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Bench Mark Sheet for 8720296, ORTEGA RIVER ENTRANCE FL

Superseded Epoch

Large map location marker Station Location
Small red map location marker Published bench mark
Small blue map location marker Unpublished bench mark

Bench mark positions only appear on the map if their coordinates in the CO-OPS database are at the precision of degrees/minutes/seconds/and tenths of seconds. If the coordinates are less precise, the mark will not appear.

Printable version

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  7

                                                                                
Station ID: 8720296                         PUBLICATION DATE:  11/10/2010
Name:       ORTEGA RIVER ENTRANCE                             
            FL
NOAA Chart: 11492                           Latitude:   30° 16.7' N (  30.27830)
USGS Quad:  JACKSONVILLE                    Longitude:  81° 42.3' W ( -81.70500)


To reach the tidal bench marks from the intersection of Interstate Highway I-295
and U.S. Highway 17, proceed  north on U.S. Highway 17 for 6.9 km (4.3 mi) to
its intersection with State Highway C-211 (Ortega River Boulevard and Grand
Avenue), then turn right and proceed NW on Highway C-211 for 3.1 km (1.9 mi) to
the dirt drive leading to the residence of the Van Dorens.  The bench marks are
along Highway C-211 (Grand Avenue).  The tide gage and staff were located on a
pier owned by the Van Dorens.


                         T I D A L   B E N C H   M A R K S


                 PRIMARY BENCH MARK STAMPING:  NO 1 1939
                         DESIGNATION:          872 0296 TIDAL 1

MONUMENTATION:           Tidal Station disk                    VM#:         5167
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  BC2456
SETTING CLASSIFICATION:  Concrete sea wall                     OPUS PID:        
LATITUDE:   30° 16.7' N (  30.27861)          LONGITUDE:  81° 42.2' W ( -81.70333)


The primary bench mark bench mark is a disk set in the center of a concrete sea
wall at the SW side of grand boulevard, 113.2 m (371.5 ft) SE of the SE end of
the highway bridge over the Ortega River, 50.7 m (166.5 ft) SE of bench mark 872
0296 TIDAL 2, 12.3 m (40.4 ft) SW of the centerline of the southbound lane of
Grand Avenue, and 2.9 m (9.4 ft) NW of the southeasternmost ornamental concrete
pillar on the seawall.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  7

                                                                                
Station ID: 8720296                         PUBLICATION DATE:  11/10/2010
Name:       ORTEGA RIVER ENTRANCE                             
            FL
NOAA Chart: 11492                           Latitude:   30° 16.7' N (  30.27830)
USGS Quad:  JACKSONVILLE                    Longitude:  81° 42.3' W ( -81.70500)


                         T I D A L   B E N C H   M A R K S


                         BENCH MARK STAMPING:  NO 2 1939
                         DESIGNATION:          872 0296 TIDAL 2

MONUMENTATION:           Tidal Station disk                    VM#:         5168
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  BC2455
SETTING CLASSIFICATION:  Concrete sea wall                     OPUS PID:        
LATITUDE:   30° 16.7' N (  30.27889)          LONGITUDE:  81° 42.2' W ( -81.70361)


The bench mark is a disk set in the center of a concrete sea wall at the SW side
of Grand Boulevard, located on the south shore of the Ortega River along State
Highway C-211,  62.5 m (205.0 ft) SE of the SE end of the Ortega River bridge,
50.7 m (166.5 ft) NW of bench mark NO 1 1939 and 12.6 m (41.2 ft) SW of the
centerline of Grand Avenue.  



                         BENCH MARK STAMPING:  0296 A 1978
                         DESIGNATION:          872 0296 A TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         5169
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  BC2457
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID:        
LATITUDE:   30° 16.7' N (  30.27833)          LONGITUDE:  81° 42.2' W ( -81.70278)


The bench mark is a disk located in the traffic island SE of the Ortega River
bridge, 49.4 m (162.0 ft) SE of the NW end of the median island, 48.0 m (157.0
ft) SE of the north end of the traffic island, 46.6 m (153.0 ft) NW of the
intersection of Grand Avenue and McGirts Boulevard, 6.1 m (20.0 ft) SSW of the
centerline of the northbound lane of Grand Avenue, 6.2 m (20.5 ft) NNE of the
centerline of the southbound lane of Grand Avenue, and 5.0 m (16.4 ft) SE of a
wooden light pole NO 115379 in the median, and 0.3 m (1.0 ft) NW of a carsonite
witness post.  The bench mark is set at ground level, crimped to a rod driven
12.2 m (40.0 ft) to refusal, and encased in a PVC pipe with concrete kickblock. 
A magnet was buried at the south side of the mark.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  7

                                                                                
Station ID: 8720296                         PUBLICATION DATE:  11/10/2010
Name:       ORTEGA RIVER ENTRANCE                             
            FL
NOAA Chart: 11492                           Latitude:   30° 16.7' N (  30.27830)
USGS Quad:  JACKSONVILLE                    Longitude:  81° 42.3' W ( -81.70500)


                         T I D A L   B E N C H   M A R K S


                         BENCH MARK STAMPING:  0296 B 1978
                         DESIGNATION:          872 0296 B TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         5170
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  BC2458
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID:        
LATITUDE:   30° 16.7' N (  30.27806)          LONGITUDE:  81° 42.1' W ( -81.70222)


