U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 10
Station ID: 8720242 PUBLICATION DATE: 03/25/2010
Name: LONGBRANCH (USE-DDP), ST JOHNS RIVER
FL
NOAA Chart: 11488 Latitude: 30° 21.6' N ( 30.36000)
USGS Quad: ARLINGTON Longitude: 81° 37.2' W ( -81.62000)
To reach the tidal bench marks from the intersection of U. S. Highway 17 and U.
S. Highway Alternate 1, proceed east on U. S. Highway Alternate 1 (21st Street)
to Talleyrand Avenue, then turn right and proceed south on Talleyrand Avenue to
the entrance of the Army Corp of Engineers Depot. The bench marks are on the
Depot property. The tide station was located on the concrete bulkhead on the
north side of the boat basin.
T I D A L B E N C H M A R K S
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 10
Station ID: 8720242 PUBLICATION DATE: 03/25/2010
Name: LONGBRANCH (USE-DDP), ST JOHNS RIVER
FL
NOAA Chart: 11488 Latitude: 30° 21.6' N ( 30.36000)
USGS Quad: ARLINGTON Longitude: 81° 37.2' W ( -81.62000)
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: STJO 204 1973 RPS JAX FLA
DESIGNATION: STJO 204
MONUMENTATION: Survey disk VM#: 5129
AGENCY: US Army Corps of Engineers (USE) IDB PID#: BC1572
SETTING CLASSIFICATION: Concrete bulkhead OPUS PID#: BC1572
LATITUDE: 30° 21.4' N ( 30.35722) LONGITUDE: 81° 37.3' W ( -81.62083)
The primary bench mark is a disk set in a concrete bulkhead in the NE corner of
the boat slip, 17.3 m (56.7 ft) SE of the NW corner of a chain link fence, 10.4
m (34.0 ft) SW of the NW end of the boat slip, and 1.6 m (5.3 ft) south of a
chain link fence.
BENCH MARK STAMPING: NO 4 1928
DESIGNATION: 872 0242 TIDAL 4
MONUMENTATION: Tidal Station disk VM#: 5126
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: BC0354
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 30° 21.3' N ( 30.35500) LONGITUDE: 81° 37.5' W ( -81.62528)
The bench mark is a disk set near the east corner of the concrete footing of the
SE leg for a water tank (tank removed) at the SW angle of the intersection of
Talleyrand Avenue and East 18th Street, just south of Fire Station #11, 44.0 m
(144.4 ft) south of the approximate center of 18th Street, 12.7 m (41.7 ft) west
of and level with the centerline of the southbound lanes of Talleyrand Avenue,
5.6 m (18.4 ft) south of the SE corner of a storage room at Fire Station #11,
0.3 m (1.0 ft) east of a chainlink fence, and 21.3 cm (0.7 ft) above ground
level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 10
Station ID: 8720242 PUBLICATION DATE: 03/25/2010
Name: LONGBRANCH (USE-DDP), ST JOHNS RIVER
FL
NOAA Chart: 11488 Latitude: 30° 21.6' N ( 30.36000)
USGS Quad: ARLINGTON Longitude: 81° 37.2' W ( -81.62000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: D 142 1954
DESIGNATION: D 142
MONUMENTATION: Bench Mark disk VM#: 5127
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: BC0350
SETTING CLASSIFICATION: Building OPUS PID:
LATITUDE: 30° 21.2' N ( 30.35389) LONGITUDE: 81° 38.4' W ( -81.63917)
The bench mark is a disk set vertically in the north face of the NW corner of J.
