U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 8776639 PUBLICATION DATE: 12/16/2020
Name: RIVIERA BEACH, BAFFIN BAY
TX
NOAA Chart: 11308 Latitude: 27° 17.3' N ( 27.28831)
USGS Quad: RIVIERA BEACH Longitude: 97° 39.7' W ( -97.66169)
To reach from the U.S. Post Office at 120 S 7th St in Riviera, TX, head west on
Cypress St for 0.18 Km (0.11 mi) to US Hwy 77 and turn right, proceed on US 77
due north for 0.12 Km (0.07 mi) to FM 771, turn right onto FM 771 and proceed
east for 10.6 Km (6.59 mi) to State Hwy 2510 (FM 1546), turn right on FM 1546
and proceed south for 1.77 Km (1.10 mi) to a dirt road on the left, turn left
and proceed west for 120 m (400 ft) to Williamson Shipyard. The bench marks are
located nearby in the shipyard, and along FM 1546. The tide gauge is located on
the right near the waters edge.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 90010 D
DESIGNATION: 877 6639 90010 D
MONUMENTATION: Tidal Station disk VM#: 12146
AGENCY: Conrad Blucher Institute (CBI) IDB PID:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 27° 16.7' N ( 27.27889) LONGITUDE: 97° 42.6' W ( -97.71025)
The bench mark is set in the grass along the eastern side of fm 1546, 102.6 m
(336.6 ft) north of bench mark 877 6639 90010 C, 97.13 m (318.7 ft) south of
bench mark 877 6639 90010 E, 47.51 m (155.9 ft) south of a sign post that reads
'JCT Farm Road 2510', 7.39 m (24.2 ft) north of a concrete drainage culvert on
the east side of FM 1546 and 6.40 m (21.0 ft) east of the centerline of FM 1546.
The datum point is set flush with the ground being the top of a disk crimped to
a rod and driven an unspecified depth.
BENCH MARK STAMPING: 90010 A
MONUMENTATION: Tidal Station disk VM#: 12145
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 27° 16.7' N ( 27.27830) LONGITUDE: 97° 42.5' W ( -97.70830)
The primary bench mark is a disk crimped to a stainless steel rod, located 28.35
m (93.0 ft) NW of the NW corner of a boat ramp, 11.58 m (38.0 ft) SSW of a big
mesquite tree, and 0.46 m (1.5 ft) north of a 0.05 m x 0.05 m (0.2 ft x 0.2 ft)
survey stake. The bench mark is 0.03 m (0.1 ft) below ground level, crimped to
a stainless steel rod driven 13.72 m (45.0 ft) to refusal, and encased in a
6-inch PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 8776639 PUBLICATION DATE: 12/16/2020
Name: RIVIERA BEACH, BAFFIN BAY
TX
NOAA Chart: 11308 Latitude: 27° 17.3' N ( 27.28831)
USGS Quad: RIVIERA BEACH Longitude: 97° 39.7' W ( -97.66169)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 90010 E
DESIGNATION: 877 6639 90010 E
MONUMENTATION: Tidal Station disk VM#: 12147
AGENCY: Conrad Blucher Institute (CBI) IDB PID:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 27° 16.8' N ( 27.27978) LONGITUDE: 97° 42.6' W ( -97.71025)
The bench mark is a disk crimped to a rod set in the grass at the corner of FM
1546 and the gravel driveway that leads to Williamson Boatyard, 81.40 m (267.1
ft) west of bench mark 877 6639 90010 B, 33.57 m (110.1 ft) NNE of the center of
a barricade sign located at the end of the pavement for FM1546, 10.67 m (35.0
ft) east of the centerline of FM1546, 9.71 m (31.9 ft) WSW of the SE corner of a
9.1 m (29.9 ft) x 15.9 m (52.2 ft) concrete pad and 4.86 m (15.9 ft) NNE of the
northern end of a 30 cm (12 inches) in diameter concrete culvert. The datum
point is set 10 cm (4 inches) below ground being the top of a disk crimped to a
rod and driven an unspecified depth.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 8776639 PUBLICATION DATE: 12/16/2020
Name: RIVIERA BEACH, BAFFIN BAY
TX
NOAA Chart: 11308 Latitude: 27° 17.3' N ( 27.28831)
USGS Quad: RIVIERA BEACH Longitude: 97° 39.7' W ( -97.66169)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 90010 B
