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Datums Page Page 1 of 6
Station ID: 8746737 PUBLICATION DATE: 02/26/2004
Name: CUEVAS, EASTERN BAYOU PORTAGE
MS
NOAA Chart: 11371 Latitude: 30° 21.6' N ( 30.36000)
USGS Quad: PASS CHRISTIAN Longitude: 89° 13.5' W ( -89.22500)
To reach the tidal bench marks from the intersection of Menge Avenue and U.S.
Highway 90 in Pass Christian, proceed north on Menge Avenue for 5.6 km (3.5 mi)
to a 4-way stop, then turn left and proceed west on Pineville Road for 0.8 km
(0.5 mi) to the McFarland residence on the right, then turn left and proceed
north on the driveway to a cottage and pool, then continue by foot north past
the main residence, then cross a foot bridge over a small slough to an island.
The bench marks are located along Pineville Road and on the McFarland property.
The tide gage and staff were located on a dock on the north side of the island.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 6737 A 1978
DESIGNATION: 874 6737 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 10401
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 30° 21.6' N ( 30.36000) LONGITUDE: 89° 13.5' W ( -89.22500)
The primary bench mark is a disk located on the island where the tide gage was
located, 41.39 m (135.8 ft) NE of the wooden bridge leading to the island, 33 m
(107 ft) north of a slough, 4.15 m (13.6 ft) SW of the SW corner of a small dock
on the island (gage site), and 2.77 m (9.1 ft) south of the shoreline of Bayou
Portage. The bench mark is set 9 cm (0.3 ft) below ground level, crimped to the
top of a stainless steel rod driven 18.3 m (60 ft) to refusal, and encased in a
4-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: 8746737 PUBLICATION DATE: 02/26/2004
Name: CUEVAS, EASTERN BAYOU PORTAGE
MS
NOAA Chart: 11371 Latitude: 30° 21.6' N ( 30.36000)
USGS Quad: PASS CHRISTIAN Longitude: 89° 13.5' W ( -89.22500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6737 B 1978
DESIGNATION: 874 6737 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 10402
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete pad OPUS PID:
LATITUDE: 30° 21.6' N ( 30.36000) LONGITUDE: 89° 13.5' W ( -89.22500)
The bench mark is a disk set flush in the SE corner of the concrete pad around
the swimming pool, located at the swimming pool near the cottage, 160 m (525 ft)
SSW of bench mark 6737 A 1978, 27.25 m (89.4 ft) SW of the centerline of the
driveway, and 14.54 m (47.7 ft) NW of the SW corner of the cottage.
BENCH MARK STAMPING: 6737 C 1978
DESIGNATION: 874 6737 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 10403
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 30° 21.6' N ( 30.36000) LONGITUDE: 89° 13.5' W ( -89.22500)
The bench mark is a disk located along the western boundary of the McFarland
property, 91 m (298 ft) south of the SW corner of the cottage, 77 m (254 ft)
south of bench mark 6737 B 1978, 38 m (124 ft) SW of the centerline of the
driveway, and 4 m (13 ft) NE of a fenceline. The bench mark is set 12 cm (0.4
ft) below ground level, crimped to the top of a stainless steel rod driven 18.3
m (60 ft) to refusal, and encased in a 4-inch PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 8746737 PUBLICATION DATE: 02/26/2004
Name: CUEVAS, EASTERN BAYOU PORTAGE
MS
NOAA Chart: 11371 Latitude: 30° 21.6' N ( 30.36000)
USGS Quad: PASS CHRISTIAN Longitude: 89° 13.5' W ( -89.22500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6737 D 1978
DESIGNATION: 874 6737 D TIDAL
MONUMENTATION: Tidal Station disk VM#: 10404
