Swimming is not recommended because most lakes and streams are dangerously cold. Firehole Canyon, near Madison Junction, has a swimming area popular in summer. Soaking in thermal features is illegal. The area known as the Boiling River, north of Mammoth Hot Springs, allows soaking in the Gardner River near thermal outflow, but not in the feature itself. Soaking is allowed during daylight hours only and at your own risk.
[{"natural_lakes": "n/a", "swimming_allowed": "n/a"}]
[{"natural_lakes": "n/a", "swimming_allowed": "n/a"}] [{"natural_lakes": "n/a", "swimming_allowed": "no"}]