U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 8726699 PUBLICATION DATE: 03/16/2011
Name: PALM RIVER
FL
NOAA Chart: 11412 Latitude: 27° 56.9' N ( 27.94830)
USGS Quad: TAMPA Longitude: 82° 23.1' W ( -82.38500)
To reach the tidal bench marks from the intersection of U.S. Highway 41 (50th
Street) and State Highway 60 (South Crosstown Expressway) in Tampa, proceed 1.6
km (1.0 mi) east on State Highway 60 to the junction of Maydell Drive, then turn
right and proceed 0.3 km (0.2 mi) south on Maydell Drive to the bridge over Palm
River. The bench marks are located along the bridge. The tide gage and staff
were located on the concrete bulkhead of the bridge.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 6699 A 1977
DESIGNATION: 872 6699 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 7526
AGENCY: National Ocean Survey (NOS) IDB PID#: AG7548
SETTING CLASSIFICATION: Concrete bulkhead OPUS PID:
LATITUDE: 27° 56.9' N ( 27.94830) LONGITUDE: 82° 23.6' W ( -82.39330)
The primary bench mark is a disk set in top of a concrete bulkhead, 14 m (46 ft)
west of the centerline of Maydell Drive, 12.92 m (42.4 ft) SW of the SW corner
of the bridge, 12.34 m (40.5 ft) south of the NW corner of the bulkhead, 0.3 m
(1 ft) north of the south end of the bulkhead, and 1 m (4 ft) below the level of
the road.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 8726699 PUBLICATION DATE: 03/16/2011
Name: PALM RIVER
FL
NOAA Chart: 11412 Latitude: 27° 56.9' N ( 27.94830)
USGS Quad: TAMPA Longitude: 82° 23.1' W ( -82.38500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: FRB 205 1968 JACKSONVILLE FLA
DESIGNATION: FRB 205 USE
MONUMENTATION: Bench Mark disk VM#: 7525
AGENCY: US Army Corps of Engineers (USE) IDB PID#: AG7545
SETTING CLASSIFICATION: Concrete walkway OPUS PID:
LATITUDE: 27° 57.0' N ( 27.95000) LONGITUDE: 82° 23.6' W ( -82.39330)
The bench mark is a disk set in the bridge walkway at the NW end of the bridge,
4 m (14 ft) west of the centerline of Maydell Drive, 2 m (6 ft) north of the NW
corner of the bridge, and 0.6 m (2 ft) east of the inside edge of the bridge
rail.
BENCH MARK STAMPING: 6699 B 1977
DESIGNATION: 872 6699 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 7527
AGENCY: National Ocean Survey (NOS) IDB PID#: AG7547
SETTING CLASSIFICATION: Concrete walkway OPUS PID#: AG7547
LATITUDE: 27° 56.9' N ( 27.94830) LONGITUDE: 82° 23.6' W ( -82.39330)
The bench mark is a disk set in the bridge sidewalk at the SE end of the bridge,
4.72 m (15.5 ft) east of the centerline of Maydell Drive, 0.27 m (0.9 ft) north
of the south end of the bridge, and 0.15 m (0.5 ft) west of a concrete guard
rail.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 8726699 PUBLICATION DATE: 03/16/2011
Name: PALM RIVER
FL
NOAA Chart: 11412 Latitude: 27° 56.9' N ( 27.94830)
USGS Quad: TAMPA Longitude: 82° 23.1' W ( -82.38500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: N
DESIGNATION: N C OF TAMPA
MONUMENTATION: Survey disk VM#: 7528
AGENCY: City of Tampa IDB PID#: AG7544
SETTING CLASSIFICATION: Bridge walkway OPUS PID:
LATITUDE: 27° 57.0' N ( 27.95000) LONGITUDE: 82° 23.6' W ( -82.39330)
The bench mark is a disk set in the bridge walkway at the NW end of the bridge,
4 m (13 ft) west of the centerline of Maydell Drive, 1 m (3 ft) east of the
inside edge of the bridge rail, and 0.6 m (2 ft) north of the NW corner of the
bridge.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 8726699 PUBLICATION DATE: 03/16/2011
Name: PALM RIVER
FL
NOAA Chart: 11412 Latitude: 27° 56.9' N ( 27.94830)
USGS Quad: TAMPA Longitude: 82° 23.1' W ( -82.38500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: S
DESIGNATION: S C OF TAMPA
MONUMENTATION: Survey disk VM#: 7529
AGENCY: City of Tampa IDB PID#: AG7546
SETTING CLASSIFICATION: Bridge walkway OPUS PID:
LATITUDE: 27° 56.9' N ( 27.94830) LONGITUDE: 82° 23.6' W ( -82.39330)
The bench mark is a disk set in the bridge walkway, 16 m (51 ft) north of the SW
corner of the bridge, 5 m (15 ft) west of the centerline of Maydell Drive, and
0.34 m (1.1 ft) east of the inside edge of the bridge rail.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 8726699 PUBLICATION DATE: 03/16/2011
Name: PALM RIVER
FL
NOAA Chart: 11412 Latitude: 27° 56.9' N ( 27.94830)
USGS Quad: TAMPA Longitude: 82° 23.1' W ( -82.38500)
T I D A L D A T U M S
Tidal datums at PALM RIVER based on:
LENGTH OF SERIES: 2 MONTHS
TIME PERIOD: February 1977 - March 1977
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8726689 BAY ARISTOCRAT VILLAGE, OLD TAMPA BAY
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.854
MEAN HIGH WATER MHW = 0.744
MEAN SEA LEVEL MSL = 0.462
MEAN TIDE LEVEL MTL = 0.457
North American Vertical Datum NAVD88 = 0.252
MEAN LOW WATER MLW = 0.170
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
6699 A 1977 1.167 0.423
FRB 205 1968 JACKSONVILLE FLA 3.805 3.061
6699 B 1977 4.220 3.476
N 3.748 3.004
S 4.816 4.072
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 8726699 PUBLICATION DATE: 03/16/2011
Name: PALM RIVER
FL
NOAA Chart: 11412 Latitude: 27° 56.9' N ( 27.94830)
USGS Quad: TAMPA Longitude: 82° 23.1' W ( -82.38500)
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.