The spill happened about 1 p.m. Thursday.
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The ramp is currently closed. There is no estimate when the ramp will reopen.
The ramp was shut down during the flooding along River Road over the past few weeks.
One of the hotspots for the copper thefts is the I-64/I-264 interchange near the Sherman Minton Bridge.
Construction requiring some lane restrictions will continue overnight and on weekends until late November, when the project is expected to be completed.
The left most westbound lane will be open, and access to the ramps will remain.
A tractor trailer jack-knifed and came to a stop with the front of the cab on the side of the retaining wall.
The project, funded by a $200,000 federal grant, will replace traditional wired lighting systems with solar-powered options, eliminating copper wiring.
The top deck of the bridge closed Monday, Aug. 5, for nine days to allow crews to continue work on hanger cables.
One lane reopened just before 6 p.m., and all lanes had reopened by 8:15 p.m. Monday.