U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 8726159 PUBLICATION DATE: 05/12/2011
Name: WHITFIELD ESTATES, SARASOTA BAY
FL
NOAA Chart: 11424 Latitude: 27° 24.5' N ( 27.40830)
USGS Quad: BRADENTON Longitude: 82° 34.8' W ( -82.58000)
To reach the tidal bench marks from the intersection of US Highway 301 and State
Road 70, proceed 3.2 km (2.0 mi) south on U.S. highway 301 to Whitfield Avenue,
then 3.4 km (2.1 mi) west on Whitfield Avenue to Westmoreland Drive, continue
0.5 km (0.3 mi) NW on Westmoreland Drive to North Isles Drive, and then 0.2 km
(0.1 mi) SW on North Isles Drive to its end. The bench marks are located along
the seawall, Westmoreland Drive, and North Isles Drive. The tide gage and staff
were located on a privately owned pier.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 6159 A 1977
DESIGNATION: 872 6159 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 6134
AGENCY: National Ocean Survey (NOS) IDB PID#: AG7691
SETTING CLASSIFICATION: Concrete sea wall OPUS PID:
LATITUDE: 27° 24.6' N ( 27.41000) LONGITUDE: 82° 34.7' W ( -82.57830)
The primary bench mark is a disk set flush in a concrete sea wall, 16.46 m (54.0
ft) SW of the centerline of North Isles Drive, 13.26 m (43.5 ft) NW of the NW
corner of a swimming pool, 7.86 m (25.8 ft) east of the west end of the sea
wall, and 0.91 m (3.0 ft) SW of the NE edge of the south seawall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 8726159 PUBLICATION DATE: 05/12/2011
Name: WHITFIELD ESTATES, SARASOTA BAY
FL
NOAA Chart: 11424 Latitude: 27° 24.5' N ( 27.40830)
USGS Quad: BRADENTON Longitude: 82° 34.8' W ( -82.58000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6159 B 1977
DESIGNATION: 872 6159 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 6135
AGENCY: National Ocean Survey (NOS) IDB PID#: AG7692
SETTING CLASSIFICATION: Concrete sea wall OPUS PID#: AG7692
LATITUDE: 27° 24.6' N ( 27.41000) LONGITUDE: 82° 34.7' W ( -82.57830)
The bench mark is a disk set in a concrete sea wall, 15 m (50 ft) north of Bench
Mark 6159 A 1977, 10 m (34 ft) NW of the centerline of North Isles Drive, 9 m
(29 ft) east of the west end of the north sea wall, and 0.21 m (0.7 ft) west of
the east edge of the north sea wall.
BENCH MARK STAMPING: 6159 E 1977
DESIGNATION: 872 6159 E TIDAL
MONUMENTATION: Tidal Station disk VM#: 6137
AGENCY: National Ocean Survey (NOS) IDB PID#: AG7689
SETTING CLASSIFICATION: Concrete post OPUS PID:
LATITUDE: 27° 24.6' N ( 27.41000) LONGITUDE: 82° 34.7' W ( -82.57830)
The bench mark is a disk set in a concrete post along Westmoreland Drive, 11.64
m (38.2 ft) SSW of the south corner of a white block house #8158, 9 m (30 ft) NE
of the centerline of Westmoreland Drive, and 0.52 m (1.7 ft) west of a utility
pole and 0.12 m (0.4 ft) below ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 8726159 PUBLICATION DATE: 05/12/2011
Name: WHITFIELD ESTATES, SARASOTA BAY
FL
NOAA Chart: 11424 Latitude: 27° 24.5' N ( 27.40830)
USGS Quad: BRADENTON Longitude: 82° 34.8' W ( -82.58000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6159 F 1977
DESIGNATION: 872 6159 F TIDAL
MONUMENTATION: Tidal Station disk VM#: 6138
AGENCY: National Ocean Survey (NOS) IDB PID#: AG7690
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 27° 24.6' N ( 27.41000) LONGITUDE: 82° 34.7' W ( -82.57830)
The bench mark is a disk located 43 m (140 ft) east of bench mark 6159 B 1977,
30 m (100 ft) SW of the junction of North Isles Drive and Westmoreland Drive,
7.47 m (24.5 ft) NW of the centerline of North Isles Drive, 1.89 m (6.2 ft) SW
of a large clump of trees with shaggy bark, and 0.27 m (0.9 ft) SW of utility
pole #106. The bench mark is crimped to the top of a copper-clad steel rod
driven 12.2 m (40 ft) to refusal, and encased in a PVC pipe and concrete
kickblock.
