U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
PUBLICATION DATE: 09/22/1987
Station ID: 8725747 SUPERCEDED DATE: 04/21/2003
Name: ENGLEWOOD, LEMON BAY
FLORIDA
NOAA Chart: 11425 Latitude: 26° 56.0' N
USGS Quad: ENGLEWOOD Longitude: 82° 21.2' W
To reach the tidal bench marks from the town of Englewood, proceed south on
Florida Route 775 until reaching the junction of Florida Route 776, continue SW
on Florida Route 776 to the Tom Adams Bridge. The tide gage was located west of
the bridge tender house. The bench marks are located in the vicinity of the
bridge.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: NO 1 1973
MONUMENTATION: Survey Disk VM#: 6048
AGENCY: PID#: AG7835
SETTING CLASSIFICATION: Concrete Culvert Abutment
The bench mark is 195 feet (59 m) SW of the end of the SE bridge abutment, 30
feet (9 m) SE of the centerline of the highway, 18 feet (5.5 m) SW of the SE end
of a concrete seawall, 10 feet (3 m) south of the Tom Adams Bridge monument, 10
feet (3 m) SE of a manhole cover, and 1 foot (0.3 m) below highway level in the
top of a 9.5 foot (2.9 m) long concrete culvert abutment.
BENCH MARK STAMPING: IWCH 21 1965
MONUMENTATION: Survey Disk VM#: 6047
AGENCY: PID#: AG7833
SETTING CLASSIFICATION: Sidewalk
The bench mark is set flush in the center of the sidewalk between the bridge
guard rail and the concrete sidewalk rail on the SE side of the Tom Adams
Bridge, 105 feet (32.0 m) SW of the drawbridge span, and 65 feet (20 m) NE of
the SW traffic lift gate.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
PUBLICATION DATE: 09/22/1987
Station ID: 8725747 SUPERCEDED DATE: 04/21/2003
Name: ENGLEWOOD, LEMON BAY
FLORIDA
NOAA Chart: 11425 Latitude: 26° 56.0' N
USGS Quad: ENGLEWOOD Longitude: 82° 21.2' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 6 1976
MONUMENTATION: Survey Disk VM#: 6049
AGENCY: PID#: AG7831
SETTING CLASSIFICATION: Copper-clad Rod
The bench mark is located on the eastern side of the Tom Adams Bridge, and north
of Florida 776, 53 feet (16 m) east of the COE Intercoastal Waterway sign, 35.5
feet (11 m) SE of utility pole #1398, 26 feet (8 m) north of the centerline of
Florida 776, 6 feet (2 m) north of the northern road curb, and 1.8 feet (0.5 m)
west of the western face of the Tom Adams Bridge Monument. The bench mark is
set on the top of a copper-clad steel rod driven to refusal, inside a PVC pipe
surrounded by concrete.
BENCH MARK STAMPING: NO 7 1976
MONUMENTATION: Survey Disk VM#: 6050
AGENCY: PID#: AG7829
SETTING CLASSIFICATION: Copper-clad Rod
The bench mark is located 0.1 mile (0.2 km) east of the Englewood Bait House,
28.7 feet (8.7 m) NW of the centerline of Florida 776, and 1.3 feet (0.4 m) SE
of concrete power pole #R 73129. The bench mark is set on the top of a
copper-clad steel rod driven to refusal, inside a PVC pipe surrounded by
concrete and level with the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
PUBLICATION DATE: 09/22/1987
Station ID: 8725747 SUPERCEDED DATE: 04/21/2003
Name: ENGLEWOOD, LEMON BAY
FLORIDA
NOAA Chart: 11425 Latitude: 26° 56.0' N
USGS Quad: ENGLEWOOD Longitude: 82° 21.2' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: FLORIDA SRD (SEAWALL)
MONUMENTATION: Survey Disk VM#: 6051
AGENCY: PID#: AG7830
SETTING CLASSIFICATION: Seawall
The bench mark is set flush in the top of a seawall at the NE corner of the Tom
Adams Bridge, 20 feet (6 m) west of the end of the NE abutment, 18 feet (5.5 m)
NE of the north side of the bridge, 8 feet (2 m) below the bridge deck, and 0.5
foot (0.2 m) from the offshore edge.
BENCH MARK STAMPING: FLORIDA SRD (NW)
MONUMENTATION: Survey Disk VM#: 6052
AGENCY: PID#: AG7832
SETTING CLASSIFICATION: Concrete Bridge Curb
The bench mark is set flush in the top center of the 1 foot (0.3 m) high
concrete bridge curb supporting a metal guard rail at the NW corner of the Tom
Adams Bridge, 10 feet (3 m) south of the north end of the abutment, 4 feet (1 m)
SE of the concrete hand rail, and 1 foot (0.3 m) SW of the seam at the NE end of
the bridge and the start of the highway.
BENCH MARK STAMPING: FLORIDA SRD (SW)
MONUMENTATION: Survey Disk VM#: 6053
AGENCY: PID#: AG7834
SETTING CLASSIFICATION: Concrete Walkway Curb
The bench mark is set flush in the top center of the SW concrete walkway curb on
the Tom Adams Bridge, 90 feet (27 m) north of Bench Mark Florida SRD (NW), 10
feet (3 m) north of the end of the SE bridge abutment, 4 feet (1 m) NW of a
concrete hand rail, and 1 foot (0.3 m) NE of the seam at the SW end of the
bridge and the start of the highway.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
PUBLICATION DATE: 09/22/1987
Station ID: 8725747 SUPERCEDED DATE: 04/21/2003
Name: ENGLEWOOD, LEMON BAY
FLORIDA
NOAA Chart: 11425 Latitude: 26° 56.0' N
USGS Quad: ENGLEWOOD Longitude: 82° 21.2' W
T I D A L D A T U M S
Tidal datums at ENGLEWOOD, LEMON BAY based on:
LENGTH OF SERIES: 10 MONTHS
TIME PERIOD: MARCH 1976-FEBRUARY 1977
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8725110 NAPLES
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (05/15/1976) = 3.17
MEAN HIGHER HIGH WATER MHHW = 1.61
MEAN HIGH WATER MHW = 1.36
MEAN TIDE LEVEL MTL = 0.83
MEAN LOW WATER MLW = 0.31
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (01/19/1977) = -1.08
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
NO 1 1973 5.62 4.26
IWCH 21 1965 27.69 26.33
NO 6 1976 7.37 6.01
NO 7 1976 2.26 0.90
FLORIDA SRD (SEAWALL) 4.55 3.19
FLORIDA SRD (NW) 13.32 11.96
FLORIDA SRD (SW) 13.06 11.70
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
PUBLICATION DATE: 09/22/1987
Station ID: 8725747 SUPERCEDED DATE: 04/21/2003
Name: ENGLEWOOD, LEMON BAY
FLORIDA
NOAA Chart: 11425 Latitude: 26° 56.0' N
USGS Quad: ENGLEWOOD Longitude: 82° 21.2' W
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 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.