This is a high-flow wave that can really come into its own at high water (though water quality can be iffy at the flows the wave comes in at). Keep an eye out for flows over 1,000, and things really start to roll over 1500, and things keep getting better as it gets over 2,000. It creates a wave hole with a significant green face that should work well for short boarders. Don’t forget your booties, as the eddies get trashy and there is a significant homeless population that hangs out in the area, so broken glass and the like is commonplace.
The State Division of Water Resources runs the best gauge for this stretch; you can find it here. The lower USGS gauge gives a decent picture of what’s going on though.
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Park at the park-and-ride next to the City of Cuernavaca Park, just in front of the new condos. Walk down to the river via the obvious walking bridge and the wave will be just downstream.