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  4

                                                                                
Station ID: 8720213                         PUBLICATION DATE:  02/26/2004
Name:       TROUT R., SHERWOOD FOREST                         
            FL
NOAA Chart: 11488                           Latitude:   30° 25.2' N (  30.42000)
USGS Quad:  TROUT RIVER                     Longitude:  81° 43.7' W ( -81.72830)


To reach the tidal bench marks from the intersection of Edgewood Avenue and Lem
Turner Road in Jacksonville, proceed north along Lem Turner Road for 3.2 km (2.0
mi), then west on Trout River Boulevard for 3.2 km (2.0 mi) to 5339 Trout River
Boulevard.  The bench marks are located along Trout River Boulevard and Sibbald
Avenue.  The tide gage and staff were located on a private dock behind the
residence at 5339 Trout River Boulevard.


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


                 PRIMARY BENCH MARK STAMPING:  0213 C 1978
                         DESIGNATION:          872 0213 C TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         5090
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  BC2480
SETTING CLASSIFICATION:  Concrete bridge guardrail             OPUS PID:        
LATITUDE:   30° 24.9' N (  30.41583)          LONGITUDE:  81° 44.0' W ( -81.73342)


The primary bench mark is a disk set in a 0.3 m x 1 m (1 ft x 2 ft) concrete
guardrail located on the SE corner of the Trout River Boulevard bridge over Nine
Mile Creek, 6.22 m (20.4 ft) south of the centerline of Trout River Boulevard, 2
m (6 ft) west of a witness post, and 0.40 m (1.3 ft) south of the bridge
railing, and 1 m (3 ft) above the road.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  4

                                                                                
Station ID: 8720213                         PUBLICATION DATE:  02/26/2004
Name:       TROUT R., SHERWOOD FOREST                         
            FL
NOAA Chart: 11488                           Latitude:   30° 25.2' N (  30.42000)
USGS Quad:  TROUT RIVER                     Longitude:  81° 43.7' W ( -81.72830)


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


                         BENCH MARK STAMPING:  0213 D 1978
                         DESIGNATION:          872 0213 D TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         5091
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  BC2478
SETTING CLASSIFICATION:  Concrete head wall                    OPUS PID#: BC2478
LATITUDE:   30° 24.7' N (  30.41194)          LONGITUDE:  81° 43.9' W ( -81.73194)


The bench mark is a disk set in a concert head wall, 29 m (96 ft) north of the
intersection of Sibbald Road and Gilchrist Road, 12 m (40 ft) east of the
centerline of the south bound lane of Sibbald Road, 6 m (20 ft) west of the
centerline of the north bound lane of Sibbald Road, and 0.76 m (2.5 ft) south of
a witness post.



                         BENCH MARK STAMPING:  0213 E 1978
                         DESIGNATION:          872 0213 E TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         5092
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  BC2477
SETTING CLASSIFICATION:  Concrete head wall                    OPUS PID:        
LATITUDE:   30° 24.0' N (  30.40011)          LONGITUDE:  81° 44.5' W ( -81.74167)


The bench mark is a disk set in a concrete headwall, 0.6 km (0.4 mi) south of
the intersection of Gilchrist Road and New Kings Road (US Highway 1), 19 m (61
ft) west of the median of New Kings Road, 18 m (58 ft) NW of the centerline of a
the NW drive of the White and Son's Service Station, 9 m (30 ft) NE of a chain
link fence, and 1 m (3 ft) south of a witness post.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  4

                                                                                
Station ID: 8720213                         PUBLICATION DATE:  02/26/2004
Name:       TROUT R., SHERWOOD FOREST                         
            FL
NOAA Chart: 11488                           Latitude:   30° 25.2' N (  30.42000)
USGS Quad:  TROUT RIVER                     Longitude:  81° 43.7' W ( -81.72830)


                            T I D A L   D A T U M S 


Tidal datums at TROUT R., SHERWOOD FOREST based on:

     LENGTH OF SERIES:      4 MONTHS
     TIME PERIOD:           September 1978 - December 1978
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8720220 MAYPORT


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

     MEAN HIGHER HIGH WATER                     MHHW   =  0.868
     MEAN HIGH WATER                            MHW    =  0.825
     North American Vertical Datum              NAVD88 =  0.488
     MEAN TIDE LEVEL                            MTL    =  0.427
     MEAN SEA LEVEL                             MSL    =  0.420
     MEAN LOW WATER                             MLW    =  0.028
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     0213 C 1978                                 3.881    3.056
     0213 D 1978                                 3.162    2.337
     0213 E 1978                                 6.660    5.835

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

                                                                                
Station ID: 8720213                         PUBLICATION DATE:  02/26/2004
Name:       TROUT R., SHERWOOD FOREST                         
            FL
NOAA Chart: 11488                           Latitude:   30° 25.2' N (  30.42000)
USGS Quad:  TROUT RIVER                     Longitude:  81° 43.7' W ( -81.72830)


                             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.