I-29 & 85th Street Interchange

• Project valueTBD
• Contractor nameTBD
• Completion DateDecember 18, 2026

Project Update: 04/28/2025

• City is currently working on acquiring Right of way along this corridor.
• This project consists of the construction of a new diverging diamond interchange at 85th Street and I-29.
• Work will include underground utility installation, a pedestrian underpass, grading, concrete surfacing, signing, street lighting, and traffic signals.
• The interchange project is expected to begin construction later this year and be completed in late 2026 

Commuter Route Information

• 85th street from Tallgrass Avenue to Sundowner Avenue will be closed to traffic. Access will be maintained to local residents only.
• I29 traffic to remain in place during construction. Lane/shoulder closures will be allowed for work adjacent to existing lanes.
• Partial closures of I29 will be allowed overnight for bridge or MSE wall construction.

Project Milestones

Year 1 - Phase 1A

1. Traffic Control
2. Removals
3. Watermain
4. Grading
5. Geofoam Over L&C Watermain
6. Bridge Abutment
7. Bridge Pier
8. Grading Pumps

Year 1 - Phase 1B

1. Grading Bridge Abutment
2. Geofoam Over L&C Watermain
3. MSE Wall
4. Grading Pumps

Year 1 - Phase 1C

1. Final Grading
2. I229 Grade Widening at Ramp 1C
3. Excavation for Ramp 1C

Year 2 - Phase 2A

1. Ramp Paving
2. Bridge Construction
3. Storm Sewer

Year 2 - Phase 2B

1. Graveling
2. Curb and Gutter
3. Concrete Surfacing

Year 2 - Phase 2C

1. Lighting
2. Decorative Landscaping
3. Pavement Markings
4. Restoration
5. Open to Traffic