A footbridge also collapsed in the Kumamoto region.
It is unclear if anyone was injured, or when the collapse took place. Traffic appears to be travelling on the bridge that runs parallel to it.
More than 40,000 households are without power, according to an update on Kyushu Electric’s website. There has also been damage to roads.
There have been more than 60 aftershocks ranging in magnitude from 1 to 4, Japan’s Meteorological Agency said.
A tsunami warning was issued immediately after the quake, but was lifted within two hours.