At your age, coaches are more interested in experience. Do you currently row at school or at a club during the summer? What boat and seat are you in? Who do you train with and how competitive is the program? Even though you'll be sweeping in SS- can you scull, too? That sort of thing.
On applications, list your accomplishments- Regattas, medals and indoor rowing championships. If you don't have anything to list- talk about the sport as a passion or interest.
Crash B's is something athletes train for all year and it's fairly intense. If you're old enough and think you can do well- go. (SS crew coaches pay close attention to this event and it's not uncommon for recruitment to happen in the last week of February). The 2013 Crash B's website went live last week. If you're still too young or inexperienced to compete, I highly recommend you go as a spectator.
Also- worry more about your PR
as you get closer to college. You have time!