Interstate 170 South

Traveling south from the directional interchange with Interstate 270, Interstate 170 heads one mile to a diamond interchange with Airport Road. The next two exits lie within the city of Berkeley.

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The first shield of Interstate 170 south precedes the Frost Avenue underpass.

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Exit 9A departs in one half mile for Airport Road. Airport Road heads west to James S. McDonnell Boulevard on the north side of St. Louis Lambert International Airport to the west while Interstate 170 meets its parent just southeast of the airport at Exits 7B/A.

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Interstate 170 spans a Norfolk Southern Railroad and merges with a left side on-ramp from a Boeing plant as Exit 9A leaves from the right. Airport Road west serves Boeing while eastbound heads to the city of Ferguson.

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One mile north of the directional interchange with Interstate 70 on I-170 south. I-70 joins St. Louis with Kansas City as part of a 250 mile course across Missouri.

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Scudder Road joins Interstate 170 with south Berkeley and nearby Kinloch in one half mile at Exit 8.

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Heavy rain from an isolated thunderstorm falls as Interstate 170 reaches the Exit 8 ramp departure to Scudder Road. Scudder Road is a local road connecting I-170 with adjacent James S. McDonnell Boulevard by the airport to the west and Mable Avenue in Kinloch to the east. Interstate 170 continues a half mile south to separate ramps (Exits 7B/A) to Interstate 70, where the freeway briefly reduces to two southbound lanes.

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Runway lights appear above Interstate 170 beyond this interchange sequence sign posted one quarter mile out from Interstate 70. I-170 straddles the St. John and Bel Ridge city line beyond I-70 with interchanges at Natural Bridge Road (Exit 6) and St. Charles Rock Road (Exit 5).

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Two lanes leave Interstate 170 south for Interstate 70 west to STL Airport, Bridgeton, St. Charles, Columbia and Kansas City.

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A left side ramp follows as Exit 7A onto the left side of Interstate 70 east to Normandy, Jennings and downtown St. Louis.

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Passing under the Interstate 70 mainline, a Metrolink line, and a pair of flyovers linking the two freeways.

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A folded diamond interchange (Exit 6) joins Interstate 170 with Missouri 115 (Natural Bridge Road) at Bell Ridge and St. John next.

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Exit 6 loops away from I-170 south onto Missouri 115. Highway 115 follows Natural Bridge Road west to Exit 237A of I-70 by STL Airport and east to Bellerive, Normandy, Pine Lawn and an end at Exit 248A of I-70 in St. Louis.

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The fourth southbound lane of Interstate 170 defaults into the single point urban interchange (SPUI) with Missouri 180 (St. Charles Rock Road).

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Interstate 170 winds southwest from Charlack through Overland, Olivette and University City over the next 2.75 miles. Interchanges with Page Avenue (Highway D) and Missouri 340 (Olive Boulevard) serve the three cities from I-170.

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Missouri 180 (St. Charles Rock Road) constitutes a 10.6 mile route northwest from the St. Louis city line at Wellston to end at Interstate 270 in Bridgeton.

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Continuing south, a diamond interchange (Exit 4) joins Interstate 170 with Page Avenue (Highway D) in three quarters of a mile.

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Page Avenue heads east from Exit 4 by a large industrial park through Vinita Park to Pagedale, Wellston and the West End and Hamilton Heights neighborhoods of St. Louis.

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Southbound at the Exit 4 off-ramp to Page Avenue. Highway D follows Page Avenue west from St. Louis through Overland and Maryland Heights to become Missouri 364 (Page Avenue Extension), a freeway linking I-270 with St. Charles.

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Missouri 340 (Olive Boulevard) meets Interstate 170 at a single point urban interchange (Exit 3) in one half mile on the east side of Olivette.

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Construction converted Exit 3 from a parclo interchange to a SPUI in 2007. This eliminated weaving traffic movements on I-170 southbound between the ramps to Olive Boulevard. Missouri 340 otherwise comprises a divided highway east to Ferguson Avenue in east University City.

