U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 7
Station ID: 8720774 PUBLICATION DATE: 11/01/2011
Name: PALATKA, ST. JOHNS RIVER
FL
NOAA Chart: 11492 Latitude: 29° 38.6' N ( 29.64330)
USGS Quad: PALATKA Longitude: 81° 37.9' W ( -81.63170)
To reach the tidal bench marks from City Hall, at the intersection of U.S.
Highway 17, State Road 100 (Reid Street) and 2nd Street in Palatka, go east on
U.S. Highway 17, State Road 100 (Reid Street) for 0.08 km(0.05 mi) to the
junction of First Street, turn left on First Street and go north for 0.08 km
(0.05 mi) to the north entrance of the Holiday Inn Motel on the right, turn
right and go east to the end of the parking lot. The bench marks are in this
general vicinity. The tide gage and staff is attached to a wooden dock on the
NE side of the Holiday Inn Motel.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: NO 5 1934
DESIGNATION: 872 0774 TIDAL 5
MONUMENTATION: Bench Mark disk VM#: 5252
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AQ0064
SETTING CLASSIFICATION: Concrete porch OPUS PID:
LATITUDE: 29° 38.8' N ( 29.64670) LONGITUDE: 81° 37.8' W ( -81.63000)
The primary bench mark is a disk set flush in the concrete porch of the city
hall in the SE corner of the main entrance on the west side on 2nd Street, 8.53
m (28.0 ft) east of the east curb of 2nd Street, 6.40 m (21.0 ft) south of the
center of the entrance, and 0.76 m (2.5 ft) above street level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 7
Station ID: 8720774 PUBLICATION DATE: 11/01/2011
Name: PALATKA, ST. JOHNS RIVER
FL
NOAA Chart: 11492 Latitude: 29° 38.6' N ( 29.64330)
USGS Quad: PALATKA Longitude: 81° 37.9' W ( -81.63170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: PRIM TRAV STA NO 6 1911 18.822
DESIGNATION: PTS 6
MONUMENTATION: Pipe Cap VM#: 5251
AGENCY: US Geological Survey (USGS) IDB PID#: AQ0063
SETTING CLASSIFICATION: Iron pipe OPUS PID:
LATITUDE: 29° 38.8' N ( 29.64694) LONGITUDE: 81° 38.0' W ( -81.63333)
The bench mark is a disk set on top of a 3.5-inch diameter iron pipe projecting
0.30 m (1.0 ft) above the level of the ground and 0.46 m (1.5 ft) above St.
Johns Avenue, 41.61 m (136.5 ft) SW of the SW corner of the south step of the
courthouse, 26.82 m (88.0 ft) NE of a street sign (St. Johns Avenue, 5th
Street), 6.86 m (22.5 ft) north of the north curb of St. Johns Avenue, and 2.13
m (7.0 ft) NW of a 30-inch oak tree.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 7
Station ID: 8720774 PUBLICATION DATE: 11/01/2011
Name: PALATKA, ST. JOHNS RIVER
FL
NOAA Chart: 11492 Latitude: 29° 38.6' N ( 29.64330)
USGS Quad: PALATKA Longitude: 81° 37.9' W ( -81.63170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: D 31 RESET 1968
DESIGNATION: D 31 RESET
MONUMENTATION: Bench Mark disk VM#: 5253
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AQ0069
SETTING CLASSIFICATION: Step OPUS PID:
LATITUDE: 29° 38.9' N ( 29.64830) LONGITUDE: 81° 37.8' W ( -81.63000)
The bench mark is a disk set in the bottom step of the SE corner of the entrance
to the Larimer Arts Center and 0.30 m (1.0 ft) above the level of the road,
about 32.92 m (108.0 ft) east of the centerline of 3rd Street, 13.72 m (45.0 ft)
north of the centerline of the westbound lanes of U.S. Highway 17, and 0.98 m
(3.2 ft) north of the SE hand rail of the step.
BENCH MARK STAMPING: 8 1973
DESIGNATION: 872 0774 TIDAL 8
MONUMENTATION: Tidal Station disk VM#: 5254
AGENCY: National Ocean Survey (NOS) IDB PID#: AQ1559
SETTING CLASSIFICATION: Sewer cover OPUS PID:
LATITUDE: 29° 38.7' N ( 29.64500) LONGITUDE: 81° 37.9' W ( -81.63170)
The bench mark is a disk set flush in the top of a 0.91 m (3.0 ft) diameter
concrete sewer cover, 0.09 m (0.3 ft) above the level of the ground and midway
between the driveways of the two parking areas off River Street, 12.19 m (40.0
ft) SE of the intersection of the centerline of River and Laurel Street, 7.62 m
(25.0 ft) east of the centerline of River Street and 0.61 m (2.0 ft) south of
the center of the 0.61 m (2.0 ft) round steel manhole cover.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 7
Station ID: 8720774 PUBLICATION DATE: 11/01/2011
Name: PALATKA, ST. JOHNS RIVER
FL
NOAA Chart: 11492 Latitude: 29° 38.6' N ( 29.64330)
USGS Quad: PALATKA Longitude: 81° 37.9' W ( -81.63170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: BH 0774 G
DESIGNATION: 872 0774 G TIDAL
MONUMENTATION: Survey disk VM#: 5255
AGENCY: Florida Department of Transportation
(FLDOT) IDB PID#: AC9050
SETTING CLASSIFICATION: Guardrail OPUS PID#: AC9050
LATITUDE: 29° 38.8' N ( 29.64670) LONGITUDE: 81° 37.7' W ( -81.62830)
The bench mark is a disk set flush in the top of the SW end of the guardrail of
the bridge over St. Johns River, 0.91 m (3.0 ft) above the level of the
pavement, 8.53 m (28.0 ft) south of the centerline of the southbound lane, 1.77
m (5.8 ft) east of the west end of the rail, 0.18 m (0.6 ft) west of the bridge
abutment.
