The first opening bridge on the New River (when approaching from the east from the Intracoastal Waterway), the Southeast Third Avenue Bascule Bridge has a closed vertical clearance of 16 feet with 60 feet of horizontal clearance at the center span. The bridge operates on a restricted schedule and does not open for waiting traffic from 7:30 to 8:30 a.m., or from 4:30 to 5:30 p.m., Monday through Friday. The bridge opens on signal at all other times.
Depending on schedule, the bridge can be opened by horn signal (one long, one short) or by hailing the bridge tender on VHF Channel 09. (All bridges in the state of Florida must be hailed on VHF Channel 09.)