CHICAGO — Chicago beaches officially open for the season on Friday.

Swimming is only allowed from 11 a.m. to 7 p.m. when lifeguards are on duty, but the lifeguard shortage the city is facing could prevent a full opening.

Chicago Park District Officials are hoping a $500 bonus for new seasonal lifeguards will help fill the almost 600 positions it needs for a full staff.

The National Weather Service is warning of dangerous waves, up to seven-feet high Friday on Lake Michigan. The warning continues until 10 p.m.

Full forecast details and more at the WGN Weather Center blog

Beachgoers can also access information on swim status by calling the Chicago Park District Beach Hotline at 312-74-BEACH or checking chicagoparkdistrict.com.

Admission to Chicago’s beaches is free.