Holy cr@p. Is that the auxiliary spillway?
Just below it, if my orienteering is correct.
The road that’s washed out is the one that runs across the top or the main spillway and goes over to that parking lot/boat ramp that was flooded yesterday.
That’s the road that leads up the hill to the large parking lot next to the auxiliary (emergency) spillway. It was washed out when water rose high enough to spill over the auxiliary spillway wall.
The water is lower now, a couple of feet below the top of that wall, and they’re starting to work on shoring up the “dry” side of that spillway as a temporary fix to hopefully hold them through the next big rain and the coming spring melt.