Update on the I-526 extension project in Charleston

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Graphic by SCDOT

SCDOT + Charleston County recently released a new plan for completing I-526 called Alternative G. The proposal is the latest route of the Mark Clark Extension project, which has been in the works for over a decade.

What will Alternative G look like?
The newly-proposed route is a 9.5-mile, 4-lane highway — including a path for cyclists and pedestrians and 2 connector roads on Johns Island. The planned speed limit is 35-45 mph.

Why is it the recommended alternative?
The route is expected to accommodate local population increase and reduce congestion on Maybank Highway on Johns Island by using 2 access roads. It also provides a protected multi-use path for residents.

Will anyone be relocated?
Seven businesses and 13 residences would need to be relocated for this route — 5 homes have been acquired so far. Find out if your property will be impacted with this interactive map by entering your address into the search bar.

How much will it cost?
There is no official cost yet for Alternative G as project leaders wait to gather and consider public comment. In 2019, the extension plan was estimated to cost between $725-772 million. The public will be informed of the price once it’s determined.

How can I get involved?
There will be an in-person, open-house public hearing on Sept. 14 at Essex Village Church in West Ashley from 11 a.m.-6 p.m. Sign up to speak online by Sept. 13 at 5:55 p.m. You can also fill out a comment form on the SCDOT website. Explore more ways to engage.

Want more details? Explore the project.

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