Source: December 31, 2016 Interstate Route Log and Finders List
A short stretch of freeway was open at Independence for U.S. 71 Bypass by 1968. This was incorporated as the north end of I-470.
U.S. 71 Bypass provided a surface route bypass of the Kansas City area. The designation was renumbered as Missouri 291 by 1972. It ran from Harrisonville north to Lee's Summit, Liberty, Nashua and U.S. 71, six miles southeast of Platte City.
A shield for Interstate 470 appeared on the Rand McNally North American Road Atlas first in 1976.
1960s and 1970s era maps showed Interstate 470 proposed in a more northeasterly alignment than what was ultimately constructed over Missouri 291.
The 1981 Rand McNally North American Road Atlas showed Interstate 470 open from the Grandview Triangle east to Missouri 350 at Lee's Summit.
U.S. 50 was relocated onto Interstates 470 and 435, bypassing Kansas City, when the east-west section of I-470 opened. U.S. 50 previously followed Blue Parkway northwest to Swope Parkway, where it combined with U.S. 56 west to Interstate 35 at Merriam, Kansas.
Interstate 470 in Missouri connects southern Kansas City with Independence, providing a bypass of the Kansas City metropolitan area to the southeast and a commuter route to Lee's Summit. The freeway overlaps with U.S. 50 from the Three Trails Crossing Memorial Highway interchange with I-49 and I-435 to Exits 7A/B, and doubles as Missouri 291 on its north-south section between Exits 10 and 16. Old U.S. 50 is designated Missouri 350 between Interstate 470 and Interstate 435 through Raytown and Kansas City.
The state of Missouri submitted Interstate 170, a connector between I-435 and I-70 southeast of Kansas City, as part of the Urban Route Numbering proposals to AASHO on July 31, 1958. The route was changed to Interstate 470 since it constituted a loop and approved by AASHO on November 10, 1958.1
The alignment of Intestate 470 appeared on the Missouri Official Highway Map by 1964 from the Grandview Triangle Interchange with U.S. 71 and I-435 east to then-Bypass U.S. 71 north of Lee's Summit. U.S. 71 Bypass ran north from U.S. 50 to U.S. 40 as part of the planned route. Missouri 291 replaced U.S. 71 Bypass by 1975, with a short stretch of expressway completed by 1969 from south of U.S. 40 to 39th Street. The 1983-84 Missouri Official Highway Map shows the Interstate fully opened to traffic.
The Grandview Triangle Interchange, where I-435, I-470 and U.S. 71 came together in south Kansas City, was redesigned during an eight year project completed in May 2008. The original junction was chronically congested, having been designed when the area was vastly more rural. Suburban growth both along I-435 and U.S. 71 overran the exchange with commuter traffic, leading to the need for the $300 million upgrade. Construction removed some of the left-hand ramps and expanded the freeway mainlines among other improvements. The junction was renamed the Three Trails Crossing Memorial Highway to reflect the end of the Grandview Triangle Interchange era.
A $46-million project between 2006 and June 2010 improved the junction of Interstate 470 with U.S. 50 leading east and Missouri 350 in Lee's Summit. A new split-diamond interchange with Pryor Road and Blue Parkway frames the cloverleaf interchange with the U.S. 50 freeway leading south through Lee's Summit. The new ramps provide local access to the Summit Woods and Summit Fair retail area, reducing traffic on U.S. 50 to the adjacent Chipman Road exit.2
A new diamond interchange opened to traffic along I-470 at Strother Road on August 19, 2010. The $15-million project extended Strother Road and provides additional access to industrial park areas served by Lee's Summit Municipal Airport (LXT).3
Western Terminus - Interstate 435 - southern Kansas City, Missouri
Perspective from Interstate 470 & U.S. 50 west
The initial signs for the Three Trails Crossing Memorial Highway interchange with Interstates 49 and 435 appears ahead of the Blue Ridge Boulevard off-ramp for the Fairlane and Hickman Mills South communities on I-470 & U.S. 50 west. Photo taken 11/03/16.
Interstate 470 & U.S. 50 proceed west with three lanes to the semi directional T interchange with Interstate 49 south & U.S. 71 (Exit 1). Photo taken 11/03/16.
An arrow per lane sign (APL) directs motorists to the left for Interstate 49 & U.S. 71 south to Grandview and Joplin and the Kansas City beltway north toward Independence and Claycomo. Photo taken 11/03/16.
The I-470 mainline continues with three lanes directly to Interstate 435 & U.S. 50 west for Leawood, Overland Park and Lenexa, Kansas. Photo taken 11/03/16.
Historical Perspective from Interstate 470 & U.S. 50 west
An end sign was posted for Interstate 470 west at the original separation of traffic for U.S. 71 south (Exit 1A) and I-435 north / U.S. 71 north (Exit 1B). Exit 1 now applies to the left-hand ramp for Interstate 49 & U.S. 71 south to Joplin. Photo taken by Ben Prusia (2002).
