Main Street Bridge Lane Closure Set for Downtown Jacksonville Riverfront Plaza Work

A major traffic shift is coming to one of downtown Jacksonville's most visible river crossings. Starting August 24, the southbound side of the Main Street Bridge will narrow to a single lane and close its pedestrian walkway for more than five months as the city builds a permanent connection to the new Riverfront Plaza on the Southbank.

The lane reduction and sidewalk closure will run through January 30, 2027, the City of Jacksonville announced August 7. Northbound traffic heading from the Southbank toward the Northbank will keep two lanes open throughout the construction period, but pedestrians will need to follow detour signs for alternate walking routes across the river.

What's happening

The construction zone will affect the southbound approach to the Main Street Bridge—the span carrying traffic from downtown's Northbank district across the St. Johns River toward Riverplace Boulevard on the Southbank. Southbound vehicular traffic will be reduced from two lanes to one lane for the duration of the project. The southbound pedestrian walkway will be completely closed.

Northbound traffic returning to the Northbank will retain two lanes and will not be directly affected by the lane closure. Work is scheduled to begin August 24, 2026, with completion anticipated by January 30, 2027—a construction window of approximately five months.

The city describes this construction phase as the first step in creating a permanent pedestrian connection from the Main Street Bridge to the new Riverfront Plaza, which is currently under Phase Two construction. The plaza is part of the Downtown Investment Authority's broader effort to activate the Southbank waterfront and create continuous public access along the river.

The city has posted closure and detour information online and will install pedestrian detour signage along affected sidewalks. A pedestrian detour map released with the announcement shows the alternate walking routes that will be marked for people traveling between the Northbank and Southbank during the closure period.

Impact on downtown commuters and traffic

The Main Street Bridge is one of three road crossings linking Jacksonville's downtown core across the St. Johns River, along with the Acosta Bridge to the east and the Hart Bridge to the west. Reducing southbound capacity to one lane during the evening commute and weekend activity periods will likely push some drivers to those alternate crossings or to surface streets on either side of the river.

Downtown Jacksonville's street grid funnels Northbank office traffic toward a handful of river crossings during the evening rush. With the southbound Main Street Bridge operating at half its lane capacity, drivers heading to San Marco, Riverside, and the Southside via Riverplace Boulevard should expect slower merges and longer queues at the bridge approach, particularly between 4 p.m. and 6 p.m. on weekdays.

The single-lane restriction will also affect weekend access to Southbank restaurants, the Museum of Science & History (MOSH), and riverfront events. Visitors to the area during Jaguars home games at nearby TIAA Bank Stadium—though most game traffic uses the Hart and Acosta bridges—may see spillover delays if they route through downtown.

Because northbound lanes remain fully open, the impact on the morning commute into downtown office towers on the Northbank should be minimal. The asymmetry of the closure reflects the construction's focus on the bridge's southern terminus, where the new pedestrian infrastructure will tie into the Riverfront Plaza.

Pedestrians lose a direct St. Johns River crossing

The closure of the southbound pedestrian walkway removes one of the few comfortable options for walking across the St. Johns River in downtown Jacksonville. The Main Street Bridge's wide sidewalks and movable-span architecture make it a popular route for residents, tourists, and downtown workers moving between the Northbank's office core and the Southbank's restaurants and riverwalk.

Pedestrians will need to follow the city's posted detour routes, which are expected to direct walkers to the Acosta Bridge's sidewalks to the east or potentially to street-level crossings that add distance and time to a river crossing. Neither alternative offers the directness or the experience of the Main Street Bridge walkway, which provides open views of the river, the Skyway, and the downtown skyline.

The five-month sidewalk closure could discourage casual walking trips between the two banks and may shift some foot traffic to the Skyway elevated peoplemover, which connects selected Northbank and Southbank stations but does not serve all origins and destinations. For daily pedestrian commuters—including those walking from Southbank apartments to Northbank offices—the detour adds both time and uncertainty during a period when the Downtown Investment Authority has been working to make downtown more walkable and connected.

The construction will also affect access to the bridge itself as a public space. The Main Street Bridge's pedestrian zones are used for riverfront photography, casual recreation, and as a vantage point during events like the Jacksonville Light Boat Parade and July 4 fireworks. Losing that access for five months removes a piece of the public riverfront experience during the fall and holiday season.

What the Riverfront Plaza project means for the Southbank

This construction phase is the latest step in the city's multiyear effort to transform the Southbank waterfront into an active public amenity. The Riverfront Plaza project, led by the Downtown Investment Authority, envisions a continuous promenade and gathering space along the river's edge, stitching together previously disconnected parcels and creating a southern counterpart to the Northbank's Friendship Fountain park and riverfront trail.

Phase Two of the plaza construction includes landscaping, hardscaping, lighting, seating areas, and the infrastructure to tie the plaza into the city's broader riverwalk network. The permanent pedestrian connection from the Main Street Bridge is a critical piece of that network—it will allow people arriving on foot or bike from the Northbank to step directly into the plaza without navigating street crossings or gaps in the sidewalk.

The design goal is to make the Southbank riverfront as accessible and walkable as possible, reducing the psychological and physical barriers that have historically made the area feel car-dependent and disconnected from downtown's core. A direct bridge-to-plaza pedestrian link supports that vision and could increase foot traffic to Southbank businesses and cultural venues once construction is complete.

The Downtown Investment Authority has used incentives, public improvements, and land assembly to spur private development on the Southbank, betting that better public space will attract residents and investors. The Riverfront Plaza is a foundational piece of that strategy, and the bridge connection is designed to ensure the plaza feels integrated with downtown rather than isolated on the far side of the river.

What happens next

Construction is set to begin August 24, 2026. The single southbound lane and pedestrian detour routes will remain in place through the anticipated completion date of January 30, 2027. The city has not announced interim milestones or phased reopenings, so travelers should plan for the full five-month duration.

Motorists and pedestrians can check the city's posted closure and detour information online for real-time updates and alternate route maps. The city recommends that anyone regularly crossing the river between the Northbank and Southbank build extra travel time into their schedules and consider alternate bridges during peak periods.

Once the pedestrian connection is complete, the Main Street Bridge will serve as a direct gateway to the Riverfront Plaza, part of a broader effort to knit downtown Jacksonville's two riverbanks into a cohesive, walkable urban core. The question for the next five months is whether downtown's street network and alternate crossings can absorb the displaced traffic and foot traffic without significant delays—and whether the finished product delivers the connectivity the city has promised.