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The tunnel will be 14’ wide and 9’4” tall at the highest point. The walking surface inside the tunnel is approximately 12 feet below the ground level of Manchester Road.
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The City of Brentwood is working with the Missouri Department of Transportation (MoDOT) to update the roadway, improve pedestrian access and safety, and enhance the overall appearance of Manchester Road from Hanley Road to Bremerton Road.
Additionally, the Brentwood Bound plan will add a pedestrian tunnel at the Mary Avenue intersection, provide for more sidewalks and important ADA improvements, and upgrade traffic signals in the area, making it a much easier place for pedestrians to navigate.
The Brentwood Bound plan includes a 10-foot shared-use path along the south side of Manchester Road and a 5-foot shared-use path along the north side of Manchester Road.
To minimize the impact on traffic, MoDOT plans to complete most resurfacing overnight, with no more than two lanes closed at a time. All lanes are expected to remain open during most days of construction.
Sidewalk construction and the rebuilding of business entrances will also be coordinated to minimize impact, with crews working in either MoDOT’s right-of-way or on private property (in which the department has obtained an easement). Crews will make sure customers can access all businesses at all times.
A portion of the project will replace the bridge over Black Creek west of the Manchester Road and Hanley Road intersection.
Black Creek Bridge on Manchester Road (just west of the intersection with Hanley Road) will close on May 2 and remain fully closed through August 2022.
This full roadway closure will prevent traffic from going west from Hanley Road to Manchester Road. The closure also will prevent traffic from going east on Manchester Road to Hanley Road.
During the closure, vehicles will still be able to access businesses and residences along the Manchester Road corridor from Brentwood Boulevard.
During the same time, work will take place on the pedestrian tunnel near Mary Avenue. This work will reduce Manchester Road traffic to one lane in each travel direction.
For project details and updates, visit:
Route 100 (Manchester) resurfacing from Route 61/67 to I-270
The grade of land at Mary Avenue and Manchester Road is too high of a slope for a street-level crossing. The addition of a pedestrian tunnel allows for better ADA (Americans with Disabilities Act) access and improves safety by allowing those using the trails and paths to cross under Manchester Road. Not adding a street-level crossing also will help the flow of traffic on Manchester Road.
The pedestrian tunnel will be located at the intersection of Manchester Road and Mary Avenue.
Manchester Road will be raised approximately 5 feet from the existing ground elevation to accommodate the addition of the pedestrian tunnel.
The tunnel will be kept as dry as possible through a combination of stormwater management, raingardens/bioswales, and pervious pavers in the shoulder area of the tunnel. The stormwater management involves grading slopes to capture storm water runoff before it gets to the tunnel and redirecting it to the raingardens or to storm drains that pipe water under Manchester Road. Additionally, the trail pavement has ADA-compliant trench drains on both ends of the tunnel that will help capture stormwater before it enters the tunnel/underpass.
LED light fixtures will extend the length of the tunnel on both sides and will be lit 24 hours a day. Exterior lighting will lead into the tunnel at both entrances. Safety features in the tunnel also include at least one camera at the east entrance of the tunnel (closest to the new Brentwood Park); consultants and staff continue to discuss a way to add a second camera at the tunnel access closest to Manchester Road. The tunnel will be closed for use during any significant rain/flood event.
While one of the objectives of the Brentwood Bound Plan is to mitigate the base flood event (1% annual chance) along Deer Creek south of Manchester Road, the pedestrian tunnel will be approximately 12 feet lower than Manchester Road at the point of crossing, and it is possible for a flood event to exceed project design constraints. Check valves have been incorporated into the flood mitigation design to prevent storm sewer backups from the flood mitigation area into the pedestrian tunnel; however, a significant area tributary to Deer Creek resides north of Manchester Road. Storm sewers are typically designed to convey more frequent events, and when larger events occur, flood waters can sometimes be conveyed overland to their downstream most point. Because of the low elevation of the tunnel, it may accumulate some of this water during large storm events. Flooding can be extremely unpredictable, and because the pedestrian tunnel is connected to the new Brentwood Park and the flood mitigation area of the trail system – which will be subject to more frequent flooding – the tunnel will be closed off during any significant storm event.
More than 70% of the $4.8 million tunnel is being funded through grants from MoDOT (Missouri Department of Transportation), Great Rivers Greenway and the East-West Gateway Council of Governments.
The Brentwood Bound Manchester Road Improvements project includes an underground pedestrian tunnel at the intersection with Mary Avenue. At the Brentwood Bound public open house events on November 1 and November 3, 2018, the plans showed this elimination of the Van Mark Way connection to Manchester Road to make way for the tunnel. The City of Brentwood and TWM Engineering have been in contact with the Brentwood Place property owners about this project since early 2018.
The initial design (presented to the public on November 1 and 3, 2018) proposed bringing Van Mark Way through Rogers Parkway and creating a new intersection with Dorothy Avenue. This new intersection would have been 180 feet south of the existing Mary/Florence/Dorothy intersection. After a review by Missouri Department of Transportation and Federal Highway Administration concluded Rogers Parkway is considered parkland, the design team determined Van Mark Way could not be built through Rogers Parkway. The design team then pivoted to moving the Brentwood Place apartment complex access north to connect to the Florence/Mary intersection. This updated plan (presented to the public at the Brentwood Bound open house event on March 6, 2019) removes the roadway through a park and increases safety for users of Rogers Parkway and drivers by reducing the number of intersections. This will add 400 feet of vehicular travel to get to Manchester Road from Brentwood Place apartment complex. The playground and playground equipment in Rogers Parkway will be removed as part of this plan.
Van Mark Way Access Comparisons
Brentwood Place Apartments Signing-Striping Details
The option of burying the power lines was explored, but at an estimated cost of $13 million to $15 million it was deemed cost prohibitive during this phase of planning. In the past, developers have assisted with burying the utility lines during construction of new businesses. This will be the City’s goal with the future developments as well.
The planned pedestrian crossing locations and types, from east to west, along Manchester Road: