Meanwhile, back at Lake Addicks (the full pool of the reservoir plus perhaps an equal area backed up to the northwest), Google Earth Pro has a different view on reservoir depth transects across and along the berm, showing the expected 108' level and a 10' drop over the berm but a rather uneven surface for it. The lowest stretches on the berm are where overflow is occurring.
If the skies clear, we may get a Sentinel-2AB or Landsat image today. Only with those or a drone overflight can the real overflow zones be identified, as water seeks its own level very subtly at these very shallow gradients.
Many of the flood photos online are neither geo-located nor time-stamped. It is necessary to catch the name of store fronts and google map search them to find where they were taken. The dramatic photo below shows a Mexican chain franchise,Taqueria Arandas at Clay and Hwy 6 next to a Jack in the Box, which can be unambiguously identified as looking east to the almost entirely submerged golf course in the NW corner of the Addicks reservoir.
Cars are variably submerged up to their windows, indicating a depth of 2-3' or so here. Apparently no panoramic photo was taken, though most smart phones can tile these up easily as a helicopter rotates.