Missouri 370 West

Branching northwest from Interstate 270, Missouri 370 passes under a Norfolk Southern Railroad line on the 0.75 mile approach to St. Louis Mills Boulevard (Exit 11).

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The right lane defaults to the off-ramp (Exit 11) to St. Louis Mills Boulevard at St. Louis Outlet Mall.

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Entering the folded diamond interchange with St. Louis Mills Boulevard at Hazelwood. Taussig Avenue extends the boulevard west into Bridgeton by the Bridgeton Municipal Athletic Complex.

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Turning westerly, Missouri 370 next meets the north end of Missouri 141 (Earth City Expressway) at a parclo interchange (Exit 9) in one mile.

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Missouri 141 travels 30.90 miles south from Exit 9, opposite Missouri Bottom Road, through Maryland Heights, Town and Country and Manchester among other St. Louis County suburbs to end at U.S. 61/67 in Arnold. The state highway was extended north over both the Maryland Heights and Earth City Expressways in July 2012.

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Missouri 94 (North 3rd Street) in St. Charles represents the next westbound exit in one mile.

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Rising to span the Missouri River, Missouri 370 parallels the Wabash Bridge, which carries a Norfolk Southern Railroad line. The cantilever bridge opened in 1936.¹

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A pair of truss bridges carry motorists across the Missouri River along Missouri 370. Opened on December 16, 1992, the Discovery Bridge is 3,455 feet long.²

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Midway across the Missouri River, westbound motorists enter St. Charles City and County.

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Continuing through the superstructure, the Discovery Bridge accommodates six overall lanes with full shoulders in each direction. The bridge is also part of the Mississippi River Trail bicycle route.

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Exit 7 is the first of three interchanges for the city of St. Charles on Missouri 370 west. Missouri 94 joins the freeway with Downtown via a route along 3rd Street, Tecumseh Street and 2nd Street.

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Two lanes loop away from Missouri 370 west for Missouri 94. Missouri 94 enters St. Charles from a rural route originating at U.S. 67 in West Alton. The state highway goes for 136.31 miles to Jefferson City.

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Reassurance marker posted for Missouri 370 west of the Mel Wetter Parkway overpass. Little Hills Expressway parallels the north side of the freeway to Mueller Road.

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This interchange sequence sign outlines the final three interchanges of Missouri 370 to Salt River Road (Exit 1B). The freeway opened in stages from a temporary end at Mueller Road west to Elm Street in November 1994, to Truman Boulevard in July 1996 and to I-70 in November 1996.

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One half mile out from the diamond interchange (Exit 5) with Elm Street south and New Town Boulevard north on MO 370 west. The freeway spans Elm Point Industrial Drive at this overhead.

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Elm Street meanders southeast from a commercialized stretch at Exit 5 to residential areas of central St. Charles. New Town Boulevard continues the route north by Fountain Lakes Commerce Center to Highway B outside the city.

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Missouri 370 bends again and traverses agricultural land to its end at Interstate 70.

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Truman Boulevard north and Lakeside Park Drive come together at a diamond interchange (Exit 2) in one mile. 3.25 miles of MO 370 west remain.

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Lakeside Park Drive connects Missouri 370 and Truman Boulevard with 370 Lakeside Park, a 300-acre facility opened on May 19, 2011.

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South from Exit 2, Truman Boulevard expands into a five lane arterial through west St. Charles. The boulevard transitions into Cave Springs Road at Interstate 70.

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Next in line for westbound motorists along Missouri 370 is the wye interchange (Exit 1B) with Salt River Road west.

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Passing by the last shield for Missouri 370, motorists enter the city of St. Peters from Exit 2 westward.

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A directional T interchange concludes Missouri 370 west with Interstate 70 in 1.25 miles.

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Salt River Road spurs west from Exit 1B through northern reaches of St. Peters to Highway C and the Missouri 79 expressway at O'Fallon.

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Two lanes depart Missouri 370 west as the freeway curves southward for the final approach to Interstate 70.

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Missouri 370 spans both Premier Parkway and a Norfolk Southern Railroad line on the final half mile. An end sign precedes Exit 1A to I-70 east.

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Interstate 70 crosses St. Peters from O'Fallon and Wentzville to the west and St. Charles and the Blanchette Bridge to the east.

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Missouri 370 west defaults onto Interstate 70 toward Columbia and Kansas City, concluding its role as a through route bypass of St. Charles from I-270 west.

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Exit 1A is a flyover joining I-70 east back toward St. Louis. I-70 west remains suburbanized to Wentzville.

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