U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 9
Station ID: 8726537 PUBLICATION DATE: 03/18/2011
Name: APOLLO BEACH, HILLSBOROUGH BAY
FL
NOAA Chart: 11413 Latitude: 27° 47.2' N ( 27.78670)
USGS Quad: GIBSONTON Longitude: 82° 25.6' W ( -82.42670)
To reach the tidal bench marks from the intersection of U.S. Highway 41 and
Apollo Boulevard, proceed west on Apollo Boulevard for 3.70 km (2.3 mi) to the
T-road junction of Surfside Boulevard and the Holiday Inn. The bench marks are
around the Holiday Inn's parking lot and along the eastbound lane of Apollo
Boulevard. The gage and staff were located on the Tiki Cay Condominium dock.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 6537 G 1990
MONUMENTATION: Flange-encased Rod VM#: 11503
AGENCY: National Ocean Service (NOS) IDB PID#: AG9409
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 27° 47.1' N ( 27.78500) LONGITUDE: 82° 25.5' W ( -82.42500)
The primary bench mark is the top of a stainless steel rod located along the
west side of Apollo Boulevard, 0.32 km (0.2 mi) SE of bench mark 6537 E 1976,
21.28 m (69.8 ft) NW of the NW corner of a concrete block building, 14.63 m
(48.0 ft) southeast of a brick driveway at 1310, 9.63 m (31.6 ft) southwest of
the centerline of Apollo Beach Boulevard, 7.62 m (25.0 ft) northwest of a lot at
1309, 2.74 m (9.0 ft) southwest of the southeast end of a sidewalk, 1.16 m (3.8
ft) south of a square concrete power pole with 2 guy wires and 0.55 m (1.8 ft)
northeast of a carsonite witness post. The mark is a stainless steel rod driven
into the ground with a NOS logo cap recessed 0.30 m (1.0 ft) below the level of
the ground and below the level of Apollo Beach Boulevard, the datum point being
recessed 0.06 m (0.2 ft) below the level of the NOS logo cap. NOTE: A magnet
was placed inside of the NOS logo cap.
BENCH MARK STAMPING: 6537 A 1976
MONUMENTATION: Tidal Station disk VM#: 11499
AGENCY: National Ocean Survey (NOS) IDB PID#: AG6385
SETTING CLASSIFICATION: Concrete sidewalk OPUS PID:
LATITUDE: 27° 47.1' N ( 27.78500) LONGITUDE: 82° 25.6' W ( -82.42670)
The primary bench mark is a disk set in a concrete sidewalk at the NW edge of a
breezeway near the NW corner of Holiday Inn, 11.37 m (37.3 ft) SE of the sea
wall, 1.31 m (4.3 ft) SW of the parking lot curb, and 0.21 m (0.7 ft) SE of the
motel.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 9
Station ID: 8726537 PUBLICATION DATE: 03/18/2011
Name: APOLLO BEACH, HILLSBOROUGH BAY
FL
NOAA Chart: 11413 Latitude: 27° 47.2' N ( 27.78670)
USGS Quad: GIBSONTON Longitude: 82° 25.6' W ( -82.42670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6537 B 1976
MONUMENTATION: Tidal Station disk VM#: 11500
AGENCY: National Ocean Survey (NOS) IDB PID#: AG6386
SETTING CLASSIFICATION: Concrete light pole base OPUS PID:
LATITUDE: 27° 47.1' N ( 27.78500) LONGITUDE: 82° 25.5' W ( -82.42500)
The bench mark is a disk set in the NE corner of the concrete base for a light
pole, 80 m (261 ft) NE of bench mark 6537 C 1976, 23.10 m (75.8 ft) SE of the NE
corner of the Holiday Inn, 11.52 m (37.8 ft) NW of the centerline of Surfside
Boulevard, and 0.61 m (2.0 ft) above the pavement.
