87th Street / I-35 Highway System EnhancementGeolocation: 38.9706, -94.7149

Increasing congestion on 87th Street, an urban arterial in the cities of Lenexa and Overland Park prompted a design team including Terracon to find a solution. In 2001, the design team was awarded two projects with a combined construction cost of $110 million.  These projects have three clients; the Kansas Department of Transportation (KDOT), the City of Lenexa and the City of Overland Park. Widening 87th Street from four to six lanes with reconstruction of the 87th Street overpasses at I-35, U.S. 69 and the BNSF railroad into a single point urban interchange was determined to be both operationally efficient and compatible with the limited right-of-way at I-35. The overall project consisted of improvements to I-35 between 75th Street and 95th Street, improvements to U.S. 69 between 95th Street and I-35, and improvements to 87th Street between Quivira and Goddard. Terracon provided geotechnical and geo-environmental engineering services associated with the reconstruction and widening of the project site. Major improvements included:

  • A new single point urban interchange (SPUI) at the intersection of I-35 and 87th Street.
  • A new 87th Street to southbound U.S. 69 ramp, which required the relocation of part of Nieman Road south of 87th Street.
  • Widening and reconstruction of the existing 87th Street bridges over the BNSF railroad tracks, I-35, and U.S. 69.
  • New exit ramps for northbound I-35 to 75th Street and northbound U.S. 69 to 75th Street.
  • Addition of a fourth northbound through lane to I-35.
  • Addition of new northbound and southbound through lanes to U.S. 69. Grade changes (primarily cuts) were required along U.S. 69 to accommodate the new lanes and proposed super elevation changes.
Terracon performed subsurface explorations and geotechnical/geological services for eight bridges, nine ramps, two lane additions, five box culverts, one storm sewer, five city street realignments, five sanitary sewers, 11 retaining walls and two noise walls. Exploration, laboratory testing, cross section development and engineering reports were provided to the clients in accordance with KDOT guidelines. Because additional right-of-way was required along the 87th Street corridor to accommodate the widening of 87th Street, realignment of ramps and realignment of Nieman Road/88th Street, Terracon also performed seven Phase 1 environmental site assessments of surrounding properties. Several properties were found to have environmental impacts. Terracon conducted limited site assessments, developed remediation plans for impacted properties and oversaw environmental clean-up activities. In 2009, this project received ARRA stimulus money from the U.S. government. Terracon’s services resumed for the second phase of the project.

Overland Park and Lenexa, KS



Associated Office

LenexaGeolocation: 38.9543, -94.746

For nearly 40 years Terracon's Lenexa office has provided environmental, facilities, geotechnical, and materials consulting engineering services throughout the Kansas City metro. Our employees are knowledgeable about local environmental policies, regulations and concerns, geologic conditions, and construction materials procedures and codes. We have a fully equipped, American Association of State Highway and Transportation Officials (AASHTO) and United States Army Corp of Engineers (USACE) certified laboratory, supported by the largest field technician crew and equipment fleet in the…