The United States Canoe Association holds a major, six-day national canoe & kayak championship event every year, usually in early-to-mid August.
The current format is:
Tue: Adult & Adult/Youth Sprints
Wed: Orienteering, and the "unofficial, fun" Biathlon
Thu: Youth Sprints
Fri-Sun: Marathon races, typically 2-3 hours in length.
The week-long event caters to paddlers from 5 to 90+ Years. The marathon races are for adults and combined adult/youth teams.
The marathon races in particular cater to paddlers whose expertise ranges from intermediate to elite and whose training ranges from casual to intense.
Click the following links for further information:
2010 USCA Nationals in Peshtigo, WI, August 10-15.
USCA's Competition Rules.
Results from the 2009 Nationals.