U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
PUBLICATION DATE: 05/23/2000
Station ID: 8726520 SUPERCEDED DATE: 04/21/2003
Name: ST. PETERSBURG, TAMPA BAY
FLORIDA
NOAA Chart: 11413 Latitude: 27° 45.6' N
USGS Quad: PORT TAMPA Longitude: 82° 37.6' W
To reach the tidal bench marks from the foot of the Municipal Pier in St.
Petersburg, proceed south on 2nd Street for 1.3 km (0.8 mi) to the dead end
intersection with 8th Avenue SE. Then go east on 8th Avenue SE for 0.5 km (0.3
mi) to the U.S. Coast Guard Station St. Petersburg entrance gate. Continue
ahead to the end of the road which terminates at the boat launch ramp. The
bench marks are located in the vicinity of the Coast Guard Station. The tide
station is on an elevated platform at the end of a 18 m (60 ft) walkway, about
76 m (250 ft) south of the boat launch ramp.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 6520 F 1991
DESIGNATION: 872 6520 F
MONUMENTATION: Tidal Station disk VM#: 1425
AGENCY: National Ocean Service (NOS) PID:
SETTING CLASSIFICATION: Concrete support pad
The primary bench mark is a disk set flush in the top of the concrete support
pad for a triangular metal communication tower located at the east end of the
main USCG building, 30.45 M (99.0 ft) south of the centerline of the main base
road, 17.22 m (56.5 ft) north of the change in seawall direction at the head of
the stairs, 8.23 m (27.0 ft) SE of the centerline of the east entrance hallway
to the main USCG Building, 1.31 m (4.3 ft) SE of the center of the triangular
metal communication tower, and 0.38 m (1.2 ft) NW of the SE corner of the
concrete tower pad.
BENCH MARK STAMPING: 6520 D 1991
DESIGNATION: 872 6520 D
MONUMENTATION: Tidal Station disk VM#: 1423
AGENCY: National Ocean Service (NOS) PID:
SETTING CLASSIFICATION: Concrete sea wall
The bench mark is a disk set flush in the top of the concrete sea wall along the
western side of the USCG base at the main USCG harbor, 60.35 m (198.0 ft) SSE of
the centerline of the boat ramp, 14.33 m (47.0 ft) NNW of the tide station
walkway, 5.79 m (19.0 ft) south of the NW corner of the tennis court retaining
wall, and 0.15 m (0.5 ft) east of the west face of the sea wall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
PUBLICATION DATE: 05/23/2000
Station ID: 8726520 SUPERCEDED DATE: 04/21/2003
Name: ST. PETERSBURG, TAMPA BAY
FLORIDA
NOAA Chart: 11413 Latitude: 27° 45.6' N
USGS Quad: PORT TAMPA Longitude: 82° 37.6' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6520 E 1991
DESIGNATION: 872 6520 E
MONUMENTATION: Tidal Station disk VM#: 1424
AGENCY: National Ocean Service (NOS) PID:
SETTING CLASSIFICATION: Concrete retaining wall
The bench mark is a disk set flush in the top of the northern concrete retaining
wall of the boat launch ramp, 85.6 m (280.8 ft) SSE of a change in direction of
the sea wall at the head of the stairs, 15.5 m (50.9 ft) SW of the center of a
triangular metal radar tower, 9.85 m (32.3 ft) NNW of the centerline of the boat
ramp, 0.76 m (2.5 ft) NNW of the south face of the boat ramp retaining wall, and
0.15 m (0.5 ft) east of the west face of the sea wall.
BENCH MARK STAMPING: 6520 G 1991
DESIGNATION: 872 6520 G
MONUMENTATION: Tidal Station disk VM#: 1426
AGENCY: National Ocean Service (NOS) PID:
SETTING CLASSIFICATION: Concrete bulkhead
The bench mark is a disk set flush in the top of the concrete bulkhead just
south of the main guard shack at the entrance to the Coast Guard base, 126.5 m
(415.0 ft) west of the change in direction of the sea wall at the head of the
stairs, 46.33 m (152.0 ft) south of the centerline of the main road leading to
base, and 5.52 m (18.1 ft) north of the south face of the east-west sea wall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
PUBLICATION DATE: 05/23/2000
Station ID: 8726520 SUPERCEDED DATE: 04/21/2003
Name: ST. PETERSBURG, TAMPA BAY
FLORIDA
NOAA Chart: 11413 Latitude: 27° 45.6' N
USGS Quad: PORT TAMPA Longitude: 82° 37.6' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: EDD 60 1935 MSL 8.242
DESIGNATION: EDD 60 USE
MONUMENTATION: Survey disk VM#: 1427
AGENCY: United States Army Corps of Engineers
(USACE) PID#: AG5298
SETTING CLASSIFICATION: Concrete sea wall
The bench mark is a disk set in the top near the NE corner of a concrete sea
wall, near the NE corner of the housing area of the University of South Florida
Bay Campus, 1.10 m (3.6 ft) east of the west end of the sea wall, 0.34 m (1.1
ft) north of the north end of the north-south sea wall, and about 0.3 m (1 ft)
above the parking area.