Perspective from Interstate 49 & U.S. 71 north
Interstate 49 & U.S. 71 cross the Kansas City line beyond the forthcoming overpasses for Blue Ridge Boulevard and the KCS Railroad. Back to back ramps follow for Red Bridge Road (Exit 182) and the Three Trails Crossing Memorial Highway interchange with I-435, I-470 and U.S. 50. Photo taken 11/02/16.
Traffic joins I-49 & U.S. 71 north from Blue Ridge Boulevard ahead of the diamond interchange (Exit 182) with Red Bridge Road at the Hickman Mills community of south Kansas City. Two lanes will part ways with the freeway north for a distributor roadway to Interstate 470 & U.S. 50. Photo taken 11/02/16.
Interstate 470 branches east from the Kansas City beltway (I-435) with U.S. 50 to Longview in Kansas City, and Lee's Summit. I-470 turns north beyond the split with U.S. 50 to overlap with Missouri 291 to Independence. Photo taken 11/02/16.
The Three Trails Crossing Memorial interchange upgrade separated traffic to Interstate 470 east and I-435 west onto a distributor roadway. Motorists headed west to Overland Park and Lenexa, Kansas initially join I-470 before its merge with I-435 by the Oakwood area. Photo taken 11/02/16.
Historical Perspective from U.S. 71 north
The rebuild of the Grandview Triangle Interchange expanded the U.S. 71 freeway mainline to eight overall lanes and reconfigured the interchanges with Blue Ridge Boulevard, Longview Road and Red Bridge Road to better separate ingress and egress traffic. This view looks at the northbound freeway prior to roadwork. Photo taken by Eric Stuve (11/30/02).
U.S. 71 continued north from Red Bridge Road with just three lanes to the off-ramp for I-435 west, I-470 east and U.S. 50. This stretch is five lanes wide now. Photo taken by Eric Stuve (11/30/02).
Northbound travelers reached the original Grandview Triangle Interchange with the Kansas City beltway and I-470 loop to Lee's Summit. This interchange was notorious for congestion due to left-hand ramps and weaving traffic. Photo taken by Eric Stuve (11/30/02).
Perspective from Interstate 435 & U.S. 50 east
Interstate 435 & U.S. 50 travel east with four lanes through the six-ramp parclo interchange (Exit 74) with Holmes Road to cross the Blue River and reach the Three Trails Crossing Memorial Highway junction in 2.5 miles. Photo taken 11/03/16.
An auxiliary lane accompanies I-435 east through to the eastbound beginning of Interstate 470. I-470 & U.S. 50 swing southeast from Exit 71A along side the beginning of Interstate 49 to provide part of the connection with the freeway south to Hickman Mills, Grandview and Belton. Photo taken 11/03/16.
Expanding to six eastbound lanes, Interstate 435 sees a left-hand ramp (Exit 71B) for U.S. 71 (Bruce R. Watkins Drive) north to Blue Hills and Ivanhoe in Kansas City while four lanes depart for I-470 & U.S. 50 east to Lee's Summit and I-49 & U.S. 71 south to Joplin. Photo taken 11/03/16.
Traffic partitions as Interstate 435 and U.S. 50 east enter a semi directional T interchange with U.S. 71 (Bruce R. Watkins Drive). I-470 & U.S. 50 east overlap for 6.64 miles to Lee's Summit, where the US highway turns southeast along a freeway to Lake Lotawana. Photo taken 11/03/16.
Historical Perspective from Interstate 435 & U.S. 50 east
The first sign for the eastbound I-435 split with I-470 & U.S. 50 appeared at the Holmes Road (Exit 74) off-ramp to the Linden Hills and Indian Heights communities. Signs were changed here, but the beltway otherwise remains the same today. Photo taken by Eric Stuve (11/30/02).
Advancing toward the Grandview Triangle Interchange along Interstate 435 & U.S. 50 east. This stretch was expanded to six eastbound lanes. Photo taken by Eric Stuve (11/30/02).
Nondescript signs directed motorists to U.S. 71 north (Exit 71B), I-470 & U.S. 50 east and U.S. 71 south (collectively Exit 71A) at the Grandview Triangle Interchange. Replacements added control cities by 2007 as the interchange upgrade progressed. Photo taken by Eric Stuve (11/30/02).
Interstate 435 began its northerly turn from the Grandview Triangle as two lanes departed for I-470 & U.S. 50 east. Exit 71A was reconfigured as I-470 east shifted to a carriageway running along the outside of the Three Trails Crossing Memorial Highway interchange to a new high speed flyover above I-49 & U.S. 71. Photo taken by Eric Stuve (11/30/02).
The former configuration of I-470 & U.S. 50 east at U.S. 71 south (old Exit 1A). Three ramps now serve the freeway east to Lee's Summit while two turn south for both I-49 & U.S. 71 south and the Red Bridge Road off-ramp. Photo taken by Eric Stuve (11/30/02).
Button copy overheads posted along Interstate 435 & U.S. 50 east from when the beltway was just six lanes wide between the Blue River and the Grandview Triangle Interchange. Photo taken by Michael Summa (1984).
