Missouri Route 370 (Route 370) is a
freeway
A controlled-access highway is a type of highway that has been designed for high-speed vehicular traffic, with all traffic flow—ingress and egress—regulated. Common English terms are freeway, motorway and expressway. Other similar terms ...
that connects
St. Louis County with
St. Charles County
St. Charles County is in the central eastern part of the U.S. state of Missouri. As of the 2020 census, the population was 405,262, making it Missouri's third-most populous county. Its county seat is St. Charles. The county was organized Oct ...
via the
Discovery Bridge over the
Missouri River. The St. Charles County segment of the freeway is signed as the Patrick J. Bray Memorial Highway.
Route description
Route 370 begins in
St. Peters at a
Y-interchange at
I-70
Interstate 70 (I-70) is a major east–west Interstate Highway in the United States that runs from I-15 near Cove Fort, Utah, to a park and ride lot just east of I-695 in Baltimore, Maryland, and is the fifth-longest Interstate in the co ...
exit 224 east of Mid Rivers Mall Drive and proceeds northeast. It loops around Fountain Lakes Park and crosses Cole Creek before turning to a southeasterly direction. It then passes north of
St. Charles and interchanges with
Route 94
The following highways are numbered 94:
International
* European route E94
Australia
* List of road routes in Western Australia#94, National Route 94 in Western Australia
* Burley Griffin Way (New South Wales)
* Dohertys Road (Victoria) (New ...
at exit 7 before crossing the
Missouri River. It then forms a
Parclo interchange
A partial cloverleaf interchange or parclo is a modification of a cloverleaf interchange.
The design has been well received, and has since become one of the most popular freeway-to-arterial interchange designs in North America. It has also be ...
as it interchanges with
Route 141 at exit 9 north of
Earth City
Earth City is an unincorporated community located in St. Louis County, Missouri, United States, along Interstate 70, near the Missouri River. It is bounded by the city of Bridgeton on the east and north, the city of Maryland Heights to the sout ...
as it continues east. The route ends in
Bridgeton, forming another Y-interchange at exits 22A and 22B on
I-270 I-270 may refer to:
* Interstate 270 (disambiguation), one of several highways
* Mikoyan-Gurevich I-270
The Mikoyan-Gurevich I-270 (Design Ж ("Zh") under Mikoyan-Gurevich's in-house designation sequence, USAF/DoD designation: Type 12) was a ...
west of Missouri Bottom Road.
History
Construction on Route 370 began in the early 1990s. It was built to replace the section of St. Charles Rock Road, then designated as
Route 115, west of I-270.
MoDOT applied for an interstate highway designation of Interstate 370, but
AASHTO rejected this in favor of the designation of Interstate 870. MoDOT did not want this because I-870 was their intended designation for what is now
Interstate 255
Interstate 255 (I-255) is a bypass route of I-55 in Greater St. Louis. Along with I-270, it forms a loop around the central portion of the bi-state metro area; a majority of I-255 is located on the Illinois half. It shares its southern te ...
.
On December 16, 1992, the first section of the highway opened allowing direct access to
St. Charles at
Route 94 from I-270. It replaced the crumbling
Old St. Charles Bridge that carried Route 115 traffic. On April 1, 1993, the road was designated as Route 370. In 1993, the
Great Flood of 1993
The Great Flood of 1993 (or Great Mississippi and Missouri Rivers Flood of 1993) was a flood that occurred in the Midwestern United States, along the Mississippi and Missouri rivers and their tributaries, from April to October 1993. The flood wa ...
surrounded much of the highway which is built on top of an
embankment
Embankment may refer to:
Geology and geography
* A levee, an artificial bank raised above the immediately surrounding land to redirect or prevent flooding by a river, lake or sea
* Embankment (earthworks), a raised bank to carry a road, railwa ...
. As the flood waters surrounded the highway, many of the new exits had been shut down because the roads it connected to were underwater. Despite the flood, construction resumed on the highway until it was completed in 1996.
Exit list
See also
*
References
{{Attached KML, display=title,inline
370
__NOTOC__
Year 370 ( CCCLXX) was a common year starting on Friday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Augustus and Valens (or, less frequently, year 1123 '' ...
370
__NOTOC__
Year 370 ( CCCLXX) was a common year starting on Friday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Augustus and Valens (or, less frequently, year 1123 '' ...
Transportation in St. Louis County, Missouri
Transportation in St. Charles County, Missouri
Freeways in the United States