U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 8724948 PUBLICATION DATE: 09/22/2003
Name: EVERGLADES CITY
FL
NOAA Chart: 11429 Latitude: 25° 51.5' N ( 25.85830)
USGS Quad: EVERGLADES CITY Longitude: 81° 23.2' W ( -81.38670)
To reach the tidal bench marks from Everglades City, proceed west along Broadway
from City Hall to the Rod and Gun Club. The bench marks are located in the
vicinity of the club and along Broadway. The gage and staff were located at the
Rod and Gun Club piling bulkhead on the east side of the Barron River.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 4948 A 1978
MONUMENTATION: Tidal Station disk VM#: 9710
AGENCY: National Ocean Survey (NOS) IDB PID#: AC3268
SETTING CLASSIFICATION: Concrete sea wall OPUS PID:
LATITUDE: 25° 51.5' N ( 25.85830) LONGITUDE: 81° 23.2' W ( -81.38670)
The primary bench mark is a disk set in the concrete sea wall at the NE corner
of the Rod and Gun Club property, 45 m (147 ft) NE of the NE corner of the first
house east of the lodge, 0.61 m (2.0 ft) west of the east edge of the seawall,
and 0.55 m (1.8 ft) south of the north edge of the seawall.
BENCH MARK STAMPING: 4948 B 1978
MONUMENTATION: Tidal Station disk VM#: 9711
AGENCY: National Ocean Survey (NOS) IDB PID#: AC3267
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 25° 51.5' N ( 25.85830) LONGITUDE: 81° 23.2' W ( -81.38670)
The bench mark is a disk set in the west concrete foundation for a guy wire of
the micro tower in the median area of Broadway, 23 m (74 ft) SE of the SE corner
of a tennis court, 9 m (30 ft) south of the centerline of the westbound lane of
Broadway, 6 m (21 ft) north of the centerline of the eastbound lane of Broadway,
and 0.55 m (1.8 ft) NW of the NW corner of the concrete foundation.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 8724948 PUBLICATION DATE: 09/22/2003
Name: EVERGLADES CITY
FL
NOAA Chart: 11429 Latitude: 25° 51.5' N ( 25.85830)
USGS Quad: EVERGLADES CITY Longitude: 81° 23.2' W ( -81.38670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 4948 C 1978
MONUMENTATION: Tidal Station disk VM#: 9712
AGENCY: National Ocean Survey (NOS) IDB PID#: AC3269
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 25° 51.4' N ( 25.85670) LONGITUDE: 81° 23.1' W ( -81.38500)
The bench mark is a disk set in the median area of Broadway east of the micro
tower, 36 m (118 ft) SE of the SE corner of City Hall, 25 m (82 ft) SE of Bench
Mark V 249 1965, 8 m (27 ft) north of the eastbound lane of Broadway, 6 m (21
ft) south of the centerline of the westbound lane of Broadway, and 0.37 m (1.2
ft) north of the concrete foundation for a guy wire.
BENCH MARK STAMPING: V 249 1965
MONUMENTATION: Bench Mark disk VM#: 9713
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AC0625
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 25° 51.4' N ( 25.85670) LONGITUDE: 81° 23.1' W ( -81.38500)
The bench mark is a disk set in the lawn in front of City Hall, 25 m (82 ft) NW
of bench mark 4948 C 1978, 15 m (49 ft) south of the SE corner of City Hall, 14
m (47 ft) SE of a flagpole, 5 m (16 ft) north of the north edge of the sidewalk,
and 0.18 m (0.6 ft) east of a monument in front of City Hall. The bench mark is
set flush with the ground, crimped to the top of a copper-clad steel rod driven
10.5 m (34.5 ft) to refusal, and encased in a 4-inch iron pipe.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 8724948 PUBLICATION DATE: 09/22/2003
Name: EVERGLADES CITY
FL
NOAA Chart: 11429 Latitude: 25° 51.5' N ( 25.85830)
USGS Quad: EVERGLADES CITY Longitude: 81° 23.2' W ( -81.38670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5 1929
MONUMENTATION: Tidal Station disk VM#: 9714
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AC0633
SETTING CLASSIFICATION: Concrete monument OPUS PID#: AC0633
LATITUDE: 25° 51.4' N ( 25.85670) LONGITUDE: 81° 23.3' W ( -81.38830)
The bench mark is a disk set in the top of a concrete monument, near the
junction of Riverside Drive and Broadway, in the median of Broadway, 10 m (32
ft) south of the center line of the westbound lane of Broadway, 8 m (25 ft) east
of the extended centerline of Riverside Drive, 47 m (153 ft) NE of and across
Riverside Drive from bench mark E H 7 1962 JACKSONVILLE FLA, and 0.15 m (0.5 ft)
above ground level.
