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At about 3:55 p.m., the Houston Police Department said it responded to the crash on Highway 288 and Holcombe.
Houston Transtar cameras showed first responders at the scene before it was cleared.
According to the Fort Bend County Sheriff's Office, witnesses said the motorcyclist was speeding and crashed.
Officials said the impact threw the motorcyclist off the overpass and onto the roof of an FBCSO deputy's patrol vehicle on the highway.
Authorities said the deputy was able to tie a tourniquet on the motorcyclist until paramedics arrived and rushed the biker to the hospital in critical condition.
The deputy reportedly did not suffer any injuries.
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