Bench Mark Sheet for 8729757, MILTON

Superseded Epoch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Small blue map location marker Unpublished bench mark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  8

                                                                                
Station ID: 8729757                         PUBLICATION DATE:  04/29/2004
Name:       MILTON                                            
            FL
NOAA Chart: 11382                           Latitude:   30° 37.6' N (  30.62670)
USGS Quad:  MILTON SOUTH                    Longitude:  87°  2.2' W ( -87.03670)


To reach the tidal bench marks from the intersection of Willing Street and U.S.
Highway 90, at the west end of the U.S. Highway 90 bridge over the Blackwater
River, proceed NW on Willing Street for 0.2 km (0.1 mi) to Broad Street, then
proceed north on Broad Street for 0.3 km (0.2 mi) to its intersection with
Madison Street, then turn right and proceed east on Madison Street to a lot at
the end of the street.  The bench marks are along U.S. Highway 90, Broad Street,
and near the river's edge from the railroad bridge to Madison Street.  The tide
gage and staff were on a dock near a grass field at the foot of Madison Street.


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


                 PRIMARY BENCH MARK STAMPING:  9757 A 1977
                         DESIGNATION:          872 9757 A TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:        10229
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  BG4548
SETTING CLASSIFICATION:  Concrete box drain                    OPUS PID:        
LATITUDE:   30° 37.6' N (  30.62670)          LONGITUDE:  87°  2.2' W ( -87.03670)


The primary bench mark is a disk set in top of the SE corner of a concrete box
drain, 13.72 m (45.0 ft) west of the centerline of the driveway leading to the
last brick house on the north side of Madison Street, 4.79 m (15.7 ft) north of
centerline of Madison Street, and 2.10 m (6.9 ft) south of powerline pole NO
467E305.  Note: The disk is damaged.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  8

                                                                                
Station ID: 8729757                         PUBLICATION DATE:  04/29/2004
Name:       MILTON                                            
            FL
NOAA Chart: 11382                           Latitude:   30° 37.6' N (  30.62670)
USGS Quad:  MILTON SOUTH                    Longitude:  87°  2.2' W ( -87.03670)


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


                         BENCH MARK STAMPING:  9757 B 1977
                         DESIGNATION:          872 9757 B TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:        10230
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  BG4547
SETTING CLASSIFICATION:  Concrete abutment                     OPUS PID:        
LATITUDE:   30° 37.6' N (  30.62670)          LONGITUDE:  87°  2.3' W ( -87.03830)


The bench mark is a disk set in top of the south abutment of a small bridge, 0.2
km (0.1 mi) north of the junction of Broad Street and Willing Street, 180 m (590
ft) SSW of bench mark 9757 A 1977, 19.90 m (65.3 ft) north of a 35 mph speed
limit sign, and 4.85 m (15.9 ft) east of the centerline of Broad Street.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  8

                                                                                
Station ID: 8729757                         PUBLICATION DATE:  04/29/2004
Name:       MILTON                                            
            FL
NOAA Chart: 11382                           Latitude:   30° 37.6' N (  30.62670)
USGS Quad:  MILTON SOUTH                    Longitude:  87°  2.2' W ( -87.03670)


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


                         BENCH MARK STAMPING:  NO 1 1935
                         DESIGNATION:          TIDAL 1 STA III 93

MONUMENTATION:           Tidal Station disk                    VM#:        10231
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  BG0232
SETTING CLASSIFICATION:  Terra cotta tile pipe and concrete    OPUS PID:        
LATITUDE:   30° 37.4' N (  30.62330)          LONGITUDE:  87°  2.1' W ( -87.03500)


The bench mark is a disk set in the top of a 0.15 m (0.5 ft) diameter terra
cotta tile pipe and concrete, 46 m (150 ft) NE of the intersection of U.S.
Highway 90 and Willing Street, 14.94 m (49.0 ft) SW of the south corner of the
bridge over Blackwater River, 5.79 m (19.0 ft) SE of the centerline of the
highway, 6 m (19 ft) NE of the centerline of Simpson Street, 3.20 m (10.5 ft)
west of the west corner of a small brick building, and 0.03 m (0.1 ft) above
ground.  NOTE: Mark not recovered in 1985.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  8

                                                                                
Station ID: 8729757                         PUBLICATION DATE:  04/29/2004
Name:       MILTON                                            
            FL
NOAA Chart: 11382                           Latitude:   30° 37.6' N (  30.62670)
USGS Quad:  MILTON SOUTH                    Longitude:  87°  2.2' W ( -87.03670)


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


                         BENCH MARK STAMPING:  TT 67 G RESET 1951 1934
                         DESIGNATION:          TT 67 G RESET

MONUMENTATION:           Survey disk                           VM#:        10232
AGENCY:                  US Geological Survey (USGS)           IDB PID#:  BG0229
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   30° 37.3' N (  30.62170)          LONGITUDE:  87°  2.2' W ( -87.03670)


