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Datums Page Page 1 of 9
Station ID: 8728130 PUBLICATION DATE: 06/28/2004
Name: ST. MARKS LHTSE., APALACHEE BAY
FL
NOAA Chart: 11406 Latitude: 30° 4.7' N ( 30.07830)
USGS Quad: SPRAGUE ISLAND Longitude: 84° 10.7' W ( -84.17830)
To reach the tidal bench marks from the intersection of U.S. Highway 98 and
County Road 59 in Newport, proceed south on County Road 59 for 16.4 km (10.2 mi)
to its end at St. Marks Lighthouse. The bench marks are located in the vicinity
of the lighthouse and along County Road 59. The tide gage and staff were
located in the boat basin at the end of a canal, about 0.2 km (0.1 mi) west of
County Road 59.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: NO 9 1969
DESIGNATION: 872 8130 TIDAL 9
MONUMENTATION: Tidal Station disk VM#: 8278
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: BE2425
SETTING CLASSIFICATION: Limestone outcrop OPUS PID:
LATITUDE: 30° 4.7' N ( 30.07830) LONGITUDE: 84° 10.6' W ( -84.17670)
The primary bench mark is a disk set in the top of a limestone outcrop at the
junction of County Road 59 and a paved road leading to the boat ramp, 17.37 m
(57.0 ft) north of a cedar tree across the road, 11.58 m (38.0 ft) north of the
centerline of the paved road leading to the boat ramp, and 6 m (20 ft) south of
the approximate marsh line.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 9
Station ID: 8728130 PUBLICATION DATE: 06/28/2004
Name: ST. MARKS LHTSE., APALACHEE BAY
FL
NOAA Chart: 11406 Latitude: 30° 4.7' N ( 30.07830)
USGS Quad: SPRAGUE ISLAND Longitude: 84° 10.7' W ( -84.17830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7.096 NO 3 1933
DESIGNATION: 872 8130 TIDAL 3
MONUMENTATION: Tidal Station disk VM#: 8276
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: BE1204
SETTING CLASSIFICATION: Concrete retaining wall OPUS PID#: BE1204
LATITUDE: 30° 4.4' N ( 30.07330) LONGITUDE: 84° 10.8' W ( -84.18000)
The bench mark is a disk set in the top of a concrete retaining wall SW of St.
Marks Lighthouse, 6 m (20 ft) SW of the SW side of the base of the lighthouse,
and 0.3 m (1 ft) above the ground on the SW side of the retaining wall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 9
Station ID: 8728130 PUBLICATION DATE: 06/28/2004
Name: ST. MARKS LHTSE., APALACHEE BAY
FL
NOAA Chart: 11406 Latitude: 30° 4.7' N ( 30.07830)
USGS Quad: SPRAGUE ISLAND Longitude: 84° 10.7' W ( -84.17830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: M 282 1966
DESIGNATION: M 282 USDA
MONUMENTATION: Survey disk VM#: 8277
AGENCY: US Department of Agriculture (USDA) IDB PID#: BE1197
SETTING CLASSIFICATION: Bridge abutment OPUS PID:
LATITUDE: 30° 5.1' N ( 30.08500) LONGITUDE: 84° 10.2' W ( -84.17000)
The bench mark is a disk set in the top of the NE end of the SE concrete
abutment for a bridge over a spillway, about 1.6 km (1.0 mi) NE of the St. Marks
Lighthouse, 25.15 m (82.5 ft) SE of the centerline of County Road 59, 0.24 m
(0.8 ft) NE of the NE edge of the bridge, and about level with the highway.
