Video from Colorado Parks and Wildlife. A log jam on the Arkansas River -- probably the first time I have heard of one of those -- is frustrating boaters in the Brown's Canyon section:The blockage, below Hecla Junction and downstream of the Seidel’s Suckhole rapid in lower Browns Canyon, stretches for 100 yards, and anyone using the river is required to portage around it. Nobody should try to cross the debris raft or try to remove parts of it, state officials said, as the floating wood is unstable. You never know, maybe some of those young guys who throw axes...