U.S. DEPARTMENT OF COMMERCE
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National Ocean Service
Datums Page Page 1 of 8
Station ID: 8726520 PUBLICATION DATE: 03/13/2018
Name: ST. PETERSBURG, TAMPA BAY
FL
NOAA Chart: 11413 Latitude: 27° 45.6' N ( 27.76060)
USGS Quad: PORT TAMPA Longitude: 82° 37.6' W ( -82.62690)
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 located on the end of the working pier directly in front of the
parking area.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 6520 K 1998
DESIGNATION: 872 6520 K
MONUMENTATION: Flange-encased Rod VM#: 13907
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID#: DL7633
LATITUDE: 27° 45.7' N ( 27.76089) LONGITUDE: 82° 37.5' W ( -82.62553)
The primary bench mark is a flange-encased rod located near the SE corner of the
US Coast Guard station near the runway for the Albert Witted Airport, 45.02 m
(147.70 ft) ENE of the NE corner of the pool house, 28.32 m (92.91 ft) SSE of
the SE corner of a parking lot, 7.62 m (25.00 ft) east of the eastermost edge of
the sidewalk, and 2.99 m (9.81 ft) west of the fence and a witness post. The
datum point is 9 cm (0.29 ft) below ground level, being the top of a stainless
steel rod driven 13.1 m (43.0 ft) to refusal, inside a sleeve to the depth of
0.9 m (2.95 ft) and encased in a 5-inch NOS logo cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 8
Station ID: 8726520 PUBLICATION DATE: 03/13/2018
Name: ST. PETERSBURG, TAMPA BAY
FL
NOAA Chart: 11413 Latitude: 27° 45.6' N ( 27.76060)
USGS Quad: PORT TAMPA Longitude: 82° 37.6' W ( -82.62690)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6520 D 1991
DESIGNATION: 872 6520 D
MONUMENTATION: Tidal Station disk VM#: 1423
AGENCY: National Ocean Service (NOS) IDB PID#: DM4512
SETTING CLASSIFICATION: Concrete sea wall OPUS PID:
LATITUDE: 27° 45.7' N ( 27.76086) LONGITUDE: 82° 37.6' W ( -82.62678)
The bench mark is a disk set in the top of the concrete sea wall along the
western side of the USCG base at the main USCG harbor, 60.35 m (198.00 ft) SSE
of the centerline of the boat ramp, 14.33 m (47.01 ft) NNW of the tide station
walkway, 5.79 m (19.00 ft) south of the NW corner of the tennis court retaining
wall, 1.31m (4.30 ft) SE of the center of the triangular metal communication
tower, 0.38 m (1.25 ft) NW of the SE corner of the concrete tower pad, and 0.15
m (0.49 ft) east of the west face of the main USCG building.
BENCH MARK STAMPING: 6520 G 1991
DESIGNATION: 872 6520 G
MONUMENTATION: Tidal Station disk VM#: 1426
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete bulkhead OPUS PID:
LATITUDE: 27° 45.7' N ( 27.76203) LONGITUDE: 82° 37.7' W ( -82.62867)
The bench mark is a disk set in the top of the concrete bulkhead just south of
the main guard shack, 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 (152.00 ft) south of the centerline
of the main road leading to base, and 5.52 m (18.11 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 8
Station ID: 8726520 PUBLICATION DATE: 03/13/2018
Name: ST. PETERSBURG, TAMPA BAY
FL
NOAA Chart: 11413 Latitude: 27° 45.6' N ( 27.76060)
USGS Quad: PORT TAMPA Longitude: 82° 37.6' W ( -82.62690)
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: US Army Corps of Engineers (USE) IDB PID#: AG5298
SETTING CLASSIFICATION: Concrete sea wall OPUS PID:
LATITUDE: 27° 45.7' N ( 27.76197) LONGITUDE: 82° 38.0' W ( -82.63306)
The bench mark is a disk set in 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 (3.61 ft) east of the west end of the sea wall, 0.34 m (1.12 ft) north of
the north end of the north-south sea wall, and about 0.3 m (0.98 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) IDB PID#: DM4514
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 27° 45.7' N ( 27.76242) LONGITUDE: 82° 37.9' W ( -82.63186)
The bench mark is a disk located along 8th Avenue SE across from the city of St.
