Low, but can offer some play.
An old dam (adjacent to Story City Park and the athletic fields for the high school) was removed and replaced with 'rock-arch' structures in the river, creating three discrete drops (with eddies each side of each drop) and small surfable wave at bottom.
Somewhere in the 700-800 cfs range, the river becomes pushy enough that the three drops tend to merge. Strong paddlers will still find play, but beginners may be challenged.
Parking is convenient, and a short carry gets you to the river.
Photos of this location are available on the Iowa Whitewater Org - Story City