Allen Axon Elementary School (Public School Number 8) located at the SE corner
of East 17th Street and Franklin Street, 12.2 m (40.0 ft) south of the
approximate center of East 17th Street, 11.0 m (36.1 ft) west of the approximate
center of Franklin Street, and 0.3 m (1.0 ft) above ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 10
Station ID: 8720242 PUBLICATION DATE: 03/25/2010
Name: LONGBRANCH (USE-DDP), ST JOHNS RIVER
FL
NOAA Chart: 11488 Latitude: 30° 21.6' N ( 30.36000)
USGS Quad: ARLINGTON Longitude: 81° 37.2' W ( -81.62000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: STJO 175 RPS 1973 FLA
DESIGNATION: STJO 175
MONUMENTATION: Survey disk VM#: 5128
AGENCY: US Army Corps of Engineers (USE) IDB PID#: BC1569
SETTING CLASSIFICATION: Concrete dock OPUS PID:
LATITUDE: 30° 21.4' N ( 30.35611) LONGITUDE: 81° 37.2' W ( -81.61972)
The bench mark is a disk set in the top of a concrete dock located on the
grounds of the Army Corp of Engineers Depot, 69.5 m (228.0 ft) east of the west
corner of a chainlink fence, 4.6 m (15.1 ft) east of a large metal cleat on the
edge of the shipping dock, and 2.3 m (7.4 ft) south of the north corner of the
docking pier.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 10
Station ID: 8720242 PUBLICATION DATE: 03/25/2010
Name: LONGBRANCH (USE-DDP), ST JOHNS RIVER
FL
NOAA Chart: 11488 Latitude: 30° 21.6' N ( 30.36000)
USGS Quad: ARLINGTON Longitude: 81° 37.2' W ( -81.62000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: STJO 205 1973 JAX FLA
DESIGNATION: STJO 205
MONUMENTATION: Survey disk VM#: 5130
AGENCY: US Army Corps of Engineers (USE) IDB PID#: BC1571
SETTING CLASSIFICATION: Concrete bulkhead OPUS PID:
LATITUDE: 30° 21.4' N ( 30.35667) LONGITUDE: 81° 37.3' W ( -81.62111)
The bench mark is a disk set in the top of a concrete bulkhead at the SE corner
of the boat slip, 21.2 m (69.5 ft) SE of a flagpole, 3.2 m (10.5 ft) SE of the
NE corner of a chainlink fence, and 0.2 m (0.7 ft) north of the southernmost tip
of the west side of the boat slip.
BENCH MARK STAMPING: 0242 A 1995
DESIGNATION: 872 0242 A
MONUMENTATION: Flange-encased Rod VM#: 5131
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID#: BBBZ31
LATITUDE: 30° 21.8' N ( 30.36250) LONGITUDE: 81° 37.3' W ( -81.62167)
The bench mark is a flanged-encased rod, located 56.3 m (184.7 ft) east of the
NE corner of the Army Corp of Engineers warehouse building, 22.5 m (73.7 ft)
east of bench mark STJO 204 RPS 1973 JAX FLA, 9.9 m (32.4 ft) east of the east
corner of a 1.8 m (6.0 ft) tall chainlink fence, 4.1 m (13.3 ft) west of the
east end of the north side seawall, and 0.5 m (1.5 ft) north of the north side
of the sea wall. The datum point is recessed 12.2 cm (0.4 ft) below the 5-inch
NGS logo cap, being the top of a stainless steel rod driven to refusal at a
depth of 14.3 m (46.8 ft) encased in a 5-inch NGS logo cap flush with the
ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 10
Station ID: 8720242 PUBLICATION DATE: 03/25/2010
Name: LONGBRANCH (USE-DDP), ST JOHNS RIVER
FL
NOAA Chart: 11488 Latitude: 30° 21.6' N ( 30.36000)
USGS Quad: ARLINGTON Longitude: 81° 37.2' W ( -81.62000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 0242 B 1995
DESIGNATION: 872 0242 B TIDAL
MONUMENTATION: Flange-encased Rod VM#: 5134
AGENCY: National Ocean Service (NOS) IDB PID#: DI9224
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 30° 21.6' N ( 30.36083) LONGITUDE: 81° 37.9' W ( -81.63222)
The bench mark is a flange-encased rod located near the intersection of the 19th
Street and Talleyrand Avenue, 19.8 m (65.0 ft) west of the approximate center of
Talleyrand Avenue, 7.6 m (25.0 ft) north of the approximate center of East 19th
