U.S. DEPARTMENT OF COMMERCE
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National Ocean Service
Datums Page Page 1 of 6
Station ID: 8770542 PUBLICATION DATE: 07/08/2021
Name: BUFFALO BAYOU
NOAA Chart: 11325 Latitude: 29° 45.7' N ( 29.76190)
USGS Quad: SETTEGAST, TX Longitude: 95° 20.7' W ( -95.34430)
To reach from the U.S. Post Office at 701 San Jacinto St in Houston, TX, head
northeast on San Jacinto St. 0.6 Km (0.4 mi) to Franklin Street, turn right
onto Franklin Street and proceed southeast 0.9 Km (0.6 mi) to St. Emanuel St.,
stay left and continue onto Navigation Blvd for 0.5 Km (0.3 mi) which will then
veer slightly right and become S. Jensen Dr, continue straight on S. Jensen Dr
for 0.2 Km (0.1 mi) to the parking lot for Talento Bilingue De Houston, located
at 333 S Jensen Dr, then from the northern edge of the parking lot proceed by
foot along the walkway heading northwest for 61.0 m (200 ft) to a stairway that
leads to the Buffalo Bayou. The bench marks are located in the immediate area of
the gauge, along the eastern side of Navigation Blvd and under the elevated
Interstate 69. The tide gauge was located near a stairway that leads to the
Buffalo Bayou.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 0542 B 2019
DESIGNATION: 877 0542 B
MONUMENTATION: Tidal Station disk VM#: 23333
AGENCY: National Ocean Survey/Service (NOS) IDB PID:
SETTING CLASSIFICATION: Concrete Wall OPUS PID:
LATITUDE: 29° 45.7' N ( 29.76186) LONGITUDE: 95° 20.7' W ( -95.34428)
The primary bench mark is a disk set in a concrete wall located at the west end
of the Buffalo Bayou canoe launch, 12.00 m (39.4 ft) west of a light pole near
the South Jenson Dr Bridge, 5.50 m (18.0 ft) west of a handrail, 4.40 m (14.4
ft) NNW of a light pole near the stairway, 2.40 m (7.9 ft) WNW of a handrail at
the base of the stairs on the western side, 2.20 m (7.2 ft) NE of the end of a
sheet pile wall and 1.22 m (4.0 ft) south of the northern end of the wall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 8770542 PUBLICATION DATE: 07/08/2021
Name: BUFFALO BAYOU
NOAA Chart: 11325 Latitude: 29° 45.7' N ( 29.76190)
USGS Quad: SETTEGAST, TX Longitude: 95° 20.7' W ( -95.34430)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: N 1503 1987
DESIGNATION: N 1503
MONUMENTATION: Vertical Control disk VM#: 23334
AGENCY: NGS IDB PID#: AW5525
SETTING CLASSIFICATION: Bridge Pier OPUS PID:
LATITUDE: 29° 45.5' N ( 29.75813) LONGITUDE: 95° 21.1' W ( -95.35187)
The bench mark is a disk set vertically in the SW face of a concrete pillar
supporting the elevated Interstate 69, 17.90 m (58.7 ft) SE of the centerline of
Hamilton St, 13.30 m (43.6 ft) NW of the centerline of Chartres St, 9.60 m (31.5
ft) NW of a traffic signal, 6.20 m (20.3 ft) SE of a light pole and 3.70 m (12.1
ft) NE of the centerline of Franklin Avenue.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 8770542 PUBLICATION DATE: 07/08/2021
Name: BUFFALO BAYOU
NOAA Chart: 11325 Latitude: 29° 45.7' N ( 29.76190)
USGS Quad: SETTEGAST, TX Longitude: 95° 20.7' W ( -95.34430)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: E 1277 1978
DESIGNATION: E 1277
MONUMENTATION: Vertical Control disk VM#: 23335
AGENCY: NGS IDB PID#: AW0874
SETTING CLASSIFICATION: Stainless steel rod w/o sleeve. OPUS PID#: AW0874
LATITUDE: 29° 45.3' N ( 29.75489) LONGITUDE: 95° 20.3' W ( -95.33822)
The bench mark is set along the southern side of Navigation Boulevard and to the
west of the train track, 11.00 m (36.1 ft) south of the corner of a chain link
fence, 4.70 m (15.4 ft) SSE of the centerline of Navigation Boulevard, 3.90 m
(12.8 ft) ESE of an abandoned asphalt road, 3.70 m (12.1 ft) north of a
building, 1.50 m (4.9 ft) NW of the western side of the railroad tracks, 0.80 m
(2.6 ft) SW of a railroad sign, 0.50 m (1.6 ft) WSW of power pole 1894 and 7.62
cm (3 inches) below the ground. The datum point is a disk crimped to the top of
a rod set 7 cm (3 inches) below ground and driven an unspecified distance to
refusal.
