Scenic urban run in Round Rock, north of Austin. The upper part of the run has flat water and a 10-foot runnable dam, but the lower part of the run has some good play at certain levels. Whitewater boaters may choose to put in below the Veterans Park dam to avoid the first mile of mainly flat water.
Texas Whitewater describes mostly small rapids but mentions some 'fine surf spots' in the last mile.
Beta from local paddlers suggests that 400 cfs is a fun level, but 200 cfs can get scrapey (especially in a canoe.) Strainers are a danger but not quite as bad as in the upstream section.
Distances and gradient measured using GIS tools in 2015.