The bench mark is a disk set in the top of a concrete monument, on the lawn of
the Santa Rosa County Courthouse, 12.62 m (41.4 ft) SE of the SE curb of U.S.
Highway 90, 8.75 m (28.7 ft) NE of the NE curb of Elmira Street, 8.23 m (27.0
ft) WNW of the west corner of the courthouse, 0.76 m (2.5 ft) above the level of
the road, and 6 cm (0.2 ft) above ground level.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  8

                                                                                
Station ID: 8729757                         PUBLICATION DATE:  04/29/2004
Name:       MILTON                                            
            FL
NOAA Chart: 11382                           Latitude:   30° 37.6' N (  30.62670)
USGS Quad:  MILTON SOUTH                    Longitude:  87°  2.2' W ( -87.03670)


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


                         BENCH MARK STAMPING:  V 9 1918 2.316
                         DESIGNATION:          V 9

MONUMENTATION:           Bench Mark disk                       VM#:        10233
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  BG0231
SETTING CLASSIFICATION:  Bridge pier                           OPUS PID:        
LATITUDE:   30° 37.3' N (  30.62170)          LONGITUDE:  87°  2.0' W ( -87.03330)


The bench mark is a disk set in the top of the sest corner of the SW concrete
bridge pier foundation for the Louisville and Nashville Railroad bridge over the
Blackwater River, 3.35 m (11.0 ft) NW of the NW rail of the tracks, 0.24 m (0.8
ft) east of the west corner of the pier, 12.50 m (41.0 ft) NE of the SW end of
the bridge, 2.29 m (7.5 ft) below the track level, and 0.3 km (0.2 mi) SE along
Willing Street from the Santa Rosa Count Courthouse.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  6 of  8

                                                                                
Station ID: 8729757                         PUBLICATION DATE:  04/29/2004
Name:       MILTON                                            
            FL
NOAA Chart: 11382                           Latitude:   30° 37.6' N (  30.62670)
USGS Quad:  MILTON SOUTH                    Longitude:  87°  2.2' W ( -87.03670)


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


                         BENCH MARK STAMPING:  T 301 1968
                         DESIGNATION:          T 301

MONUMENTATION:           Bench Mark disk                       VM#:        17270
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  BG0236
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   30° 36.9' N (  30.61500)          LONGITUDE:  87°  2.3' W ( -87.03830)


The bench mark is a disk set in the top of a concrete monument, 0.6 km (0.4 mi)
SW along the railroad from bench mark V 9 1918 2.316, at the crossing of County
Road C-191 (Canal Street), 29.81 m (97.8 ft) SSE of the east corner of the
railroad station, 14.69 m (48.2 ft) SE of the SE rail of the main track, 14.87 m
(48.8 ft) SW of the centerline of Canal Street, 0.3 m (1.0 ft) NW of a fence,
0.6 m (2.0 ft) NE of a witness post, and 3 cm (0.1 ft) above ground level.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  7 of  8

                                                                                
Station ID: 8729757                         PUBLICATION DATE:  04/29/2004
Name:       MILTON                                            
            FL
NOAA Chart: 11382                           Latitude:   30° 37.6' N (  30.62670)
USGS Quad:  MILTON SOUTH                    Longitude:  87°  2.2' W ( -87.03670)


                            T I D A L   D A T U M S 


Tidal datums at MILTON based on:

     LENGTH OF SERIES:      2 MONTHS
     TIME PERIOD:           August 1977 - September 1977
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8729840 PENSACOLA, PENSACOLA BAY


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

     MEAN HIGHER HIGH WATER                     MHHW   =  0.482
     MEAN HIGH WATER                            MHW    =  0.444
     MEAN TIDE LEVEL                            MTL    =  0.243
     MEAN SEA LEVEL                             MSL    =  0.240
     North American Vertical Datum              NAVD88 =  0.145
     MEAN LOW WATER                             MLW    =  0.042
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     9757 A 1977                                 1.596    1.152
     9757 B 1977                                 2.532    2.088
     NO 1 1935                                   3.166    2.722
     TT 67 G RESET 1951 1934                     5.130    4.686
     V 9 1918 2.316                              0.748    0.304
     T 301 1968                                  2.798    2.354


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

                                                                                
Station ID: 8729757                         PUBLICATION DATE:  04/29/2004
Name:       MILTON                                            
            FL
NOAA Chart: 11382                           Latitude:   30° 37.6' N (  30.62670)
USGS Quad:  MILTON SOUTH                    Longitude:  87°  2.2' W ( -87.03670)


                             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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