U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 1 of 5
Station ID: 8726428 PUBLICATION DATE: 06/16/2004
Name: TIERRA VERDE
FLORIDA
NOAA Chart: 11414 Latitude: 27° 41.3' N
USGS Quad: PASS-A-GRILLE BEACH Longitude: 82° 43.1' W
To reach the tidal bench marks from the post office in St. Petersburg at the
intersection of 1st Avenue North and 4th Street, Travel west along 1st Avenue
north for 4.0 km (2.5 mi) to 34th Street (U.S. Route 19), travel south 5.8 km
(3.6 mi) along U.S. Route 19, then 3.7 km (2.3 mi) west along the Pinellas
Bayway (State Route 693), then 2.3 km (1.45 mi) south along the Pinellas Bayway
across the Pinellas Bayway Bridge. The gage was at the south side of the bridge
at the seawall at the end of 1st Avenue East, and the bench marks are along the
Pinellas Bayway and 1st Avenue East near the south end of the bridge.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 6428 C 1976
DESIGNATION: 872 6428 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 12129
AGENCY: National Ocean Survey (NOS) PID#: AG7403
SETTING CLASSIFICATION: Copper-clad steel rod
The primary bench mark is a disk located 9 m (29 ft) east of the centerline of
the Pinellas Bayway southbound lane, 8.75 m (28.7 ft) WNW of the south end of
the first median south of the bridge over the main channel, and 8 m (27 ft)
south of the south end of the center island. The bench mark is set on top of a
copper-clad steel rod driven 12.2 m (40 ft) to refusal, and encased in a PVC
pipe with concrete kickblock.
BENCH MARK STAMPING: 6428 E 1976
DESIGNATION: 872 6428 E TIDAL
MONUMENTATION: Tidal Station disk VM#: 12130
AGENCY: National Ocean Survey (NOS) PID#: AG7404
SETTING CLASSIFICATION: Concrete pad
The bench mark is a disk set in the NE corner of the concrete pad for the Tierra
Verde Shopping Center, 41.0 m (134.5 ft) SW of bench mark 6428 C 1976, 21 m (68
ft) west of the centerline of the southbound lane of the Pinellas Bayway, 13.4 m
(44 ft) north of the centerline of the westbound lane of Madonna Boulevard, and
0.61 m (2.0 ft) above the road level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8726428 PUBLICATION DATE: 06/16/2004
Name: TIERRA VERDE
FLORIDA
NOAA Chart: 11414 Latitude: 27° 41.3' N
USGS Quad: PASS-A-GRILLE BEACH Longitude: 82° 43.1' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: N 17
DESIGNATION: N 17
MONUMENTATION: Survey disk VM#: 12131
AGENCY: Florida Highway Division (FLHD) PID#: AG5266
SETTING CLASSIFICATION: Concrete base
The bench mark is a disk set in the top of the concrete base for a metal
guardrail that borders the west edge of the walkway located on the east side of
a concrete highway drawbridge, 8 m (26 ft) north of the south end of the
concrete base, 1.34 m (4.4 ft) west of the east concrete guardrail on the
bridge, 0.15 m (0.5 ft) west of the metal guardrail, and 0.3 m (1 ft) above the
highway level.
BENCH MARK STAMPING: 6428 F 1990
DESIGNATION: 872 6428 F TIDAL
MONUMENTATION: Flange-encased Rod VM#: 12132
AGENCY: National Ocean Service (NOS) PID#: AG9423
SETTING CLASSIFICATION: Stainless steel rod
The bench mark is a flange-encased rod located at the Tierra Verde Marina, 30 m
(98 ft) NE of the NE corner of the dockmasters office, 5 m (16 ft) SW of a
wooden light pole, 1 m (2 ft) south of a black chain link fence, and 0.18 m (0.6
ft) SE of the carsonite witness post. The bench mark being the top of a
stainless steel rod driven 16.5 m (54 ft) to refusal encased in a NOS logo cap,
stamped 6428 F 1990, and attached to a PVC pipe surrounded by concrete flush
with the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8726428 PUBLICATION DATE: 06/16/2004
Name: TIERRA VERDE
FLORIDA
NOAA Chart: 11414 Latitude: 27° 41.3' N
USGS Quad: PASS-A-GRILLE BEACH Longitude: 82° 43.1' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6428 G 1990
DESIGNATION: 872 6428 G TIDAL
MONUMENTATION: Flange-encased Rod VM#: 12133
AGENCY: National Ocean Service (NOS) PID#: AG9425
SETTING CLASSIFICATION: Stainless steel rod
The bench mark is located 218 m (715 ft) south of 6428 E 1976, 17 m (55 ft) SW
of power pole 135335, 14 m (45 ft) west of the centerline of St. Road 693, 5 m
(15 ft) east of a seawall, and 4 m (12 ft) south of the carsonite witness post.
The bench mark is the top of a stainless steel rod driven 16 m (54 ft) to
refusal encased in a NOS logo cap, stamped 6428 G 1990, and attached to a PVC
pipe surrounded by concrete flush with the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8726428 PUBLICATION DATE: 06/16/2004
Name: TIERRA VERDE
FLORIDA
NOAA Chart: 11414 Latitude: 27° 41.3' N
USGS Quad: PASS-A-GRILLE BEACH Longitude: 82° 43.1' W
T I D A L D A T U M S
Tidal datums at TIERRA VERDE based on:
LENGTH OF SERIES: 5 MONTHS
TIME PERIOD: June 1990 - October 1990
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8726520 ST. PETERSBURG, TAMPA BAY
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER (MHHW) = 0.659
MEAN HIGH WATER (MHW) = 0.577
NORTH AMERICAN VERTICAL DATUM-1988 (NAVD) = 0.473
MEAN SEA LEVEL (MSL) = 0.347
MEAN TIDE LEVEL (MTL) = 0.340
MEAN LOW WATER (MLW) = 0.104
MEAN LOWER LOW WATER (MLLW) = 0.000
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
6428 C 1976 2.576 1.999
6428 E 1976 2.337 1.760
N 17 5.220 4.643
6428 F 1990 2.528 1.951
6428 G 1990 2.328 1.751
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8726428 PUBLICATION DATE: 06/16/2004
Name: TIERRA VERDE
FLORIDA
NOAA Chart: 11414 Latitude: 27° 41.3' N
USGS Quad: PASS-A-GRILLE BEACH Longitude: 82° 43.1' 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.