The bench mark is a disk located 23.8 m (78.0 ft) SE of the centerline of
McGirts Boulevard, 21.4 m (70.3 ft) south of wooden power pole NO. 2803 at the
east corner of the intersection of Grand Avenue and McGirts Boulevards, 19.1 m
(62.5 ft) east of wooden power pole NO.2802 at the south corner of Grand Avenue
and Buena Vista Avenue, 19.1 m (62.5 ft) WSW of the northern most corner of a
low stucco wall, 16.0 m (54.0 ft) east of the intersection of Grand Avenue and
El Dorado Avenue, 14.5 m (47.5 ft) SE of the NW end of the second traffic island
of Grand Avenue south of the bridge, 14.3 m (46.8 ft) east of an old metal light
pole, 5.9 m (19.5 ft) SW of the northbound lane of Grand Avenue, 5.6 m (18.5 ft)
NE of the centerline of the southbound lane of Grand Avenue and 0.3 m (1.0 ft)
NW of a carsonite witness post.  The bench mark is recessed 15.0 cm (0.5 ft)
below ground level, crimped to a copper-clad steel rod driven 12.8 m (42.0 ft)
to refusal, and encased in a PVC pipe with concrete kickblock.  A magnet was
buried at the south side of the mark.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  7

                                                                                
Station ID: 8720296                         PUBLICATION DATE:  11/10/2010
Name:       ORTEGA RIVER ENTRANCE                             
            FL
NOAA Chart: 11492                           Latitude:   30° 16.7' N (  30.27830)
USGS Quad:  JACKSONVILLE                    Longitude:  81° 42.3' W ( -81.70500)


                         T I D A L   B E N C H   M A R K S


                         BENCH MARK STAMPING:  0296 D 2004
                         DESIGNATION:          872 0296 D TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:        19318
AGENCY:                  FL Department of Transportation (FLDOT)IDB PID#:  DI0180
SETTING CLASSIFICATION:  Concrete sidewalk                     OPUS PID#: DI0180
LATITUDE:   30° 16.8' N (  30.27944)          LONGITUDE:  81° 42.2' W ( -81.70417)


The bench mark is a disk set in a 1.2 m (4.0 ft) wide concrete sidewalk over the
south abutment of the San Juan Boulevard (Grand Avenue) bridge over the Ortega
River, located  67.1 m (220.0 ft) NNW of bench mark 872 0296 TIDAL 2, 9.4 m
(31.0 ft) NW of asphalt pavement, 6.8 m (22.3 ft) SSE of an aluminum light pole,
5.4 m (17.6 ft) WSW of the centerline of San Juan Boulevard (Grand Avenue) and
3.1 m (10.3 ft) north of a 1.1 m by 1.2 m (3.5 ft by 4.0 ft) ornamental column
stamped 720005 at the south corner of the bridge.  

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  7

                                                                                
Station ID: 8720296                         PUBLICATION DATE:  11/10/2010
Name:       ORTEGA RIVER ENTRANCE                             
            FL
NOAA Chart: 11492                           Latitude:   30° 16.7' N (  30.27830)
USGS Quad:  JACKSONVILLE                    Longitude:  81° 42.3' W ( -81.70500)


                         T I D A L   B E N C H   M A R K S


                         BENCH MARK STAMPING:  DUV 37
                         DESIGNATION:          DUV 37

MONUMENTATION:           Bench Mark disk                       VM#:        19319
AGENCY:                  FL Department of Transportation (FLDOT)IDB PID#:  BC2453
SETTING CLASSIFICATION:  Bridge walkway                        OPUS PID:        
LATITUDE:   30° 17.4' N (  30.28972)          LONGITUDE:  81° 42.8' W ( -81.71306)


The bench mark is a disk set in a bridge walkway, located at the SE corner of
the bridge, 8.8 m (29.0 ft) east of the centerline of State Road 211, 0.3 m (1.0
ft) west of a metal guardrail, and 0.3 m (1.0 ft) east of the curbing.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  6 of  7

                                                                                
Station ID: 8720296                         PUBLICATION DATE:  11/10/2010
Name:       ORTEGA RIVER ENTRANCE                             
            FL
NOAA Chart: 11492                           Latitude:   30° 16.7' N (  30.27830)
USGS Quad:  JACKSONVILLE                    Longitude:  81° 42.3' W ( -81.70500)


                            T I D A L   D A T U M S 


Tidal datums at ORTEGA RIVER ENTRANCE based on:

     LENGTH OF SERIES:      6 MONTHS
     TIME PERIOD:           August 1978 - January 1979
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8720220 MAYPORT (FERRY DEPOT), SAINT JOHNS RIVER


Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:

     MEAN HIGHER HIGH WATER                     MHHW   =  0.380
     MEAN HIGH WATER                            MHW    =  0.351
     North American Vertical Datum              NAVD88 =  0.190
     MEAN TIDE LEVEL                            MTL    =  0.185
     MEAN SEA LEVEL                             MSL    =  0.171
     MEAN LOW WATER                             MLW    =  0.018
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     NO 1 1939                                   2.108    1.757
     NO 2 1939                                   2.074    1.723
     0296 A 1978                                 3.559    3.208
     0296 B 1978                                 5.304    4.953
     0296 D 2004                                 3.269    2.918
     DUV 37                                      3.634    3.283


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 0296 D 2004 and DUV 37 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: 8720296                         PUBLICATION DATE:  11/10/2010
Name:       ORTEGA RIVER ENTRANCE                             
            FL
NOAA Chart: 11492                           Latitude:   30° 16.7' N (  30.27830)
USGS Quad:  JACKSONVILLE                    Longitude:  81° 42.3' W ( -81.70500)


                             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.

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Products available at 8720296 ORTEGA RIVER ENTRANCE, FL

Revised: 08/08/2018
NOAA / National Ocean Service
Web site owner: Center for Operational Oceanographic Products and Services