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I believe the problem is bigger. Notice how "green" the grass is further up past the electrical tower. Now compare this to the greenest of green grass on the other hillside on the other side of the spillway. Unless the soils are richer on the left side, the darker green grass on the left side (far upslope) indicates a widespread saturation of the slope. At a certain elevation point, the spillway flow cannot get to this high (water table).

An unconfirmed report - many posts ago - was heard on the radio chatter of a crack in the gate roadway, and that there was water seepage coming out of the crack. I surmised - if the report was legit - that the location was on the ES side of the curve part of this bridge road. IF so, this crack would have been at an elevation in the hillside of the left side of the spillway (looking upslope). This may be a clue if there is a potential "piping" source at or beside the gates.