U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
PUBLICATION DATE: 01/18/1983
Station ID: 8746737 SUPERCEDED DATE: 04/21/2003
Name: CUEVAS, EASTERN BAYOU PORTAGE
MISSISSIPPI
NOAA Chart: 11371 Latitude: 30° 21.6' N
USGS Quad: PASSCHRISTIAN Longitude: 89° 13.5' W
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 3.5 miles (5.6
km) to a 4-way stop, then turn left on Pineville Road and continue west for 0.5
mile (0.8 km) to the McFarland residence on the right. 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 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
MONUMENTATION: Survey Disk VM#: 10401
AGENCY: PID:
SETTING CLASSIFICATION: Stainless Steel Rod
The bench mark is on the island where the tide gage was located, 135.8 feet
(41.4 m) NE of the wooden bridge leading to the island, 107 feet (33 m) north of
a slough, 13.6 feet (4.1 m) SW of the SW corner of a small dock on the island
(gage site), and 9.1 feet (2.8 m) south of the shoreline of Bayou Portage. The
bench mark is 0.3 foot (0.1 m) below ground level, crimped to a stainless steel
rod driven 60 feet (18.3 m) to refusal, and encased in a 4-inch PVC pipe and
concrete kickblock.
BENCH MARK STAMPING: 6737 B 1978
MONUMENTATION: Survey Disk VM#: 10402
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Pool Pad
The bench mark is located at the swimming pool near the cottage, 525 feet (160
m) SSW of Bench Mark 6737 A 1978, 89.4 feet (27.2 m) SW of the centerline of the
driveway, and 47.7 feet (14.5 m) NW of the SW corner of the cottage. The bench
mark is set flush in the SE corner of the concrete pad around the swimming pool.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
PUBLICATION DATE: 01/18/1983
Station ID: 8746737 SUPERCEDED DATE: 04/21/2003
Name: CUEVAS, EASTERN BAYOU PORTAGE
MISSISSIPPI
NOAA Chart: 11371 Latitude: 30° 21.6' N
USGS Quad: PASSCHRISTIAN Longitude: 89° 13.5' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6737 C 1978
MONUMENTATION: Survey Disk VM#: 10403
AGENCY: PID:
SETTING CLASSIFICATION: Stainless Steel Rod
The bench mark is along the western boundary of the McFarland property, 298 feet
(91 m) south of the SW corner of the cottage, 254 feet (77 m) south of Bench
Mark 6737 B 1978, 124 feet (38 m) SW of the centerline of the driveway, and 13.1
(4.0 m) NE of a fenceline. The bench mark is 0.4 foot (0.1 m) below ground
level, crimped to a stainless steel rod driven 60 feet (18 m) to refusal, and
encased in a 4-inch PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 6737 D 1978
MONUMENTATION: Survey Disk VM#: 10404
AGENCY: PID:
SETTING CLASSIFICATION: Stainless Steel Rod
The bench mark is 247 feet (75 m) SSE of Bench Mark 6737 C 1978, 34.7 feet (10.6
m) west of the centerline of the McFarland driveway, 24.6 feet (7.5 m) north of
the centerline of Pineville Road, and 1.7 feet (0.5 m) south of a fenceline.
The bench mark is 0.4 foot (0.1 m) below ground level, crimped to a stainless
steel rod driven 60 feet (18 m) 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 5
PUBLICATION DATE: 01/18/1983
Station ID: 8746737 SUPERCEDED DATE: 04/21/2003
Name: CUEVAS, EASTERN BAYOU PORTAGE
MISSISSIPPI
NOAA Chart: 11371 Latitude: 30° 21.6' N
USGS Quad: PASSCHRISTIAN Longitude: 89° 13.5' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6737 E 1978
MONUMENTATION: Survey Disk VM#: 10405
AGENCY: PID:
SETTING CLASSIFICATION: Culvert Head Wall
The bench mark is 551 feet (168 m) WSW of Bench Mark 6737 D 1978, 134.5 feet
(41.3 m) SSW of power pole #5-69, 3-45, 9.7 feet (3.0 m) SE of the centerline
Pineville Road. The bench mark is set flush on the head wall of culverts under
Pineville Road.
BENCH MARK STAMPING: TIE 10 & 7 1943
MONUMENTATION: Survey Disk VM#: 10406
AGENCY: PID#: BH1028
SETTING CLASSIFICATION: Concrete Post
The bench mark is set in the top of a concrete post at Cuevas, 0.25 mile (0.40
km) north along a black top road from the Pineville school, in the Y of the
junction of of black top roads leading NW, NE and south, 234 feet (71 m) north
of the north end of a bridge over Portage Canal, 122.5 feet (37 m) NE and across
the road from the NE corner of the post office, store and service station
building, 63 feet (19 m) NW of the centerline of the NE road, 35 feet (11 m) NE
of the centerline of the NW road, 23 feet (7 m) NE of the NE concrete curb, 17
feet (5 m) east of a power pole, 1.5 feet (0.5 m) SE of a white wooden witness
post and 1 foot (0.3 m) above the level of the road.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
PUBLICATION DATE: 01/18/1983
Station ID: 8746737 SUPERCEDED DATE: 04/21/2003
Name: CUEVAS, EASTERN BAYOU PORTAGE
MISSISSIPPI
NOAA Chart: 11371 Latitude: 30° 21.6' N
USGS Quad: PASSCHRISTIAN Longitude: 89° 13.5' W
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-JANUARY1979
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8747038 HENDERSON AVE. BRIDGE,WOLF RIVER
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (01/01/1979) = 2.94
MEAN HIGHER HIGH WATER MHHW = 1.89
MEAN HIGH WATER MHW = 1.72
MEAN TIDE LEVEL MTL = 0.97
MEAN LOW WATER MLW = 0.21
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (01/24/1979) = -1.69
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
6737 A 1978 2.78 1.06
6737 B 1978 14.24 12.52
6737 C 1978 12.61 10.89
6737 D 1978 10.62 8.90
6737 E 1978 7.18 5.46
TIE 10 & 7 1943 15.40 13.68
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
PUBLICATION DATE: 01/18/1983
Station ID: 8746737 SUPERCEDED DATE: 04/21/2003
Name: CUEVAS, EASTERN BAYOU PORTAGE
MISSISSIPPI
NOAA Chart: 11371 Latitude: 30° 21.6' N
USGS Quad: PASSCHRISTIAN Longitude: 89° 13.5' W
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 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.