U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 7
Station ID: 8722481 PUBLICATION DATE: 07/07/2009
Name: LOXAHATCHEE RIVER
FL
NOAA Chart: 11474 Latitude: 26° 58.2' N ( 26.97000)
USGS Quad: ROOD Longitude: 80° 7.6' W ( -80.12670)
To reach the tidal bench marks from the intersection of U.S. Highway 1 and
Tequesta Drive in Tequesta; proceed west on Tequesta Drive for 2.57 km (1.6 mi)
to Country Club Road; then turn right and proceed north on Country Club Road for
1.77 km (1.1 mi) to North Place; then turn left and proceed south on North Place
for 0.08 km (0.05 mi) to Fairway North; then turn right and proceed west on
Fairway North for 0.48 km (0.3 mi) to River Road; then continue 0.48 km (0.3 mi)
NW on River Road to its end at 347 River Road. The bench marks are located on
the sea wall at 347 River Road. The tide gage and staff were located on the
dock at 347 River Road.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: NO 5 1972
DESIGNATION: 872 2481 TIDAL 5
MONUMENTATION: Tidal Station disk VM#: 5515
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AD6231
SETTING CLASSIFICATION: Concrete sea wall OPUS PID:
LATITUDE: 26° 58.2' N ( 26.97000) LONGITUDE: 80° 7.5' W ( -80.12500)
The primary bench mark is a disk set flush in the top of the 1 foot wide
concrete sea wall 60.96 m (200.0 ft) through the backyard of the residence at
347 River Road, 34.99 m (114.8 ft) NNE of a FLDEP survey mark 2481 N 2006, 10.18
m (33.4 ft) south of the north end of the sea wall and 5.18 m (17.0 ft) south of
the approximate centerline of the wooden boat dock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 7
Station ID: 8722481 PUBLICATION DATE: 07/07/2009
Name: LOXAHATCHEE RIVER
FL
NOAA Chart: 11474 Latitude: 26° 58.2' N ( 26.97000)
USGS Quad: ROOD Longitude: 80° 7.6' W ( -80.12670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: D 516 2001
DESIGNATION: D 516
MONUMENTATION: Flange-encased Rod VM#: 18706
AGENCY: Gcy, Inc. Surveyors & Mappers IDB PID#: AJ5646
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 26° 58.6' N ( 26.97667) LONGITUDE: 80° 7.7' W ( -80.12833)
The benchmark is a stainless steel rod located 8.93 m (29.3 ft) west of west
edge of pavement of Country Club Drive and 6.86 m (22.5 ft) north of north edge
of pavement of S.E. Island Way, 4.18 m (13.7 ft) NW of a fire hydrant, and 0.55
m (1.8 ft) east of a carsonite witness post. The bench mark is crimped to the
top of a stainless steel rod. Access is through an aluminum access cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 7
Station ID: 8722481 PUBLICATION DATE: 07/07/2009
Name: LOXAHATCHEE RIVER
FL
NOAA Chart: 11474 Latitude: 26° 58.2' N ( 26.97000)
USGS Quad: ROOD Longitude: 80° 7.6' W ( -80.12670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: PAL B 2 1980 BSM
DESIGNATION: PAL B 2 FLDNR
MONUMENTATION: Bench Mark disk VM#: 18707
AGENCY: Florida Department of Natural ResourcesIDB PID#: AD5792
SETTING CLASSIFICATION: Concrete Monument OPUS PID:
LATITUDE: 26° 58.2' N ( 26.97000) LONGITUDE: 80° 6.9' W ( -80.11500)
The benchmark is a disk set 18.99 m (62.3 ft) west of the centerline of the road
to Turtle Creek development, almost directly across from the center of the
junction of North Place with Country Club Road, 6.86 m (22.5 ft) south of power
pole 586c1202 with a witness sign attached, and 4.75 m (15.6 ft) north of the
Country Club Road centerline.
