Learn about the project, then give us your thoughts!
Highway DD is currently a two-lane road and has experienced an increase of traffic over the years due to increased residential development south of I-64. Today there is only one thru lane through the ramp intersection on the west side of the I-64 interchange. There is a large residential and future commercial development being developed adjacent to this area along Highway DD. In addition, there are other recent developments further west that have either been built or anticipated to be built that will bring additional traffic to Highway DD. Highway DD has not been improved as far as capacity improvements in this immediate area since the early 2000's even though this area has experienced significant growth since then. For example, most of the area just west of I-64 off Highway DD was traditionally larger lot county residential homes with low density. By 2018, there were over 2,500 houses built that are along Highway DD since the early 2000s.
The purpose of the project is to build road improvements to Highway DD to improve traffic flow in this area. This will account for the 650 proposed residential homes, the thousands of other residential homes just west of this area, the newer high school and elementary school off of Sommers Rd, and newer regional City park (O’Day Park) and the St. Charles County park (Broemmelsiek Park) that have been built in the last 15 years. Progress and growth in this area has been limited due to lack of sewer service; however, that is changing. With this project, there is an opportunity to get ahead of the anticipated growth.
The project description is as follows:
- Widen Highway DD to a four-six lane section, from I-64 south to Dalriada Blvd. Then, reduce back down to two lanes past the roundabout (includes left turn lanes at the proposed intersections).
- Caledonia Drive will be improved to a signalized intersection.
- Modify the intersection of the I-64 ramp, on the south side of I-64, to allow for two lanes passing through the intersection.
- Modify Winghaven Blvd. as it approaches the intersection of the I-64 ramp, on the north side of I- 64, to allow for three lanes passing through the intersection. This will not affect the 9/11 Memorial; however, will encroach closer to it.
- Add another lane for a dual left turn at the I-64 westbound exit.
- Add another lane for a dual left turn at the I-64 eastbound exit.
- Restripe the eastbound lane at Winghaven Blvd. and Technology Drive, to allow for a dual left turn onto Technology Drive. An additional signal head on the existing mast arm will also be needed. The pavement is already there however it is striped off.
- Construct a new single lane roundabout approximately 700 feet south of Caledonia Drive. If a traffic signal would be more appropriate, that could be utilized as well. MoDOT staff was still undecided on which device would be more appropriate. This roundabout will be built as a two lane roundabout but only one lane will be operational on opening day. Future development will trigger the expansion.
- Construct a trail along Highway DD along the project limits, within MoDOT right-of-way.
- The new intersections would be built with pedestrian access in mind.
- Preliminary Road Improvement Plans for Highway DD (PDF)
- Exhibit: Signal intersection of Highway DD and Caledonia Parkway (PDF)
- Exhibit: State Route DD Overall Improvements (PDF)
- Streets of Caledonia Conceptual Site Plan (PDF)
- Streets of Caledonia Planned Trail System (PDF)
- October – November 2020: Right-of-Way Approval
- August – November 2020: Final Plan Preparation
- December 2020: Final Plan Approval (MoDOT)
- July – December 2020: Utility Relocation
- January 2021: Advertise for Construction
- February 2021: Contract Approval for Construction
- March 2021: Notice to Proceed for Construction
- Completion of project: March 1, 2022