36 C.F.R. § 13.550 Wildlife distance conditions.
(a) Approaching a bear or any large mammal within 50 yards is prohibited.
(b) Continuing to occupy a position within 50 yards of a bear that is using a concentrated food source, including, but not limited to, animal carcasses, spawning salmon, and other feeding areas is prohibited.
(c) Continuing to engage in fishing within 50 yards of a bear is prohibited.
(d) The prohibitions in this section do not apply to persons—
(1) Engaged in a legal hunt;
(2) On a designated bear viewing structure;
(3) In compliance with a written protocol approved by the Superintendent; or
(4) Who are otherwise directed by a park employee.