St. Johns County has finished widening a three-mile stretch of County Road 210 from two lanes to four, closing out a $42.5 million project that eliminates a bottleneck on one of northwest St. Johns County's most congested corridors.

County officials, community members and project partners marked the completion with a ribbon-cutting ceremony Sept. 30, according to a county announcement. The project was featured as a top story in the county's November 2026 e-newsletter, published Nov. 3.

The widened roadway runs between Old CR 210/Greenbriar Road and Cimarrone Boulevard. It connects to the existing four-lane section at Cimarrone, creating a continuous multi-lane route through a corridor that has seen rapid residential and commercial growth.

"There are some major infrastructure improvements that are going on in St. Johns County with the attempt to improve the quality of life for all the citizens of St. Johns County, and that's what we're committed to," District 1 Commissioner Christian Whitehurst said at the ceremony.

What the project built

Beyond the lane expansion, the project added new bridges, sidewalks on both sides of the roadway and traffic signals at three intersections: Stillwater Boulevard/South Hampton, Shearwater and Greenbriar Road/Old CR 210. Crews also installed curbing, stormwater pipes and two drainage ponds.

Construction began June 30, 2023. Funding came from impact fees and the Transportation Trust Fund, the county said. Superior Construction Co. served as the contractor, Osiris 9 as the civil engineer and Eisman and Russo Inc. provided construction engineering and inspection services.

Greg Caldwell, director of St. Johns County Public Works, said the lane widening was "one part of a much broader effort."

"The work included bridges, sidewalks, drainage improvements and new traffic signals, all of which contribute to how this corridor functions," Caldwell said, according to the county announcement. "We appreciate the patience of residents and local businesses throughout construction."

Why it matters for commuters

Before the project, drivers moving between Interstate 95 and eastern portions of CR 210 hit a sudden two-lane constriction between already-widened segments to the west and east, as First Coast Observer reported. That created backups during morning and evening peak periods and raised safety concerns as traffic volumes climbed.

CR 210 is a primary east-west artery connecting communities west of I-95 to the Nocatee area closer to the coast. The segment between Greenbriar and Cimarrone passes through a zone of active residential construction.

This is the second CR 210 project to wrap up in 2026. A separate set of improvements from I-95 to U.S. 1 finished with a ribbon-cutting April 24. That $18.7 million project widened about seven-tenths of a mile from two lanes to six between Trinity Way and Beachwalk Boulevard, according to the county's project page.

The completed roadway is now part of the county's maintenance inventory. Responsibility for signal timing, pavement upkeep and stormwater system operation shifts from the contractor to St. Johns County Public Works.