Looks like it opens on demand except for "after hours"
see link and info below.
MILE 126.3. WILSON PIGOTT BRIDGE (SR 31),
a/k/a OLGA BRIDGE.
Opens on demand, 6AM-10PM*
*THREE or FOUR HOURS’ NOTICE required for after-hours bridge openings. Numbers to call:
Florida Department of Transportation 239-656-7800.
After-hours and emergency calls will be forwarded. Otherwise call 239-656-7838 if any special help needed.)