U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8726232 PUBLICATION DATE: 02/05/2004
Name: PERICO ISLAND
FL
NOAA Chart: 11414 Latitude: 27° 29.2' N ( 27.48670)
USGS Quad: BRADENTON BEACH Longitude: 82° 41.2' W ( -82.68670)
To reach the tidal bench marks from the Bradenton Post Office, proceed west on
State Route 64 (Manatee Avenue West) for 10.3 km (6.4 mi) to a dirt road that
runs south, then turn left and proceed south on the dirt road for 1.9 km (1.2
mi). The bench marks are located in the area along the dirt road. The tide gage
and staff were located on a platform out in Palma Sola Bay.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 6232 B 1977
DESIGNATION: 872 6232 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 6152
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Unspecified deep rod OPUS PID:
LATITUDE: 27° 29.2' N ( 27.48670) LONGITUDE: 82° 41.2' W ( -82.68670)
The primary bench mark is a disk 36.48 m (119.7 ft) NE of bench mark 6232 G
1983, 28.96 m (95.0 ft) ESE of bench mark 6232 H 1983, 24.69 m (81.0 ft) south
of bench mark 6232 E 1977, 17.37 m (57.0 ft) SW of bench mark 6232 C 1977, 15.91
m (52.2 ft) east of centerline of road, 1.55 m (5.1 ft) SW of a mangrove tree.
The bench mark is set 21 cm (0.7 ft) above ground level, crimped to an
unspecified deep rod driven to an unspecified depth.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8726232 PUBLICATION DATE: 02/05/2004
Name: PERICO ISLAND
FL
NOAA Chart: 11414 Latitude: 27° 29.2' N ( 27.48670)
USGS Quad: BRADENTON BEACH Longitude: 82° 41.2' W ( -82.68670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6232 C 1977
DESIGNATION: 872 6232 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 6153
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Post OPUS PID:
LATITUDE: 27° 29.2' N ( 27.48670) LONGITUDE: 82° 41.2' W ( -82.68670)
The bench mark is a disk 25.60 m (84.0 ft) east of the centerline of a dirt
road, 19.99 m (65.6 ft) SE of bench mark 6232 E 1977, 17.37 m (57.0 ft) NE of
bench mark 6232 B 1977, 2.23 m (7.3 ft) SW of a clump of Australian pine trees,
and 0.1 m (0.2 ft) below ground.
BENCH MARK STAMPING: 6232 E 1977
DESIGNATION: 872 6232 E TIDAL
MONUMENTATION: Tidal Station disk VM#: 6154
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Unspecified deep rod OPUS PID:
LATITUDE: 27° 29.2' N ( 27.48670) LONGITUDE: 82° 41.2' W ( -82.68670)
The bench mark is a disk 37.03 m (121.5 ft) NE of bench mark 6232 H 1983, 26.82
m (88.0 ft) east of a clump of three Australian pine trees, 24.69 m (81.0 ft)
north of bench mark 6232 B 1977, 19.99 m (65.6 ft) NW of bench mark 6232 C 1977,
15.24 m (50.0 ft) east of the centerline of the dirt road. The bench mark is set
20 cm (0.5 ft) above ground level, crimped to an unspecified deep rod driven to
an unspecified depth.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8726232 PUBLICATION DATE: 02/05/2004
Name: PERICO ISLAND
FL
NOAA Chart: 11414 Latitude: 27° 29.2' N ( 27.48670)
USGS Quad: BRADENTON BEACH Longitude: 82° 41.2' W ( -82.68670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6232 G 1983
DESIGNATION: 872 6232 G TIDAL
MONUMENTATION: Tidal Station disk VM#: 6155
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete post OPUS PID:
LATITUDE: 27° 29.2' N ( 27.48670) LONGITUDE: 82° 41.2' W ( -82.68670)
The bench mark is a disk set in concrete post located 36.48 m (119.7 ft) SW of
bench mark 6232 B 1977, 25.30 m (83.0 ft) SE of bench mark 6232 H 1983, 11.80 m
(38.7 ft) NNE of the SE end of an old concrete seawall, 6.40 m (21.0 ft) NE of
the seawall, and 0.1 m (0.2 ft) below ground.
BENCH MARK STAMPING: 6232 H 1983
DESIGNATION: 872 6232 H TIDAL
MONUMENTATION: Tidal Station disk VM#: 6156
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete post OPUS PID:
LATITUDE: 27° 29.2' N ( 27.48670) LONGITUDE: 82° 41.2' W ( -82.68670)
The bench mark is a disk set in a concrete post located 37.03 m (121.5 ft) SW of
bench mark 6232 E 1977, 28.96 m (95.0 ft) WNW of bench mark 6232 B 1977, 25.30 m
(83.0 ft) NW of bench mark 6232 G 1983, 18.78 m (61.6 ft) ENE of the NW end of
an old concrete seawall, 7.77 m (25.5 ft) SE of the water line, and 0.1 m (0.3
ft) below ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8726232 PUBLICATION DATE: 02/05/2004
Name: PERICO ISLAND
FL
NOAA Chart: 11414 Latitude: 27° 29.2' N ( 27.48670)
USGS Quad: BRADENTON BEACH Longitude: 82° 41.2' W ( -82.68670)
T I D A L D A T U M S
Tidal datums at PERICO ISLAND based on:
LENGTH OF SERIES: 4 MONTHS
TIME PERIOD: June 1977 - September 1977
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8726247 BRADENTON, MANATEE RIVER
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.639
MEAN HIGH WATER MHW = 0.557
MEAN SEA LEVEL MSL = 0.325
MEAN TIDE LEVEL MTL = 0.323
MEAN LOW WATER MLW = 0.090
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
6232 B 1977 0.920 0.363
6232 C 1977 0.972 0.415
6232 E 1977 1.070 0.513
6232 G 1983 0.907 0.350
6232 H 1983 0.766 0.209
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8726232 PUBLICATION DATE: 02/05/2004
Name: PERICO ISLAND
FL
NOAA Chart: 11414 Latitude: 27° 29.2' N ( 27.48670)
USGS Quad: BRADENTON BEACH Longitude: 82° 41.2' W ( -82.68670)
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.