Pueblo has one of the best whitewater parks in the state for river surfing. You’ll find a number of different features here, and they tend to change significantly based on flow and based on where slit has moved around in the park. Keep an eye out for flows over 800 for big glassy waves that will let you surf all day, and take a look at all the features when you arrive to determine the best wave that day.
Features change depending on flows, but you can generally find something here if flows are over 450 cfs or so on the Arkansas at Moffat Street gauge, and something worth a drive from Denver over 1,000, or maybe 800 if nothing else is running.
For photos of the waves at specific flows, check out the River Surf Report.
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Park just downstream of the Lincoln/4th street bridge; the whitewater park will be just downstream, with trails on river right.