At 8:00 PM the weather forcast is for heavy rain and possible flooding all over the area Saturday morning.
If any of the gauges on the Brandywine, or Toh, are trending sharply upward in the morning tje water may be much to high by the time you get on the water. If the Toh is flowing anything over 2,000 cfs and still rising I would not paddle it.
If the Brandywine is flowing over 4 feet and still rising I woukd not paddle the river. but you can still "park and play" at Brecks Mill at much higher levels.
Holtwood is up to a good level now, and will still be good up to 150,000 cfs or more. It normally will not risw that steeply even during a heavy rain do to the size of the drainage basin.
Scudders Falls is at 20,000 cfs and rising steadily. At this lavel and higher it becomes more of a wave than a hole, and continues to flatten out as the water gets higher.
Wait for tomarrow for a better idea of what conditions to expect.