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Difficulty II
Length 0.1 Miles
Gauge Colorado Rv at Austin, TX
Flow Range 1800 - 7000 CFS
Flow Rate as of: 32 minutes ago 170 [CFS]
Reach Info Last Updated 09/05/2018 3:17 pm

River Description

Lake Austin and Lady Bird Lake are constant-level lakes, so when the LCRA releases thousands of cfs from Mansfield Dam/Lake Travis (usually during the summer, to support agriculture downstream or to generate hydroelectric power), this water is passed through Tom Miller Dam (Lake Austin) and Lady Bird Lake (Longhorn Dam), and a 50-foot-wide ledge 50 yards below Longhorn Dam forms a wide wave-hole combination.  This can also occur if upstream rainfall raises the level of Lake Austin or Lady Bird Lake beyond their maintenance levels.  Refer to the LCRA Daily River Report, but note that it only lists yesterday's dam releases.  Apparently LCRA does not make public today's dam releases because that information could influence energy markets.  Generally the best strategy is to watch the gauge and head to the wave when the gauge starts to rise.

This wave is the only real park 'n' play surf wave in Austin, and as surf waves go, it's not bad.  However, it's also somewhat high-maintenance.  The gate configuration and upstream releases have to be just right for the wave to form, and as of this writing, these conditions tend to occur only for a few hours in the middle of the afternoon during the summer months.  Furthermore, the water quality is relatively poor (Longhorn Dam is a top-release dam, meaning that the water coming over it tends to be warm and dirty), and the wave is shallow at most levels.  A concrete wall that forms the hole on surfer's right has, in particular, caused many boaters to hit their heads and shoulders when rolling.  Longhorn Dam tends to be a wave of last resort for those who need a surfing fix but don't want to drive to San Marcos or deal with tubers.

Typically the left part of the wave is the bumpiest.  At lower flows, you will be forced to side surf.  At higher flows, the right side of the wave will crest upwards of 5 feet.  Also, at higher flows, the wave becomes stickier.

When the release from Tom Miller Dam is extremely high (> 7000 cfs, particularly if any flood gates are open), the Austin Fire Chief will usually issue a boating ban that extends to the Colorado River below Longhorn Dam.  Police and fire officials can (and do) levy hefty fines or even impound your boat if they catch you breaking the ban.  These bans are not always well-publicized.  Generally the best place to find boating ban announcements is on the Austin Homeland Security and Emergency Management web site.

A swim here is typically not dangerous but could be tiring, since the river is 200 yards wide and the wave is dead center.

For more info, see Texas Whitewater.

WARNING:  Use caution when dropping into the wave from above

At higher release levels (4000 cfs, for instance), the wave is difficult or impossible to enter from downstream.  Paddlers will typically wait behind one of the pillars of the dam for a surge bubble from the dam to form, then ferry out at a 20-30 degree angle in an attempt to catch the downstream edge of the bubble.  The timing of this is tricky, however, and a mistimed ferry will cause the paddler to be pushed back toward shore instead of into the wave.  Some paddlers have chosen to ferry out between bubbles in order to increase the odds of catching the downstream edge when a new bubble forms, but due to the unpredictable nature of the bubbles, there is a small-but-significant risk that a bubble could form underneath the paddler when using this technique.  If the paddler is unlucky enough to be upstream of the boil line when the bubble forms, then the paddler will be pushed into the dam instead of into the wave.  This happened to an expert whitewater kayaker in 2007.  Fortunately he lived to tell about it, but he had a wild ride during which he was separated from his boat and all of his gear.  Within the local paddling community, there are stories of this happening on at least two other occasions, although no details of those incidents are known.  Moral of the story:  wait for a bubble to form before you try to catch it.

It also goes without saying that the dam should not be run from above.  Doing so is illegal and deadly.

WARNING:  Shallow Water

The depth below the ledge, even at high flows, is rarely over 4 feet, and the water is much shallower as it comes across the ledge.


There is a rebar structure located 30 yards upstream of the cluster of weeds in river center.  The rebar is slightly river right of center.  Many fishermen frequent this area and always seem to have 5 fishing poles each.  Keep an eye out for their lines.  Although it's rare, do not be surprised to catch a fish against your boat as it is hauled up to the bridge above.

Rapid Descriptions


Gage Descriptions

The wave is playable at flows lower than 1500, but it's pretty bland and unexciting.  Conversely, you can play when it's above 7000, but the wave begins to wash out and become unpredictable.  Ideal is between 3500 and 6000 cfs.

Dam release information can be found here:  LCRA Release Info


Directions Description

This is a PnP (Park-and-Play), so shuttle is by foot. Ignore the shuttle directions here, but use the text box to enter your home or other starting location to get drive time/distance and directions to this location.


To get to Longhorn Dam, take I 35 to Riverside Drive. Exit Riverside and go east a mile to Lakeshore Boulevard. Take a left at the light on Lakeshore and proceed straight, until it dead-ends at Pleasant Valley Road. Take a left on Pleasant Valley Road. About � of a mile ahead is Krieg Field Complex, a collection of baseball fields and a large parking lot just east of the Bridge. Park in the North East corner of the complex, near the dirt road. From the parking lot, you will have to portage your boat to the put in about 100 yards from the lot. The put in is located adjacent to the dirt road and the closest baseball diamond. Look for a break in the trees, and a concrete run-off. Follow the run-off down to the water. The descent can be a little sketchy, so wear a good pair of water shoes. The run-off will take you right down to the water's edge, on river left.

Date Flow Result Factor  
2007-07-10 n/a Near Miss/Rescue One Boat Trip Read More
2007-05-21 Medium Near Miss/Rescue Other Read More



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Jason Robertson

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Mike Erwin




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Revision #Revision DateAuthorComment
1192599 11/10/08 Mike Erwin n/a
1205083 07/14/15 DRC
1206745 07/31/16 DRC
1202141 05/14/13 Matt Muir Fixed broken link.
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1206746 07/31/16 DRC
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