BENCH MARK STAMPING: 8130 J 1976
DESIGNATION: 872 8130 J
MONUMENTATION: Tidal Station disk VM#: 8279
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 30° 4.7' N ( 30.07830) LONGITUDE: 84° 10.7' W ( -84.17830)
The bench mark is a disk set in the top of a concrete monument on the east side
of County Road 59 between the lighthouse and the driveway to the boat ramp, 5.73
m (18.8 ft) SE of the centerline of the road, 2.77 m (9.1 ft) NW of power pole
5-4080, and level with the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 9
Station ID: 8728130 PUBLICATION DATE: 06/28/2004
Name: ST. MARKS LHTSE., APALACHEE BAY
FL
NOAA Chart: 11406 Latitude: 30° 4.7' N ( 30.07830)
USGS Quad: SPRAGUE ISLAND Longitude: 84° 10.7' W ( -84.17830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8130 K 1976
DESIGNATION: 872 8130 K
MONUMENTATION: Tidal Station disk VM#: 8280
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 30° 4.7' N ( 30.07830) LONGITUDE: 84° 10.7' W ( -84.17830)
The bench mark is a disk set in the top of a concrete monument on the east side
of County Road 59 between the lighthouse and the driveway to the boat ramp, 6.37
m (20.9 ft) east of the centerline of the road, 1.62 m (5.3 ft) west of power
pole 5-4082, and level with the ground.
BENCH MARK STAMPING: 8130 L 1976
DESIGNATION: 872 8130 L
MONUMENTATION: Tidal Station disk VM#: 8281
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 30° 4.7' N ( 30.07830) LONGITUDE: 84° 10.7' W ( -84.17830)
The bench mark is a disk set in the top of a concrete monument on the east side
of County Road 59 between the lighthouse and the driveway to the boat ramp, 5.43
m (17.8 ft) SE of the centerline of the road, 3.51 m (11.5 ft) NW of power pole
5-4084, and level with the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 9
Station ID: 8728130 PUBLICATION DATE: 06/28/2004
Name: ST. MARKS LHTSE., APALACHEE BAY
FL
NOAA Chart: 11406 Latitude: 30° 4.7' N ( 30.07830)
USGS Quad: SPRAGUE ISLAND Longitude: 84° 10.7' W ( -84.17830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8130 A 1980 BSM
DESIGNATION: 872 8130 A TIDAL FLDNR
MONUMENTATION: Tidal Station disk VM#: 8282
AGENCY: Florida Department of Natural Resources
(FLDNR) IDB PID#: BE2424
SETTING CLASSIFICATION: Concrete monument OPUS PID#: BE2424
LATITUDE: 30° 4.6' N ( 30.07670) LONGITUDE: 84° 10.6' W ( -84.17670)
The bench mark is a disk set in the top of a concrete monument at the
intersection of County Road 59 and the driveway leading to the boat ramp, 35.17
m (115.4 ft) north of a power pole, 12.01 m (39.4 ft) NW of the centerline of
the road, 6.64 m (21.8 ft) SW of the centerline of the driveway, 1.10 m (3.6 ft)
SW of a stop sign, and level with the ground.
BENCH MARK STAMPING: 8130 B 1980 BSM
DESIGNATION: 872 8130 B TIDAL FLDNR
MONUMENTATION: Tidal Station disk VM#: 8283
AGENCY: Florida Department of Natural Resources
(FLDNR) IDB PID#: BE2423
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 30° 4.3' N ( 30.07170) LONGITUDE: 84° 10.8' W ( -84.18000)
The bench mark is a disk set in the top of a concrete monument in the vicinity
of the lighthouse, 6 m (20 ft) NNW of the northernmost leg of an observation
tower, 1.68 m (5.5 ft) SSE of the SE corner of a shelter, 1.37 m (4.5 ft) NE of
a cabbage palm, and level with the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 9
Station ID: 8728130 PUBLICATION DATE: 06/28/2004
Name: ST. MARKS LHTSE., APALACHEE BAY
FL
NOAA Chart: 11406 Latitude: 30° 4.7' N ( 30.07830)
USGS Quad: SPRAGUE ISLAND Longitude: 84° 10.7' W ( -84.17830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8130 C 1980 BSM
DESIGNATION: 872 8130 C TIDAL FLDNR
MONUMENTATION: Tidal Station disk VM#: 8284
AGENCY: Florida Department of Natural Resources
(FLDNR) IDB PID#: BE2421
SETTING CLASSIFICATION: Concrete base OPUS PID:
LATITUDE: 30° 4.4' N ( 30.07330) LONGITUDE: 84° 10.8' W ( -84.18000)
The bench mark is a disk set in the east corner of the concrete base for a
historical information plaque about the lighthouse, 8.08 m (26.5 ft) west of the
west corner of the brick lighthouse building, 7 m (22 ft) SSW of the SW edge of
the walkway leading to the lighthouse, and 6.25 m (20.5 ft) SE of the twin
cabbage palms.
