U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
PUBLICATION DATE: 12/16/1991
Station ID: 8726430 SUPERCEDED DATE: 04/21/2003
Name: ST. PETERSBURG BEACH, SOUTH END, GULF OF MEXICO
FLORIDA
NOAA Chart: 11414 Latitude: 27° 41.0' N
USGS Quad: PASS-A-GRILLE BEACH Longitude: 82° 44.3' W
To reach the tidal bench marks from Gulf Way in Pass-a-Grille Beach, proceed
south on Gulf Way to its end at 1st Avenue. Bench marks are along Gulf Way.
Tide gauge and staff were on the north side of the main deck of the concrete
groin running west from the west end of 1st Avenue.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 6430 A 1976
MONUMENTATION: Survey Disk VM#: 12121
AGENCY: PID#: AG7462
SETTING CLASSIFICATION: Concrete Pier
The primary bench mark is set in the SE corner of a concrete deck at the west
end of the fishing groin, 36 feet (11 m) east of the west end of the pier, and 2
feet (1 m) NW of the SE corner of the deck.
BENCH MARK STAMPING: 6430 B 1976
MONUMENTATION: Survey Disk VM#: 12122
AGENCY: PID#: AG7460
SETTING CLASSIFICATION: Copper-clad Steel Rod
The bench mark is at the west end of 4th Avenue, 19 feet (6 m) west of the
centerline of Gulf Way, 3 feet (1 m) east of concrete power pole #108780, and 2
feet (1 m) east of a witness post. The bench mark is crimped to a copper- clad
rod driven 40 feet (12 m) to refusal and encased in PVC pipe and concrete
kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
PUBLICATION DATE: 12/16/1991
Station ID: 8726430 SUPERCEDED DATE: 04/21/2003
Name: ST. PETERSBURG BEACH, SOUTH END, GULF OF MEXICO
FLORIDA
NOAA Chart: 11414 Latitude: 27° 41.0' N
USGS Quad: PASS-A-GRILLE BEACH Longitude: 82° 44.3' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 13 1972
MONUMENTATION: Survey Disk VM#: 12123
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Sidewalk
The bench mark is set in a concrete sidewalk bordering the beach at the south
end of Gulf Way, and 25.8 feet (7.9 m) west of the SW corner of the Pass-A-Grill
Apartment building which is at the intersection of Gulf Way and 1st Avenue.
BENCH MARK STAMPING: R 166 PNLS 1974
MONUMENTATION: Survey Disk VM#: 12124
AGENCY: PID#: AG7461
SETTING CLASSIFICATION: Concrete Sidewalk
The bench mark is set flush in a concrete sidewalk atop a sea wall bordering the
beach, 83.4 feet (25.4 m) west of the intersection of Gulf Way and 1st Avenue,
and 8.4 feet (2.6 m) west of a 3.5 foot (1.1 m) high wall.
BENCH MARK STAMPING: SHELL ER DL 1960
MONUMENTATION: Survey Disk VM#: 12125
AGENCY: PID#: AG0358
SETTING CLASSIFICATION: Concrete Sea Wall
The bench mark is set in the top of a concrete sea wall near the intersection of
Gulf Way and 9th Avenue, 114 feet (35 m) west of the centerline of Gulf Way,
58.5 feet (17.8 m) NW of concrete light pole #108771, 40 feet (12 m) east of the
SW corner of the concrete sea wall, and 33 feet (10 m) south of the extended
centerline of 9th Avenue.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
PUBLICATION DATE: 12/16/1991
Station ID: 8726430 SUPERCEDED DATE: 04/21/2003
Name: ST. PETERSBURG BEACH, SOUTH END, GULF OF MEXICO
FLORIDA
NOAA Chart: 11414 Latitude: 27° 41.0' N
USGS Quad: PASS-A-GRILLE BEACH Longitude: 82° 44.3' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NOAA-A
MONUMENTATION: Survey Disk VM#: 12126
AGENCY: PID#: AG0741
SETTING CLASSIFICATION: Concrete Monument
The bench mark is set in a concrete monument near the junction of 10th Avenue
and Gulf Way, on the extended centerline of 10th Avenue, 145.5 feet (44.3 m)
west of the centerline of Gulf Way, 24.3 feet (7.4 m) SE of the NW corner of the
sea wall, 12.0 feet (3.7 m) east of the sea wall, and 0.2 foot (0.1 m) above
ground level.
