U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8725377 PUBLICATION DATE: 02/05/2004
Name: HENDRY CREEK, ESTERO BAY
FL
NOAA Chart: 11426 Latitude: 26° 28.2' N ( 26.47000)
USGS Quad: ESTERO Longitude: 81° 52.6' W ( -81.87670)
To reach the tidal bench marks by boat from the point where Hendry Creek flows
into Estero Bay, proceed 3.4 km (2.4 nm) NW to an area 91 m (300 ft) west of a
mangrove point where there is a fork off to the right from the main branch of
Hendry Creek. The bench marks are located on the east side of Hendry Creek and
a witness sign marks the area. The tide gage and staff were located in Hendry
Creek west of the east side of the creek.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: NO 1 1973
DESIGNATION: 872 5377 TIDAL 1
MONUMENTATION: Tidal Station disk VM#: 7310
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 26° 28.1' N ( 26.46830) LONGITUDE: 81° 52.9' W ( -81.88170)
The primary bench mark is a disk located 91 m (300 ft) west of mangrove point,
19 m (63 ft) SW of bench mark NO 2 1973, 16 m (52 ft) east of the outer mangrove
edge, 15 m (51 ft) NE of a witness sign at mangrove shoreline, 2.23 m (7.3 ft)
west of a two-trunked tree, 0.49 m (1.6 ft) south of a witness sign nailed to a
tree, and 0.27 m (0.9 ft) west of a witness post. The bench mark is 0.70 m (2.3
ft) above the ground, crimped to the top of a copper-clad steel rod driven 4.9 m
(16 ft) to refusal, and encased in a PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8725377 PUBLICATION DATE: 02/05/2004
Name: HENDRY CREEK, ESTERO BAY
FL
NOAA Chart: 11426 Latitude: 26° 28.2' N ( 26.47000)
USGS Quad: ESTERO Longitude: 81° 52.6' W ( -81.87670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 2 1973
DESIGNATION: 872 5377 TIDAL 2
MONUMENTATION: Tidal Station disk VM#: 7311
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 26° 28.1' N ( 26.46830) LONGITUDE: 81° 52.9' W ( -81.88170)
The bench mark is a disk located 28.13 m (92.3 ft) west of bench mark NO 3 1973,
19 m (63 ft) east of bench mark NO 1 1973, 2 m (7 ft) SE of the edge of the
large clearing in the mangroves, and 0.40 m (1.3 ft) west of a witness post.
The bench mark is 0.52 m (1.7 ft) above the ground, crimped to the top of a
copper-clad steel rod driven 4.9 m (16 ft) to refusal, and encased in a PVC pipe
and concrete kickblock.
BENCH MARK STAMPING: NO 3 1973
DESIGNATION: 872 5377 TIDAL 3
MONUMENTATION: Tidal Station disk VM#: 7312
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 26° 28.1' N ( 26.46830) LONGITUDE: 81° 52.9' W ( -81.88170)
The bench mark is a disk located 30 m (100 ft) east of the east side of a large
clearing in the mangroves, 28.13 m (92.3 ft) SSE of bench mark NO 2 1973, 0.79 m
(2.6 ft) west of a witness sign nailed to a tree, and 0.24 m (0.8 ft) west of a
witness post. The bench mark is level with the ground, crimped to the top of a
copper-clad steel rod driven 2.4 m (8.0 ft) refusal, and encased in a PVC pipe
and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8725377 PUBLICATION DATE: 02/05/2004
Name: HENDRY CREEK, ESTERO BAY
FL
NOAA Chart: 11426 Latitude: 26° 28.2' N ( 26.47000)
USGS Quad: ESTERO Longitude: 81° 52.6' W ( -81.87670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 4 1974
DESIGNATION: 872 5377 TIDAL 4
MONUMENTATION: Tidal Station disk VM#: 7313
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 26° 28.1' N ( 26.46830) LONGITUDE: 81° 52.9' W ( -81.88170)
The bench mark is a disk located 22 m (73 ft) west of bench mark NO 5 1974,
19.29 m (63.3 ft) SE of bench mark NO 3 1973, and 0.24 m (0.8 ft) west of a
witness post. The bench mark is 6 cm (0.2 ft) above the ground, crimped to the
top of a copper-clad steel rod driven 3.7 m (12 ft) to refusal, and encased in a
6-inch PVC pipe and concrete kickblock.
BENCH MARK STAMPING: NO 5 1974
DESIGNATION: 872 5377 TIDAL 5
MONUMENTATION: Tidal Station disk VM#: 7314
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 26° 28.1' N ( 26.46830) LONGITUDE: 81° 52.9' W ( -81.88170)
The bench mark is a disk located 26 m (85 ft) SW of the edge of mangroves on the
back side of the point, 21.88 m (71.8 ft) ENE of bench mark NO 4 1974, and 0.30
m (1.0 ft) SW of a witness post. The bench mark is 0.30 m (0.1 ft) above the
ground, crimped to the top of a copper-clad steel rod driven 2.4 m (8 ft) to
refusal, and encased in a 6-inch PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8725377 PUBLICATION DATE: 02/05/2004
Name: HENDRY CREEK, ESTERO BAY
FL
NOAA Chart: 11426 Latitude: 26° 28.2' N ( 26.47000)
USGS Quad: ESTERO Longitude: 81° 52.6' W ( -81.87670)
T I D A L D A T U M S
Tidal datums at HENDRY CREEK, ESTERO BAY based on:
LENGTH OF SERIES: 1 MONTH
TIME PERIOD: June 1973 - June 1973
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8725110 NAPLES, GULF OF MEXICO
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.628
MEAN HIGH WATER MHW = 0.537
MEAN SEA LEVEL MSL = 0.310
MEAN TIDE LEVEL MTL = 0.308
MEAN LOW WATER MLW = 0.079
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
NO 1 1973 1.236 0.699
NO 2 1973 1.078 0.541
NO 3 1973 0.641 0.104
NO 4 1974 0.702 0.165
NO 5 1974 0.682 0.145
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8725377 PUBLICATION DATE: 02/05/2004
Name: HENDRY CREEK, ESTERO BAY
FL
NOAA Chart: 11426 Latitude: 26° 28.2' N ( 26.47000)
USGS Quad: ESTERO Longitude: 81° 52.6' W ( -81.87670)
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.