U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 8
Station ID: 8725283 PUBLICATION DATE: 12/19/2023
Name: LITTLE HICKORY IS., ESTERO B.
NOAA Chart: US 4FL1KT Latitude: 26° 21.2' N ( 26.35330)
USGS Quad: BONITA Longitude: 81° 51.3' W ( -81.85500)
THE STATION IS LOCATED ABOUT 8.5 MI (13.8 KM) SOUTHEAST OF FORT MYERS BEACH, 6.3
MI (10.1 KM) SOUTH-SOUTHWEST OF ESTERO AND 5.0 MI (8.1 KM) WEST-NORTHWEST OF
BONITA SPRINGS. TO REACH FROM THE INTERSECTION OF SOUTH TAMIAMI TRAIL (US 41)
AND BONITA BEACH ROAD IN BONITA SPRINGS, GO WEST ON BONITA BEACH ROAD (COUNTY
ROAD 865) FOR 2.3 MI (3.7 KM) TO THE JUNCTION OF BAREFOOT BEACH BOULEVARD,
CONTINUE WEST THEN NORTH ON HICKORY BOULEVARD (BONITA BEACH ROAD TURNS INTO
HICKORY BOULEVARD) FOR 2.21 MI (3.56 KM) TO THE STATION ON THE RIGHT, PROCEED
NORTHEAST THROUGH THE PARKING LOT OF BIG HICKORY WATERFRONT GRILLE TO A DOCK,
THE STATION IS AN AQUATRAK TIDE GAUGE MOUNTED ON A WOOD DOCK PILE. IT IS 75.70
FT (23.1 M) NORTHEAST OF THE CORNER OF A SEAWALL, 20.00 FT (6.1 M) NORTHWEST OF
THE SOUTHEAST END OF THE DOCK, AND 17.50 FT (5.3 M) SOUTHEAST OF THE NORTHWEST
END OF THE DOCK. BENCHMARKS ARE LOCATED IN THE VICINITY NORTHWEST, WEST AND
SOUTH OF THE GAUGE ALONG COUNTY ROAD 865.
T I D A L B E N C H M A R K S
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 8
Station ID: 8725283 PUBLICATION DATE: 12/19/2023
Name: LITTLE HICKORY IS., ESTERO B.
NOAA Chart: US 4FL1KT Latitude: 26° 21.2' N ( 26.35330)
USGS Quad: BONITA Longitude: 81° 51.3' W ( -81.85500)
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: L 246 1965
DESIGNATION: L 246
MONUMENTATION: Bench Mark disk VM#: 24639
AGENCY: US Coast and Geodertic Survey
(USC&GS) IDB PID#:
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 26° 21.3' N ( 26.35456) LONGITUDE: 81° 51.4' W ( -81.85614)
The bench mark is a disk set 13.2 m (43.3 ft) ENE of the centerline of Hickory
Boulevard, 2.3 m (7.7 ft) ENE of the east side of the sidewalk, 0.27 m (0.9 ft)
WSW of a carsonite witness post and 0.2 m (0.7 ft) SSE of a round cable box
number 20019. The bench mark is set 0.3 m (1 ft) below grade, crimped to the top
of a copper coated steel rod driven 6.4 m (21 ft) to refusal and encased in a
5-inch PVC pipe.
BENCH MARK STAMPING: NO 3 1965
DESIGNATION: 872 5283 TIDAL 3
MONUMENTATION: Bench Mark disk VM#: 7875
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#:
SETTING CLASSIFICATION: Concrete sea wall OPUS PID:
LATITUDE: 26° 21.5' N ( 26.35908) LONGITUDE: 81° 51.5' W ( -81.85825)
The bench mark is a disk set in the top of the south end of the sea wall
directly under the south end of the highway bridge, 27.2 m (89.4 ft) SE of the
SE corner of the state road 865 bridge over Big Hickory Pass, 12.2 m (40 ft) SW
of the centerline of Estero boulevard, 5.8 m (19 ft) SE of the south end of a
guard rail, 0.5 m (1.5 ft) NW of a carsonite witness post, and 0.6 m (2 ft)
below ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 8
Station ID: 8725283 PUBLICATION DATE: 12/19/2023
Name: LITTLE HICKORY IS., ESTERO B.
