U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 7
Station ID: 8725110 PUBLICATION DATE: 02/08/2018
Name: NAPLES, GULF OF MEXICO
FL
NOAA Chart: 11429 Latitude: 26° 7.9' N ( 26.13167)
USGS Quad: NAPLES NORTH Longitude: 81° 48.4' W ( -81.80747)
To reach the tidal bench marks from the intersection of U.S. Highway 41 and 5th
Avenue South in Naples, proceed west on 5th Avenue South for 1.1 km (0.7 mi) to
Gulf Shore Boulevard South, go south on Gulf Shore Boulevard South for 1.0 km
(0.6 mi) to 12th Avenue South. The bench marks are located along 12th Avenue
South, Gordon Drive, and 3rd Street South. The tide gage and staff are located
about half way out on the municipal pier at the end of 12th Avenue South.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 5110 E 1984
DESIGNATION: 872 5110 E
MONUMENTATION: Tidal Station disk VM#: 729
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 26° 8.1' N ( 26.13442) LONGITUDE: 81° 48.1' W ( -81.80236)
The primary bench mark is a disk located 141.0 m (462.6 ft) north of the
centerline intersection of Broad Avenue and 3rd Street South, 134 m (439.6 ft)
east of the centerline of the intersection of Gordon Drive and 11th Avenue
South, 24.65 m (80.87 ft) SW from the SW corner of the South Beach Club
apartment building, 12.45 m (40.85 ft) north of the centerline intersection of
11th Avenue South, 7.50 m (24.61 ft) west of the centerline of 3rd Street, and
0.73 m (2.40 ft ) east of the east edge of the sidewalk. The bench mark is set
0.09 m (0.29 ft) (9 cm) below ground level, crimped to a stainless steel rod
driven 19.5 m (64.0 ft) to refusal, and encased in a 4-inch PVC pipe and
concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 7
Station ID: 8725110 PUBLICATION DATE: 02/08/2018
Name: NAPLES, GULF OF MEXICO
FL
NOAA Chart: 11429 Latitude: 26° 7.9' N ( 26.13167)
USGS Quad: NAPLES NORTH Longitude: 81° 48.4' W ( -81.80747)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: T 241 1965
DESIGNATION: T 241
MONUMENTATION: Bench Mark disk VM#: 721
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AD1259
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 26° 8.3' N ( 26.13794) LONGITUDE: 81° 48.0' W ( -81.79964)
The bench mark is a disk located in the middle of a sidewalk , 32.20m (105.64
ft) east of a telephone pole with transformer (no. 63810719), 30.15m (98.92 ft)
west of power pole no 6281120, 10.73m (35.20 ft) east of a flagpole, 10.50m
(34.45 ft) south of the centerline of the avenue and 0.40 m (1.31 ft) below
ground level, crimped to a copper-clad steel rod driven 26.8 m (87.9 ft) to
refusal and encased in 5 in. pvc and alum. Note - Access cover.
BENCH MARK STAMPING: NO 5 1967
DESIGNATION: 872 5110 TIDAL 5
MONUMENTATION: Tidal Station disk VM#: 722
AGENCY: National Ocean Survey (NOS) IDB PID#: AD5734
SETTING CLASSIFICATION: Concrete apron OPUS PID:
LATITUDE: 26° 7.9' N ( 26.13111) LONGITUDE: 81° 48.2' W ( -81.80389)
The bench mark is a disk set flush in the top of the concrete apron around the
swimming pool at the mariner apartments motel, 1295 Gulf Shore blvd south, 5.39
m (17.68 ft) south of the center of an alley, 2.90 m (9.51 ft) NW of the NW
corner of the pool, 0.79 m (2.59 ft) east of the corner of the building, 0.61 m
(2.00 ft) SE of the NE corner of a sidewalk surrounding the pool, 0.40 m (1.31
ft) south of a chain link fence, and 0.30 m (0.98 ft) above the level of the
alley.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 7
Station ID: 8725110 PUBLICATION DATE: 02/08/2018
Name: NAPLES, GULF OF MEXICO
FL
NOAA Chart: 11429 Latitude: 26° 7.9' N ( 26.13167)
USGS Quad: NAPLES NORTH Longitude: 81° 48.4' W ( -81.80747)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 6 1971
DESIGNATION: 872 5110 TIDAL 6
MONUMENTATION: Tidal Station disk VM#: 723
AGENCY: National Ocean Survey (NOS) IDB PID#: AD5733
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 26° 7.9' N ( 26.13139) LONGITUDE: 81° 48.2' W ( -81.80389)
The bench mark is a disk set flush in the top of the Easternmost of the two
abandoned tower supports, between the SE corner of the municipal parking lot and
1295 Gulf Shore Blvd, 9.30 m (30.51 ft) NNW of the NE corner of the Mariner
Apartments Hotel, 3.60 m (11.81 ft) north of and level with the center of the
alley, 1.75 m (5.74 ft) south of the SE curb of a parking lot, 0.45 m (1.48 ft)
west of a witness post, 0.35 m (1.15 ft) NW of underground telephone cable
junction box number 1023, and at ground level.