BENCH MARK STAMPING: 8130 D 1980 BSM
DESIGNATION: 872 8130 D TIDAL FLDNR
MONUMENTATION: Tidal Station disk VM#: 8285
AGENCY: Florida Department of Natural Resources
(FLDNR) IDB PID#: BE2422
SETTING CLASSIFICATION: Concrete pad OPUS PID:
LATITUDE: 30° 4.3' N ( 30.07170) LONGITUDE: 84° 10.8' W ( -84.18000)
The bench mark is a disk set in a concrete pad at the northernmost steps to the
lighthouse building, 10.24 m (33.6 ft) ENE of a 1 m (3 ft) diameter oak tree,
4.88 m (16.0 ft) SW of the north corner of the building, and 0.3 m (1 ft) north
of the bottom step.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 9
Station ID: 8728130 PUBLICATION DATE: 06/28/2004
Name: ST. MARKS LHTSE., APALACHEE BAY
FL
NOAA Chart: 11406 Latitude: 30° 4.7' N ( 30.07830)
USGS Quad: SPRAGUE ISLAND Longitude: 84° 10.7' W ( -84.17830)
T I D A L D A T U M S
Tidal datums at ST. MARKS LHTSE., APALACHEE BAY based on:
LENGTH OF SERIES: 1 YEAR
TIME PERIOD: January 1975 - December 1975
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8727520 CEDAR KEY, GULF OF MEXICO
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (09/09/1965) = 1.883
MEAN HIGHER HIGH WATER MHHW = 1.063
MEAN HIGH WATER MHW = 0.991
MEAN TIDE LEVEL MTL = 0.590
MEAN SEA LEVEL MSL = 0.584
North American Vertical Datum NAVD88 = 0.562
MEAN LOW WATER MLW = 0.188
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (02/25/1967) = -0.983
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
NO 9 1969 2.077 1.086
7.096 NO 3 1933 2.522 1.531
M 282 1966 3.105 2.114
8130 J 1976 3.104 2.113
8130 K 1976 2.353 1.362
8130 L 1976 2.992 2.001
8130 A 1980 BSM 3.179 2.188
8130 B 1980 BSM 2.914 1.923
8130 C 1980 BSM 2.743 1.752
8130 D 1980 BSM 2.841 1.850
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 8 of 9
Station ID: 8728130 PUBLICATION DATE: 06/28/2004
Name: ST. MARKS LHTSE., APALACHEE BAY
FL
NOAA Chart: 11406 Latitude: 30° 4.7' N ( 30.07830)
USGS Quad: SPRAGUE ISLAND Longitude: 84° 10.7' W ( -84.17830)
Foot Notes:
Bench marks 8130 A 1980, B 1980, C 1980, D 1980, and M 282 1966 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: 8728130 PUBLICATION DATE: 06/28/2004
Name: ST. MARKS LHTSE., APALACHEE BAY
FL
NOAA Chart: 11406 Latitude: 30° 4.7' N ( 30.07830)
USGS Quad: SPRAGUE ISLAND Longitude: 84° 10.7' W ( -84.17830)
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.