Cardinals and the Kansas City Royals. As these cities are primarily connected by Interstate 70, this World Series was often referred to as the "I-70 Series" in the media.

Major intersections

*Interstate 15 in Cove Fort, Utah
*Interstate 76 in Arvada, Colorado
*Interstate 25 in Denver, Colorado — the Mousetrap
*Interstate 225 in Aurora, Colorado
*Interstate 135 near Salina, Kansas
*Interstate 435 near Bonner Springs, Kansas
*Interstate 635 in central Kansas City, Kansas
*Interstate 35 in Kansas City, Missouri (concurrent between exits 2A and 2H)
*Interstate 29 in Kansas City, Missouri. I-29 Begins/Ends at this downtown interchange
*Interstate 435 east of Kansas City, Missouri
*Interstate 470 in Independence, Missouri
*Interstate 44 in St. Louis, Missouri
*Interstate 55 in St. Louis, Missouri. They stay joined until Troy, Illinois.
*Interstate 64 in St. Louis, Missouri. They stay joined until East Saint Louis, Illinois.
*Interstate 255 west of Collinsville, Illinois
*Interstate 57 in Effingham, Illinois (concurrent for 6 miles (10 km))
*Interstate 74/Interstate 465 on the west side of Indianapolis, Indiana
*Interstate 65 in Indianapolis, Indiana (concurrent for 2 miles (3 km))
*Interstate 465 on the east side of Indianapolis, Indiana
*Interstate 75 in Dayton, Ohio
*Interstate 675 between Springfield, Ohio and Dayton, Ohio
*Interstate 71 in Columbus, Ohio (concurrent for 2 miles (3 km))
*Interstate 77 in Cambridge, Ohio
*Interstate 79 in Washington, Pennsylvania
*Interstate 76 in New Stanton, Pennsylvania. They stay joined until Breezewood, Pennsylvania (approximately 88 miles (142 km)). While concurrent, they are part of the Pennsylvania Turnpike; thus, this is a tolled section of both Interstates.
*Interstate 99 in Bedford, Pennsylvania
*Interstate 68 in Hancock, Maryland
*Interstate 81 in Hagerstown, Maryland
*Interstate 695 near Baltimore, Maryland

Auxiliary routes

I-70 has one of the closest distances between two distinct child interstates with the same child interstate number. I-470 near Topeka, Kansas and I-470 on the east side of Kansas City, Missouri are approximately convert|72|mi|km apart.

A breakdown about all of I-70's spur routes are below:
*I-270 is a short connector between I-70 and I-25 in Denver, Colorado.
*I-470 is a loop around the south side of Topeka, Kansas.
*I-670 is an alternate route of I-70 in Kansas City, Kansas and Kansas City, Missouri.
*I-470 is a connector between I-70 and I-435 in southeastern Kansas City and Independence, Missouri.
*I-170 is a connector between I-64 and I-270 in St. Louis County, Missouri.
*I-270 loops around St. Louis city and county. It is supplemented by I-255 to the east.
*I-270 is a beltway around Columbus, Ohio.
*I-670 is a short connector between I-70 and I-270 in eastern Columbus that provides direct access to Port Columbus International Airport from downtown Columbus.
*I-470 is a southern bypass around Wheeling, West Virginia.
*I-270 is a spur to Washington, D.C.. It was formerly designated I-70S.
*I-370 is a spur to Gaithersburg and Rockville, Maryland from I-270. It never connects to I-70.
*I-170 was to have been a spur into downtown Baltimore, Maryland, but the short part that opened never connected to I-70 or to any other Interstate highway. It was decommissioned in 1989, and US 40 is the current designation for the freeway.


* Rob Hiaasen, "Go west, young man: Like Horace Greeley’s famed advice, curious sign on I-70 beckons yonder," "Baltimore Sun", June 4, 2007, "available at",0,2235720.story

External links

=Information and

* [ Illinois Highway Ends: Interstate 70]
* [ Indiana Highway Ends: Interstate 70]

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