U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  9

                                                                                
Station ID: 8726667                         PUBLICATION DATE:  12/17/2020
Name:       CSX ROCKPORT, MCKAY BAY ENTRANCE                  
            FL
NOAA Chart: 11412                           Latitude:   27° 54.8' N (  27.91333)
USGS Quad:  TAMPA                           Longitude:  82° 25.5' W ( -82.42500)


To reach the tidal bench marks from the intersection of U.S. Highway 41 and
Causeway Boulevard (U.S. Business 41), proceed west on Causeway Boulevard for
1.6 km (1.0 mi) to the access road for Rockport Terminal, then go south on the
access road for 1.1 km (0.7 mi) to the Rockport Terminal.  The bench marks are
located around the terminal between the loading dock and railroad tracks.  The
tide gauge is located at the south end of the loading dock west of the conveyor
building.  DCP 3 is located along Causeway BLVD approx. 0.55 km (0.34 miles)
west of access road for Rockport Terminal On berth 150 at the SE corner of the
seawall.


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


                 PRIMARY BENCH MARK STAMPING:  6667 J 1991
                         DESIGNATION:          872 6667 J

MONUMENTATION:           Tidal Station disk                    VM#:         6825
AGENCY:                  National Ocean Service (NOS)          IDB PID#:  DL1851
SETTING CLASSIFICATION:  Concrete foundation of loader stop    OPUS PID:        
LATITUDE:   27° 54.8' N (  27.91344)          LONGITUDE:  82° 25.4' W ( -82.42414)


The primary bench mark is a disk set in the SW corner of the concrete foundation
of a stop for the bulk loader that travels on rails along the waterfront, 18.41
m (60.40 ft) NE of the NE corner of the concrete walkway leading to the dock,
3.72 m (12.20 ft) WNW of the west rail of the bulk loader, and 0.91 m (2.99 ft)
WSW of the SW corner of the stop.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  9

                                                                                
Station ID: 8726667                         PUBLICATION DATE:  12/17/2020
Name:       CSX ROCKPORT, MCKAY BAY ENTRANCE                  
            FL
NOAA Chart: 11412                           Latitude:   27° 54.8' N (  27.91333)
USGS Quad:  TAMPA                           Longitude:  82° 25.5' W ( -82.42500)


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


                         BENCH MARK STAMPING:  6667 C 1976
                         DESIGNATION:          872 6667 C TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         6820
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AG7506
SETTING CLASSIFICATION:  sidewalk                              OPUS PID:        
LATITUDE:   27° 54.9' N (  27.91531)          LONGITUDE:  82° 25.3' W ( -82.42233)


The bench mark is a disk set on the concrete porch located along the SE wall of
the Seaboard Coastline Railroad terminal office, SE of the boat mooring area,
75.3 m (247.0 ft) west of bench mark 6667 E 1976, 7.99 m (26.21 ft) SW of the
east corner of the building, and 0.85 m (2.79 ft) SE of the SE wall of the
building.



                         BENCH MARK STAMPING:  6667 F 1976
                         DESIGNATION:          872 6667 F TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         6822
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AG7504
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID#: AG7504
LATITUDE:   27° 55.0' N (  27.91661)          LONGITUDE:  82° 25.2' W ( -82.42022)


The bench mark is a disk located on the north side of the access road near the
Guard Shack and the entrance gate, 29.40 m (96.45 ft) WSW of the NS fence line,
6.15 m (20.17 ft) NNW of a chainlink fence 0.38 m (1.24 ft) west of power pole
number 9 with a light, the last pole on the NE end of the property, and 0.3 m
(0.98 ft) above road level.  The bench mark is crimped to a copper-coated steel
rod driven 12.2 m (40.0 ft) to refusal, and encased in a PVC pipe with concrete
kickblock.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  9

                                                                                
Station ID: 8726667                         PUBLICATION DATE:  12/17/2020
Name:       CSX ROCKPORT, MCKAY BAY ENTRANCE                  
            FL
NOAA Chart: 11412                           Latitude:   27° 54.8' N (  27.91333)
USGS Quad:  TAMPA                           Longitude:  82° 25.5' W ( -82.42500)


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


                         BENCH MARK STAMPING:  6667 G 1990
                         DESIGNATION:          872 6667 G

MONUMENTATION:           Tidal Station disk                    VM#:         6823
AGENCY:                  National Ocean Service (NOS)          IDB PID#:  DL1807
SETTING CLASSIFICATION:  Mooring bollard base                  OPUS PID#: DL1807
LATITUDE:   27° 55.0' N (  27.91711)          LONGITUDE:  82° 25.3' W ( -82.42178)


The bench mark is a disk set in the SW corner of the concrete base of a mooring
bollard located near the NE end of the loading dock, 28.29 m (92.81 ft) NW of
the NW corner of the restroom building, 23.9 m (78.4 ft) NW of power pole
#2636940260, 2.80 m (9.19 ft) north of the centerline of the concrete ramp
leading to the dock, 1.98 m (6.50 ft) west of the top edge of the riprap sea
wall, and 0.18 m (0.59 ft) above ground.



