U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 7
Station ID: 8720274 PUBLICATION DATE: 11/10/2010
Name: LITTLE POTTSBURG CREEK
FL
NOAA Chart: 11491 Latitude: 30° 18.6' N ( 30.31000)
USGS Quad: ARLINGTON Longitude: 81° 36.6' W ( -81.61000)
To reach the bench marks from the intersection of University Boulevard and
Atlantic Boulevard in Jacksonville, proceed west along Atlantic Boulevard for
1.0 km (0.6 mi) to the concrete bridge over Little Pottsburg Creek. The bench
marks are along the east bank of Little Pottsburg Creek. The tide station was
located on the second set of concrete bridge supports on the north side of the
bridge along the east shore of Little Pottsburg Creek.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 0274 A 1978
DESIGNATION: 872 0274 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 10708
AGENCY: National Ocean Survey (NOS) IDB PID#: BC1400
SETTING CLASSIFICATION: Concrete bridge abutment OPUS PID:
LATITUDE: 30° 18.7' N ( 30.31083) LONGITUDE: 81° 36.5' W ( -81.60889)
The primary bench mark is a disk set flush in the top of the concrete sidewalk
at the eastern end of the concrete bridge over Little Pottsburg Creek, 8.5 m
(28.0 ft) north of the centerline of the west bound lane of Atlantic Boulevard,
2.1 m (6.8 ft) west of power pole No. 5453, 1.5 m (5.0 ft) NE of the concrete
guard rail along the northerly edge of the westbound lanes of Atlantic
Boulevard, and 0.3 m (1.0 ft) south of the NE corner of the bridge.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 7
Station ID: 8720274 PUBLICATION DATE: 11/10/2010
Name: LITTLE POTTSBURG CREEK
FL
NOAA Chart: 11491 Latitude: 30° 18.6' N ( 30.31000)
USGS Quad: ARLINGTON Longitude: 81° 36.6' W ( -81.61000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 0274 B 1978
DESIGNATION: 872 0274 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 10709
AGENCY: National Ocean Survey (NOS) IDB PID#: BC1399
SETTING CLASSIFICATION: Concrete steps OPUS PID#: BC1399
LATITUDE: 30° 18.7' N ( 30.31139) LONGITUDE: 81° 36.4' W ( -81.60583)
The bench mark is a disk set flush in the top of the bottom step to St. Pauls
Episcopal Church at 5616 Atlantic Boulevard, 1.4 m (4.5 ft) south of the south
edge of the 1.5 m (5.0 ft) concrete sidewalk on the south side of Atlantic
Boulevard (a six lane highway) 0.5 m (1.8 ft) south of a 0.9 m (3.0 ft) tall
concrete retaining wall, and 3.5 m (11.5 ft) east of the south projection
centerline of Campbell Road on the north side of Atlantic Boulevard.
BENCH MARK STAMPING: NO 3 1939
DESIGNATION: 872 0274 TIDAL 3
MONUMENTATION: Tidal Station disk VM#: 10712
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: BC1398
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 30° 18.9' N ( 30.31444) LONGITUDE: 81° 36.6' W ( -81.60944)
The bench mark is a disk set in the top of a round concrete post, recessed 0.9 m
(0.3 ft) below ground level, on the edge of a bamboo thicket, 11.4 m (37.5 ft)
NE of bench mark No. 2 1939, 4.3 m (14.0 ft) SW of the centerline of the
driveway to the house at 1101 Campbell Road, 3.4 m (11.0 ft) SW of the SW corner
of the concrete pillar at the west side of the driveway to the residence, 7.3 m
(24.0 ft) SW of the SW corner of the eastern most concrete pillar, and 1.2 m
(4.0 ft) SE of the corner post of a wooden fence, and recessed 0.9 m (0.3 ft)
below ground level. NOTE: A magnet was buried at the south side of the
monument.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 7
Station ID: 8720274 PUBLICATION DATE: 11/10/2010
Name: LITTLE POTTSBURG CREEK
FL
NOAA Chart: 11491 Latitude: 30° 18.6' N ( 30.31000)
USGS Quad: ARLINGTON Longitude: 81° 36.6' W ( -81.61000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 0274 C 2004
DESIGNATION: 872 0274 C TIDAL
MONUMENTATION: Flange-encased Rod VM#: 19333
AGENCY: National Geodetic Survey (NGS) IDB PID#: DI0247
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 30° 18.6' N ( 30.31000) LONGITUDE: 81° 36.6' W ( -81.61083)
The bench mark is a flange-encased rod located 15.8 m (51.7 ft) NW of a wooden
light pole No. 1639, 15.2 m (50.0 ft) SE of the southerly edge of a 1.5 m (5.0
ft) wide concrete sidewalk along the southerly side of Atlantic Boulevard, 4.6 m
(15.0 ft) SW of the center of Brookside Circle West, 0.8 m (2.7 ft) NE of a 1.2
m (4.0 ft) high wooden fence and 0.6 m (2.0 ft) NE of a carsonite witness post.
