U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 8
Station ID: 8723423 PUBLICATION DATE: 09/15/2004
Name: TURKEY POINT, BISCAYNE BAY
FL
NOAA Chart: 11462 Latitude: 25° 26.2' N ( 25.43670)
USGS Quad: ARSENICKER KEYS Longitude: 80° 19.8' W ( -80.33000)
To reach the tidal bench marks from the intersection of U.S. Highway 1 and Palm
Drive in Florida City, proceed 13 km (8 mi) east, then 1.9 km (1.2 mi) SE on a
paved road to the Turkey Point Power Plant. The bench marks are in the vicinity
of the Turkey Point Power Plant boat ramp and fuel pier. The tide gage and
staff were located on the southwestern side of the boat ramp.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: A 316 1970
DESIGNATION: A 316
MONUMENTATION: Bench Mark disk VM#: 5846
AGENCY: National Geodetic Survey (NGS) IDB PID#: AC1173
SETTING CLASSIFICATION: Concrete wall OPUS PID:
LATITUDE: 25° 26.3' N ( 25.43830) LONGITUDE: 80° 19.7' W ( -80.32830)
The bench mark is a disk set flush in the top of a concrete wall along the
north side of the cooling canal at the fuel pier, 5.43 m (17.8 ft) south of the
SE fuel pier, 1 m (3 ft) above the fuel pier, 8.23 m (27.0 ft) SE (130
magnetic) of asphalt drive where sidewalk runs perpendicular to drive, and 11.28
m (37.0 ft) SW (190 magnetic) from the NE corner of fence at the south gate
post on asphalt drive.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 8
Station ID: 8723423 PUBLICATION DATE: 09/15/2004
Name: TURKEY POINT, BISCAYNE BAY
FL
NOAA Chart: 11462 Latitude: 25° 26.2' N ( 25.43670)
USGS Quad: ARSENICKER KEYS Longitude: 80° 19.8' W ( -80.33000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: B 316 1970
DESIGNATION: B 316
MONUMENTATION: Bench Mark disk VM#: 5847
AGENCY: National Geodetic Survey (NGS) IDB PID#: AC1172
SETTING CLASSIFICATION: Concrete box OPUS PID:
LATITUDE: 25° 26.2' N ( 25.43670) LONGITUDE: 80° 19.8' W ( -80.33000)
The bench mark is a disk set flush in the NE corner of the top of a 1 m x 2 m (4
ft x 8 ft) concrete box with a metal cover, 39.62 m (130.0 ft) south (170
magnetic) from the west steel fuel tank, 10.67 m (35.0 ft) NNE (30 magnetic)
of the north side of a concrete drain culvert that is positioned under asphalt
drive, 6.55 m (21.5 ft) north of the centerline of the driveway, and level with
the driveway.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 8
Station ID: 8723423 PUBLICATION DATE: 09/15/2004
Name: TURKEY POINT, BISCAYNE BAY
FL
NOAA Chart: 11462 Latitude: 25° 26.2' N ( 25.43670)
USGS Quad: ARSENICKER KEYS Longitude: 80° 19.8' W ( -80.33000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: LM 12 316
DESIGNATION: LM 12 316 FLPCO
MONUMENTATION: Cap-and-Bolt VM#: 5848
AGENCY: Florida Power & Light Company
(FLPCO) IDB PID#: AC3303
SETTING CLASSIFICATION: Galvanized steel pipe OPUS PID:
LATITUDE: 25° 26.0' N ( 25.43330) LONGITUDE: 80° 20.2' W ( -80.33670)
The bench mark is a stainless steel bolt and washer located 0.6 km (0.5 mi) SW
of the power plant, 8.23 m (27 ft) north of the centerline of the paved road,
2.59 m (8.5 ft) east of a foot bridge, and 2.19 m (7.2 ft) south of the intake
canal. The bench mark is cemented into a 0.03 m (0.1 ft) diameter galvanized
steel pipe driven to a depth of 6.1 m (20 ft), and encased in a pipe that
projects 0.21 m (0.7 ft) above ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 8
Station ID: 8723423 PUBLICATION DATE: 09/15/2004
Name: TURKEY POINT, BISCAYNE BAY
FL
NOAA Chart: 11462 Latitude: 25° 26.2' N ( 25.43670)
USGS Quad: ARSENICKER KEYS Longitude: 80° 19.8' W ( -80.33000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: TURKEY POINT NO 2 NO 2
DESIGNATION: TURKEY POINT 2 RM 2
MONUMENTATION: Reference Mark disk VM#: 5849
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AC1176
SETTING CLASSIFICATION: Metal pipe imbedded in ground OPUS PID:
LATITUDE: 25° 26.3' N ( 25.43830) LONGITUDE: 80° 19.1' W ( -80.31830)
The bench mark is a disk set on a metal pipe embeded in ground, located about
1.3 km (0.8 mi) east of the Turkey Point Nuclear Power Plant on a peninsula
known locally as Turkey Point, near the center of a picnic area, 55 m (180 ft)
west of the shoreline at the east end of the point, 2 m (5 ft) west of the west
edge of a stone wall, and 0.46 m (1.5 ft) below ground level in a depression.
