Wave Description:
River Run Park is a set of high-performance river surfing waves on the South Platte near the Broken Tee Golf Course in south Denver.
Chiclets
Chiclets, named for the gum-looking blocks that help shape the wave, is the furthest downstream and the most beginner-friendly wave in the park. At lower flows it forms a friendly green face, and at higher flows it forms more of a pile, but it’s still surfable with higher-volume boards. Shortboards can work, but given the foam, more volume is better. Works from about 100 cfs and up, depending on how bad you want to surf.
Benihanas
The second wave, Benihanas, is a high-speed, dynamic wave that gives up great rides but can be challenging to surf for beginners. Once you have it dialed, it’s a fun, rowdy high-performance wave. It features a wave shaper – a set of three adjustable plates underneath the water that allow the wave to be dialed for particular flows. At higher flows (from 250 cfs to over 750 cfs) the wave creates a large A-Frame wave that can run from waist to chest high. Under 180 cfs, the wave is usually too weak to hold a surfer.
Given the high water speed, some surfers have been having success with wakesurf boards and other low-volume boards. Given the size of the wave and the trough, longer boards (over 6′) can be tough to surf here.
Shaped appropriately, from 500-1,200 cfs it will form a high, big-shouldered v-wave. The highly-adjustable nature of Bennis makes it one of the most robust waves in the state, able to withstand just about any amount of water we’ve seen come through the South Platte. Be warned that at higher flows (800+) the currents and eddies can make for more challenging swims.
Nathan’s Wave Sixxx
The Summer of 2019 brought a third wave online: Wave 6 (counted from the downstream end of the park, with Chiclets as number 1). In May 2025, the local River Run community officially gave Wave 6 the title “Nathan’s Wave” in honor of the late Nathan Ginn, the most joyous surfer to ever ride it. Ride like Nathan.
Nathan’s Wave is somewhat removed from the other two waves; it’s about half a mile upstream from Broken Tee. Its character is a lot different, largely owing to the fact that it is a sheet wave, rather than a jump wave. It’s about three times wider than Benni’s, and it’s significantly shallower. The wave is fast, steep, and wide. Since it is shallower, falls are significantly more consequential, particularly if you fall forward. It’s also harder on surfboards and fins.
Entries are usually performed as a wheelchair maneuver, with surfers sitting on the concrete on the sides of the waves and stepping onto their boards. Given the speed and steepness of the wave, adjustments need to be quick, and it can take some time to find the right balance point on the wave.
As of the spring of 2023, it also now has a webcam for surf checks. It’s not a live feed, it updates every 15 minutes from 5am-8pm. Find it here.
Quiver Recommendations:
Shorter is generally better on Benni’s and Nathan’s. Particularly at lower flows and on Nathan’s, the wave troughs are so steep that it can be difficult to ride a longer (over 5’6″ or so) board, but at higher flows the angles are softer and you can surf a larger variety of craft. The Scott Burke 5’2″ Fish (link, review) is a popular beginner’s choice. Short black-ball beaters or other short, thick ocean boards like the Catch Surf Beater are also pretty common. On Chiclets, more volume is usually better, and longboards , shorter SUPS, or high-volume hybrids do well.
Gauge Information:
The South Platte Below Union gives the best gauge here; look for 175+ cfs for Benni’s, and over 200 or 250 gives a much better opportunity for longer, more dynamic rides. Tuned right, it remains in great shape up to 1,200 cfs, and likely higher. In its earlier form, Chiclets wave could be surfed on a paddleboard all the way down to 60 cfs, but improvements at 130 cfs and above have led it to green out at low flows. Look for 100 cfs or more.
Look for 120 cfs or more for Nathan’s to work; with the wave working up to around 550 CFS until whitewater crumbles the surfable face.
Occasionally late in the summer, the Union gauge gets somewhat fouled by sediment. You can double-check it by comparing the Chatfield Outflow and the Englewood gauges. If the Union gauge shows a higher flow than the Englewood gauge, it’s probably wrong.
For photos of the waves at specific flows, check out the River Surf Report.
Want flow alerts for this gauge? Sign up here.
You can also get a peek at what’s coming down from Chatfield by keeping an eye on the Chatfield Outflow gauge. If flows change, they usually change around midday. Changes will take 3-3.5 hours to reach RRP.
Directions:
The park has two parking lots: a dedicated lot off Oxford on the west bank of the river, or a shared parking lot with the Broken Tee golf course on the east side of the park. Be warned that the golf course staff occasionally lock the entrance to Broken Tee lot at sundown, so be careful not to get locked in if staying late.