The datum point is recessed 0.1 m (0.2 ft) below the level of the NGS logo cap,
being the top of a stainless steel rod, driven to refusal at a depth of 18.3 m
(60.0 ft) encased in a 5-inch NGS logo cap flush with the ground. NOTE: 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: 8720274 PUBLICATION DATE: 11/10/2010
Name: LITTLE POTTSBURG CREEK
FL
NOAA Chart: 11491 Latitude: 30° 18.6' N ( 30.31000)
USGS Quad: ARLINGTON Longitude: 81° 36.6' W ( -81.61000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: DUV 31 1983 BSM
DESIGNATION: DUV 31
MONUMENTATION: Bench Mark disk VM#: 19334
AGENCY: FL Department of Natural Resources
(FLDNR) IDB PID#: DI0246
SETTING CLASSIFICATION: Concrete bridge rail OPUS PID:
LATITUDE: 30° 18.3' N ( 30.30500) LONGITUDE: 81° 38.1' W ( -81.63528)
The bench mark is a disk set flush in the top of the guard rail near the NE
corner of the bridge over Beach Boulevard, 18.9 m (62.0 ft) south of the
centerline of the eastbound lane of Atlantic Boulevard, 10.0 m (32.8 ft) ESE of
the easterly bridge abutment, 5.3 m (17.5 ft) NNE of the centerline of the
westbound lane of Beach Boulevard and 0.6 m (2.1 ft) WSW of the east end of the
guardrail.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 7
Station ID: 8720274 PUBLICATION DATE: 11/10/2010
Name: LITTLE POTTSBURG CREEK
FL
NOAA Chart: 11491 Latitude: 30° 18.6' N ( 30.31000)
USGS Quad: ARLINGTON Longitude: 81° 36.6' W ( -81.61000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: DUV 32 1983 BSM
DESIGNATION: DUV 32
MONUMENTATION: Bench Mark disk VM#: 19335
AGENCY: FL Department of Natural Resources
(FLDNR) IDB PID#: DI0245
SETTING CLASSIFICATION: Concrete walkway OPUS PID:
LATITUDE: 30° 18.5' N ( 30.30833) LONGITUDE: 81° 37.2' W ( -81.61972)
The bench mark is a disk set flush in the east walkway over the north abutment
of the northbound bridge over Atlantic Boulevard, 8.4 m (27.7 ft) north of the
centerline of the northbound lanes of U.S. Alternate Highway 1, and 2.7 m (9.0
ft) south of the north end of the bridge guardrail.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 7
Station ID: 8720274 PUBLICATION DATE: 11/10/2010
Name: LITTLE POTTSBURG CREEK
FL
NOAA Chart: 11491 Latitude: 30° 18.6' N ( 30.31000)
USGS Quad: ARLINGTON Longitude: 81° 36.6' W ( -81.61000)
T I D A L D A T U M S
Tidal datums at LITTLE POTTSBURG CREEK based on:
LENGTH OF SERIES: 5 MONTHS
TIME PERIOD: July 1978 - November 1978
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 = 0.673
MEAN HIGH WATER MHW = 0.641
North American Vertical Datum NAVD88 = 0.370
MEAN TIDE LEVEL MTL = 0.333
MEAN SEA LEVEL MSL = 0.327
MEAN LOW WATER MLW = 0.024
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
0274 A 1978 4.388 3.747
0274 B 1978 6.442 5.801
NO 3 1939 2.535 1.894
0274 C 2004 6.038 5.397
DUV 31 1983 BSM 11.020 10.379
DUV 32 1983 BSM 15.147 14.506
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 0274 C 2004, DUV 31 1983 BSM, DUV
32 1983 BSM, and NO 2 1939 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: 8720274 PUBLICATION DATE: 11/10/2010
Name: LITTLE POTTSBURG CREEK
FL
NOAA Chart: 11491 Latitude: 30° 18.6' N ( 30.31000)
USGS Quad: ARLINGTON Longitude: 81° 36.6' W ( -81.61000)
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.