U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 8723089 PUBLICATION DATE: 04/01/2004
Name: BISCAYNE CREEK, INTRACOASTAL WATERWAY
FL
NOAA Chart: 11466 Latitude: 25° 52.8' N ( 25.88000)
USGS Quad: NORTH MIAMI Longitude: 80° 9.8' W ( -80.16330)
To reach the tidal bench marks from the intersection of U.S. Highway 1 (Biscayne
Boulevard) and Broad Causeway (NE 123rd Street) in North Miami, proceed south on
U.S. Highway 1 for 0.8 km (0.5 mi) to the driveway leading to the Lear School
(11211 Biscayne Boulevard). The bench marks are the vicinity of the school.
The tide gage and staff were located on the Lear School Pier.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: F 317 1970
DESIGNATION: F 317
MONUMENTATION: Bench Mark disk VM#: 5763
AGENCY: National Geodetic Survey (NGS) IDB PID#: AC2352
SETTING CLASSIFICATION: Concrete bulkhead OPUS PID:
LATITUDE: 25° 52.9' N ( 25.88170) LONGITUDE: 80° 9.9' W ( -80.16500)
The primary bench mark is a disk set flush in a drill hole in the top of the
west end of a concrete bulkhead, 11 m (36 ft) SW of the SW corner of the ladies
restroom, and 1.07 m (3.5 ft) east of the west end of the bulkhead.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 8723089 PUBLICATION DATE: 04/01/2004
Name: BISCAYNE CREEK, INTRACOASTAL WATERWAY
FL
NOAA Chart: 11466 Latitude: 25° 52.8' N ( 25.88000)
USGS Quad: NORTH MIAMI Longitude: 80° 9.8' W ( -80.16330)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: H 317 1970
DESIGNATION: H 317
MONUMENTATION: Bench Mark disk VM#: 5764
AGENCY: National Geodetic Survey (NGS) IDB PID#: AC2347
SETTING CLASSIFICATION: Concrete bulkhead OPUS PID:
LATITUDE: 25° 52.9' N ( 25.88170) LONGITUDE: 80° 9.7' W ( -80.16170)
The bench mark is a disk set flush in the top of a concrete bulkhead at the west
end of a curve in the bulkhead, 15.54 m (51.0 ft) SE of the SE corner of the sun
room.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 8723089 PUBLICATION DATE: 04/01/2004
Name: BISCAYNE CREEK, INTRACOASTAL WATERWAY
FL
NOAA Chart: 11466 Latitude: 25° 52.8' N ( 25.88000)
USGS Quad: NORTH MIAMI Longitude: 80° 9.8' W ( -80.16330)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: J 317 1970
DESIGNATION: J 317
MONUMENTATION: Bench Mark disk VM#: 5765
AGENCY: National Geodetic Survey (NGS) IDB PID#: AC2354
SETTING CLASSIFICATION: Concrete bulkhead OPUS PID:
LATITUDE: 25° 52.9' N ( 25.88170) LONGITUDE: 80° 9.9' W ( -80.16500)
The bench mark is a disk set flush in a concrete bulkhead, 32 m (105 ft) NE of
the NE corner of the sun room and 2.65 m (8.7 ft) west of the NE corner of the
sea wall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 8723089 PUBLICATION DATE: 04/01/2004
Name: BISCAYNE CREEK, INTRACOASTAL WATERWAY
FL
NOAA Chart: 11466 Latitude: 25° 52.8' N ( 25.88000)
USGS Quad: NORTH MIAMI Longitude: 80° 9.8' W ( -80.16330)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: K 317 1970
DESIGNATION: K 317
MONUMENTATION: Bench Mark disk VM#: 5766
AGENCY: National Geodetic Survey (NGS) IDB PID#: AC2349
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 25° 52.8' N ( 25.88000) LONGITUDE: 80° 9.9' W ( -80.16500)
The bench mark is a disk located near the NE corner of a fence, 3.66 m (12.0 ft)
south of the centerline of the driveway, 1.16 m (3.8 ft) west of a fence corner
post, 0.15 m (0.5 ft) north of the fence line, and 0.09 m (0.3 ft) north of a
metal witness post. The bench mark is crimped to a copper-clad steel rod driven
8.5 m (28 ft) to refusal, and encased in a 0.09 m (0.3 ft) steel pipe which
projects 0.07 m (0.25 ft) above ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 8723089 PUBLICATION DATE: 04/01/2004
Name: BISCAYNE CREEK, INTRACOASTAL WATERWAY
FL
NOAA Chart: 11466 Latitude: 25° 52.8' N ( 25.88000)
USGS Quad: NORTH MIAMI Longitude: 80° 9.8' W ( -80.16330)
T I D A L D A T U M S
Tidal datums at BISCAYNE CREEK, INTRACOASTAL WATERWAY 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 (10/14/1970) = 1.021
MEAN HIGHER HIGH WATER MHHW = 0.718
MEAN HIGH WATER MHW = 0.697
North American Vertical Datum NAVD88 = 0.644
MEAN TIDE LEVEL MTL = 0.369
MEAN SEA LEVEL MSL = 0.366
MEAN LOW WATER MLW = 0.041
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (02/10/1971) = -0.247
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
F 317 1970 1.616 0.919
H 317 1970 1.604 0.907
J 317 1970 1.603 0.906
K 317 1970 1.726 1.029
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 8723089 PUBLICATION DATE: 04/01/2004
Name: BISCAYNE CREEK, INTRACOASTAL WATERWAY
FL
NOAA Chart: 11466 Latitude: 25° 52.8' N ( 25.88000)
USGS Quad: NORTH MIAMI Longitude: 80° 9.8' W ( -80.16330)
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.