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.)
The Southwest Second Avenue Bridge crosses the Miami River amid a mass of newly built high-rise buildings and a power substation almost masked by a row of palm trees. The bridge has a closed vertical clearance of 18 feet*, with 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 12' for this bridge, however, local boaters report 18'.