What was supposed to be a straightforward safety facelift for Natural Bridge Road has turned into a bit of a scavenger hunt beneath the sidewalks. Crews working on the Missouri Department of Transportation's long-planned upgrades uncovered old basements and coal chutes under sections of pavement this summer, forcing a partial pause on the project between Lucas & Hunt Road and the St. Louis city limits. With the construction timeline now uncertain, MoDOT turned to neighbors for input at an open-house meeting Tuesday in Pine Lawn.
MoDOT holds open-house to explain options
The open-house at Pine Lawn City Hall gave residents a closer look at proposed safety changes on Route 115, better known locally as Natural Bridge Road. According to the Missouri Department of Transportation, the project stretches from Lucas & Hunt Road to the St. Louis city limits and includes resurfacing, new sidewalks and ADA ramps, upgraded lighting and mid-block pedestrian crossings. With crews running into hidden underground structures, the meeting also served as a chance for MoDOT to float a possible alternative design to neighbors.
Hidden basements force structural fixes
KSDK reported that MoDOT area engineer Tabitha Locke told attendees crews had found coal chutes and "a full basement" under sidewalk slated for removal between Rossiter and Francis avenues. That buried infrastructure means the sidewalks cannot just be torn out and poured back the same way. Engineers say structural repairs are needed before they can finish safe, ADA-compliant walking routes, and depending on the chosen fix, MoDOT may have to secure temporary construction easements or building access to get the work done.
What MoDOT is proposing
Faced with the surprise basements, MoDOT has outlined two main paths for the corridor: stick with the original design that keeps two lanes in each direction, or reduce lanes from Ridgedale Avenue to match existing reduced-lane sections closer to the city line. In its project FAQ, the Missouri Department of Transportation says the lane-reduction option could slow traffic, shorten pedestrian crossings, create space for a bus pull-out and potentially speed up sidewalk construction in some areas. The agency lists the overall job at roughly $5.8 million and says a new completion date will not be set until structural designs for repairing sidewalks over basements and coal chutes are finished.
What the evidence says
MoDOT's lane-reduction idea is not coming out of nowhere. So-called road diets have been studied across the country, and the Federal Highway Administration's guidance notes that converting a four-lane undivided road to three lanes can cut overall crashes and shorten crossing distances for people on foot. That national research helps explain why some local advocates have backed a narrower, more pedestrian-focused Natural Bridge. At the same time, planners are weighing those safety gains against worries about traffic flow and bus operations along a busy, built-up corridor.
Advocates point to outcomes
Supporters of a narrower Natural Bridge point to what has already happened inside the city limits. Trailnet reported a roughly 70% drop in overall fatalities on completed city sections and said there were zero pedestrian deaths in fully finished stretches. CEO Cindy Mense credited lane narrowing, concrete medians and curb bump-outs with shortening crossings and giving people more protection in the street. Some advocates at the meeting told MoDOT they would rather see full traffic signals at certain crossings instead of rapid-flashing beacons, citing experiences from similar projects such as Gravois, KSDK reported. The open-house gave residents a chance to push MoDOT on those tradeoffs while engineers refine repair plans.
Next steps and how to comment
MoDOT says public feedback will help determine whether it extends a lane reduction or focuses on repairing sidewalks in place while keeping the existing lane setup. Property owners who might be affected are encouraged to watch for outreach from the agency about potential temporary easements and structural work tied to the hidden basements. Comments on the project are being accepted through the online comment form listed on the project page and by contacting MoDOT's St. Louis District for updates.