BENCH MARK STAMPING: 0774 A 1995
DESIGNATION: 872 0774 A
MONUMENTATION: Tidal Station disk VM#: 17680
AGENCY: Florida Dept. of Environmental
Protection (FLDEP) IDB PID#: AC9058
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 29° 38.9' N ( 29.64830) LONGITUDE: 81° 37.6' W ( -81.62670)
The bench mark is a flange-encased rod located 48.77 m (160.0 ft) east of the
centerline of First Street, 30.60 m (100.4 ft) NE of the NE corner of the
Holiday Inn, 4.88 m (16.0 ft) west of a 24-inch palm tree, 1.28 m (4.2 ft) south
of a 1.83 m (6.0 ft) tall chainlink fence and 1.21 m (4.0 ft) south of a
carsonite witness post. The datum point is accessed through a 5-inch NOS logo
cap flush with the ground and 0.76 m (2.5 ft) below the level of Madison Street,
recessed 0.09 m (0.3 ft) below the level of the NOS logo cap containing a
magnet, being the top of a stainless steel rod, driven to refusal at a depth of
20.24 m (66.4 ft).
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 7
Station ID: 8720774 PUBLICATION DATE: 11/01/2011
Name: PALATKA, ST. JOHNS RIVER
FL
NOAA Chart: 11492 Latitude: 29° 38.6' N ( 29.64330)
USGS Quad: PALATKA Longitude: 81° 37.9' W ( -81.63170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 0774 B 1994
DESIGNATION: 872 0774 B
MONUMENTATION: Tidal Station disk VM#: 17681
AGENCY: Florida Dept. of Environmental
Protection (FLDEP) IDB PID#: AC9055
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 29° 38.9' N ( 29.64830) LONGITUDE: 81° 37.7' W ( -81.62830)
The bench mark is a flange-encased rod located 68.73 m (225.5 ft) west of the
approximate center of first street, 67.73 m (222.2 ft) east of the approximate
center of Second Street, 29.87 m (98.0 ft) east of the NE corner of the Farm
Credit of North Florida Building, 16.25 m (53.3 ft) WNW of the NW corner of the
Madison house (number 107 a two story house), 9.66 m (31.7 ft) south of the
approximate center of Madison Street (a red brick street), 4.75 m (15.6 ft) east
of a 20-inch palm tree, 0.79 m (1.6 ft) west of the north end of a chainlink
fence, and 0.30 m (1.0 ft) south of the south end of the side walk. The datum
point is accessed through a 5-inch NOS logo cap flush with the ground and 0.46 m
(1.5 ft) above the level of Madison Street, recessed 0.09 m (0.3 ft) below the
level of the NOS logo cap containing a magnet, being the top of a stainless
steel rod, driven to refusal at a depth of 11.98 m (39.3 ft).
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 7
Station ID: 8720774 PUBLICATION DATE: 11/01/2011
Name: PALATKA, ST. JOHNS RIVER
FL
NOAA Chart: 11492 Latitude: 29° 38.6' N ( 29.64330)
USGS Quad: PALATKA Longitude: 81° 37.9' W ( -81.63170)
T I D A L D A T U M S
Tidal datums at PALATKA, ST. JOHNS RIVER based on:
LENGTH OF SERIES: 1 YEAR
TIME PERIOD: October 2003 - September 2004
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8720503 RED BAY POINT, ST JOHNS RIVER
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (09/26/2004) = 1.249
MEAN HIGHER HIGH WATER MHHW = 0.426
MEAN HIGH WATER MHW = 0.415
North American Vertical Datum NAVD88 = 0.236
MEAN SEA LEVEL MSL = 0.222
MEAN TIDE LEVEL MTL = 0.222
MEAN LOW WATER MLW = 0.028
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (05/29/2004) = -0.382
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
NO 5 1934 4.819 4.404
PRIM TRAV STA NO 6 1911 18.822 5.679 5.264
D 31 RESET 1968 4.718 4.303
8 1973 2.293 1.878
BH 0774 G 4.206 3.791
0774 A 1995 1.158 0.743
0774 B 1994 3.758 3.343
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 7
Station ID: 8720774 PUBLICATION DATE: 11/01/2011
Name: PALATKA, ST. JOHNS RIVER
FL
NOAA Chart: 11492 Latitude: 29° 38.6' N ( 29.64330)
USGS Quad: PALATKA Longitude: 81° 37.9' W ( -81.63170)
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.