NOAA Chart: US 4FL1KT Latitude: 26° 21.2' N ( 26.35330)
USGS Quad: BONITA Longitude: 81° 51.3' W ( -81.85500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 4 1965
DESIGNATION: 872 5283 TIDAL 4
MONUMENTATION: Bench Mark disk VM#: 7876
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#:
SETTING CLASSIFICATION: Walkway OPUS PID#: AD1311
LATITUDE: 26° 21.6' N ( 26.35936) LONGITUDE: 81° 51.5' W ( -81.85822)
The bench mark is a disk set in the top of the south end of the west concrete
base for the inside guard rail of the bridge over Big Hickory Pass, 4 m (14 ft)
west of the centerline of the highway, 1 m (4 ft) east of the westernmost
banister of the bridge, 0.30 m (1.0 ft) north of the south end of the base, and
0.30 m (1.0 ft) above the level of the bridge floor.
BENCH MARK STAMPING: D 248 1965
DESIGNATION: 872 5283 D 248
MONUMENTATION: Bench Mark disk VM#: 7877
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#:
SETTING CLASSIFICATION: Curb OPUS PID#: AD1312
LATITUDE: 26° 21.6' N ( 26.36078) LONGITUDE: 81° 51.5' W ( -81.85768)
The bench mark is a disk set in the top of the north end of the east concrete
guard rail base to the bridge over Big Hickory Pass, 4.11 m (13.5 ft) east of
the centerline of the bridge, directly over the north abutment of the bridge,
and 0.30 m (1.0 ft) above the level of the bridge floor.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 8
Station ID: 8725283 PUBLICATION DATE: 12/19/2023
Name: LITTLE HICKORY IS., ESTERO B.
NOAA Chart: US 4FL1KT Latitude: 26° 21.2' N ( 26.35330)
USGS Quad: BONITA Longitude: 81° 51.3' W ( -81.85500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5283 E
DESIGNATION: 872 5283 E
MONUMENTATION: Survey disk VM#: 7878
AGENCY: Florida State Road Department (FLSRD) IDB PID#:
SETTING CLASSIFICATION: Concrete bridge walkway OPUS PID#: AD1312
LATITUDE: 26° 21.6' N ( 26.35944) LONGITUDE: 81° 51.5' W ( -81.85811)
The bench mark is a disk set in the walkway of the bridge, 14 m (47 ft) NE of
the SW end of the bridge, 6 m (19 ft) SE of the centerline of the highway, and
0.46 m (1.5 ft) NW of the concrete railing.
BENCH MARK STAMPING: 5283 F
DESIGNATION: 872 5283 F
MONUMENTATION: Survey disk VM#: 7879
AGENCY: Florida State Road Department (FLSRD) IDB PID#:
SETTING CLASSIFICATION: Concrete bridge walkway OPUS PID#: AD7869
LATITUDE: 26° 21.6' N ( 26.35972) LONGITUDE: 81° 51.5' W ( -81.85814)
The bench mark is a disk set in the walkway of the bridge, 46 m (150 ft) NE of
the SW end of the bridge, 6 m (19 ft) NW of the centerline of the highway, and
0.46 m (1.5 ft) SE of the concrete railing.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 8
Station ID: 8725283 PUBLICATION DATE: 12/19/2023
Name: LITTLE HICKORY IS., ESTERO B.
NOAA Chart: US 4FL1KT Latitude: 26° 21.2' N ( 26.35330)
USGS Quad: BONITA Longitude: 81° 51.3' W ( -81.85500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5283 G 2022
DESIGNATION: 872 5283 G
MONUMENTATION: Flange-encased Rod VM#: 24637
AGENCY: Florida Department of Environmental
Protection IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID#: BBHT62
LATITUDE: 26° 21.5' N ( 26.35814) LONGITUDE: 81° 51.5' W ( -81.85814)
The bench mark is a flange encased rod set 11.3 m (37 ft) NE of the centerline
of Hickory Boulevard, 7.8 m (25.7 ft) NW of a fiber optic marker post, and 3.5 m
(11.5 ft) NE of a sewer manhole cover. The datum point is set 12 cm (0.4 ft)
below ground, being the top of a stainless steel rod driven 6.4 m (21.2 ft) to
refusal and encased in a 5-inch Florida Department of Environmental Protection
Agency logo cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 8
Station ID: 8725283 PUBLICATION DATE: 12/19/2023
Name: LITTLE HICKORY IS., ESTERO B.