BENCH MARK STAMPING: 6159 G 2008
DESIGNATION: 872 6159 G TIDAL
MONUMENTATION: Survey disk VM#: 19860
AGENCY: Florida Dept. of Environmental
Protection (FLDEP) IDB PID#: DL1848
SETTING CLASSIFICATION: Concrete curb OPUS PID#: DL1848
LATITUDE: 27° 24.6' N ( 27.41053) LONGITUDE: 82° 34.7' W ( -82.57803)
The bench mark is a disk located 30.4 m (99.8 ft) south of bench mark 6159 E
1977, 10.2 m (33.5 ft) SW of the centerline of Westmoreland Drive, 5.6 m (18.3
ft) SE of the centerline of North isle Drive, 3.7 m (12.0 ft) north of a fire
hydrant, and 0.9 m (3.0 ft) NW of the center of a 61 cm (24-inch) steel manhole
cover.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 8726159 PUBLICATION DATE: 05/12/2011
Name: WHITFIELD ESTATES, SARASOTA BAY
FL
NOAA Chart: 11424 Latitude: 27° 24.5' N ( 27.40830)
USGS Quad: BRADENTON Longitude: 82° 34.8' W ( -82.58000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: MAN 6 1982 BSM
DESIGNATION: MAN 6
MONUMENTATION: Survey disk VM#: 19861
AGENCY: Florida Dept. of Environmental
Protection (FLDEP) IDB PID#: AG7687
SETTING CLASSIFICATION: Concrete manhole box OPUS PID:
LATITUDE: 27° 25.1' N ( 27.41778) LONGITUDE: 82° 33.3' W ( -82.55478)
The bench mark is a disk set in the top of a 1.83 m x 1.83 m (6-ft by 6-ft)
concrete manhole box mark bearing 11.25 m (36.9 ft) south of the centerline of
Whitfield Avenue, 31.70 m (104 ft) east of the centerline of Pennsylvania
Avenue, 5.94 m (19.5 ft) NW of an electric breaker box (14a), and 25.30 m (83.0
ft) ENE of a power pole (5-1374-9930-0-6).
BENCH MARK STAMPING: ELEV 9.78
DESIGNATION: 9.78
MONUMENTATION: Survey disk VM#: 19862
AGENCY: Florida Dept. of Environmental
Protection (FLDEP) IDB PID#: AG7688
SETTING CLASSIFICATION: Concrete culvert headwall OPUS PID:
LATITUDE: 27° 24.8' N ( 27.41392) LONGITUDE: 82° 34.0' W ( -82.56669)
The bench mark is a disk set in the top of a large concrete headwall 0.30 m (1
ft) below the road, bearing 35.88 m (117.7 ft) NNW of the centerline of
Whitfield Avenue, 76.08 m (249.6 ft) ENE of the centerline of Willow Street,
20.83 m (94.6 ft) ESE of a concrete power pole, and 7.70 m (25.25 ft) SW of a
1.07 m (3.5-ft) diameter live oak tree.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 8726159 PUBLICATION DATE: 05/12/2011
Name: WHITFIELD ESTATES, SARASOTA BAY
FL
NOAA Chart: 11424 Latitude: 27° 24.5' N ( 27.40830)
USGS Quad: BRADENTON Longitude: 82° 34.8' W ( -82.58000)
T I D A L D A T U M S
Tidal datums at WHITFIELD ESTATES, SARASOTA BAY based on:
LENGTH OF SERIES: 1 MONTH
TIME PERIOD: September 1977 - September 1977
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8725943 BLACKBURN POINT
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.642
MEAN HIGH WATER MHW = 0.557
North American Vertical Datum NAVD88 = 0.516
MEAN SEA LEVEL MSL = 0.363
MEAN TIDE LEVEL MTL = 0.359
MEAN LOW WATER MLW = 0.161
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
6159 A 1977 1.653 1.096
6159 B 1977 1.683 1.126
6159 E 1977 1.733 1.176
6159 F 1977 1.880 1.323
6159 G 2008 1.602 1.045
MAN 6 1982 BSM 4.978 4.421
ELEV 9.78 3.129 2.572
Foot Notes:
Geodetic heights of the bench marks meet all NOAA/NOS/NGS quality control
standards for Second Order, Class 1 leveling. It is advised that a confirmation
set of levels be established for bench marks 6159 G 2008, ELEV 9.78, and MAN 6
1982 BSM to verify height differences before using tidal bench mark elevation
information.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 8726159 PUBLICATION DATE: 05/12/2011
Name: WHITFIELD ESTATES, SARASOTA BAY
FL
NOAA Chart: 11424 Latitude: 27° 24.5' N ( 27.40830)
USGS Quad: BRADENTON Longitude: 82° 34.8' W ( -82.58000)
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.