(a) The department shall:
(1) during reasonable daylight hours, as established and posted by the department, from Memorial Day to Labor Day, provide:
(A) occupied lifeguard towers or mobile lifeguard units on each side of each pier, jetty, or other structure that protrudes into the Gulf of Mexico that is located within a state park; or
(B) a single occupied lifeguard tower or mobile lifeguard unit at each pier, jetty, or other structure that protrudes into the Gulf of Mexico that is located within a state park if the single tower provides an unobstructed view of both sides of each structure; and
(2) post within 100 yards of each side of each structure described by Subdivision (1) signs clearly describing the dangerous water conditions that may occur near the structure.
(b) The department may suspend or alter the duties imposed under Subsection (a) during dangerous weather conditions or emergency operations.