U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
PUBLICATION DATE: 11/21/1987
Station ID: 8728130 SUPERCEDED DATE: 04/21/2003
Name: ST. MARKS LIGHTHOUSE, APALACHEE BAY
FLORIDA
NOAA Chart: 11406 Latitude: 30° 4.7' N
USGS Quad: SPRAGUE ISLAND Longitude: 84° 10.7' W
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 10.2 miles (16.4
km) 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 0.1 mile (0.2 km)
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
MONUMENTATION: Survey Disk VM#: 8278
AGENCY: PID#: BE2425
SETTING CLASSIFICATION: Rock Outcrop
The bench mark is set in the top of a limestone outcrop at the junction of
County Road 59 and a paved road leading to the boat ramp, 57 feet (17 m) north
of a cedar tree across the road, 38 feet (12 m) north of the centerline of the
paved road leading to the boat ramp, and 20 feet (6 m) south of the approximate
marsh line.
BENCH MARK STAMPING: 7.096 NO 3 1933
MONUMENTATION: Survey Disk VM#: 8276
AGENCY: PID#: BE1204
SETTING CLASSIFICATION: Concrete Retaining Wall
The bench mark is set in the top of a concrete retaining wall SW of St. Marks
Lighthouse, 20 feet (6 m) SW of the SW side, of the base of the lighthouse, and
1 foot (0.3 m) 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 2 of 6
PUBLICATION DATE: 11/21/1987
Station ID: 8728130 SUPERCEDED DATE: 04/21/2003
Name: ST. MARKS LIGHTHOUSE, APALACHEE BAY
FLORIDA
NOAA Chart: 11406 Latitude: 30° 4.7' N
USGS Quad: SPRAGUE ISLAND Longitude: 84° 10.7' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: M 282 1966
MONUMENTATION: Survey Disk VM#: 8277
AGENCY: PID#: BE1197
SETTING CLASSIFICATION: Bridge Abutment
The bench mark is set in the top of the NE end of the SE concrete abutment for a
bridge over a spillway, about 1.0 mile (1.6 km) NE of the St. Marks Lighthouse,
82.5 feet (25.1 m) SE of the centerline of County Road 59, 0.8 foot (0.2 m) NE
of the NE edge of the bridge, and about level with the highway.
BENCH MARK STAMPING: 8130 J 1976
MONUMENTATION: Survey Disk VM#: 8279
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Monument
The bench mark is 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, 18.8
feet (5.7 m) SE of the centerline of the road, 9.1 feet (2.8 m) NW of power pole
5-4080, and level with the ground.
BENCH MARK STAMPING: 8130 K 1976
MONUMENTATION: Survey Disk VM#: 8280
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Monument
The bench mark is 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, 20.9
feet (6.4 m) east of the centerline of the road, 5.3 feet (1.6 m) west of power
pole 5-4082, and level with the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
PUBLICATION DATE: 11/21/1987
Station ID: 8728130 SUPERCEDED DATE: 04/21/2003
Name: ST. MARKS LIGHTHOUSE, APALACHEE BAY
FLORIDA
NOAA Chart: 11406 Latitude: 30° 4.7' N
USGS Quad: SPRAGUE ISLAND Longitude: 84° 10.7' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8130 L 1976
MONUMENTATION: Survey Disk VM#: 8281
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Monument
The bench mark is 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, 17.8
feet (5.4 m) SE of the centerline of the road, 11.5 feet (3.5 m) NW of power
pole 5-4084, and level with the ground.
BENCH MARK STAMPING: 8130 A 1980 BSM
MONUMENTATION: Survey Disk VM#: 8282
AGENCY: PID#: BE2424
SETTING CLASSIFICATION: Concrete Monument
The bench mark is set in the top of a concrete monument at the intersection of
County Road 59 and the driveway leading to the boat ramp, 115.4 feet (35.2 m)
north of a power pole, 39.4 feet (12.0 m) NW of the centerline of the road, 21.8
feet (6.6 m) SW of the centerline of the driveway, 3.6 feet (1.1 m) SW of a stop
sign, and level with the ground.