BENCH MARK STAMPING: 6537 C 1976
MONUMENTATION: Tidal Station disk VM#: 11501
AGENCY: National Ocean Survey (NOS) IDB PID#: AG6387
SETTING CLASSIFICATION: Concrete light pole base OPUS PID:
LATITUDE: 27° 47.0' N ( 27.78330) LONGITUDE: 82° 25.6' W ( -82.42670)
The bench mark is a disk set in the SE corner of the concrete base of a light
pole, 19.72 m (64.7 ft) SE of the SE corner of the Holiday Inn, 11.09 m (36.4
ft) NW of the centerline of Surfside Boulevard, and 0.61 m (2.0 ft) above the
pavement.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 9
Station ID: 8726537 PUBLICATION DATE: 03/18/2011
Name: APOLLO BEACH, HILLSBOROUGH BAY
FL
NOAA Chart: 11413 Latitude: 27° 47.2' N ( 27.78670)
USGS Quad: GIBSONTON Longitude: 82° 25.6' W ( -82.42670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6537 E 1976
MONUMENTATION: Tidal Station disk VM#: 11502
AGENCY: National Ocean Survey (NOS) IDB PID#: AG6388
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 27° 47.0' N ( 27.78330) LONGITUDE: 82° 25.6' W ( -82.42670)
The bench mark is a disk located at the NW corner of the westernmost entrance to
the Holiday Inn parking lot, 37.85 m (124.2 ft) SW of bench mark 6537 C 1976,
13.62 m (44.7 ft) south of the SE corner of the Holiday Inn, 5.97 m (19.6 ft) NW
of the centerline of Surfside Boulevard, and 0.27 m (0.9 ft) south of a witness
post. The bench mark is crimped to a copper-clad steel rod driven an unspecified
depth to refusal, and encased in a PVC pipe with concrete kickblock.
BENCH MARK STAMPING: V 694 2007
MONUMENTATION: Survey disk VM#: 19835
AGENCY: Florida Dept. of Environmental
Protection (FLDEP) IDB PID#: DL1725
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 27° 46.5' N ( 27.77458) LONGITUDE: 82° 24.1' W ( -82.40097)
The bench mark is a disk set in the top of a round concrete monument flush with
the ground and level with Dickman Road, located 24.78 m (81.3 ft) north of the
centerline of Apollo Beach Boulevard westbound lanes, 22.62 m (74.2 ft) south of
the approximate centerline of the SE entrance to the Apollo Beach Elementary
School, 14.78 m (48.5 ft) west of the centerline of Dickman Road, 3.57 m (11.7
ft) south of a square concrete power pole #131798 (27027, 35082) with 7 guy
wires and one light attached, 0.67 m (2.2 ft) west of a carsonite witness post,
and 0.18 m (0.6 ft) east of the east side of the side walk. NOTE: A magnet was
imbedded in the ground on the east side of the monument.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 9
Station ID: 8726537 PUBLICATION DATE: 03/18/2011
Name: APOLLO BEACH, HILLSBOROUGH BAY
FL
NOAA Chart: 11413 Latitude: 27° 47.2' N ( 27.78670)
USGS Quad: GIBSONTON Longitude: 82° 25.6' W ( -82.42670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: W 694 2007
MONUMENTATION: Survey disk VM#: 19836
AGENCY: Florida Dept. of Environmental
Protection (FLDEP) IDB PID#: DL1726
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 27° 46.6' N ( 27.77636) LONGITUDE: 82° 24.9' W ( -82.41581)
The bench mark is a disk set in the top of a round concrete monument recessed
0.30 m (0.1 ft) below the level of the ground and below the level of Apollo
Beach Boulevard, located in the median, 33.53 m (110.0 ft) NW of the approximate
centerline of a median crossover and the extended centerline of Lake Sunrise
Drive (a dead end street south), 6.95 m (22.8 ft) NNE of the centerline of
Apollo Beach Boulevard eastbound lanes, 5.18 m (17.0 ft) SSW of the centerline
of Apollo Beach Boulevard westbound lanes, and 1.68 m (5.5 ft) SE of a square
concrete power pole #131686 (26550, 35158), and a carsonite witness post. NOTE:
A magnet was imbedded in the ground on the south side of the monument.
BENCH MARK STAMPING: 6537 H 2007
MONUMENTATION: Survey disk VM#: 19837
AGENCY: Florida Dept. of Environmental
Protection (FLDEP) IDB PID#: DL1727
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 27° 46.9' N ( 27.78189) LONGITUDE: 82° 25.5' W ( -82.42492)
The bench mark is a disk set in the top of a round concrete monument flush with
the ground and about level with Apollo Beach Boulevard, located 24.17 m (79.3
ft) SE of the centerline of Surfside Boulevard, 5.82 m (19.1 ft) NE of Apollo
Beach Boulevard (leading east), 2.23 m (7.3 ft) SW of concrete light pole
#131711, and 2.19 m (7.2 ft) SW of a carsonite witness post. NOTE: A magnet was
imbedded in the ground on the south side of the monument.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 9
Station ID: 8726537 PUBLICATION DATE: 03/18/2011
Name: APOLLO BEACH, HILLSBOROUGH BAY
FL
NOAA Chart: 11413 Latitude: 27° 47.2' N ( 27.78670)
USGS Quad: GIBSONTON Longitude: 82° 25.6' W ( -82.42670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6537 J 2007
MONUMENTATION: Survey disk VM#: 19838
AGENCY: Florida Dept. of Environmental
Protection (FLDEP) IDB PID#: DL1728
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 27° 47.1' N ( 27.78456) LONGITUDE: 82° 25.5' W ( -82.42511)
The bench mark is a disk set in the top of a round concrete monument flush with
the ground and about 0.24 m (0.8 ft ) above the level of Surfside Boulevard,
8.84 m (29.0 ft) SE of the centerline of Surfside Boulevard, 7.07 m (23.2 ft) NW
of the centerline of Apollo Beach Boulevard, 1.10 m (3.6 ft) NE of a concrete
power pole #131707, and 1.07 m (3.5 ft) NE of a carsonite witness post. NOTE: A
magnet was imbedded in the ground on the south side of the monument.
