The upper Swan gobbles up boats every year, and occasionally claims lives, so note water conditions carefully. Peak runoff usually occurs around the first week in June. Since the area receives heavy snowfall, high flows may continue into July. When the runoff subsides, the river is safer. Spills that might be catastrophic in June will likely mean only wet feet in August.
Floaters can expect to encounter anglers on foot.
The Swan retains one of the nation's best bull trout populations, an imperiled fish species. Regulations prohibit fishing for them. Except for ever-increasing subdivisions, much of the upper Swan River bottom remains undeveloped. It's a great place to see wildlife such as white-tailed deer and black bear. A few grizzlies prowl the valley, but they're rarely seen.