The Southwest First Street Bascule Bridge crosses the Miami River just west of the fixed Interstate 95 bridges, and just before the West Flagler Bascule Bridge. The bridge has a closed vertical clearance of 12 feet*, and 75 feet of horizontal clearance at the center span. The bridge operates on a restricted opening schedule. Monday through Friday, from 7:30 to 9 a.m. and from 4:30 to 6 p.m., the bridge does not open to waiting vessels. The bridge opens on demand at all other times.
*Note: NOAA charts indicate a vertical clearance of 18' for this bridge, however, local boaters report 11'.
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.)