NOAA Chart: US 4FL1KT Latitude: 26° 21.2' N ( 26.35330)
USGS Quad: BONITA Longitude: 81° 51.3' W ( -81.85500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: Z 718 2008
DESIGNATION: Z 718
MONUMENTATION: Flange-encased Rod VM#: 24640
AGENCY: National Geodetic Survey (NGS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID#: DN3721
LATITUDE: 26° 21.7' N ( 26.36111) LONGITUDE: 81° 51.5' W ( -81.85778)
The bench mark is a flange encased rod set 13.6 m (44.7 ft) WNW of the
centerline of Hickory Boulevard, 8.5 m (28.0 ft) south of a concrete power pole,
7.4 m (24.3 ft) NW of the north end of the metal guard rail, and 0.7 m (2.4 ft)
ESE of a carsonite witness post. The datum point is set 18 cm (0.6 ft) below
ground, being the top of a stainless steel rod driven 13.3 m (43.5 ft), and
encased in a 5-inch NGS logo cap.
BENCH MARK STAMPING: 12 83 A48 REF MK 2
DESIGNATION: 12 83 A48 RM 2
MONUMENTATION: Survey disk VM#: 24641
AGENCY: Florida Department of Natural ResourcesIDB PID#:
SETTING CLASSIFICATION: Set in concrete OPUS PID:
LATITUDE: 26° 20.7' N ( 26.34442) LONGITUDE: 81° 51.1' W ( -81.85111)
The bench mark is a disk set in the top of a round concrete monument located
21.9 m (72 ft) south of the extended centerline of McLaughlin Boulevard, 20.4 m
(67 ft) south of the approximate centerline of a beach access area, 14.8 m (48.5
ft) west of the centerline of Hickory Boulevard, 0.3 m (1 ft) east of a 4 ft
tall chain link fence and 0.27 m (0.9 ft) east of a carsonite witness post, and
3 cm (0.1 ft) below ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 8
Station ID: 8725283 PUBLICATION DATE: 12/19/2023
Name: LITTLE HICKORY IS., ESTERO B.
NOAA Chart: US 4FL1KT Latitude: 26° 21.2' N ( 26.35330)
USGS Quad: BONITA Longitude: 81° 51.3' W ( -81.85500)
T I D A L D A T U M S
Tidal datums at LITTLE HICKORY IS., ESTERO B. based on:
LENGTH OF SERIES: 4 MONTHS
TIME PERIOD: May 2022 - August 2022
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 = 0.739
MEAN HIGH WATER MHW = 0.654
North American Vertical Datum NAVD88 = 0.552
MEAN SEA LEVEL MSL = 0.400
MEAN TIDE LEVEL MTL = 0.395
MEAN LOW WATER MLW = 0.134
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
L 246 1965 1.639 0.985
NO 3 1965 1.411 0.757
NO 4 1965 4.581 3.927
D 248 1965 4.195 3.541
5283 E 4.053 3.399
5283 F 5.016 4.362
5283 G 2022 1.586 0.932
Z 718 2008 1.903 1.249
12 83 A48 REF MK 2 1.472 0.818
Foot Notes:
Bench marks 12 83 A48 REF MK 2, D 248 1965, and Z 718 2008 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 8 of 8
Station ID: 8725283 PUBLICATION DATE: 12/19/2023
Name: LITTLE HICKORY IS., ESTERO B.
NOAA Chart: US 4FL1KT Latitude: 26° 21.2' N ( 26.35330)
USGS Quad: BONITA Longitude: 81° 51.3' W ( -81.85500)
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.