Petersburg cruise Port Terminal, 35.36 m (116.010 ft) NNE of the flag pole at
the entrance of the terminal, 10.21 m (33.50 ft) north of the centerline of the
8th Avenue, 2.44 m (8.01 ft) south of a chainlink fence, and 2.13 m (6.99 ft) NE
of power pole (1A-58879. The bench mark is level with the ground, crimped to a
stainless steel rod driven 14.6 m (47.9 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 8
Station ID: 8726520 PUBLICATION DATE: 03/13/2018
Name: ST. PETERSBURG, TAMPA BAY
FL
NOAA Chart: 11413 Latitude: 27° 45.6' N ( 27.76060)
USGS Quad: PORT TAMPA Longitude: 82° 37.6' W ( -82.62690)
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) IDB PID#: DM4510
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID:
LATITUDE: 27° 45.7' N ( 27.76144) LONGITUDE: 82° 37.5' W ( -82.62553)
The bench mark is a flange-encased rod located 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 (131.59 ft) east of the SE corner of the
Mess/Recreation Hall, 33.71 m (110.60 ft) north of the southern-most corner of
the parking lot, and 3.20 m (10.50 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 (35.8 ft) to refusal, inside a sleeve to a depth of 0.9 m (3.0 ft)
and encased in a 5-inch NOS logo cap. Note: the sleeve depth does not meet the
specifications for a Class A rod mark.
BENCH MARK STAMPING: 6520 L 2001
DESIGNATION: 872 6520 L
MONUMENTATION: Tidal Station disk VM#: 16514
AGENCY: National Ocean Service (NOS) IDB PID#: DM4511
SETTING CLASSIFICATION: Sea wall OPUS PID:
LATITUDE: 27° 45.6' N ( 27.76019) LONGITUDE: 82° 37.6' W ( -82.62644)
The bench mark is a disk set in the southern corner of the concrete sea wall
along the Coast Guard basin , 38.20 m (125.33 ft) SSW of the SW corner of
building U-14, 30.40 m (99.74 ft) west of the west face of the Wind Jammer
Building, and 0.40 m (1.31 ft) east of the east face of the bulkhead.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 8
Station ID: 8726520 PUBLICATION DATE: 03/13/2018
Name: ST. PETERSBURG, TAMPA BAY
FL
NOAA Chart: 11413 Latitude: 27° 45.6' N ( 27.76060)
USGS Quad: PORT TAMPA Longitude: 82° 37.6' W ( -82.62690)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: RLS 2512
DESIGNATION: 872 6520 RLS 2512
MONUMENTATION: Survey disk VM#: 17600
AGENCY: Unknown IDB PID#: DM4513
SETTING CLASSIFICATION: Concrete bulkhead OPUS PID:
LATITUDE: 27° 45.7' N ( 27.76106) LONGITUDE: 82° 37.6' W ( -82.62689)
The bench mark is a disk set in the top of the concrete sidewalk on the west
side of the USCG Base at the USCG Harbor, 6.35 m (20.83 ft) SW from the most SW
ballard at Coast Guard North Mooring Pier, 6.19 m (20.31 ft) north of the
northern most track of the marine travel lift, 2.75 m (9.02 ft) SW of the SE
corner of the Coast Guard's North Mooring Pier, 1.25 m (4.10 ft) east of the
west face of the basin retaining wall, and 1.06 m (3.48 ft) south of the foot of
the steps on the SE corner of the Coast Guard's North Mooring Pier. THE
BENCH MARK IS SET FLUSH IN THE TOP OF THE CONCRETE SIDEWALK ON THE WEST SIDE OF
THE USCG BASE AT THE USCG HARBOR, 6.35 M (20.83 FT) SW FROM THE MOST SW BALLARD
AT THE COAST GUARDS NORTH MOORING PIER, 6.19 M (20.31 FT) NORTH FROM THE NORTERN
