Boot Key Harbor bridge, Boot Key, FL tide times
NOAA tide prediction station 8723971, 24.7033° N, 81.1050° W. Heights in feet above MLLW.
Today at Boot Key Harbor bridge, Boot Key, FL
Today's predicted high and low waters, sunrise and sunset for Boot Key Harbor bridge, Boot Key, FL load here from NOAA. Without JavaScript they cannot be shown: NOAA's own table for station 8723971 is at tidesandcurrents.noaa.gov. Everything else on this page is measured and does not change from day to day.
What the tide does at Boot Key Harbor bridge, Boot Key, FL
Across the 1411 high and low waters NOAA predicts here for 2027, high water averages 1.7 ft above MLLW and low water 0.19 ft — a mean range of 1.51 ft. Taking each day's higher high and lower low, which is the swing someone standing on the shore actually sees, the average is 2.01 ft.
On 93% of days in 2027 there are two high waters and on the remaining 24 days only one. Where there are two, they differ in height by 0.7 ft on average. Successive high waters are 12h 25m apart on average.
The largest daily swing of 2027 is 2.88 ft on 4 July 2027 and the smallest is 0.98 ft on 31 March 2027 , a factor of 2.9 between the biggest spring tide and the smallest neap.
Measured figures
| Mean high water | 1.7 ft above MLLW |
|---|---|
| Mean low water | 0.19 ft above MLLW |
| Mean range | 1.51 ft |
| Mean great diurnal range | 2.01 ft |
| Largest daily range in 2027 | 2.88 ft on 4 July 2027 |
| Smallest daily range in 2027 | 0.98 ft on 31 March 2027 |
| Highest predicted tide | 2.8 ft at 9:08 PM on 29 October 2027 |
| Lowest predicted tide | -0.52 ft at 2:10 AM on 21 January 2027 |
| Average gap between high waters | 12h 25m |
| Tidal pattern | mixed, mainly semidiurnal (1.93 high waters a day) |
| Position | 24.7033° N, 81.1050° W |
| NOAA station id | 8723971 |
Every figure above is computed from NOAA's published predictions for station 8723971 for the whole of 2027 (365 days, 1411 tides), not from a regional average or an estimate.
What MLLW means here
Every height on this page is feet above MLLW — mean lower low water, the chart datum NOAA publishes tide predictions against. It is the average of the lower of each day's low waters, taken over a 19-year period, so zero here is neither the sea bed nor the average sea level: it is a level the water drops below regularly. At Boot Key Harbor bridge, Boot Key, FL, 198 of the 705 low waters predicted for 2027 — 28% of them — fall below zero, the lowest being -0.52 ft on 21 January 2027.
Practically: a chart showing 6 ft of water here means about 6 ft at a mean lower low water and about 8.0 ft at a mean higher high. Add the predicted height for the moment you care about to the charted depth.
Where these predictions come from
This is a subordinate station. NOAA does not run a separate harmonic analysis here; it takes the predictions for Key West, FL, 73 km (45 miles) away and shifts them. High water arrives 1 h 3 min earlier than the reference station and low water 37 min earlier than it. Heights are the reference station's multiplied by 1.13 at high water and 0.75 at low water.
Those constants are NOAA's own, published for station 8723971 (reference 8724580). They are why a subordinate station's table is never simply its neighbour's.
Daylight at this latitude
Boot Key Harbor bridge, Boot Key, FL sits at 24.7033° N. The longest day of 2027 here is 13h 40m of daylight on 21 June 2027; the shortest is 10h 36m on 21 December 2027 — a difference of 3h 04m.
Day lengths are computed with NOAA's published solar algorithm from the station's latitude and longitude. Clock times for sunrise and sunset are deliberately not printed here: they depend on the station's UTC offset, and this site takes that offset from NOAA's own answers rather than from a timezone table — so it is the live panel above, which has them, that shows the times.
Nearest other stations
- Vaca Key, USCG Station, Florida Bay, FL 0.9 km (0.5 miles)
- Knight Key Channel, Knight Key, Florida Bay, FL 2.1 km (1.3 miles)
- Pigeon Key, south side, Hawk Channel, FL 5.1 km (3.1 miles)
- Pigeon Key, north side, Florida Bay, FL 5.2 km (3.2 miles)
- Vaca Key-Fat Deer Key bridge, FL 8.1 km (5.1 miles)
- Sombrero Key, Hawk Channel, FL 8.5 km (5.3 miles)
Put these tides on your own site
One line of HTML shows today's tides for Boot Key Harbor bridge, Boot Key, FL on any page:
<script src="https://tidedata.romermade.com/v1/embed.js" data-station="8723971" defer></script>No account, no key, no build step. How it works.