It can be run lower than this, but it gets scrapy and it's not the same river as at the "normal" levels.
The put-in consists of bumpy class II water that brings you to a series of ledges after passing under the first bridge. With a low level, these ledges can mostly be boat scouted to find the best route. At higher flows it's best that you already know your line. The Top Ledge is a six-foot drop that shouldn't present any problems, although river right should be avoided because a pinning potential exists here.
Note: these drops become much more difficult and dangerous at high levels (~1000 cfs, IV+). Top Ledge develops into a terminal hydraulic, guarded by the downstream rocks on the right; it was the site of a high-water fatality on Jan. 1, 2011.