MOST TRACK OF THE MARINE TRAVEL LIFT, 2.75 M (9.02 FT) SW FROM THE SE CORNER OF
THE COAST GUARDS NORTH MOORING PIER, 1.254 M (4.114 FT) EAST FROM THE WEST FACE
OF THE BASIN RETAINING WALL, 1.062 M (3.484 FT) SOUTH FROM THE FOOT OF THE STEPS
ON THE SE CORNER OF THE COAST GUARDS NORTH MOORING.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 8
Station ID: 8726520 PUBLICATION DATE: 03/13/2018
Name: ST. PETERSBURG, TAMPA BAY
FL
NOAA Chart: 11413 Latitude: 27° 45.6' N ( 27.76060)
USGS Quad: PORT TAMPA Longitude: 82° 37.6' W ( -82.62690)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: ST PETE-1 1985
DESIGNATION: 872 6520 ST PETE-1
MONUMENTATION: Survey disk VM#: 18156
AGENCY: US Army Corps of Engineers (USE) IDB PID#: DM4515
SETTING CLASSIFICATION: Concrete sea wall OPUS PID:
LATITUDE: 27° 45.7' N ( 27.76200) LONGITUDE: 82° 38.0' W ( -82.63292)
The bench mark is a disk set flush in the top of a concrete sea wall 9.0 m (29.5
ft) ENE from the centerline of Peninsula Drive East, set in the NW corner of two
intersecting sea walls, 2.30 m (7.55 ft) west of the NE face of the sea wall,
and 1.35 m (4.43 ft) south of a green chainlink fence around the cruise ship
fascility.
BENCH MARK STAMPING: ST PETE-2 1925
DESIGNATION: 872 6520 ST PETE-2
MONUMENTATION: Survey disk VM#: 18157
AGENCY: US Army Corps of Engineers (USE) IDB PID#: DM4516
SETTING CLASSIFICATION: Concrete sea wall OPUS PID#: DM4516
LATITUDE: 27° 45.6' N ( 27.75983) LONGITUDE: 82° 37.9' W ( -82.63125)
The bench mark is a disk set flush in the top of a concrete sea wall, 8.13 m
(26.67 ft) SE of the SW corner of the foundation of the Radar Doppler Building.
7.5 m (24.6 ft) south from the SE corner of the Radar Doppler Building, and 0.85
m (2.79 ft) NW of the SE face of the University of Florida sea wall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 8
Station ID: 8726520 PUBLICATION DATE: 03/13/2018
Name: ST. PETERSBURG, TAMPA BAY
FL
NOAA Chart: 11413 Latitude: 27° 45.6' N ( 27.76060)
USGS Quad: PORT TAMPA Longitude: 82° 37.6' W ( -82.62690)
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 1983 - December 2001
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION:
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (08/31/1985) = 1.907
MEAN HIGHER HIGH WATER MHHW = 0.688
MEAN HIGH WATER MHW = 0.602
North American Vertical Datum NAVD88 = 0.450
MEAN SEA LEVEL MSL = 0.366
MEAN TIDE LEVEL MTL = 0.360
MEAN LOW WATER MLW = 0.117
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (09/11/2017) = -1.080
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
6520 K 1998 2.034 1.432
6520 D 1991 1.822 1.220
6520 G 1991 2.780 2.178
EDD 60 1935 MSL 8.242 2.737 2.135
6520 H 1993 2.394 1.792
6520 J 1997 1.752 1.150
6520 L 2001 1.783 1.181
RLS 2512 1.807 1.205
ST PETE-1 1985 2.063 1.461
ST PETE-2 1925 2.051 1.449
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 8 of 8
Station ID: 8726520 PUBLICATION DATE: 03/13/2018
Name: ST. PETERSBURG, TAMPA BAY
FL
NOAA Chart: 11413 Latitude: 27° 45.6' N ( 27.76060)
USGS Quad: PORT TAMPA Longitude: 82° 37.6' W ( -82.62690)
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.