At 7:05 a.m., police say park goers noticed a minivan partially submerged in the Schuylkill River just beyond the Flat Rock Park boat ramp.
Rescue crews arrived and were able to remove a woman from the sinking vehicle.
The woman was pronounced dead at the scene.
The mini-van was retrieved from the river.
Officials say the victim is believed to have been the only occupant of the vehicle.
The cause and manner of death are still under investigation.
The identity of the woman, believed to be in her 40s, is being withheld until next of kin can be notified.