BENCH MARK STAMPING: 6537 K 2007
MONUMENTATION: Survey disk VM#: 19839
AGENCY: Florida Dept. of Environmental
Protection (FLDEP) IDB PID#: DL1729
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 27° 47.2' N ( 27.78644) LONGITUDE: 82° 25.4' W ( -82.42314)
The bench mark is a disk set in the top of a round concrete monument flush with
the ground and about level with Surfside Boulevard, 31.0 ft (9.45 m) SW of the
centerline of Cobia Cay Drive, 8.44 m (27.7 ft) SE of the centerline of Surfside
Boulevard, 0.40 m (1.3 ft) NW of a concrete light pole #35181, and 0.37 m (1.2
ft) NW of a carsonite witness post. NOTE: A magnet was imbedded in the ground
on the south side of the monument.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 9
Station ID: 8726537 PUBLICATION DATE: 03/18/2011
Name: APOLLO BEACH, HILLSBOROUGH BAY
FL
NOAA Chart: 11413 Latitude: 27° 47.2' N ( 27.78670)
USGS Quad: GIBSONTON Longitude: 82° 25.6' W ( -82.42670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6537 L 2007
MONUMENTATION: Survey disk VM#: 19840
AGENCY: Florida Dept. of Environmental
Protection (FLDEP) IDB PID#: DL1730
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 27° 47.3' N ( 27.78856) LONGITUDE: 82° 25.3' W ( -82.42136)
The bench mark is a disk set in the top of a round concrete monument projecting
0.03 m (0.1 ft) above the level of the ground and about level with Surfside
Boulevard, 11.58 m (38.0 ft) NW of the centerline of Surfside Boulevard, 1.28 m
(4.2 ft) SW of the extended centerline of Beach Club lanes, 0.88 m (2.9 ft) SW
of a wooden fence, and 0.85 m (2.8 ft) SW of a carsonite witness post. NOTE: A
magnet was imbedded in the ground on the south side of the monument.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 9
Station ID: 8726537 PUBLICATION DATE: 03/18/2011
Name: APOLLO BEACH, HILLSBOROUGH BAY
FL
NOAA Chart: 11413 Latitude: 27° 47.2' N ( 27.78670)
USGS Quad: GIBSONTON Longitude: 82° 25.6' W ( -82.42670)
D A T U M S
Datums at APOLLO BEACH, HILLSBOROUGH BAY based on:
LENGTH OF SERIES: 6 MONTHS
TIME PERIOD: July 1990 - December 1990
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8726520 ST. PETERSBURG, TAMPA BAY
Elevations of datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.750
MEAN HIGH WATER MHW = 0.661
North American Vertical Datum NAVD88 = 0.509
MEAN SEA LEVEL MSL = 0.404
MEAN TIDE LEVEL MTL = 0.399
MEAN LOW WATER MLW = 0.136
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
6537 G 1990 1.998 1.337
6537 A 1976 2.975 2.314
6537 B 1976 2.869 2.208
6537 C 1976 3.076 2.415
6537 E 1976 2.637 1.976
V 694 2007 2.273 1.612
W 694 2007 2.115 1.454
6537 H 2007 2.649 1.988
6537 J 2007 2.640 1.978
6537 K 2007 3.156 2.495
6537 L 2007 2.881 2.220
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 8 of 9
Station ID: 8726537 PUBLICATION DATE: 03/18/2011
Name: APOLLO BEACH, HILLSBOROUGH BAY
FL
NOAA Chart: 11413 Latitude: 27° 47.2' N ( 27.78670)
USGS Quad: GIBSONTON Longitude: 82° 25.6' W ( -82.42670)
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 6537 H 2007, 6537 J 2007, 6537 K
2007, 6537 L 2007, V 694 2007, and W 694 2007 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 9 of 9
Station ID: 8726537 PUBLICATION DATE: 03/18/2011
Name: APOLLO BEACH, HILLSBOROUGH BAY
FL
NOAA Chart: 11413 Latitude: 27° 47.2' N ( 27.78670)
USGS Quad: GIBSONTON Longitude: 82° 25.6' W ( -82.42670)
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.