BENCH MARK STAMPING: 6430 G 1983
MONUMENTATION: Survey Disk VM#: 12421
AGENCY: PID#: AG7730
SETTING CLASSIFICATION: Concrete Monument
The bench mark is set in the top of a concrete monument, at the junction of 2nd
Avenue and Gulf Way, 34.7 feet (10.6 m) west of the centerline of Gulf Way, 17.3
feet (5.3 m) north of parking meter #11, 7.5 feet (2.3 m) SSE of concrete
powerline pole #108784, 3.3 feet (1.0 m) east of a 3-foot (1 m) high concrete
wall, in line with the centerline of 2nd Avenue, and at ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
PUBLICATION DATE: 12/16/1991
Station ID: 8726430 SUPERCEDED DATE: 04/21/2003
Name: ST. PETERSBURG BEACH, SOUTH END, GULF OF MEXICO
FLORIDA
NOAA Chart: 11414 Latitude: 27° 41.0' N
USGS Quad: PASS-A-GRILLE BEACH Longitude: 82° 44.3' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6430 H 1983
MONUMENTATION: Survey Disk VM#: 12422
AGENCY: PID#: AG7729
SETTING CLASSIFICATION: Concrete Monument
The bench mark is set in the top of a concrete monument, at the junction of 6th
Avenue and Gulf Way, 36.5 feet (11.1 m) south of the extended centerline of 6th
Avenue, 29.6 feet (9.0 m) west of the centerline of Gulf Way, 15.6 feet (4.8 m)
north of parking meter #39, 6.8 feet (2.1 m) south of parking meter #40, 2.8
feet (0.9 m) east of a 3-foot (1 m) high concrete wall, and 0.1 foot (0.03 m)
below ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
PUBLICATION DATE: 12/16/1991
Station ID: 8726430 SUPERCEDED DATE: 04/21/2003
Name: ST. PETERSBURG BEACH, SOUTH END, GULF OF MEXICO
FLORIDA
NOAA Chart: 11414 Latitude: 27° 41.0' N
USGS Quad: PASS-A-GRILLE BEACH Longitude: 82° 44.3' W
T I D A L D A T U M S
Tidal datums at ST. PETERSBURG BEACH, SOUTH END, GULF OF MEXICO based on:
LENGTH OF SERIES: 2 MONTHS
TIME PERIOD: JULY - AUGUST 1976
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8726724 CLEARWATER BEACH
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (07/09/1976) = 3.02
MEAN HIGHER HIGH WATER (MHHW) = 2.29
MEAN HIGH WATER (MHW) = 1.98
MEAN TIDE LEVEL (MTL) = 1.24
* NATIONAL GEODETIC VERTICAL DATUM-1929 (NGVD) = 0.81
MEAN LOW WATER (MLW) = 0.50
MEAN LOWER LOW WATER (MLLW) = 0.00
LOWEST OBSERVED WATER LEVEL (06/28/1976) = -0.58
* NGVD is based on elevations published in Quad HGZ L24736, September17,1982,
and NOS leveling of 1982.
National Geodetic Vertical Datum (NGVD 29)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
6430 A 1976 5.86 3.88
6430 B 1976 7.46 5.48
13 1972 6.05 4.07
R 166 PNLS 1974 7.89 5.91
SHELL ER DL 1960 7.81 5.83
NOAA-A 8.68 6.70
6430 G 1983 7.20 5.22
6430 H 1983 7.68 5.70
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
PUBLICATION DATE: 12/16/1991
Station ID: 8726430 SUPERCEDED DATE: 04/21/2003
Name: ST. PETERSBURG BEACH, SOUTH END, GULF OF MEXICO
FLORIDA
NOAA Chart: 11414 Latitude: 27° 41.0' N
USGS Quad: PASS-A-GRILLE BEACH Longitude: 82° 44.3' W
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 (NAVD 88).
NGVD 29 is a fixed datum adopted as a national standard geodetic reference for
heights but is now considered superseded. NGVD 29 is sometimes referred to as
Sea Level Datum of 1929 or as Mean Sea Level on some early issues of Geological
Survey Topographic Quads. NGVD 29 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 NGVD 29 are available from the National
Geodetic Survey (NGS) data base via the World Wide Web at
National Geodetic Survey.
NAVD 88 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. NAVD 88 replaces NGVD 29 as the national
standard geodetic reference for heights. Bench mark elevations relative to
NAVD 88 are available from NGS through the World Wide Web at
National Geodetic Survey.
NGVD 29 and NAVD 88 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 NAVD 88 elevation is shown on the Elevations of Tidal Datums Table Referred
to MLLW only when two or more of the bench marks listed have NAVD 88 elevations.
The NAVD 88 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, NAVD 88 bench mark elevations computed indirectly from the tidal
datums elevation table may differ slightly from NAVD 88 elevations listed for
each bench mark in the NGS database.