I'll echo codeman. Boat traffic was pretty light* and the line for slips @ the Weirs was maybe 3 or so boats deep on Sun afternoon. Less that normal for a July or August weekend for sure. Road traffic was higher than a normal weekend. Even in Alton I'd wait to get across Rt11 .... best to go by boat or not go I say !
*except for the sailboats becalmed right by the Witches channel.