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Two lanes carry motorists to Missouri 340 (Olive Boulevard) at Exit 3 of Interstate 170 south. Missouri 340 ventures west to Creve Coeur, Chesterfield and Ellisville to complete a 19.5 mile loop at Missouri 100.

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The first stretch of then-Missouri 725 to open was the portion of freeway south from Olive Boulevard to U.S. 40 at Richmond Heights. The six lane freeway sees exits with Delmar Boulevard in south University City and Ladue Road in Ladue over the next mile.

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Delmar Boulevard is an east-west arterial between Price Road in Olivette to the west to the Central West End section of St. Louis.

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The last two mainline exits of Interstate 170 serve the city of Clayton to the east. Ladue Road meets the freeway at a folded diamond interchange (Exit 1F) in one quarter mile.

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Ladue Road east becomes Maryland Avenue at the Clayton city line, leading to Downtown. West from Exit 1F, Ladue Road continues through north Ladue to Creve Coeur and Interstate 270, where the road becomes Highway AB.

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Reassurance marker posted along Interstate 170 south as the freeway crosses into Clayton.

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Forest Park Parkway begins an eastward trek from a trumpet interchange (Exit 1E) with Interstate 170 next as the freeway enters its final mile.

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Exit 1E parts ways with Interstate 170 south for Forest Park Parkway east by Downtown Clayton to Washington University in St. Louis and Forest Park in the city of St. Louis.

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The final shield assembly for Interstate 170 follows on-ramp from Forest Park Parkway west.

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Exit 1D departs in one quarter mile for Brentwood Boulevard south ahead of Clayton Road and St. Louis Galleria mall. The first guide sign for I-64/U.S. 40 (Exits 1A/B) appears at 0.75 miles out.

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Brentwood Boulevard heads south from Charles A. Shaw Park and Downtown Clayton to cross paths with Interstate 170 at Exit 1D. The commercial arterial continues south along the final half mile of I-170 through Richmond Heights to Brentwood.

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Three lanes of Interstate 170 south prepare to split three ways. Exits 1A/B join I-64/U.S. 40 west to Wentzville and east to downtown St. Louis. Exit 1C provides access to Brentwood Boulevard south of the St. Louis Galleria via a connection with the westbound off-ramp of I-64/U.S. 40 while also serving the freeway end at Eager Road and the Promenade at Brentwood shopping center.

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Interstate 170 passes over Clayton Road and enters the city of Richmond Heights. The Richmond Heights Metrolink station appears along the east side of the freeway here.

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A formal end sign precedes the ramp partition of Exits 1ABC. Original proposals for the Inner Belt extended the freeway south to Interstate 44 at Webster Groves or Maplewood. This concept was never built due to social and economic costs.

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Exit 1C parts ways with Interstate 170 south to Eager Road, an arterial paralleling I-64/U.S. 40 east between Brentwood Boulevard and Hanley Road. Single lane flyovers prepare to separate for I-64/U.S. 40 west to Ladue, Town and Country and Chesterfield and east through Richmond Heights to Forest Park and Midtown in St. Louis.

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A parclo interchange joined Interstate 170 and U.S. 40 historically. That interchange was replaced with a directional stack interchange during 2008-09.

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I-64/U.S. 40 share pavement from the Poplar Street Bridge across the Mississippi River 31 miles west to Wentzville, where I-64 ends at Interstate 70.

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Shields accompany the ramp partition of Exits 1A/B. Interstate 64 was extended west through St. Louis to Interstate 270 in 1987. U.S. 40 preceded the route as an expressway in the 1950s. Because of the age of the route, it was closed and rebuilt during a two-stage shutdown in 2008/09.

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Curving eastward above the six lane I-64/U.S. 40 freeway along the Exit 1A flyover to Downtown St. Louis.

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