There's two features, one on each side of the river. A few years ago, surfers left was good for a spin and a surf even at flows around 1000 cfs like right now. Surfer's right is generally better at high flows like >10,000 cfs. Maybe someone else can comment on the in-between range. But, yes, bring your boat, it's probably playable at any level.
here is a link to some webcams looking at the waves. i just tried to open up the river right cam and it seems like it is down. that would be the one to watch at lower flows. it should be up again soon. http://www.coloradowebcam.net/
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