BENCH MARK STAMPING: 2481 L 2006
DESIGNATION: 872 2481 L TIDAL
MONUMENTATION: Tidal Station disk VM#: 18708
AGENCY: Florida Department of Environmental
Protection IDB PID#: DI9524
SETTING CLASSIFICATION: Concrete Box Drain OPUS PID#: DI9524
LATITUDE: 26° 58.2' N ( 26.97000) LONGITUDE: 80° 7.2' W ( -80.12000)
The benchmark is a disk set flush in the top of a 3.5 ft by 4.5 ft concrete box
drain level with the ground located 24.38 m (80.0 ft) SE of the approximate
centerline of Fairway North, 14.75 m (48.4 ft) SE of the mailbox for the
residence at 287 River Drive, 10.36 m (34.0 ft) NW of the approximate centerline
of the concrete driveway to the residence at 284 River Drive, 7.32 m (24.0 ft)
south of a black street-light pole, and 4.91 m (16.1 ft) NE of the approximate
centerline of River Drive.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 7
Station ID: 8722481 PUBLICATION DATE: 07/07/2009
Name: LOXAHATCHEE RIVER
FL
NOAA Chart: 11474 Latitude: 26° 58.2' N ( 26.97000)
USGS Quad: ROOD Longitude: 80° 7.6' W ( -80.12670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 2481 M 2006
DESIGNATION: 872 2481 M TIDAL
MONUMENTATION: Tidal Station disk VM#: 18709
AGENCY: Florida Department of Environmental
Protection IDB PID#: DI9523
SETTING CLASSIFICATION: Concrete Box Drain OPUS PID:
LATITUDE: 26° 58.2' N ( 26.97000) LONGITUDE: 80° 7.5' W ( -80.12500)
The benchmark is a disk set flush in the top of the NW corner of a 3.5 ft by 4.5
ft concrete box drain on the property line between 335 and 339 River Drive and
level with River Drive; 80.35 m (263.6 ft) east of a NOS bench mark 2481 K 1986,
7.77 m (25.5 ft) east of the approximate centerline of a concrete driveway to
the residence at 339 River Drive, 5.94 m (19.5 ft) west of the approximate
centerline of a brick driveway to the residence at 335 River Drive, 5.18 m (17.0
ft) north of a wooden power pole, and 4.27 m (14.0 ft) south of the approximate
centerline of River Drive.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 7
Station ID: 8722481 PUBLICATION DATE: 07/07/2009
Name: LOXAHATCHEE RIVER
FL
NOAA Chart: 11474 Latitude: 26° 58.2' N ( 26.97000)
USGS Quad: ROOD Longitude: 80° 7.6' W ( -80.12670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 2481 N 2006
DESIGNATION: 872 2481 N TIDAL
MONUMENTATION: Tidal Station disk VM#: 18710
AGENCY: Florida Department of Environmental
Protection IDB PID#: DI9522
SETTING CLASSIFICATION: Concrete Seawall OPUS PID:
LATITUDE: 26° 58.2' N ( 26.97000) LONGITUDE: 80° 7.5' W ( -80.12500)
The bench mark is a disk set flush in the top of the concrete sea wall behind
the guest house, 60.96 m (200.0 ft) westerly through the backyard of the
residence at 347 River Road. 57.67 m (189.2 ft) west of a bench mark 872 2481 K
1986, 57.30 m (188.0 ft) west of the edge of the pavement on the extended
centerline of River Drive, 39.93 m (131.0 ft) SSW of the centerline of the
wooden boat dock behind the residence at 352 River Drive, 34.99 m (114.8 ft) SSW
of the a bench mark 872 2481 NO 5 1972, and 17.56 m (57.6 ft) NW of the NW
corner of the guest house of the residence at 347 River Drive.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 7
Station ID: 8722481 PUBLICATION DATE: 07/07/2009
Name: LOXAHATCHEE RIVER
FL
NOAA Chart: 11474 Latitude: 26° 58.2' N ( 26.97000)
USGS Quad: ROOD Longitude: 80° 7.6' W ( -80.12670)
T I D A L D A T U M S
Tidal datums at LOXAHATCHEE RIVER based on:
LENGTH OF SERIES: 2 MONTHS
TIME PERIOD: December 1972 - January 1973
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8722557 NORTH PALM BEACH
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
North American Vertical Datum NAVD88 = 0.712
MEAN HIGHER HIGH WATER MHHW = 0.680
MEAN HIGH WATER MHW = 0.635
MEAN TIDE LEVEL MTL = 0.341
MEAN SEA LEVEL MSL = 0.340
MEAN LOW WATER MLW = 0.047
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
NO 5 1972 1.231 0.596
D 516 2001 2.681 2.046
PAL B 2 1980 BSM 2.866 2.231
2481 L 2006 2.449 1.814
2481 M 2006 2.082 1.447
2481 N 2006 1.257 0.622
Foot Notes:
Bench marks D 516 2001, PAL B 2 1980 BSM, 2381 L 2006, 2481 M 2006, and 2481 N
2006 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 7 of 7
Station ID: 8722481 PUBLICATION DATE: 07/07/2009
Name: LOXAHATCHEE RIVER
FL
NOAA Chart: 11474 Latitude: 26° 58.2' N ( 26.97000)
USGS Quad: ROOD Longitude: 80° 7.6' W ( -80.12670)
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.