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National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 7
Station ID: 8725769 PUBLICATION DATE: 04/24/2012
Name: EL JOBEAN, MYAKKA RIVER
FL
NOAA Chart: 11426 Latitude: 26° 57.7' N ( 26.96170)
USGS Quad: EL JOBEAN Longitude: 82° 12.6' W ( -82.21000)
To reach the tidal bench marks in El Jobean from the intersection of U.S. Route
41 (Tamiami Trail) and State Route 776 (El Jobean Road), proceed SW on State
Route 776 to the bridge over Myakka River. The bench marks are along the bridge
and State Route 776. The tide station was located under the south end of the
old railroad bridge (now destroyed).
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 5769 A 1977
DESIGNATION: 872 5769 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 6054
AGENCY: National Ocean Survey (NOS) IDB PID#: AG7765
SETTING CLASSIFICATION: Concrete sea wall OPUS PID:
LATITUDE: 26° 57.7' N ( 26.96170) LONGITUDE: 82° 12.8' W ( -82.21330)
The primary bench mark is a disk set in the top of the concrete sea wall located
at north end of bridge over the Myakka River, 45.11 m (148.0 ft) north of bench
mark 5769 B 1977, 12.80 m (42.0 ft) east of centerline of State Road 776, and
0.46 m (1.5 ft) south of north end of the sea wall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 7
Station ID: 8725769 PUBLICATION DATE: 04/24/2012
Name: EL JOBEAN, MYAKKA RIVER
FL
NOAA Chart: 11426 Latitude: 26° 57.7' N ( 26.96170)
USGS Quad: EL JOBEAN Longitude: 82° 12.6' W ( -82.21000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5769 B 1977
DESIGNATION: 872 5769 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 6055
AGENCY: National Ocean Survey (NOS) IDB PID#: AG7766
SETTING CLASSIFICATION: Concrete sea wall OPUS PID:
LATITUDE: 26° 57.7' N ( 26.96170) LONGITUDE: 82° 12.8' W ( -82.21330)
The bench mark is a disk set in top of the concrete sea wall located at the
north end of the bridge over the Myakka River, 58.52 m (192.0 ft) north of bench
mark 5769 C 1977, 45.11 m (148.0 ft) south of bench mark 5769 A 1977, 12.80 m
(42.0 ft) east of centerline of State Road 776, and 0.30 m (1.0 ft) west of east
edge of the sea wall.
BENCH MARK STAMPING: 5769 C 1977
DESIGNATION: 872 5769 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 6056
AGENCY: National Ocean Survey (NOS) IDB PID#: AG7767
SETTING CLASSIFICATION: Concrete sea wall OPUS PID:
LATITUDE: 26° 57.7' N ( 26.96170) LONGITUDE: 82° 12.8' W ( -82.21330)
The bench mark is a disk set in top of the concrete sea wall located at the
north end of the bridge over the Myakka River, 58.52 m (192.0 ft) south of bench
mark 5769 B 1977, 53.34 (175.0 ft) NE of bench mark 5769 D, 13.11 m (43.0 ft)
east of the centerline of State Road 776, 6.10 m (20.0 ft) east of east curb of
State Road 776, and 0.30 m (1.0 ft) west of east edge of the sea wall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 7
Station ID: 8725769 PUBLICATION DATE: 04/24/2012
Name: EL JOBEAN, MYAKKA RIVER
FL
NOAA Chart: 11426 Latitude: 26° 57.7' N ( 26.96170)
USGS Quad: EL JOBEAN Longitude: 82° 12.6' W ( -82.21000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5769 D
DESIGNATION: 872 5769 D TIDAL
ALIAS: SRD
MONUMENTATION: Survey disk VM#: 6057
AGENCY: Florida Department of Transportation
(FLDT) IDB PID#: AG7769
SETTING CLASSIFICATION: Concrete bridge rail OPUS PID:
LATITUDE: 26° 57.7' N ( 26.96170) LONGITUDE: 82° 12.8' W ( -82.21330)
The bench mark is a disk set in the top of the concrete bridge rail at the NW
corner of the bridge over the Myakka River, 53.34 m (175.0 ft) southwest of
bench mark 5769 C 1977, 5.79 m (19.0 ft) west of the centerline of State Road
776, and 1.22 m (4.0 ft) west of the west curb and walkway on the bridge. NOTE:
