Here's a couple more shots.
The top shot shows most of the park from around the starting line way past the finish line including the shut-down area. The two light colored roofs at the far right are the covered bleachers on each side of the strip. Just the top panels of the ET & Speed displays are above water.
The bottom shot appears to have been taken from a hillside just down-track from the bleachers off the left lane. It shows both of the covered bleachers and the timing tower.
Those shots were taken Monday and it sounds like the river was still rising at a rate of 8" per hour and not expected to crest until 6 PM last night. At that point the buildings that were lost included the restrooms and food stands behind the pit side bleachers, a laundry room at the campground, the ticket booth at the pit entrance and part of the seating at turn one of the oval track.