                         BENCH MARK STAMPING:  6667 H 1990
                         DESIGNATION:          872 6667 H

MONUMENTATION:           Tidal Station disk                    VM#:         6824
AGENCY:                  National Ocean Service (NOS)          IDB PID:         
SETTING CLASSIFICATION:  Concrete foundation                   OPUS PID:        
LATITUDE:   27° 55.0' N (  27.91708)          LONGITUDE:  82° 25.2' W ( -82.41931)


The bench mark is a disk set in the SE corner of the concrete foundation of a
steel arm structure located at the railroad unloading building,13.5 m (44.4 ft)
west of the centerline of the access road, 7.8 m (25.5 ft) east of power pole
#644540245, 6.68 m (21.90 ft) NE of the NE corner of the railroad unloading
buidling, and 0.15 m (0.49 ft) above ground level.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  9

                                                                                
Station ID: 8726667                         PUBLICATION DATE:  12/17/2020
Name:       CSX ROCKPORT, MCKAY BAY ENTRANCE                  
            FL
NOAA Chart: 11412                           Latitude:   27° 54.8' N (  27.91333)
USGS Quad:  TAMPA                           Longitude:  82° 25.5' W ( -82.42500)


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


                         BENCH MARK STAMPING:  6667 B 1976
                         DESIGNATION:          872 6667 B TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:        20521
AGENCY:                  Florida Department of Natural ResourcesIDB PID#:  AG7505
SETTING CLASSIFICATION:  Railroad bell base                    OPUS PID:        
LATITUDE:   27° 54.9' N (  27.91539)          LONGITUDE:  82° 25.3' W ( -82.42225)


The bench mark is a disk set in the concrete foundation for a brass bell located
on the property of the Seaboard Coastline Railroad, 34.44 m (113 ft) SE of
telephone pole #26343 40217 on NW side of the access road, 13.41 m (44 ft) NW of
centerline of Sagasta St running in front of the terminal office, 7.01 m (23 ft)
east of eastern corner of the terminal office buiding.



                         BENCH MARK STAMPING:  8726667 K 2019
                         DESIGNATION:          872 6667 K

MONUMENTATION:           Bench Mark disk                       VM#:        23099
AGENCY:                  National Ocean Service                IDB PID:         
SETTING CLASSIFICATION:  Concrete seawall                      OPUS PID#: BBGP17
LATITUDE:   27° 55.4' N (  27.92322)          LONGITUDE:  82° 25.3' W ( -82.42128)


The bench mark is a nos brass disk set in the seawall, 12.8 m (42.0 ft)  south
of the edge of perimeter fence. 7.6 m (24.9 ft) north of the mwwl stand and 46
cm (18 inches) west of the seawall edge.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  9

                                                                                
Station ID: 8726667                         PUBLICATION DATE:  12/17/2020
Name:       CSX ROCKPORT, MCKAY BAY ENTRANCE                  
            FL
NOAA Chart: 11412                           Latitude:   27° 54.8' N (  27.91333)
USGS Quad:  TAMPA                           Longitude:  82° 25.5' W ( -82.42500)


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


                         BENCH MARK STAMPING:  8726667 L 2019
                         DESIGNATION:          872 6667 L

MONUMENTATION:           Flange-encased Rod                    VM#:        23100
AGENCY:                  National Ocean Service                IDB PID:         
SETTING CLASSIFICATION:  Stainless steel rod in sleeve         OPUS PID:        
LATITUDE:   27° 55.5' N (  27.92436)          LONGITUDE:  82° 25.2' W ( -82.42011)


The bench mark is a flange-encased rod set 2.8 m (9.2 ft)east-northeast of power
pole # 26424-40527.  1.1 m (3.6 ft)south of edge of concrete of highway.  0.7 m
(2.3 ft)south to centerline of sidewalk. The datum point is a top of a stainless
steel rod driven 14 m (45.9 ft) to refusal and encased in a 6 inch (15 cm) well
and aluminum cap set in a concrete kickplate.



