"Black Water" by Eve Bunting
This is what the publishers say about the book:
"Thirteen-year-old Brodie Lynch was ready for the perfect summer of adventure along the awesome Blackwater River. That was before everything changed forever. When a harmless prank goes too far, the unthinkable happens. Brodie's lies make him a hero, but inside, his guilt tears at him like the treacherous current of the Blackwater itself, which has become a horrifying reminder of his part in the tragedy. In this gripping new coming-of-age novel, a young boy is faced with a choice between right and wrong and ultimately learns that truth can offer hope in even the darkest moments."