U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8724517 PUBLICATION DATE: 01/23/2004
Name: KEY HAVEN WEST
FL
NOAA Chart: 11441 Latitude: 24° 34.8' N ( 24.58000)
USGS Quad: BOCA CHICA KEY Longitude: 81° 44.3' W ( -81.73830)
To reach the tidal bench marks from the west end of Boca Chica Channel Bridge in
Key West, proceed west on U.S. Highway 1, 1.1 km (0.7 mi) to Key Haven Road,
then turn right and proceed north on Key Haven Road for 0.8 km (0.5 mi). The
bench marks are located along Key Haven Road. The tide gage and staff were
located on a dock at 113 Key Haven Road.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: NO 1 1974
DESIGNATION: 872 4517 TIDAL 1
MONUMENTATION: Tidal Station disk VM#: 11015
AGENCY: National Ocean Survey (NOS) IDB PID#: AA1020
SETTING CLASSIFICATION: Concrete sidewalk OPUS PID:
LATITUDE: 24° 34.8' N ( 24.58000) LONGITUDE: 81° 44.3' W ( -81.73830)
The primary bench mark is a disk set flush in the concrete sidewalk located in
line with the property line between 117 Key Haven Road and 119 Key Haven Road,
26 m (85 ft) WNW of bench mark NO 2 1974, 8.99 m (29.5 ft) west of the
centerline of Key Haven Road, 1.13 m (3.7 ft) west of the east side of the
sidewalk, and 0.15 m (0.5 ft) above road level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8724517 PUBLICATION DATE: 01/23/2004
Name: KEY HAVEN WEST
FL
NOAA Chart: 11441 Latitude: 24° 34.8' N ( 24.58000)
USGS Quad: BOCA CHICA KEY Longitude: 81° 44.3' W ( -81.73830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 2 1974
DESIGNATION: 872 4517 TIDAL 2
MONUMENTATION: Tidal Station disk VM#: 11013
AGENCY: National Ocean Survey (NOS) IDB PID#: AA1019
SETTING CLASSIFICATION: Concrete sidewalk OPUS PID:
LATITUDE: 24° 34.8' N ( 24.58000) LONGITUDE: 81° 44.3' W ( -81.73830)
The bench mark is a disk set flush in the concrete sidewalk, 26.40 m (86.6 ft)
SE of the property line between 86 Key Haven Road and 84 Key Haven Road, 24.44 m
(80.2 ft) NE of bench mark NO 3 1974, 7.77 m (25.5 ft) east of the centerline of
Key Haven Road, 4.69 m (15.4 ft) east of the center of a manhole cover, and 0.15
m (0.5 ft) above road level.
BENCH MARK STAMPING: NO 4 1974
DESIGNATION: 872 4517 TIDAL 4
MONUMENTATION: Tidal Station disk VM#: 11014
AGENCY: National Ocean Survey (NOS) IDB PID#: AA1018
SETTING CLASSIFICATION: Concrete sidewalk OPUS PID:
LATITUDE: 24° 34.8' N ( 24.58000) LONGITUDE: 81° 44.3' W ( -81.73830)
The bench mark is a disk set flush in the concrete sidewalk located between 82
Key Haven Road and 80 Key Haven Road, 91 m (300 ft) WNW of the centerline of
Bougainvilla Road, 49.53 m (162.5 ft) ENE of bench mark NO 3 1974, 8.69 m (28.5
ft) NNE of the centerline of Key Haven Road, 7.74 m (25.4 ft) SSW of the SW
corner of the residence at 82 Key Haven Road, and 0.15 m (0.5 ft) above road
level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8724517 PUBLICATION DATE: 01/23/2004
Name: KEY HAVEN WEST
FL
NOAA Chart: 11441 Latitude: 24° 34.8' N ( 24.58000)
USGS Quad: BOCA CHICA KEY Longitude: 81° 44.3' W ( -81.73830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 3 1974
DESIGNATION: 872 4517 TIDAL 3
MONUMENTATION: Tidal Station disk VM#: 11016
AGENCY: National Ocean Survey (NOS) IDB PID#: AA1021
SETTING CLASSIFICATION: Concrete sidewalk OPUS PID:
LATITUDE: 24° 34.8' N ( 24.58000) LONGITUDE: 81° 44.3' W ( -81.73830)
The bench mark is a disk set flush in the concrete sidewalk located near the
property line between 115 Key Haven Road and 113 Key Haven Road, 42 m (139 ft)
SSE of bench mark NO 1 1974, 24.44 m (80.2 ft) SW of bench mark NO 2 1974, 9.08
m (29.8 ft) west of the centerline of Key Haven Road, 2.38 m (7.8 ft) north of
the north edge of the driveway for 113 Key Haven Road, and 0.15 m (0.5 ft) above
road level.