BENCH MARK STAMPING: 0542 A 2019
DESIGNATION: 877 0542 A
MONUMENTATION: Tidal Station disk VM#: 23336
AGENCY: National Ocean Survey/Service (NOS) IDB PID:
SETTING CLASSIFICATION: Concrete Wing Wall OPUS PID#: BBG826
LATITUDE: 29° 45.7' N ( 29.76146) LONGITUDE: 95° 20.6' W ( -95.34384)
The bench mark is a disk set in a concrete wing wall for a bridge along S.
Jenson St. which crosses over Buffalo Bayou, 21.40 m (70.2 ft) NE of a building,
14.90 m (48.9 ft) north of a fence corner, 14.00 m (45.9 ft) SE of a light pole
near the stairway, 11.30 m (37.1 ft) SSE of a light pole along the walkway, 8.40
m (27.6 ft) north of a power pole, 6.00 m (19.7 ft) SW of a power pole with a
light and 5.20 m (17.1 ft) WNW of the centerline of S Jensen Dr.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 8770542 PUBLICATION DATE: 07/08/2021
Name: BUFFALO BAYOU
NOAA Chart: 11325 Latitude: 29° 45.7' N ( 29.76190)
USGS Quad: SETTEGAST, TX Longitude: 95° 20.7' W ( -95.34430)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: H 1246 1978
DESIGNATION: H 1246
MONUMENTATION: Vertical Control disk VM#: 23337
AGENCY: NGS IDB PID#: AW0209
SETTING CLASSIFICATION: Bridge Pier OPUS PID:
LATITUDE: 29° 45.3' N ( 29.75511) LONGITUDE: 95° 21.2' W ( -95.35378)
The bench mark is a disk set vertically in the NE face of a concrete pillar
supporting the elevated Interstate 69, 12.20 m (40.0 ft) NE of the centerline of
Texas Avenue, 7.20 m (23.6 ft) northeast of light pole 523545, 5.30 m (17.4 ft)
NW of light pole 523546 and 2.50 m (8.2 ft) NW of the centerline of Chartres St.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 8770542 PUBLICATION DATE: 07/08/2021
Name: BUFFALO BAYOU
NOAA Chart: 11325 Latitude: 29° 45.7' N ( 29.76190)
USGS Quad: SETTEGAST, TX Longitude: 95° 20.7' W ( -95.34430)
T I D A L D A T U M S
Tidal datums at BUFFALO BAYOU based on:
LENGTH OF SERIES: 10 MONTHS
TIME PERIOD: January 2020 - October 2020
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8770777 MANCHESTER, HOUSTON SHIP CHANNEL
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.508
MEAN HIGH WATER MHW = 0.466
MEAN SEA LEVEL MSL = 0.273
MEAN TIDE LEVEL MTL = 0.268
MEAN LOW WATER MLW = 0.069
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum NAVD88 = -0.083
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
0542 B 2019 1.617 1.151
N 1503 1987 14.130 13.664
E 1277 1978 11.869 11.403
0542 A 2019 10.068 9.602
H 1246 1978 14.386 13.920
Foot Notes:
Bench marks H 1246 1978 and N 1503 1987 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 6 of 6
Station ID: 8770542 PUBLICATION DATE: 07/08/2021
Name: BUFFALO BAYOU
NOAA Chart: 11325 Latitude: 29° 45.7' N ( 29.76190)
USGS Quad: SETTEGAST, TX Longitude: 95° 20.7' W ( -95.34430)
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.