U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 4
Station ID: 8726083 PUBLICATION DATE: 09/26/2003
Name: SARASOTA, SARASOTA BAY
FL
NOAA Chart: 11424 Latitude: 27° 19.9' N ( 27.33170)
USGS Quad: SARASOTA Longitude: 82° 32.7' W ( -82.54500)
To reach the tidal bench marks in Sarasota, proceed west on U.S. Highway 41 to
Sarasota Island Park. The bench marks are located in the park area. The tide
gage and staff were located on the park pier.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 6083 A 1977
DESIGNATION: 872 6083 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 6122
AGENCY: National Ocean Survey (NOS) IDB PID#: AG7714
SETTING CLASSIFICATION: Concrete sea wall OPUS PID:
LATITUDE: 27° 19.9' N ( 27.33170) LONGITUDE: 82° 32.7' W ( -82.54500)
The primary bench mark is a disk set flush in the north concrete sea wall of
Sarasota Island Park, 12.74 m (41.8 ft) east of a lamp post, 2.80 m (9.2 ft)
north of the north walkway, and 0.30 m (1.0 ft) south of the north edge of the
seawall water line.
BENCH MARK STAMPING: 6083 B 1977
DESIGNATION: 872 6083 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 6123
AGENCY: National Ocean Survey (NOS) IDB PID#: AG7713
SETTING CLASSIFICATION: Concrete sea wall OPUS PID#: AG7713
LATITUDE: 27° 19.9' N ( 27.33170) LONGITUDE: 82° 32.7' W ( -82.54500)
The bench mark is a disk set flush in the north concrete sea wall, 73 m (240 ft)
east of Bench Mark 6083 A 1977, 16 m (51 ft) SW of the east corner of the boat
basin, 6 m (21 ft) west of a lamp post, and 0.30 m (1.0 ft) SW of the north edge
of the seawall water line.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 4
Station ID: 8726083 PUBLICATION DATE: 09/26/2003
Name: SARASOTA, SARASOTA BAY
FL
NOAA Chart: 11424 Latitude: 27° 19.9' N ( 27.33170)
USGS Quad: SARASOTA Longitude: 82° 32.7' W ( -82.54500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6083 C 1977
DESIGNATION: 872 6083 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 6124
AGENCY: National Ocean Survey (NOS) IDB PID#: AG7712
SETTING CLASSIFICATION: Concrete sea wall OPUS PID:
LATITUDE: 27° 19.9' N ( 27.33170) LONGITUDE: 82° 32.7' W ( -82.54500)
The bench mark is a disk set flush in the south concrete sea wall, 39 m (128 ft)
north of the NE corner of a snack bar, 31.82 m (104.4 ft) SE of Bench Mark 6083
B 1977, 18.75 m (61.5 ft) SW of the NE end of the seawall, and 10 m (32 ft) SE
of the walkway median.
BENCH MARK STAMPING: 6083 G 1982
DESIGNATION: 872 6083 G TIDAL
MONUMENTATION: Tidal Station disk VM#: 6126
AGENCY: National Ocean Survey (NOS) IDB PID#: AG7710
SETTING CLASSIFICATION: Concrete base for war memorial OPUS PID:
LATITUDE: 27° 20.1' N ( 27.33500) LONGITUDE: 82° 32.7' W ( -82.54500)
The bench mark is a disk set in the concrete base for a war memorial across U.S.
Highway 41 from the park and Marina Jacks Restaurant, 31.49 m (103.3 ft) NNE of
the centerline of the northbound highway, 23.04 m (75.6 ft) SW of the centerline
of Gulfstream Avenue, and 5.30 m (17.4 ft) north of the NE corner of a tiered
platform. NOTE: Mark was not found by US Power Squadron in 2002, mark under
pavement.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 4
Station ID: 8726083 PUBLICATION DATE: 09/26/2003
Name: SARASOTA, SARASOTA BAY
FL
NOAA Chart: 11424 Latitude: 27° 19.9' N ( 27.33170)
USGS Quad: SARASOTA Longitude: 82° 32.7' W ( -82.54500)
T I D A L D A T U M S
Tidal datums at SARASOTA, SARASOTA BAY based on:
LENGTH OF SERIES: 2 MONTHS
TIME PERIOD: June 1977 - July 1977
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8725943 BLACKBURN POINT
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.595
MEAN HIGH WATER MHW = 0.522
North American Vertical Datum NAVD88 = 0.475
MEAN TIDE LEVEL MTL = 0.332
MEAN SEA LEVEL MSL = 0.325
MEAN LOW WATER MLW = 0.142
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
6083 A 1977 1.137 0.615
6083 B 1977 1.127 0.605
6083 C 1977 1.187 0.665
6083 G 1982 2.420 1.898
Foot Notes:
Bench mark 6083 G 1982 is based on one differential leveling connection and does
not meet the quality control standards of the NOS. Therefore, caution should be
used when deriving elevations for this mark.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 4
Station ID: 8726083 PUBLICATION DATE: 09/26/2003
Name: SARASOTA, SARASOTA BAY
FL
NOAA Chart: 11424 Latitude: 27° 19.9' N ( 27.33170)
USGS Quad: SARASOTA Longitude: 82° 32.7' W ( -82.54500)
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.