Right on!
Construction of that parking lot for boat ramps -- and the idiotic rock-based road (aka dam) literally directly across the spillway for access to it -- was some of the stupidest "enginering" I have ever seen.
They took a questionable spillway design and turned it into a guaranteed disaster. And, -- as you mentioned -- the "repair" efforts so far have ignored the designed-in vulnerabilities on the parking lot end of the spillway -- and have made the problems they're trying to fix even worse -- if water ever goes over that spillway again.
Sheer idiocy! (I'm considering posting an illustrated thread on that subject...)
Not only that, the people who engineered this spillway have no clue about hydraulics. There appears to be a hill right in front of that spillway. Now that hill is a restriction and water, like electricity, will follow the path of least resistance.
So, if you watch the video of the last overflow of that spillway, you can see that they have a lot of that water flowing back towards the main dam and then out away. Instead, when they built that spillway, ALL that hill should have been removed, an apron built from the base of the spillway the entire lenght of it, and away from the dam for some distance. I would say about 4 to 500 feet or more. That way, the water coming over that spillway would spread out gently and run away from the dam where it could have been diverted into the river channel below. Then, the base of that spillway has NO GENTLE slope. They have about a 90 degree angle where the water comes directly over the spillway and is allowed to cut at the base of the spillway. A CURVED SLOPE should have been built there to shoot that water away from the spillway. The parking lot area of that dam should have been built up at least 20 feet-a berm of sorts, to coax that water over the spillway.
When this is over, they should break out ALL the old part of the primary discharge that is damaged, including the rock which should be used to shore up around the exsisiting primary undamaged discarge area-where it now ends, and then clear ANYTHING that would restrict water flow from the end of that primary discharge. Then do the above repairs to the EM spillway.
BTW, I have a degree in engineering for marine diesel, which required us to figure forces and restriction of the power of water (hydraulics) on ships and etc.