Street, 3.6 m (11.9 ft) NE of the center of a 1.2 m x 1.5 m (4.0 ft x 5.0 ft)
storm water drain, 0.3 m (1.1 ft) south of a 1.8 m (6.0 ft) tall chainlink fence
line, and 0.3 m (1.0 ft) south of a carsonite witness post. The datum point is
recessed 12.2 cm (0.4 ft) below the 5-inch NGS logo cap, being at the top of a
stainless steel rod driven to refusal at a depth of 20.1 m (66.0 ft) encased in
a 5-inch NGS logo cap flush with the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 10
Station ID: 8720242 PUBLICATION DATE: 03/25/2010
Name: LONGBRANCH (USE-DDP), ST JOHNS RIVER
FL
NOAA Chart: 11488 Latitude: 30° 21.6' N ( 30.36000)
USGS Quad: ARLINGTON Longitude: 81° 37.2' W ( -81.62000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: STJO 215 1973 JAX FL
DESIGNATION: STJO 215
MONUMENTATION: Survey disk VM#: 5138
AGENCY: US Army Corps of Engineers (USE) IDB PID#: BC1568
SETTING CLASSIFICATION: Concrete apron OPUS PID:
LATITUDE: 30° 21.4' N ( 30.35611) LONGITUDE: 81° 37.3' W ( -81.62083)
The bench mark is a disk set in the top of a concrete apron located along
waterfront, 27.4 m (89.8 ft) SE of the NE corner of the main warehouse, 26.8 m
(88.0 ft) east of a flagpole, and 1.5 m (4.9 ft) west of the east corner of a
chainlink fence.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 8 of 10
Station ID: 8720242 PUBLICATION DATE: 03/25/2010
Name: LONGBRANCH (USE-DDP), ST JOHNS RIVER
FL
NOAA Chart: 11488 Latitude: 30° 21.6' N ( 30.36000)
USGS Quad: ARLINGTON Longitude: 81° 37.2' W ( -81.62000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: STJO 219 1974 JAX FLA
DESIGNATION: STJO 219
MONUMENTATION: Survey disk VM#: 13555
AGENCY: US Army Corps of Engineers (USE) IDB PID#: BC0355
SETTING CLASSIFICATION: Sidewalk OPUS PID:
LATITUDE: 30° 21.3' N ( 30.35500) LONGITUDE: 81° 37.5' W ( -81.62556)
The bench mark is a disk set in a sidewalk along the north side of Fire Station
#11, 17.3 m (56.8 ft) west of and level with the centerline of the southbound
lanes of Talleyrand Avenue, 16.8 m (55.1 ft) south of the approximate center of
18th Street, and 0.5 m (1.6 ft) NW of the NE corner of the Fire Station.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 9 of 10
Station ID: 8720242 PUBLICATION DATE: 03/25/2010
Name: LONGBRANCH (USE-DDP), ST JOHNS RIVER
FL
NOAA Chart: 11488 Latitude: 30° 21.6' N ( 30.36000)
USGS Quad: ARLINGTON Longitude: 81° 37.2' W ( -81.62000)
T I D A L D A T U M S
Tidal datums at LONGBRANCH (USE-DDP), ST JOHNS RIVER based on:
LENGTH OF SERIES: 1 YEAR
TIME PERIOD: March 2002 - February 2003
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8720218 BAR PILOTS DOCK, ST JOHNS RIVER
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (10/07/1998) = 1.578
MEAN HIGHER HIGH WATER MHHW = 0.828
MEAN HIGH WATER MHW = 0.799
North American Vertical Datum NAVD88 = 0.503
MEAN SEA LEVEL MSL = 0.418
MEAN TIDE LEVEL MTL = 0.416
MEAN LOW WATER MLW = 0.033
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (01/10/1996) = -1.761
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
STJO 204 1973 RPS JAX FLA 1.549 0.750
NO 4 1928 3.730 2.931
D 142 1954 6.567 5.768
STJO 175 RPS 1973 FLA 2.279 1.480
STJO 205 1973 JAX FLA 1.518 0.719
0242 A 1995 1.892 1.093
0242 B 1995 2.905 2.106
STJO 215 1973 JAX FL 2.462 1.663
STJO 219 1974 JAX FLA 3.684 2.885
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 10 of 10
Station ID: 8720242 PUBLICATION DATE: 03/25/2010
Name: LONGBRANCH (USE-DDP), ST JOHNS RIVER
FL
NOAA Chart: 11488 Latitude: 30° 21.6' N ( 30.36000)
USGS Quad: ARLINGTON Longitude: 81° 37.2' W ( -81.62000)
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.