                         BENCH MARK STAMPING:  8726667 M 2019
                         DESIGNATION:          872 6667 M

MONUMENTATION:           Bench Mark disk                       VM#:        23101
AGENCY:                  National Ocean Service                IDB PID:         
SETTING CLASSIFICATION:  Power pole base                       OPUS PID:        
LATITUDE:   27° 55.4' N (  27.92372)          LONGITUDE:  82° 25.2' W ( -82.41922)


The bench mark is a brass disk set in the south side base of a power pole, 53 m
(173.9 ft) west-northwest of power pole next to telephone pole #453827.  25 m
(82.0 ft) east-southeast of power pole unmarked.  2.3 m (7.5 ft) sourh of
centerline of sidewalk.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  6 of  9

                                                                                
Station ID: 8726667                         PUBLICATION DATE:  12/17/2020
Name:       CSX ROCKPORT, MCKAY BAY ENTRANCE                  
            FL
NOAA Chart: 11412                           Latitude:   27° 54.8' N (  27.91333)
USGS Quad:  TAMPA                           Longitude:  82° 25.5' W ( -82.42500)


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


                         BENCH MARK STAMPING:  8726667 N 2019
                         DESIGNATION:          872 6667 N

MONUMENTATION:           Bench Mark disk                       VM#:        23102
AGENCY:                  National Ocean Service                IDB PID:         
SETTING CLASSIFICATION:  Light pole base                       OPUS PID:        
LATITUDE:   27° 55.4' N (  27.92317)          LONGITUDE:  82° 25.1' W ( -82.41800)


The bench mark is a brass disk set in base of light pole, 48.5 m (159.1 ft)
west-northwest of power pole 014615.  19.4 m (63.6 ft) south of centerline of
highway.  1.2 m (3.9 ft) north of center of sidewalk.



                         BENCH MARK STAMPING:  8726667 P 2019
                         DESIGNATION:          872 6667 P

MONUMENTATION:           Bench Mark disk                       VM#:        23103
AGENCY:                  National Ocean Service                IDB PID:         
SETTING CLASSIFICATION:  Light pole base                       OPUS PID:        
LATITUDE:   27° 55.4' N (  27.92300)          LONGITUDE:  82° 25.0' W ( -82.41714)


The bench mark is a brass disk set in the base of a light pole, 52 m (170.6 ft)
west of power pole 019844.  43.4 m (142.4 ft) ENE of power pole 014615.  19.4 m
(63.6 ft) south of centerline of highway.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  7 of  9

                                                                                
Station ID: 8726667                         PUBLICATION DATE:  12/17/2020
Name:       CSX ROCKPORT, MCKAY BAY ENTRANCE                  
            FL
NOAA Chart: 11412                           Latitude:   27° 54.8' N (  27.91333)
USGS Quad:  TAMPA                           Longitude:  82° 25.5' W ( -82.42500)


                            T I D A L   D A T U M S 


Tidal datums at CSX ROCKPORT, MCKAY BAY ENTRANCE based on:

     LENGTH OF SERIES:      14 YEARS
     TIME PERIOD:           1/1999 - 12/2007 & 1/2015 - 12/2019
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8726520 ST. PETERSBURG, TAMPA BAY


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

     HIGHEST OBSERVED WATER LEVEL (10/08/1996)         =  2.128
     MEAN HIGHER HIGH WATER                     MHHW   =  0.817
     MEAN HIGH WATER                            MHW    =  0.717
     North American Vertical Datum              NAVD88 =  0.514
     MEAN SEA LEVEL                             MSL    =  0.443
     MEAN TIDE LEVEL                            MTL    =  0.434
     MEAN LOW WATER                             MLW    =  0.152
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (09/11/2017)         = -1.417

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     6667 J 1991                                 3.037    2.320
     6667 C 1976                                 3.102    2.385
     6667 F 1976                                 3.200    2.483
     6667 G 1990                                 2.846    2.129
     6667 H 1990                                 3.369    2.652
     6667 B 1976                                 3.100    2.383
     8726667 K 2019                              3.371    2.654
     8726667 L 2019                              3.066    2.349
     8726667 M 2019                              3.953    3.236
     8726667 N 2019                              2.887    2.170
     8726667 P 2019                              2.703    1.986


                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  8 of  9

                                                                                
Station ID: 8726667                         PUBLICATION DATE:  12/17/2020
Name:       CSX ROCKPORT, MCKAY BAY ENTRANCE                  
            FL
NOAA Chart: 11412                           Latitude:   27° 54.8' N (  27.91333)
USGS Quad:  TAMPA                           Longitude:  82° 25.5' W ( -82.42500)


Foot Notes:

Bench marks K, L, M, N, and P are based on one differential leveling connection
and do not meet the quality control standards of the NOS. Therefore, caution
should be used when deriving elevations for these marks.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  9 of  9

                                                                                
Station ID: 8726667                         PUBLICATION DATE:  12/17/2020
Name:       CSX ROCKPORT, MCKAY BAY ENTRANCE                  
            FL
NOAA Chart: 11412                           Latitude:   27° 54.8' N (  27.91333)
USGS Quad:  TAMPA                           Longitude:  82° 25.5' W ( -82.42500)


                             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.