The Miracle Wave is a glassy wave that appears in the outflow of the Chatfield Reservoir during high-water releases, usually in the spring. Longer, faster boards tend to work better with most water levels.
The wave is entirely controlled by the dam outflow; look for 800+ cfs to start surfing, and 1000+ for things to get really good. It’s surfable at lower flows but the rocks are close. This is the dam outflow itself, but the Union gauge has better graphs and flow alerts.
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Park at the dog park and walk below the dam. Entry to the park is $8.