Note: Access to the bench mark is through the top of a 0.46 m (1.5 ft) diameter
barrel.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 8
Station ID: 8723423 PUBLICATION DATE: 09/15/2004
Name: TURKEY POINT, BISCAYNE BAY
FL
NOAA Chart: 11462 Latitude: 25° 26.2' N ( 25.43670)
USGS Quad: ARSENICKER KEYS Longitude: 80° 19.8' W ( -80.33000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: TURKEY POINT 3 1972
DESIGNATION: TURKEY PT 3
MONUMENTATION: Survey disk VM#: 5850
AGENCY: National Geodetic Survey (NGS) IDB PID#: AE9200
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 25° 26.3' N ( 25.43830) LONGITUDE: 80° 19.1' W ( -80.31830)
The bench mark is a disk set on top of a round concrete post located 0.3 km (0.2
mi) NW of a point known locally as Turkey Point, 46 m (150 ft) NNW of the
shoreline on the south side, 27 m (88 ft) SSE of the centerline of a gravel
road, and 10 m (32 ft) NNW of the centerline of the road on the south side.
BENCH MARK STAMPING: 3423 A 1993
DESIGNATION: 872 3423 A
MONUMENTATION: Tidal Station disk VM#: 12527
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete bulkhead OPUS PID:
LATITUDE: 25° 26.2' N ( 25.43670) LONGITUDE: 80° 19.7' W ( -80.32830)
The bench mark is a disk set flush in the SW corner of the top of a concrete
bulkhead, attached to a 1.83 m x 2.44 m (6.0 ft x 8.0 ft) covered concrete pad
(fish cleaning stand), 8.23 m (27.0 ft) west of the southwestern corner of the
boat ramp, 8 m (26 ft) south of a 0.3 m (1 ft) square concrete light pole with
two lights mounted at the top, 0.21 m (0.7 ft) north of the south edge of
bulkhead, and 0.21 m (0.8 ft) east of the west end of bulkhead.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 8
Station ID: 8723423 PUBLICATION DATE: 09/15/2004
Name: TURKEY POINT, BISCAYNE BAY
FL
NOAA Chart: 11462 Latitude: 25° 26.2' N ( 25.43670)
USGS Quad: ARSENICKER KEYS Longitude: 80° 19.8' W ( -80.33000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 3423 B 1993
DESIGNATION: 872 3423 B
MONUMENTATION: Tidal Station disk VM#: 12528
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete pad OPUS PID:
LATITUDE: 25° 26.2' N ( 25.43670) LONGITUDE: 80° 19.7' W ( -80.32830)
The bench mark is a disk set flush in the top of a 2.13 m x 2.13 m (7.0 ft x 7.0
ft) concrete pad, 30.48 m (100.0 ft) north of the SW end of the bulkhead, 7.47 m
(24.5 ft) west of the NW corner of the boat ramp, and 0.43 m (1.4 ft) east of a
steel I-beam covered with plastic piping located in the concrete pad.
BENCH MARK STAMPING: 3423 C 1993
DESIGNATION: 872 3423 C 1993
MONUMENTATION: Tidal Station disk VM#: 12529
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete bulkhead OPUS PID:
LATITUDE: 25° 26.2' N ( 25.43670) LONGITUDE: 80° 19.7' W ( -80.32830)
The bench mark is a disk set flush in the top of a concrete bulkhead on the SE
side of the boat ramp, 4.57 m (15.0 ft) west of the SE end of the bulkhead, 3.81
m (12.5 ft) east of the SW corner of the bulkhead to the boat ramp, and 0.15 m
(0.5 ft) north of the south edge of the bulkhead.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 8
Station ID: 8723423 PUBLICATION DATE: 09/15/2004
Name: TURKEY POINT, BISCAYNE BAY
FL
NOAA Chart: 11462 Latitude: 25° 26.2' N ( 25.43670)
USGS Quad: ARSENICKER KEYS Longitude: 80° 19.8' W ( -80.33000)
T I D A L D A T U M S
Tidal datums at TURKEY POINT, BISCAYNE BAY based on:
LENGTH OF SERIES: 1 YEAR
TIME PERIOD: May 1970 - April 1971
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8723170 MIAMI BEACH (CITY PIER)
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (10/18/1970) = 0.935
MEAN HIGHER HIGH WATER MHHW = 0.543
North American Vertical Datum NAVD88 = 0.536
MEAN HIGH WATER MHW = 0.525
MEAN TIDE LEVEL MTL = 0.279
MEAN SEA LEVEL MSL = 0.271
MEAN LOW WATER MLW = 0.033
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (04/24/1971) = -0.340
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
A 316 1970 2.617 2.092
B 316 1970 2.154 1.629
LM 12 316 2.369 1.844
TURKEY POINT NO 2 NO 2 0.560 0.035
TURKEY POINT 3 1972 1.078 0.553
3423 A 1993 1.187 0.662
3423 B 1993 1.174 0.649
3423 C 1993 1.183 0.658
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 8 of 8
Station ID: 8723423 PUBLICATION DATE: 09/15/2004
Name: TURKEY POINT, BISCAYNE BAY
FL
NOAA Chart: 11462 Latitude: 25° 26.2' N ( 25.43670)
USGS Quad: ARSENICKER KEYS Longitude: 80° 19.8' W ( -80.33000)
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.