BENCH MARK STAMPING: NO 5 1974
DESIGNATION: 872 4517 TIDAL 5
MONUMENTATION: Tidal Station disk VM#: 11017
AGENCY: National Ocean Survey (NOS) IDB PID#: AA1017
SETTING CLASSIFICATION: Concrete sidewalk OPUS PID:
LATITUDE: 24° 34.8' N ( 24.58000) LONGITUDE: 81° 44.3' W ( -81.73830)
The bench mark is a disk set flush in the concrete sidewalk, 59 m (195 ft) SE of
bench mark NO 4 1974, 37 m (123 ft) west of the intersection of Bougainvilla and
Key Haven Roads, 8.78 m (28.8 ft) SSW of the centerline of Key Haven Road, 1.46
m (4.8 ft) ESE of the SE edge of the driveway for 105 Key Haven Road, and 0.15 m
(0.5 ft) above road level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8724517 PUBLICATION DATE: 01/23/2004
Name: KEY HAVEN WEST
FL
NOAA Chart: 11441 Latitude: 24° 34.8' N ( 24.58000)
USGS Quad: BOCA CHICA KEY Longitude: 81° 44.3' W ( -81.73830)
T I D A L D A T U M S
Tidal datums at KEY HAVEN WEST based on:
LENGTH OF SERIES: 1 MONTH
TIME PERIOD: January 1975 - January 1975
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8724580 KEY WEST
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.418
North American Vertical Datum NAVD88 = 0.385
MEAN HIGH WATER MHW = 0.336
MEAN SEA LEVEL MSL = 0.200
MEAN TIDE LEVEL MTL = 0.196
MEAN LOW WATER MLW = 0.056
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
NO 1 1974 1.187 0.851
NO 2 1974 1.199 0.863
NO 4 1974 1.267 0.931
NO 3 1974 1.157 0.821
NO 5 1974 1.229 0.893
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8724517 PUBLICATION DATE: 01/23/2004
Name: KEY HAVEN WEST
FL
NOAA Chart: 11441 Latitude: 24° 34.8' N ( 24.58000)
USGS Quad: BOCA CHICA KEY Longitude: 81° 44.3' W ( -81.73830)
D E F I N I T I O N S
Mean Sea Level (MSL) is a tidal datum determined over a 19-year National Tidal
Datum Epoch. It pertains to local mean sea level and should not be confused
with the fixed datums of North American Vertical Datum of 1988 (NAVD88).
NAVD88 is a fixed datum derived from a simultaneous, least squares, minimum
constraint adjustment of Canadian/Mexican/United States leveling observations.
Local mean sea level observed at Father Point/Rimouski, Canada was held fixed as
the single initial constraint. NAVD88 replaces NGVD29 as the national
standard geodetic reference for heights. Bench mark elevations relative to
NAVD88 are available from NGS through the World Wide Web at
National Geodetic Survey.
NGVD29 is a fixed datum adopted as a national standard geodetic reference for
heights but is now considered superseded. NGVD29 is sometimes referred to as
Sea Level Datum of 1929 or as Mean Sea Level on some early issues of Geological
Survey Topographic Quads. NGVD29 was originally derived from a general
adjustment of the first-order leveling networks of the U.S. and Canada after
holding mean sea level observed at 26 long term tide stations as fixed.
Numerous local and wide-spread adjustments have been made since establishment in
1929. Bench mark elevations relative to NGVD29 are available from the National
Geodetic Survey (NGS) data base via the World Wide Web at
National Geodetic Survey.
NAVD88 and NGVD29 are fixed geodetic datums whose elevation relationships to
local MSL and other tidal datums may not be consistent from one location to
another.
The Vertical Mark Number (VM#) and PID# shown on the bench mark sheet are unique
identifiers for bench marks in the tidal and geodetic databases, respectively.
Each bench mark in either database has a single, unique VM# and/or PID# assigned.
Where both VM# and PID# are indicated, both tidal and geodetic elevations are
available for the bench mark listed. The NGS's Integrated Data Base (IDB PID)
provides geodetic datum based on traditionally leveled and bluebooked ties to
the National Spatial Reference System(NSRS) https://www.ngs.noaa.gov/datasheets/.
The NGS Online Positioning User Service (OPUS PID) provides geodetic datum based
on GPS position & tie it to the NSRS https://www.ngs.noaa.gov/OPUS/.
The NAVD88 elevation is shown on the Elevations of Tidal Datums Table Referred
to MLLW only when two or more of the bench marks listed have NAVD88 elevations.
The NAVD88 elevation relationship shown in the table is derived from an average
of several bench mark elevations relative to tide station datum. As a result of
this averaging, NAVD88 bench mark elevations computed indirectly from the tidal
datums elevation table may differ slightly from NAVD88 elevations listed for
each bench mark in the NGS database.