A bridge replacement will close a popular Marietta cut-through until Cobb County students return to classrooms.

Casteel Road, near Sewell Mill and Johnson Ferry roads, is closed so crews can replace the "substandard" bridge over Piney Grove Creek, the county transportation agency said in a Facebook post. The waterway used to be called Sewell Creek.

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The project will cost just over $1.5 million, said Torie Anderson, Cobb DOT spokeswoman. She said the money comes from the 2016 Special Purpose Local Option Sales Tax, or SPLOST.

The last place to turn around heading east toward the closure is Meadowind Lane. There will be detour signs posted.

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When county transportation officials were looking for contractors, the county said the work had to be done over summer break to not interrupt school patterns.

Murdock Elementary and Dodgen Middle are both less than a mile away from the construction site.

Casteel is expected to re-open on July 31, the day before classes begin.

If you're really into this bridge, you can read the foundation inspection report and the 98-page "Special Provisions Supplemental Specifications" document.

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