Charleston Marks Spring-Fishburne Drainage Project Completion

The $198 million flood-reduction effort includes deep tunnels, new stormwater pipe and a large pump station serving the peninsula.

Updated on Nov. 10, 2026 in Home Renovation

Screen-print poster illustration of a concrete stormwater pipe beside a low pump station in mustard, teal, and rust tones, evoking the city's new flood-control infrastructure. — Charleston celebrated completion of the $198 million Spring-Fishburne drainage project, a five-phase effort to reduce flooding along the Crosstown and U.S. 17 corridor. AI Illustration. Upload story photo >

Live Poll

Do you trust Charleston's local government to fix flooding in your neighborhood?

Charleston celebrated completion of the Spring-Fishburne drainage improvement project, which was undertaken to reduce flooding along the Crosstown and surrounding neighborhoods. The project cost roughly $198 million and was built in five phases.

Why it matters

The system is designed to keep the U.S. 17 corridor passable during most storms, a benefit for daily commuters across the city. Rainfall exceeding the system's design capacity could still cause flooding, so residents should not assume the network eliminates risk.

The project includes more than 9,000 feet of deep tunnels and 18,000 feet of new stormwater pipe, with a pump station that operates during King Tides. The extraction does not report post-completion performance data for storms exceeding the system's design capacity.

The players

City of Charleston

The municipal government of Charleston, South Carolina, which oversees the city's stormwater and drainage infrastructure.

The details

Construction progressed in phases as funding became available from five sources, and the majority of the system is underground. The pumps have been tested and are operational, and the related Windermere drainage project is under construction while the DuPont-Wappoo project is in design in West Ashley.

Monday, November 9, 2026: Charleston celebrates completion of the Spring-Fishburne drainage project.

Season Trajectory

The completed Spring-Fishburne network extends Charleston's peninsula stormwater program, which now covers about 20% of the peninsula. Related West Ashley projects at Windermere and DuPont-Wappoo show the work continuing beyond the downtown core.

Residents in flood-prone areas should not assume the new network eliminates risk, since rainfall beyond design capacity can still cause flooding. Drivers on the U.S. 17 corridor should expect the road to remain passable during most storms, but should monitor conditions during heavy rain.

The takeaway

Large underground drainage networks can substantially improve storm resilience, but they work within design limits and do not remove flood risk entirely. Staying aware of forecasts during heavy rain remains important even after major infrastructure upgrades.