BENCH MARK STAMPING: 6520 H 1993
DESIGNATION: 872 6520 H
MONUMENTATION: Tidal Station disk VM#: 12553
AGENCY: National Ocean Service (NOS) PID:
SETTING CLASSIFICATION: Stainless steel rod
The bench mark is a disk set along 8th Avenue SE across from the City of St.
Petersburg Cruise Port Terminal, 35.36 m (116.0 ft) NNE of the flagpole at the
entrance of the terminal, 10.21 m (33.5 ft) north of the centerline of the 8th
Avenue, 2.13 m (7.0 ft) NE of power pole 1A-58879, and 2.44 m (8.0 ft) south of
a chainlink fence. The bench mark is level with the ground, crimped to a
stainless steel rod driven 14.6 m (48 ft) to refusal, and encased in a 5-inch
PVC pipe with concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
PUBLICATION DATE: 05/23/2000
Station ID: 8726520 SUPERCEDED DATE: 04/21/2003
Name: ST. PETERSBURG, TAMPA BAY
FLORIDA
NOAA Chart: 11413 Latitude: 27° 45.6' N
USGS Quad: PORT TAMPA Longitude: 82° 37.6' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6520 J 1997
DESIGNATION: 872 6520 J
MONUMENTATION: Flange-encased Rod VM#: 13775
AGENCY: National Ocean Service (NOS) PID:
SETTING CLASSIFICATION: Stainless steel rod in sleeve
The bench mark is a flange-encased rod set in a grass field between the Coast
Guard parking area and the airport Tar-Mac, on the eastern-most side of the
Coast Guard Base, 40.11 m (131.6 ft) east of the SE corner of the
Mess/Recreation Hall, 33.71 m (110.6 ft) north of the southern-most corner of
the parking lot, and 3.20 m (10.5 ft) west of the fence that runs along the
eastern-most property line. The datum point is the top of a stainless steel rod
driven 10.9 m (36 ft) to refusal, encased inside a 0.9 m (3 ft) sleeve and
5-inch NOS logo cap.
BENCH MARK STAMPING: 6520 K 1998
DESIGNATION: 872 6520 K
MONUMENTATION: Flange-encased Rod VM#: 13907
AGENCY: National Ocean Service (NOS) PID:
SETTING CLASSIFICATION: Stainless steel rod in sleeve
The bench mark is a metal rod set near the SE corner of the US Coast Guard
station near the runway for the Albert Witted Airport, 45.02 m (147.7 ft) ENE of
the NE corner of the pool house, 28.32 m (92.9 ft) SSE of the SE corner of a
parking lot, 7.62 m (25.0 ft) east of the easternmost edge of the sidewalk, and
2.99 m (9.8 ft) west of the fence and a witness post. The datum point is 9 cm
(0.3 ft) below ground level, being the top of a stainless steel rod driven 13.1
m (43 ft) to refusal, and encased in a 0.9 m (3 ft) sleeve and 5-inch NOS logo
cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
PUBLICATION DATE: 05/23/2000
Station ID: 8726520 SUPERCEDED DATE: 04/21/2003
Name: ST. PETERSBURG, TAMPA BAY
FLORIDA
NOAA Chart: 11413 Latitude: 27° 45.6' N
USGS Quad: PORT TAMPA Longitude: 82° 37.6' W
T I D A L D A T U M S
Tidal datums at ST. PETERSBURG, TAMPA BAY based on:
LENGTH OF SERIES: 19 YEARS
TIME PERIOD: January 1961 - December 1979
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION:
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (08/31/1985) = 1.969
MEAN HIGHER HIGH WATER MHHW = 0.683
MEAN HIGH WATER MHW = 0.597
North American Vertical Datum NAVD88 = 0.504
MEAN SEA LEVEL MSL = 0.363
MEAN TIDE LEVEL MTL = 0.357
MEAN LOW WATER MLW = 0.119
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (09/08/1965) = -0.692
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
6520 F 1991 3.057 2.459
6520 D 1991 1.884 1.287
6520 E 1991 1.872 1.274
6520 G 1991 2.840 2.243
EDD 60 1935 MSL 8.242 2.798 2.201
6520 H 1993 2.456 1.859
6520 J 1997 1.813 1.216
6520 K 1998 2.095 1.498
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
PUBLICATION DATE: 05/23/2000
Station ID: 8726520 SUPERCEDED DATE: 04/21/2003
Name: ST. PETERSBURG, TAMPA BAY
FLORIDA
NOAA Chart: 11413 Latitude: 27° 45.6' N
USGS Quad: PORT TAMPA Longitude: 82° 37.6' 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.