Perspective from U.S. 71 south
U.S. 71 (Bruce R. Watkins Drive) advances south to the Bannister Road exit for the Hidden Valley community on the 1.25 mile approach to ramps for I-435 & U.S. 50 east and I-470 & U.S. 50 west. Photo taken 06/19/15.
An unnumbered off-ramp departs for Highway W (Bannister Road) as U.S. 71 continues south with two through lanes to the Three Trails Crossing Memorial Highway. Advance signs omit control cities, a facet of the previous sign specifications. Photo taken 06/19/15.
U.S. 71 expands to three through lanes as Interstate 49 begins. The two routes overlap southward 138 miles to Interstate 44. Grade level ramps meanwhile carry motorists onto I-435 & U.S. 50 west to the Johnson County, Kansas suburbs and I-470 & U.S. 50 east toward Sedalia. Photo taken 06/19/15.
The ramps for Interstates 435 west and 470 east combine with ramps from I-435 south before joining their respective freeway mainlines. Lee' Summit is an eight mile drive to the east. Wichita, Kansas lies 185 miles to the southwest via the Kansas Turnpike. Photo taken 06/19/15.
Perspective from Interstate 470 & Missouri 291 north
I-470 & Missouri 291 lower through a rock cut toward the Little Blue River beyond the first sign for U.S. 40 and Interstate 70 in Independence. Photo taken 06/18/15.
Interstate 470 ends a half mile north of the diamond interchange (Exit 16) with U.S. 40. Like U.S. 69 with Interstate 35, U.S. 40 intertwines or overlaps with Interstate 70 in stages through the Kansas City area. Missouri 291 extends north from the I-470 terminus as a short freeway to 39th Street. Photo taken 10/17/04.
Interstate 470 & Missouri 291 northbound reach Exit 16B for Interstate 70 east. St. Louis is a 227-mile drive across the Show-Me State. Photo taken 06/18/15.
An end sign for Interstate 470 stands between the I-70 off-ramps within the cloverleaf interchange. Traffic continuing northward along Missouri 291 transitions to an at-grade, divided highway to Liberty and Interstate 35 to the north of the Missouri River. Photo taken 06/18/05.
Interstate 70 enters the city limits of Kansas City in five miles and reaches Downtown Kansas City in 14 miles. Photo taken 10/17/04.
Historical Perspective from Interstate 470 north
The first indication that Interstate 470 was about to end. This sign was replaced by 2008 to no longer display Junction. Photo taken 10/17/04.
Replaced end sign for Interstate 470 north beyond the departure of Exit 16B to I-70 east. Photo taken 10/17/04.
Perspective from Interstate 470 & Missouri 291 south
Missouri 291 heads southeast from a commercialized stretch at Missouri 78 to become an expressway leading to Interstates 70 and 470. Photo taken 06/18/15.
Interstate 470 begins as Missouri 291 crosses over Interstate 70 at their full cloverleaf interchange. Photo taken 06/18/15.
Exit 16B loops away from I-470 & Missouri 291 south for Interstate 70 east to Columbia and St. Louis. Photo taken 10/17/04.
Interstate 470 and Missouri 291 are cosigned along the north-south section of the freeway. This is the first shield assembly on southbound. Photo taken 10/17/04.
Perspective from Interstate 70 west
Interstate 70 west straddles the Blue Springs and Independence city line through to the Little Blue River preceding Exit 17. Upcoming I-470 & Missouri 291 south meet U.S. 40 in Independence before crossing into Lee's Summit. Photo taken 10/17/04.
One mile ahead of Exits 15B/A with Interstate 470 south and Missouri 291 on I-70 westbound. Missouri 291 replaced the U.S. 71 Bypass designation from Nashua and Liberty south to Lee' Summit and Harrisonville. I-470 was built directly over a portion of the state highway. Photo taken 10/17/04.
Missouri 291 extends north as a freeway to adjacent 39th Street by Independence Center mall. South from Exit 15A, MO 291 and I-470 overlap for 6.62 miles. Photo taken 11/03/16.
The suburban loop of Interstate 470 leads motorists southwest to I-49 & U.S. 71 near Grandview and I-435 west to Johnson County, Kansas. Photo taken 10/17/04.
Historical Perspective from Interstate 70 west
This sign bridge was replaced during an expansion project to add an auxiliary lane from the Little Blue Parkway on-ramp to the Missouri 291 north off-ramp. Photo taken 10/17/04.
Perspective from Interstate 70 east
Interstate 70 runs between several subdivisions through to the commercialized junction with Interstate 470 and Missouri 291. Independence Center mall and array of shopping centers surround the upcoming exchange. Photo taken 11/03/16.
Exit 15A leaves I-70 east for I-470 & Missouri 291 south to Fleming Park and Lee's Summit. Photo taken 11/03/16.
Interstate system route numbering web site http://www.nwindianahwys.homestead.com/INTER_MAIN.HTML, Stephen Summers.
"I-470 interchange in Lee's Summit is done." The Kansas City Star, June 30, 2010.
"Ceremony to open new interchange at I-470 and Strother Road in Lee's Summit." The Kansas City Star, August 19, 2010.