BENCH MARK STAMPING: NO 8 1974
DESIGNATION: 872 5110 TIDAL 8
MONUMENTATION: Tidal Station disk VM#: 724
AGENCY: National Ocean Survey (NOS) IDB PID#: AD5732
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 26° 7.9' N ( 26.13172) LONGITUDE: 81° 48.3' W ( -81.80458)
The bench mark is a disk located at the intersection of Gulf Shore Boulevard
south and 12th ave south, set in a concrete-filled terra cotta pipe, 11.00 m
(36.09 ft) south of the centerline of 12th avenue, 9.85 m (32.32 ft) east of the
centerline of gulf shore boulvard, 1.45 m (4.76 ft) NW of the NW corner of a
municipal parking lot, 1.01 m (3.31 ft) north of a palm tree, and 0.30 m (0.98
ft) below ground level inside a PVC pipe and logo cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 7
Station ID: 8725110 PUBLICATION DATE: 02/08/2018
Name: NAPLES, GULF OF MEXICO
FL
NOAA Chart: 11429 Latitude: 26° 7.9' N ( 26.13167)
USGS Quad: NAPLES NORTH Longitude: 81° 48.4' W ( -81.80747)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5110 A 1978
DESIGNATION: 872 5110 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 725
AGENCY: National Ocean Survey (NOS) IDB PID#: AD6338
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 26° 7.9' N ( 26.13097) LONGITUDE: 81° 48.2' W ( -81.80306)
The primary bench mark is a disk located at the intersection of Gordon Drive and
13th Avenue South, 16.49 m (54.10 ft) north of the centerline of the avenue,
10.79 m (35.40 ft) east of the centerline of the drive, 11.40 m (37.40 ft) ENE
of the center of manhole, 0.69 m (2.26 ft) east of the centerline of a palm
tree, and 0.30 m (0.98 ft) above the level of the drive. The bench mark is
crimped to a stainless steel rod driven 11.0 m (36.1 ft) to refusal, and encased
in a 4-inch pvc pipe and logo cap.
