Precinct 4 said the unknown vehicle hit the overpass, causing concrete debris to fall onto the roadway.
An overturned tanker truck snarled traffic on the Grand Parkway northbound lanes at West Airport Boulevard in Fort Bend County, according to deputies.
SkyEye13 captured images of crews responding to an overturned tanker on State Highway 6 at Westheimer Road on Monday afternoon.
An image shows a jackknifed 18-wheeler, with part of it over the barrier. Authorities said this is impacting multiple lanes, including the HOV lanes.
It's unclear what led to the crash, but authorities said the deputy was hospitalized due to his injuries, which are not life-threatening.
Authorities said the train contained 137 rail cars, including the 23 that derailed. Of those cars, three were leaking: one was leaking corn syrup, and the other two were leaking ethanol, but authorities said there were no threats.