The accident happened around 3:15 p.m. Friday in the northbound lanes near the Route 295 overpass.
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Police say a dump truck ran the unmarked police cruiser off the road and into a guard rail.
The officer was heading back to New Castle County Police Headquarters with a prisoner, police say.
The prisoner was also seriously hurt in the crash.
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Both victims were taken to an area hospital to be treated for nonlife-threatening injuries.
Route 13 northbound was temporarily closed in the area of the 295 ramp. It has since been reopened as of 6 p.m.
No arrests have been made.