I-70 Fifth St. Improvements and I-70 Route K Construction

The Interstate 70 (I-70) corridor is our front door to the region, state and nation; however, looks and feels like any other interstate service corridor. We can continue with business as usual and hope for the best, or we can plan for a brighter future and establish a new vision for the corridor. 

“Vision without action is merely a dream. Action without vision merely passes time. Vision with action can change our world.” Joel Barker 

Over the past 10 years, traffic along the I-70 corridor in St. Charles County has been increasing at a dramatic rate. St. Charles County will be working with the City of O’Fallon to improve the Route M/K interchange. St. Charles County will also be working with the City of St. Charles to improve the Fifth Street interchange and traffic flow between Fifth Street and First Capitol Drive.

Benefits of the I-70 Traffic Flow Improvement Plan:

  • Accommodate current and future traffic volumes
  • Reduce driver frustration and confusion
  • Improve safety
  • Increase capacity

Why is the I-70 corridor important?

  1. Forty-eight percent (48%) of the sales tax revenue collected in St. Charles County is derived from within a mile of I-70.
  2. Forty-six percent (46%) of St. Charles County jobs are within a mile of I-70.
  3. Twenty-seven (27%) of the residents of St. Charles County reside within a mile of I-70.

Are there additional development and redevelopment opportunities within the I-70 corridor?

Yes, within a mile of I-70, five percent (5%) of the land is vacant and another twenty-five percent (25%) is undeveloped. Further, the corridor also includes tracts of underutilized land. These are tracts that are not being used to their optimum potential and represent opportunities for redevelopment should the road infrastructure support a better and higher use.

Plan Descriptions

The County in partnership with the Federal Highway Administration, Missouri Department of Transportation, and the City of O’Fallon, is planning traffic flow improvements for Interstate 70 (I-70) between TR Hughes Boulevard on the east, and Woodlawn Avenue on the west. The changes being proposed are designed to reduce the number of traffic signals and significantly lessen wait times throughout the area. The $16 million project will start in late 2017.
In addition, the County, in partnership with the Federal Highway Administration, Missouri Department of Transportation, and the City of St. Charles, is planning improvements to improve traffic flow and stimulate economic development between Fifth Street and First Capitol Drive, where 50% of traffic crossing the Blanchette Bridge exits.The plan includes a Diverging Diamond Interchange (DDI) at Fifth Street; a new one-way outer road on the north side of I-70 between Fifth Street and Fairgrounds Road; slip ramps to and from I-70 connecting to this new outer road; the addition of a fourth lane under First Capitol Drive/Route 94; and an eastbound exit ramp from I-70 to Fairgrounds Road. MoDOT will manage construction on the $20 million project, which will start in spring 2016. The new interchange and outer roads will be open to traffic by Thanksgiving 2016; however, work will continue into spring and summer 2017 on striping, signage, planting, and other enhancements.
Links to O’Fallon project:

Links to St. Charles project: