I can't imagine being on a 29km long wave for over fours hours*. Gotta be in good shape for that. The river is "unsilting" faster than anyone had expected after the causeway gates were open. It would be gnarly to see hundreds of surfers riding much larger wave on a bore near a mile wide at one point but that depends on a lot of things, including the deforestation of the water supply grounds.

* I think that's what I heard one of the Californians say in a TV interview.