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 30° 21.6' N ( 30.36000) LONGITUDE: 89° 13.5' W ( -89.22500)
The bench mark is a disk located 75 m (247 ft) SSE of bench mark 6737 C 1978,
10.58 m (34.7 ft) west of the centerline of the McFarland driveway, 7.50 m (24.6
ft) north of the centerline of Pineville Road, and 0.52 m (1.7 ft) south of a
fenceline. The bench mark is set 12 cm (0.4 ft) below ground level, crimped to
the top of a stainless steel rod driven 18.3 m (60 ft) to refusal, and encased
in a 4-inch PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 6737 E 1978
DESIGNATION: 874 6737 E TIDAL
MONUMENTATION: Tidal Station disk VM#: 10405
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Culvert head wall OPUS PID:
LATITUDE: 30° 21.6' N ( 30.36000) LONGITUDE: 89° 13.5' W ( -89.22500)
The bench mark is a disk set flush in the concrete culvert head wall under
Pineville Road, 168 m (551 ft) WSW of bench mark 6737 D 1978, 41.00 m (134.5 ft)
SSW of power pole #5-69, 3-45, 2.96 m (9.7 ft) SE of the centerline Pineville
Road.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 8746737 PUBLICATION DATE: 02/26/2004
Name: CUEVAS, EASTERN BAYOU PORTAGE
MS
NOAA Chart: 11371 Latitude: 30° 21.6' N ( 30.36000)
USGS Quad: PASS CHRISTIAN Longitude: 89° 13.5' W ( -89.22500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: TIE 10 & 7 1943
DESIGNATION: TIE 10 AND 7
MONUMENTATION: Bench Mark disk VM#: 10406
AGENCY: US Coast & Geodetic Survey
(USC&GS) IDB PID#: BH1028
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 30° 21.6' N ( 30.36000) LONGITUDE: 89° 13.5' W ( -89.22500)
The bench mark is a disk set in the top of a concrete post at Cuevas, 0.40 km
(0.25 mi) north along a black top road from the Pineville school, in the
Y-junction of black top roads leading NW, NE and south, 71 m (234 ft) north of
the north end of a bridge over Portage Canal, 37.34 m (122.5 ft) NE and across
the road from the NE corner of the post office, store and service station
building, 19 m (63 ft) NW of the centerline of the NE road, 11 m (35 ft) NE of
the centerline of the NW road, 7 m (23 ft) NE of the NE concrete curb, 5 m (17
ft) east of a power pole, 0.46 m (1.5 ft) SE of a white wooden witness post and
0.3 m (1 ft) above the level of the road.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 8746737 PUBLICATION DATE: 02/26/2004
Name: CUEVAS, EASTERN BAYOU PORTAGE
MS
NOAA Chart: 11371 Latitude: 30° 21.6' N ( 30.36000)
USGS Quad: PASS CHRISTIAN Longitude: 89° 13.5' W ( -89.22500)
T I D A L D A T U M S
Tidal datums at CUEVAS, EASTERN BAYOU PORTAGE based on:
LENGTH OF SERIES: 3 MONTHS
TIME PERIOD: November 1978 - January 1979
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8747038 HENDERSON AVENUE BRIDGE, WOLF RIVER
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.575
MEAN HIGH WATER MHW = 0.535
MEAN TIDE LEVEL MTL = 0.296
MEAN SEA LEVEL MSL = 0.290
MEAN LOW WATER MLW = 0.057
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
6737 A 1978 0.795 0.260
6737 B 1978 4.288 3.753
6737 C 1978 3.790 3.255
6737 D 1978 3.184 2.649
6737 E 1978 2.135 1.600
TIE 10 & 7 1943 4.643 4.108
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 8746737 PUBLICATION DATE: 02/26/2004
Name: CUEVAS, EASTERN BAYOU PORTAGE
MS
NOAA Chart: 11371 Latitude: 30° 21.6' N ( 30.36000)
USGS Quad: PASS CHRISTIAN Longitude: 89° 13.5' W ( -89.22500)
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.
Station Location
Published bench mark
Unpublished bench mark