BENCH MARK STAMPING: 8130 B 1980 BSM
MONUMENTATION: Survey Disk VM#: 8283
AGENCY: PID#: BE2423
SETTING CLASSIFICATION: Concrete Monument
The bench mark is set in the top of a concrete monument in the vicinity of the
lighthouse, 20.1 feet (6.1 m) NNW of the northernmost leg of an observation
tower, 5.5 feet (1.7 m) SSE of the SE corner of a shelter, 4.5 feet (1.4 m) NE
of a cabbage palm, and level with the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
PUBLICATION DATE: 11/21/1987
Station ID: 8728130 SUPERCEDED DATE: 04/21/2003
Name: ST. MARKS LIGHTHOUSE, APALACHEE BAY
FLORIDA
NOAA Chart: 11406 Latitude: 30° 4.7' N
USGS Quad: SPRAGUE ISLAND Longitude: 84° 10.7' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8130 C 1980 BSM
MONUMENTATION: Survey Disk VM#: 8284
AGENCY: PID#: BE2421
SETTING CLASSIFICATION: Concrete Base
The bench mark is set in the east corner of the concrete base for a historical
information plaque about the lighthouse, 26.5 feet (8.1 m) west of the west
corner of the brick lighthouse building, 22 feet (7 m) SSW of the SW edge of the
walkway leading to the lighthouse, and 20.5 feet (6.2 m) SE of the twin cabbage
palms.
BENCH MARK STAMPING: 8130 D 1980 BSM
MONUMENTATION: Survey Disk VM#: 8285
AGENCY: PID#: BE2422
SETTING CLASSIFICATION: Concrete Pad
The bench mark is set in a concrete pad at the northernmost steps to the
lighthouse building, 33.6 feet (10.2 m) ENE of a 3-foot (1 m) diameter oak tree,
16 feet (5 m) SW of the north corner of the building, and 1 foot (0.3 m) north
of the bottom step.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
PUBLICATION DATE: 11/21/1987
Station ID: 8728130 SUPERCEDED DATE: 04/21/2003
Name: ST. MARKS LIGHTHOUSE, APALACHEE BAY
FLORIDA
NOAA Chart: 11406 Latitude: 30° 4.7' N
USGS Quad: SPRAGUE ISLAND Longitude: 84° 10.7' W
T I D A L D A T U M S
Tidal datums at ST. MARKS LIGHTHOUSE, APALACHEE BAY based on:
LENGTH OF SERIES: 5 YEARS
TIME PERIOD: 1966-1972
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8727520 CEDAR KEY
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (09/09/1965) = 6.60
MEAN HIGHER HIGH WATER MHHW = 3.49
MEAN HIGH WATER MHW = 3.23
MEAN TIDE LEVEL MTL = 1.94
* NATIONAL GEODETIC VERTICAL DATUM NGVD29 = 1.57
MEAN LOW WATER MLW = 0.65
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (02/25/1967) = -2.80
* NGVD reference based on elevations published in Quad 300842, 1973, and NOS
leveling of 1981.
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
NO 9 1969 7.20 3.97
7.096 NO 3 1933 8.66 5.43
M 282 1966 10.57 7.34
8130 J 1976 10.57 7.34
8130 K 1976 8.10 4.87
8130 L 1976 10.20 6.97
8130 A 1980 BSM 10.81 7.58
8130 B 1980 BSM 9.95 6.72
8130 C 1980 BSM 9.38 6.15
8130 D 1980 BSM 9.71 6.48
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
PUBLICATION DATE: 11/21/1987
Station ID: 8728130 SUPERCEDED DATE: 04/21/2003
Name: ST. MARKS LIGHTHOUSE, APALACHEE BAY
FLORIDA
NOAA Chart: 11406 Latitude: 30° 4.7' N
USGS Quad: SPRAGUE ISLAND Longitude: 84° 10.7' W
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 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.