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Interstate 44 and Viaduct Street Interchange Project

-Project Map displayed at public hearing in July 2006

-I-44 & Viaduct Street Interchange maps
*All three construction phase maps are shown. Clicking on a map will bring up a series of smaller maps that can again be clicked for greater detail. The various construction phases are described on this page.

What Improvements are Needed at the I-44 & Viaduct Street Interchange?
The south side ramps that intersect Osage Street are too close to Viaduct Street, causing congestion and making it very difficult for vehicles to access the interchange. Osage Street on the south side of the interchange and the outer road on the north side of the interchange are also very congested, which prevents traffic from traveling freely through the interchange.

I-44 ramp

The new eastbound Interstate 44 exit ramp at Pacific.

What Is The Solution?

MoDOT is relocating the eastbound ramps at the I-44 and Viaduct Street interchange to the west of the existing interchange. This will provide more separation between I-44 and the south outer road and improve access to and from the interchange. Osage Street has been widened to five lanes between Lamar Parkway and Payne Street.

In order to improve congestion and safety on the north outer road (Hogan Street), MoDOT is proposing to construct a roundabout on the north side of the interchange. Thornton Street, Hogan Street, Viaduct Street and the ramps to and from westbound I-44 will converge at the roundabout. A roundabout is a one-way circular intersection where vehicles move in a counter-clockwise direction and all entering traffic yields to traffic already in the roundabout. Roundabouts reduce driver delay by allowing motorists to yield rather than stop. Accidents also decrease because conflict points (spots where vehicles could collide) are minimized and speed is lower compared to signalized intersections.


Estimated construction cost:
(Phases 1-3) to improve the I-44 and Viaduct Street interchange: $35 million

Phase 1 construction is complete

  • The first phase was awarded to Millstone, Bangert, Inc. for $21.7 million.

Phase 2 construction is near completion, ahead of schedule.

  • The second phase consisted of reconstructing the south half of the Viaduct Street interchange by relocating the eastbound Interstate 44 ramps approximately one half mile west of Viaduct Street. Crews also widened Osage Street from west of Lamar Parkway to east of Payne Street.

  • This phase of the project is a cost-share partnership between MoDOT and the City of Pacific, awarded to N.B. West Contracting for approximately $7.4 million, which is funded by Amendment 3 (approved by Missouri voters in November 2004).

  • Construction began in July 2009 and is expected to be complete in late December 2010, which is a few months ahead of schedule.

Phase 3 construction is currently not funded.

  • The third phase proposes to construct the north half of the interchange, the westbound I-44 ramps and roundabout.


Osage Street was widened from west of Lamar Parkway to east of Payne Street during Phase 2 of construction.

Who do I contact for more information?

Contact MoDOT Area Engineer Judy Wagner at 1-888 ASK MODOT (275-6636) or e-mail Judy.Wagner@modot.mo.gov

Contact MoDOT Resident Engineer Tim Hellebusch at 1-888 ASK MODOT (275-6636) or e-mail Tim.Hellebusch@modot.mo.gov

Contact MoDOT Community Relations Specialist Kara Price at 1-888 ASK MODOT (275-6636) or email Kara.Price@modot.mo.gov

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