There are 42 bridges connecting more than 100 islands over a 126-mile distance. Three have been named National Historic Sites (old Seven Mile, Bahia Honda and Long Key). On the Overseas Highway, 18.8 miles comprises bridges — 15 percent of the total travel time is spent on bridges! (1 mile = 5,280 feet)

Name – Mile Marker – Length
Jewfish Creek – 107 – 223′
Adams Waterway – 103.5 – 60′
Tavernier Creek – 91 – 320′
Snake Creek – 86 – 230′
Whale Harbor – 84 – 270′
Tea Table Relief – 80 – 270′
Tea Table – 79 – 700′
Indian Key – 78 – 2,460′
Lignumvitae – 77.8 – 860′
Channel 2 – 73 – 1,760′
Channel 5 – 71 – 4,580′
Long Key – 65 – 12,040′
Tom’s Harbor 3 – 61 – 1,270′
Tom’s Harbor 4 – 60 – 1,460′
Vaca Cut – 53 – 300′
Seven Mile – 47 – 35,830′ The longest bridge.
Little Duck Missouri – 39.5 – 840′
Missouri-Ohio – 39 – 1,440′
Ohio-Bahia Honda – 38 – 1,050′
Bahia Honda – 36 – 6,734′
Spanish Harbor – 33.5 – 3,380′
North Pine – 29.5 – 660′
South Pine – 28.5 – 850′
Torch Key Viaduct – 28 – 880′
Torch-Ramrod – 27.5 – 720′
Nile Channel – 26 – 4,490′
Kemp’s Channel – 23.5 – 1,030′
Bow Channel – 20 – 1,340′
Park – 18.5 – 1,340′
North Harris – 18 – 430′
Harris Gap – 17.5 – 37′ The Shortest Bridge.
Harris – 16 – 430′
Lower Sugar Loaf – 15.5 – 1,260′
Saddle Bunch 2 – 14.5 – 660′
Saddle Bunch 3 – 14 – 760′
Saddle Bunch 4 – 13 – 900′
Saddle Bunch 5 – 12.5 – 900′
Shark Channel – 11.8 – 2,090′
Rockland Channel – 10 – 1,280′
Boca Chica – 6 – 2,730′
Stock Island – 5 – 360′
Key West – 4 – 159′