They dont have to build a new spillway like the old one.
All they have to do is leave it the way it now is and shore up the damaged end and excatvate the rock down from it to the stream bed. Use some of the rock to shore up the one side where it washed away the banks and cement the whole shebang.
On the Em spillway, excavate the hill in front so the water spreads out and runs down away from there to the stream bed. Then, cement an apron all the way down for about a good ways, about 300 yards, and they can simply use that apron as an access to the parking lot. At the base of that spillway, form the apron in a arc so that water gently runs away from the base.
I mentioned a gold mining co because that rock colour indicates gold bearing material. I would say about 1000 pounds of material to the ounce. They would have to take samples. I would bet they would get it done for free as the water company would get about 10% return from the mining company.
We agree, it is NO PROBLEM getting it done and done fast. They simply have to make a mountain out of a mole hill these days.
2 oz per ton? Hummm.