36 CFR §13.550

1. (a)Approaching a bear or any large mammal within 50 yards is prohibited.
2. (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.
3. (c)Continuing to engage in fishing within 50 yards of a bear is prohibited.
4. (d)The prohibitions in this section do not apply to persons—
   1. (1)Engaged in a legal hunt;
   2. (2)On a designated bear viewing structure;
   3. (3)In compliance with a written protocol approved by the Superintendent; or
   4. (4)Who are otherwise directed by a park employee.