BENCH MARK STAMPING: 5110 F 2004
DESIGNATION: 872 5110 F TIDAL
MONUMENTATION: Tidal Station disk VM#: 17598
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete Drainage Culvert OPUS PID:
LATITUDE: 26° 8.1' N ( 26.13558) LONGITUDE: 81° 48.1' W ( -81.80169)
The bench mark is a disk set in the top of a 2.63 m X 1.23 m (8.63 ft X 4.04 ft
) concrete drainage culvert, 27.4 m (89.9 ft) NNE of the NE corner of the town
manor club building, 25.85 m (84.81 ft) SE of the SE corner of St. Ann's Parish
Hall, 4.90 m (16.08 ft) north of the cenerline of 10th Avenue south, 0.15 m
(0.49 ft ) east of the west edge of a concrete drainage culvert, 0.15 m (0.49 ft
) north of the south edge of a concrete drainage culvert.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 7
Station ID: 8725110 PUBLICATION DATE: 02/08/2018
Name: NAPLES, GULF OF MEXICO
FL
NOAA Chart: 11429 Latitude: 26° 7.9' N ( 26.13167)
USGS Quad: NAPLES NORTH Longitude: 81° 48.4' W ( -81.80747)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5110 G 2004
DESIGNATION: 872 5110 G TIDAL
MONUMENTATION: Tidal Station disk VM#: 17599
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete Drainage Culvert OPUS PID:
LATITUDE: 26° 8.1' N ( 26.13569) LONGITUDE: 81° 48.1' W ( -81.80106)
The bench mark is a disk set flush in the top of a 1.77 m X 1.22 m (5.81 ft X
4.00 ft) concrete drainage culvert, 29.3 m (96.1 ft) SW of the SW corner of the
house 415 Holly Lee, 16.1 m (52.8 ft) NNW of the telephone pole no. 63810003,
8.41 m (27.59 ft) west of the centerline of 4th Street South, 6.16 m (20.21ft)
north of the centerline of 10th Avenue South, 0.16 m (0.52 ft) west of the east
edge of a concrete drainage culvert, 0.16 m (0.52 ft) south of the north edge of
a concrete drainage culvert.
BENCH MARK STAMPING: 5110 J 2008
DESIGNATION: 872 5110 J
MONUMENTATION: Metal Rod VM#: 21325
AGENCY: National Ocean Service (NOS) IDB PID#: DN3777
SETTING CLASSIFICATION: Stainless Steel rod OPUS PID:
LATITUDE: 26° 7.8' N ( 26.13058) LONGITUDE: 81° 48.3' W ( -81.80561)
The bench mark is located at the west end of 13th Avenue South, 19.2 m (63.0 ft)
SE of a green light pole at the beach access, 15.1 m (49.5 ft) west of the
western most driveway of 76 13th Avenue South, 2.4 m (7.9 ft) north of a 1.5 m
(4.9 ft) concrete wall, 1.06 m (3.5 ft) south of the southern curb of the beach
access parking lot, 0.52 m (1.7 ft) north of a witness post. The bench mark is
a stainless steel rod driven to refusal, and encased in a 5-inch pvc pipe and
logo cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 7
Station ID: 8725110 PUBLICATION DATE: 02/08/2018
Name: NAPLES, GULF OF MEXICO
FL
NOAA Chart: 11429 Latitude: 26° 7.9' N ( 26.13167)
USGS Quad: NAPLES NORTH Longitude: 81° 48.4' W ( -81.80747)
T I D A L D A T U M S
Tidal datums at NAPLES, GULF OF MEXICO based on:
LENGTH OF SERIES: 17 YEARS
TIME PERIOD: 1/1983-12/1986 ; 1/1989-12/2001
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION:
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (09/10/2017) = 2.099
MEAN HIGHER HIGH WATER MHHW = 0.874
MEAN HIGH WATER MHW = 0.797
North American Vertical Datum NAVD88 = 0.690
MEAN SEA LEVEL MSL = 0.502
MEAN TIDE LEVEL MTL = 0.491
MEAN LOW WATER MLW = 0.184
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (08/24/1992) = -0.885
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
5110 E 1984 2.111 1.314
T 241 1965 1.476 0.679
NO 5 1967 2.157 1.360
NO 6 1971 2.007 1.210
NO 8 1974 2.457 1.660
5110 A 1978 1.955 1.158
5110 F 2004 2.321 1.524
5110 G 2004 2.248 1.451
5110 J 2008 2.968 2.171
Foot Notes:
Bench mark 5110 J 2008 is based on one differential leveling connection and does
not meet the quality control standards of the NOS. Therefore, caution should be
used when deriving elevations for this mark.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 7
Station ID: 8725110 PUBLICATION DATE: 02/08/2018
Name: NAPLES, GULF OF MEXICO
FL
NOAA Chart: 11429 Latitude: 26° 7.9' N ( 26.13167)
USGS Quad: NAPLES NORTH Longitude: 81° 48.4' W ( -81.80747)
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.