U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 4
PUBLICATION DATE: 01/19/1984
Station ID: 8726367 SUPERCEDED DATE: 04/21/2003
Name: MULLET KEY, BAYOU INSIDE
FLORIDA
NOAA Chart: 11414 Latitude: 27° 37.3' N
USGS Quad: ANNA MARIA Longitude: 82° 43.6' W
To reach the tidal bench marks from the St. Petersburg Post Office at the
intersection of First Avenue North and Fourth Street travel 2.5 miles (4 km)
west along First Avenue to U.S. Highway 19 (34th Street), 3.6 miles (5.8 km)
south along U.S. Highway 19, 2.3 miles (3.7 km) west along Pinellas Bayway, 6.6
miles (10.6 km) south on Pinellas Bayway to a paved road, 0.75 mile (1.2 km) SW
on paved road to Old Fort DeSoto, and 0.15 mile (0.2 km) on the paved road to a
parking lot, picnic area and fishing pier. The tide gage was located on shore
and staff on a piling in Bayou 0.9 mile (1.4 km) west of main office for Fort
DeSoto.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 6364 A 1976
MONUMENTATION: Survey Disk VM#: 12106
AGENCY: PID#: AG0290
SETTING CLASSIFICATION: Concrete Culvert
The bench mark is located between Pier 1 and Pier 2 set in top of concrete
culvert, 231 feet (70.4 m) north of shore line, 225 feet (68.6 m) south of
Anderson Boulevard, 29.0 feet (8.8 m) east of centerline of an asphalt road and
10.2 feet (3.1 m) NW of SE end of culvert.
BENCH MARK STAMPING: 6367 C 1976
MONUMENTATION: Survey Disk VM#: 12107
AGENCY: PID#: AG7401
SETTING CLASSIFICATION: Concrete Culvert
The bench mark is located at the entrance road to the Fort DeSoto Park and
fishing pier, set in top of a concrete culvert on the right side of the road,
89.5 feet (27.3 m) south of the junction park entrance road, 87.0 feet (26.5 m)
east of fire hydrant, 67.0 feet (20.4 m) north of north edge of parking area and
25.0 feet (7.6 m) west of centerline of entrance road to park.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 4
PUBLICATION DATE: 01/19/1984
Station ID: 8726367 SUPERCEDED DATE: 04/21/2003
Name: MULLET KEY, BAYOU INSIDE
FLORIDA
NOAA Chart: 11414 Latitude: 27° 37.3' N
USGS Quad: ANNA MARIA Longitude: 82° 43.6' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6367 E 1976
MONUMENTATION: Survey Disk VM#: 12108
AGENCY: PID#: AG7402
SETTING CLASSIFICATION: Rod Mark
The bench mark is located at the Fort DeSoto Park area shelter 1, 0.2 mile (0.3
km) north along a dirt road leading to bay, 120.0 feet (36.6 m) south of
shoreline, 41.0 feet (12.5 m) east of centerline of dirt road, 8.0 feet (2.4 m)
SW of white mangove tree at the edge of tree line and 0.4 feet (0.1 m) west of
metal witness post. The bench mark is on a rod protected by a PVC pipe
projecting 0.8 feet (0.2 m) above ground.
BENCH MARK STAMPING: TH 60 RESET 1974
MONUMENTATION: Survey Disk VM#: 12109
AGENCY: PID#: AG7400
SETTING CLASSIFICATION: Concrete
The bench mark is located at Fort DeSoto Park area 1 and fishing pier, set in
top of a 6 x 10 feet (1.8 m x 3.0 m) concrete underground utilities, 300 feet
(91.4 m) NW of Bench Mark TH 61 1967 Jacksonville, Florida, 112.0 feet (34.1 m)
north of seawall, 21.0 feet (6.4 m) NW of minature railroad and 4.0 feet (1.2 m)
north of power pole.
BENCH MARK STAMPING: TH 61 1967 JACKSONVILLE FL
MONUMENTATION: Survey Disk VM#: 12110
AGENCY: PID#: AG5198
SETTING CLASSIFICATION: Concrete
The bench mark is 18.7 feet (5.7 m) SE of the NW end of the concrete fishing
pier, 6.1 feet (1.9 m) SW of the NE edge of the pier and 6.0 feet (1.8 m) NE of
the SW edge of the pier.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 4
PUBLICATION DATE: 01/19/1984
Station ID: 8726367 SUPERCEDED DATE: 04/21/2003
Name: MULLET KEY, BAYOU INSIDE
FLORIDA
NOAA Chart: 11414 Latitude: 27° 37.3' N
USGS Quad: ANNA MARIA Longitude: 82° 43.6' W
T I D A L D A T U M S
Tidal datums at MULLET KEY, BAYOU INSIDE based on:
LENGTH OF SERIES: 3 MONTHS
TIME PERIOD: AUGUST-OCTOBER 1976
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8726454 POINT PINELLAS, FL
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (10/26/1976) = 3.25
MEAN HIGHER HIGH WATER MHHW = 2.19
MEAN HIGH WATER MHW = 1.98
MEAN TIDE LEVEL MTL = 1.13
MEAN LOW WATER MLW = 0.28
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (10/23/1976) = -0.75
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
6364 A 1976 4.82 2.84
6367 C 1976 5.37 3.39
6367 E 1976 2.46 0.48
TH 60 RESET 1974 6.82 4.84
TH 61 1967 JACKSONVILLE FL 10.70 8.72
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 4
PUBLICATION DATE: 01/19/1984
Station ID: 8726367 SUPERCEDED DATE: 04/21/2003
Name: MULLET KEY, BAYOU INSIDE
FLORIDA
NOAA Chart: 11414 Latitude: 27° 37.3' N
USGS Quad: ANNA MARIA Longitude: 82° 43.6' 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 (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 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.