The Potomac River crested about 2PM EDT at a little over 10ft as measured on the Little Falls gauge. Here are a few pix that show the river flow from Great Falls to the Chutes section where Difficult Run joins the river. The river height was probably closer to 50 ft at Great Falls where the channel space is narrower than at the gauge near Little Falls.
GF panorama from the VA side
GF - Spout, Fingers, Horseshoe and Flake
GF - Spout, Fingers, Horseshoe, and Flake at a lower water level
Junk in Fishermen's eddy
2 boaters put in across from Fishermen's eddy at just about peak flow