DESIGNATION: 877 6639 90010 B
MONUMENTATION: Tidal Station disk VM#: 13947
AGENCY: Conrad Blucher Institute (CBI) IDB PID:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID#: BBGS03
LATITUDE: 27° 16.7' N ( 27.27789) LONGITUDE: 97° 42.6' W ( -97.70939)
The bench mark is set in the grass along the northern side of the gravel
driveway to Williamson Shipyard, 64.20 m (210.6 ft) ESE of the SE corner of a
9.1 m (29.9 ft) x 15.9 m (52.2 ft) concrete pad, 54.30 m (178.1 ft) WSW of the
SW corner of a metal framed building, 31.00 m (101.7 ft) NW of the SW corner of
a concrete pad for a metal barge loading ramp, 8.81 m (28.9 ft) SSW of a tree
and 8.70 m (28.5 ft) north of the centerline of the gravel driveway. The datum
point is set 10 cm (4 inches) below ground being the top of a disk crimped to a
rod and driven an unspecified depth.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 8776639 PUBLICATION DATE: 12/16/2020
Name: RIVIERA BEACH, BAFFIN BAY
TX
NOAA Chart: 11308 Latitude: 27° 17.3' N ( 27.28831)
USGS Quad: RIVIERA BEACH Longitude: 97° 39.7' W ( -97.66169)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 90010 C
DESIGNATION: 877 6639 90010 C
MONUMENTATION: Tidal Station disk VM#: 13948
AGENCY: Conrad Blucher Institute (CBI) IDB PID#: DP0729
SETTING CLASSIFICATION: Stainless steel rod OPUS PID#: DP0729
LATITUDE: 27° 16.7' N ( 27.27797) LONGITUDE: 97° 42.6' W ( -97.71019)
The bench mark is set in the grass at the NE intersection of FM 1546 and the
gravel driveway that leads to Williamson Boatyard, 81.40 m (267.1 ft) west of
bench mark 877 6639 90010 B, 33.57 m (110.1 ft) NNE of the center of a barricade
sign located at the end of the pavement for FM 1546, 10.67 m (35.0 ft) east of
the centerline of FM1546, 9.71 m (31.9 ft) WSW of the SE corner of a 9.1 m (29.9
ft) x 15.9 m (52.2 ft) concrete pad and 4.86 m (15.9 ft) NNE of the northern end
of a 30 cm (12 inches) diameter concrete culvert. The datum point is set flush
with the ground being the top of a disk crimped to a rod and driven an
unspecified depth.
BENCH MARK STAMPING: 6639 F 2019
DESIGNATION: 877 6639 F
MONUMENTATION: Tidal Station disk VM#: 23370
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Concrete slab OPUS PID:
LATITUDE: 27° 16.7' N ( 27.27753) LONGITUDE: 97° 42.5' W ( -97.70847)
The bench mark is a disk set in the SE corner of a 2.74 m (9.0 ft) x 3.96 m
(13.0 ft) x 12 inch (30 cm) thick concrete slab, 8.92 m (29.3 ft) SSE of the SE
corner of a wooden framed building, 8.0 m (26.2 ft) WSW of the western edge of a
boat launch, 7.70 m (25.3 ft) WNW of an angled point in a seawall at a boat
launch, 4.55 m (14.9 ft) WSW of a power pole and 1.30 m (4.3 ft) north of a
seawall along the northern shore of the water.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 8776639 PUBLICATION DATE: 12/16/2020
Name: RIVIERA BEACH, BAFFIN BAY
TX
NOAA Chart: 11308 Latitude: 27° 17.3' N ( 27.28831)
USGS Quad: RIVIERA BEACH Longitude: 97° 39.7' W ( -97.66169)
T I D A L D A T U M S
Tidal datums at RIVIERA BEACH, BAFFIN BAY based on:
LENGTH OF SERIES: 3 MONTHS
TIME PERIOD: December 2019 - February 2020
TIDAL EPOCH: 2002-2006
CONTROL TIDE STATION: 8776604 BAFFIN BAY
Elevations of tidal datums referred to Mean Sea Level (MSL), in METERS:
MEAN SEA LEVEL MSL = 0.000
North American Vertical Datum NAVD88 = -0.179
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MSL
90010 D 2.950
90010 A 0.000
90010 E 3.011
90010 B 1.610
90010 C 1.831
6639 F 2019 0.906
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 8776639 PUBLICATION DATE: 12/16/2020
Name: RIVIERA BEACH, BAFFIN BAY
TX
NOAA Chart: 11308 Latitude: 27° 17.3' N ( 27.28831)
USGS Quad: RIVIERA BEACH Longitude: 97° 39.7' W ( -97.66169)
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.