U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8726833 PUBLICATION DATE: 04/01/2004
Name: SUTHERLAND BAYOU, PALM HARBOR
FL
NOAA Chart: 11412 Latitude: 28° 5.1' N ( 28.08500)
USGS Quad: DUNEDIN Longitude: 82° 46.3' W ( -82.77170)
To reach the tidal bench marks from the intersection of U.S. Alt. Route 19 (10th
Street) and Delaware Avenue in Palm Harbor, proceed north on U.S. Alt. Route 19
for about 0.8 km (0.5 mi) to a drive leading to Palm Harbor Fishing Lodge, then
turn left onto the drive and continue past the railroad tracks to the
waterfront. The bench marks are located along U.S. Alt. Route 19 between
Delaware Avenue and the drive. The tide gage and staff were located on a dock
at the Palm Harbor Fishing Lodge.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 6833 A
DESIGNATION: 872 6833 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 7622
AGENCY: National Ocean Survey (NOS) IDB PID#: AL7394
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 28° 5.2' N ( 28.08670) LONGITUDE: 82° 46.2' W ( -82.77000)
The primary bench mark is a disk located 0.5 km (0.3 mi) NW of bench mark 6833 C
1976, 10.52 m (34.5 ft) SW of the centerline of U.S. Alt. Route 19, 8.99 m (29.5
ft) NE of the centerline of the railroad tracks, and 2.53 m (8.3 ft) SE of
utility pole #12A-5811R with a witness sign. The bench mark is 9 cm (0.3 ft)
below the ground, crimped to the top of a copper-clad steel rod driven an
unspecified depth to refusal, and encased in a PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8726833 PUBLICATION DATE: 04/01/2004
Name: SUTHERLAND BAYOU, PALM HARBOR
FL
NOAA Chart: 11412 Latitude: 28° 5.1' N ( 28.08500)
USGS Quad: DUNEDIN Longitude: 82° 46.3' W ( -82.77170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6833 B 1976
DESIGNATION: 872 6833 B
MONUMENTATION: Tidal Station disk VM#: 7620
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 28° 5.1' N ( 28.08500) LONGITUDE: 82° 46.2' W ( -82.77000)
The bench mark is a disk located 0.2 km (0.1 mi) NNW of bench mark 6833 C 1976,
10.58 m (34.7 ft) NE of the centerline of the railroad tracks, 8.63 m (28.3 ft)
SW of the centerline of U.S. Highway Alt. 19, and 0.43 m (1.4 ft) SE of utility
pole #13A-5805R with witness sign. The bench mark is 15 m (0.5 ft) below ground
level, crimped to a copper-clad steel rod driven an unspecified depth to
refusal, and encased in a PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 6833 C 1976
DESIGNATION: 872 6833 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 7621
AGENCY: National Ocean Survey (NOS) IDB PID#: AL7393
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 28° 5.1' N ( 28.08500) LONGITUDE: 82° 46.1' W ( -82.76830)
The bench mark is a disk located at the intersection of U.S. Alt. Route 19 and
Missouri Avenue, 0.08 km (0.05 mi) NW of Bench Mark OZONA G, 11 m (35 ft) west
of the centerline of U.S. Highway Alt. 19, 7.83 m (25.7 ft) east of the
centerline of the railroad tracks, and 6 m (21 ft) south of the centerline of
Missouri Avenue. The bench mark is 6 cm (0.2 ft) below the ground level,
crimped to a copper-clad steel rod driven to an unspecified depth to refusal,
and encased in a PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8726833 PUBLICATION DATE: 04/01/2004
Name: SUTHERLAND BAYOU, PALM HARBOR
FL
NOAA Chart: 11412 Latitude: 28° 5.1' N ( 28.08500)
USGS Quad: DUNEDIN Longitude: 82° 46.3' W ( -82.77170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: OZONA G
DESIGNATION: OZONA G
MONUMENTATION: Bench Mark disk VM#: 7624
AGENCY: Pinellas County IDB PID#: AL0281
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 28° 5.0' N ( 28.08330) LONGITUDE: 82° 46.0' W ( -82.76670)
The bench mark is a disk set in the top of a concrete monument located at the
intersection of Delaware Avenue and U.S. Alt. Route 19, 14.84 m (48.7 ft) south
of the centerline of Delaware Avenue, 13 m (42 ft) NW of a 1 m (2 ft) diameter
pine tree, 8.08 m (26.5 ft) east of the centerline of U.S. Highway Alt. 19, 0.61
m (2.0 ft) NW of a 0.37 m (1.2 ft) diameter palm tree.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8726833 PUBLICATION DATE: 04/01/2004
Name: SUTHERLAND BAYOU, PALM HARBOR
FL
NOAA Chart: 11412 Latitude: 28° 5.1' N ( 28.08500)
USGS Quad: DUNEDIN Longitude: 82° 46.3' W ( -82.77170)
T I D A L D A T U M S
Tidal datums at SUTHERLAND BAYOU, PALM HARBOR based on:
LENGTH OF SERIES: 1 MONTH
TIME PERIOD: March 1976 - March 1976
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8726724 CLEARWATER BEACH, GULF OF MEXICO
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.928
MEAN HIGH WATER MHW = 0.814
North American Vertical Datum NAVD88 = 0.593
MEAN SEA LEVEL MSL = 0.493
MEAN TIDE LEVEL MTL = 0.490
MEAN LOW WATER MLW = 0.166
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
6833 A 1.333 0.519
6833 B 1976 2.815 2.001
6833 C 1976 3.983 3.169
OZONA G 5.576 4.762
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8726833 PUBLICATION DATE: 04/01/2004
Name: SUTHERLAND BAYOU, PALM HARBOR
FL
NOAA Chart: 11412 Latitude: 28° 5.1' N ( 28.08500)
USGS Quad: DUNEDIN Longitude: 82° 46.3' W ( -82.77170)
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.