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"Do you know if the contractor has moved in a rock crusher/classifier and begun processing the aggregate on site?"

There is an onsite rock crushing plant already in operation. Haven't been able to locate it with images, yet. (I've looked in the areas of the large stockpile of material removed from the diversion pool - nothing stands out). DWR reveals that this current rock crushing unit "provides gravel and rocks to be used for paving and recovery efforts at the Lake Oroville spillway site". Notice the inclusion of the words "paving" and "recovery efforts". These are clues to the next steps. Image was taken April 21, 2017. I suspect they are going to move quickly on building the access roads. Tidbits of info come out from press conferences, comments to the press, or photos - so its a form of a scavenger hunt. Bits of information are revealed from a news helicopter overflights, private plane overflights, on-the-ground private youtubers, Juan Browne's videos, or DWR's drone videos.

The skyward shot of this image doesn't give many clues to its location - it does indicate where its not in the picture. However, the size of the larger rock in this conveyor pile indicate this rock is more suited for base road building (i.e. like "pit run" - too large for standard paving).

I doubt very seriously that the slab work on the spillway would be done with local aggregate.

Local aggregate is used for mass concrete, but often there is too large a percentage of extraneous materials, clays, lignites, and such to have a good mix. Likewise, there is no history on a mix design from the local aggregate.

For durability this needs to be done with the right type of limestone aggregate in a proven mix design.

The RCC could be done with something local but I doubt that such will be the case. I imagine a local batch operation however.

Kiewit batch plant installation - Boat Ramp parking lot @ ES - Water Feed Hose run to Reservoir

Photo taken Sunday May 21, 2017. Shows they are working weekends. Painted "Kiewit" logo prominent on unit. DWR metadata on photo says construction work to "ramp up" May 22, 2017

I suspect a 2nd plant may be setup on the east side of the Main Spillway were there used to be a large building in the original 1960's construction of the spillways & FCO headworks. Piles of presorted aggregate and materials have been conveyor belt "piled" at that "staging" location.

Kiewit batch plant in the Boat ramp parking lot near the Emergency Spillway. Large Black hoses observed running along the face of the Emergency Spillway to the Reservoir. Inferred to be the intended water supply for the plant.

Possible 2nd batch plant location on the east side of the main spillway. Stockpiled material "cones" shaped from depositing typically by a portable conveyor unit.