The mark was originally unstamped.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 7
Station ID: 8725769 PUBLICATION DATE: 04/24/2012
Name: EL JOBEAN, MYAKKA RIVER
FL
NOAA Chart: 11426 Latitude: 26° 57.7' N ( 26.96170)
USGS Quad: EL JOBEAN Longitude: 82° 12.6' W ( -82.21000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: D 636 2005
DESIGNATION: D 636
MONUMENTATION: Flange-encased Rod VM#: 19994
AGENCY: US Coast & Geodetic Survey
(USC&GS) IDB PID#: DJ3463
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 26° 58.3' N ( 26.97222) LONGITUDE: 82° 12.5' W ( -82.20917)
The bench mark is a flange encased rod located 9.45 m (31.0 ft) WNW of the
approximate centerline of State Road 776 northbound lanes, 11.70 m (38.4 ft) ESE
of the approximate center of State Road 776 southbound lanes, 1.04 m (3.4 ft)
south of the approximate extended centerline of Nettle Road, and 0.43 m (1.4 ft)
west of a carsonite witness post. The bench mark is a stainless steel rod
driven to refusal at a depth of 9.63 m (31.6 ft) with an NGS logo cap flush with
the ground and about 0.15 m (0.5 ft) above the level of State Road 776, and the
datum point is recessed 0.12 m (0.4 ft) below the level of the NGS logo cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 7
Station ID: 8725769 PUBLICATION DATE: 04/24/2012
Name: EL JOBEAN, MYAKKA RIVER
FL
NOAA Chart: 11426 Latitude: 26° 57.7' N ( 26.96170)
USGS Quad: EL JOBEAN Longitude: 82° 12.6' W ( -82.21000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: E 636 2005
DESIGNATION: E 636
MONUMENTATION: Survey disk VM#: 19995
AGENCY: Florida Dept. of Environmental
Protection (FLDEP) IDB PID#: DJ3464
SETTING CLASSIFICATION: Round concrete monument OPUS PID:
LATITUDE: 26° 59.1' N ( 26.98444) LONGITUDE: 82° 12.4' W ( -82.20639)
The bench mark is a disk set flush in the top of a round concrete monument flush
with the ground and about 9.15 m (0.5 ft) above the level of State Road 776,
15.36 m (50.4 ft) WNW of the approximate centerline of State Road 776 northbound
lanes, 8.53 m (28.0 ft) north of the approximate extended centerline of the
median on River Wood Drive, 6.30 m (20.7 ft) ESE of the approximate centerline
of State Road 776 southbound lanes, and 0.30 m (1.0 ft) NNE of a carsonite
witness post.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 7
Station ID: 8725769 PUBLICATION DATE: 04/24/2012
Name: EL JOBEAN, MYAKKA RIVER
FL
NOAA Chart: 11426 Latitude: 26° 57.7' N ( 26.96170)
USGS Quad: EL JOBEAN Longitude: 82° 12.6' W ( -82.21000)
T I D A L D A T U M S
Tidal datums at EL JOBEAN, MYAKKA RIVER based on:
LENGTH OF SERIES: 5 MONTHS
TIME PERIOD: August 1977 - December 1977
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8725744 PUNTA GORDA
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.609
MEAN HIGH WATER MHW = 0.530
North American Vertical Datum NAVD88 = 0.491
MEAN SEA LEVEL MSL = 0.332
MEAN TIDE LEVEL MTL = 0.332
MEAN LOW WATER MLW = 0.134
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
5769 A 1977 1.377 0.847
5769 B 1977 1.389 0.859
5769 C 1977 1.377 0.847
5769 D 5.803 5.273
D 636 2005 2.681 2.151
E 636 2005 3.411 2.881
Foot Notes:
Geodetic heights of the bench marks meet all NOAA/NOS/NGS quality control
standards for Second Order, Class 1 leveling. It is advised that a confirmation
set of levels be established for bench marks D 636 2005 and E 636 2005 to verify
height differences before using tidal bench mark elevation information.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 7
Station ID: 8725769 PUBLICATION DATE: 04/24/2012
Name: EL JOBEAN, MYAKKA RIVER
FL
NOAA Chart: 11426 Latitude: 26° 57.7' N ( 26.96170)
USGS Quad: EL JOBEAN Longitude: 82° 12.6' W ( -82.21000)
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.