U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
PUBLICATION DATE: 11/04/1995
Station ID: 8725393 SUPERCEDED DATE: 04/21/2003
Name: ST. JAMES CITY, PINE ISLAND, PINE ISLAND SOUND
FLORIDA
NOAA Chart: 11426 Latitude: 26° 29.5' N
USGS Quad: SANIBEL Longitude: 82° 4.9' W
To reach the tidal bench marks from the intersection of State Highway S-767
(Oleander Street) and First Avenue in St. James City, proceed north on Highway
S-767 a short distance to the Sea Bell Fish Camp on the west side of the
highway. The bench marks are located north along Highway S-767. The tide gage
and staff were located at the fish camp on a north/south canal.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: SJC 2 1965
MONUMENTATION: Survey Disk VM#: 7326
AGENCY: PID#: AG1751
SETTING CLASSIFICATION: Concrete Sea Wall
The bench mark is set in a concrete sea wall about 300 feet (91 m) north of
Bench Mark SJC 1 1965, 99 feet (30 m) west of the centerline of State Highway
S-767, 28 feet (9 m) WSW of the SW corner of a green block garage, 10 feet (3
m) north of the north rail of a marine railway, and 1 foot (0.3 m) NE of the SW
corner of the sea wall.
BENCH MARK STAMPING: SJC 1 1965
MONUMENTATION: Survey Disk VM#: 7325
AGENCY: PID#: AG1752
SETTING CLASSIFICATION: Concrete Monument
The bench mark is set in a concrete monument, 98 feet (30 m) NW of the
intersection of First Avenue and State Highway S-767, 96 feet (29 m) SSE of a
boat hoist, 52 feet (16 m) west of the centerline of State Highway S-767, 2.5
feet (0.8 m) east of the NE corner of the Sea Bell Fish Camp, and 0.4 foot (0.1
m) above ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
PUBLICATION DATE: 11/04/1995
Station ID: 8725393 SUPERCEDED DATE: 04/21/2003
Name: ST. JAMES CITY, PINE ISLAND, PINE ISLAND SOUND
FLORIDA
NOAA Chart: 11426 Latitude: 26° 29.5' N
USGS Quad: SANIBEL Longitude: 82° 4.9' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: SJC 3 1965
MONUMENTATION: Survey Disk VM#: 7327
AGENCY: PID#: AG1749
SETTING CLASSIFICATION: Concrete Head Wall
The bench mark is set in top of the west end of the north concrete head wall of
a 1-foot pipe culvert under a driveway leading to a concrete block house, 0.1
mile (0.2 km) south on Date Street from is intersection with Fourth Avenue and
across a canal from Highway S-767, 27.5 feet (8.4 m) east of the front steps of
the concrete block house, 24.0 feet (7.3 m) west of the centerline of Date
Street, 10.0 feet (3.0 m) north of the centerline of the driveway, and 1.0 foot
(0.3 m) east of the west end of the head wall.
BENCH MARK STAMPING: SJC 5 1971
MONUMENTATION: Survey Disk VM#: 7328
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Bulkhead
The bench mark is set flush in the top of a concrete bulkhead which borders the
turn of a canal running parallel with the main road, 500 feet (152 m) SE of
Bench Mark SJC 2 1965, 200 feet (61 m) NE of Bench Mark SJC 1 1965, and 120 feet
(37 m) west of the centerline of State Highway S-767.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
PUBLICATION DATE: 11/04/1995
Station ID: 8725393 SUPERCEDED DATE: 04/21/2003
Name: ST. JAMES CITY, PINE ISLAND, PINE ISLAND SOUND
FLORIDA
NOAA Chart: 11426 Latitude: 26° 29.5' N
USGS Quad: SANIBEL Longitude: 82° 4.9' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: A 260 1966
MONUMENTATION: Survey Disk VM#: 7329
AGENCY: PID#: AG1688
SETTING CLASSIFICATION: Concrete Monument
The bench mark is set in a concrete monument 1.85 miles (2.98 km) north along
State Highway S-767 from its intersection with First Avenue, 124 feet (38 m)
south of the centerline of a road leading east, 42.5 feet (13.0 m) east of the
centerline of the highway, 2 feet (1 m) north of a utility pole, 1.5 feet (0.5
m) south of a metal witness post, and 0.3 foot (0.1 m) above ground level.
BENCH MARK STAMPING: B 260
MONUMENTATION: Survey Disk VM#: 7330
AGENCY: PID#: AG1687
SETTING CLASSIFICATION: Concrete Head Wall
The bench mark is set in the top center of the east concrete head wall of a
double concrete pipe culvert under State Highway S-767, 0.4 mile (0.6 km) north
of a wooden bridge over a canal, 0.15 mile (0.24 km) south of Bench Mark A 260
1966, 18.5 feet (5.6 m) east of the centerline of the highway, and about level
with the highway.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
PUBLICATION DATE: 11/04/1995
Station ID: 8725393 SUPERCEDED DATE: 04/21/2003
Name: ST. JAMES CITY, PINE ISLAND, PINE ISLAND SOUND
FLORIDA
NOAA Chart: 11426 Latitude: 26° 29.5' N
USGS Quad: SANIBEL Longitude: 82° 4.9' W
T I D A L D A T U M S
Tidal datums at ST. JAMES CITY, PINE ISLAND, PINE ISLAND SOUND based on:
LENGTH OF SERIES: 7 MONTHS
TIME PERIOD: NOVEMBER 1965 - MAY 1966
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8725110 NAPLES
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (10/22/1965) = 3.23
MEAN HIGHER HIGH WATER MHHW = 2.24
MEAN HIGH WATER MHW = 1.97
MEAN TIDE LEVEL MTL = 1.20
* NATIONAL GEODETIC VERTICAL DATUM NGVD29 = 0.72
MEAN LOW WATER MLW = 0.43
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (02/05/1966) = -1.40
* NGVD reference based on elevations published in Quad 290821,, 1969, and NOS
leveling of 1971.
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
SJC 2 1965 4.01 2.04
SJC 1 1965 5.65 3.68
SJC 3 1965 5.59 3.62
SJC 5 1971 4.29 2.32
A 260 1966 4.73 2.76
B 260 5.99 4.02
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
PUBLICATION DATE: 11/04/1995
Station ID: 8725393 SUPERCEDED DATE: 04/21/2003
Name: ST. JAMES CITY, PINE ISLAND, PINE ISLAND SOUND
FLORIDA
NOAA Chart: 11426 Latitude: 26° 29.5' N
USGS Quad: SANIBEL Longitude: 82° 4.9' 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.