BENCH MARK STAMPING: 3 1928
MONUMENTATION: Tidal Station disk VM#: 17100
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AC0631
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 25° 51.5' N ( 25.85830) LONGITUDE: 81° 23.2' W ( -81.38670)
The bench mark is a disk set in the top of a 1 m x 1 m (2 ft x 2 ft) square
concrete monument, 14.17 m (46.5 ft) NE of the NE corner of he Rod and Gun Club
Lodge, 3.20 m (10.5 ft) NW of a piped well, 6.83 m (22.4 ft) SE of the SW corner
of a cottage, 68.88 m (226.0 ft) west of the centerline of Shorter Avenue, 7.0 m
(23.0 ft) north of the extended centerline of Hibiscus Sreet, and 0.40 m (1.3
ft) above ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 8724948 PUBLICATION DATE: 09/22/2003
Name: EVERGLADES CITY
FL
NOAA Chart: 11429 Latitude: 25° 51.5' N ( 25.85830)
USGS Quad: EVERGLADES CITY Longitude: 81° 23.2' W ( -81.38670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: E H 7 1962 JACKSONVILLE FLA
MONUMENTATION: Bench Mark disk VM#: 17101
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AC0634
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 25° 51.4' N ( 25.85670) LONGITUDE: 81° 23.3' W ( -81.38830)
The bench mark is a disk set in the top of a concrete monument, 46 m (150 ft)
south of the extended center line of Broadway, 8.08 m (26.5 ft) west of the
center line of Riverside Drive, 2 m (8 ft) east of the bank of the Barron River,
43.90 m (144 ft) NW of the center of the junction of Riverside Drive and Ixora
Street, and at ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 8724948 PUBLICATION DATE: 09/22/2003
Name: EVERGLADES CITY
FL
NOAA Chart: 11429 Latitude: 25° 51.5' N ( 25.85830)
USGS Quad: EVERGLADES CITY Longitude: 81° 23.2' W ( -81.38670)
T I D A L D A T U M S
Tidal datums at EVERGLADES CITY based on:
LENGTH OF SERIES: 1 YEAR
TIME PERIOD: February 1978 - January 1979
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8724919 CHOKOLOSKEE
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (09/04/1979) = 1.173
MEAN HIGHER HIGH WATER MHHW = 0.864
MEAN HIGH WATER MHW = 0.791
North American Vertical Datum NAVD88 = 0.632
MEAN TIDE LEVEL MTL = 0.447
MEAN SEA LEVEL MSL = 0.427
MEAN LOW WATER MLW = 0.102
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (01/03/1979) = -0.379
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
4948 A 1978 1.505 0.714
4948 B 1978 1.221 0.430
4948 C 1978 1.242 0.451
V 249 1965 1.053 0.262
5 1929 1.707 0.916
3 1928 1.726 0.935
E H 7 1962 JACKSONVILLE FLA 1.127 0.336
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 8724948 PUBLICATION DATE: 09/22/2003
Name: EVERGLADES CITY
FL
NOAA Chart: 11429 Latitude: 25° 51.5' N ( 25.85830)
USGS Quad: EVERGLADES CITY Longitude: 81° 23.2' W ( -81.38670)
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.