U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8726996 PUBLICATION DATE: 02/08/2005
Name: CROSS BAYOU, NEW PORT RICHEY
FL
NOAA Chart: 11409 Latitude: 28° 14.8' N ( 28.24670)
USGS Quad: ELFERS Longitude: 82° 44.1' W ( -82.73500)
To reach the tidal bench marks from the intersection of West Main Street and
U.S. Highway 19 in New Port Richey, proceed west on West Main Street for 0.8 km
(0.5 mi) to the New Port Richey Water Treatment Plant. The bench marks are at
the Water Treatment Plant and along West Main Street. The tide gage and staff
were at the abandoned Lindrick Service Corporation water treatment plant across
Cross Bayou from the New Port Richey Water Treatment Plant.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 6996 B 1976
DESIGNATION: 872 6996 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 7696
AGENCY: National Ocean Survey (NOS) IDB PID#: AL7444
SETTING CLASSIFICATION: Concrete decking OPUS PID:
LATITUDE: 28° 15.0' N ( 28.25000) LONGITUDE: 82° 43.9' W ( -82.73170)
The primary bench mark is a disk set in the concrete decking on the west side of
the blower building at the water treatment plant, north of a rectangular setting
tank and south of a circular tank, 61 m (200 ft) SE of bench mark 6996 D 1976,
3.20 m (10.5 ft) south of the NW corner of the blower building, and 2.90 m (9.5
ft) north of the SW corner of the building.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8726996 PUBLICATION DATE: 02/08/2005
Name: CROSS BAYOU, NEW PORT RICHEY
FL
NOAA Chart: 11409 Latitude: 28° 14.8' N ( 28.24670)
USGS Quad: ELFERS Longitude: 82° 44.1' W ( -82.73500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6996 A 1976
DESIGNATION: 872 6996 A TIDAL
MONUMENTATION: Survey disk VM#: 7695
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 28° 14.8' N ( 28.24670) LONGITUDE: 82° 44.1' W ( -82.73500)
NOTE: DESTROYED OR NOT RECOVERED ON 01/01/83. The bench mark is a disk at the
Lindrick Service Corporation Water Treatment Plant, 11.95 m (39.2 ft) west of
the wing wall that projects from the south side of the water treatment tank and
0.79 m (2.6 ft) SE of the SW corner of the tank, and is set flush into the
concrete corner of the tank.
BENCH MARK STAMPING: 6996 D 1976
DESIGNATION: 872 6996 D TIDAL
MONUMENTATION: Tidal Station disk VM#: 7698
AGENCY: National Ocean Survey (NOS) IDB PID#: AL7443
SETTING CLASSIFICATION: Concrete tank wall OPUS PID:
LATITUDE: 28° 15.0' N ( 28.25000) LONGITUDE: 82° 43.9' W ( -82.73170)
The bench mark is a disk set in the top of the west concrete wall of the second
treatment tank from the most northerly of four tanks at the water treatment
plant, 31.70 m (104.0 ft) SSE of bench mark 6996 E 1976, 12.50 m (41.0 ft) east
of the west chainlink fence, and 26.21 m (86.0 ft) SSE of the SE corner of the
garage.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8726996 PUBLICATION DATE: 02/08/2005
Name: CROSS BAYOU, NEW PORT RICHEY
FL
NOAA Chart: 11409 Latitude: 28° 14.8' N ( 28.24670)
USGS Quad: ELFERS Longitude: 82° 44.1' W ( -82.73500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6996 E 1976
DESIGNATION: 872 6996 E TIDAL
MONUMENTATION: Tidal Station disk VM#: 7699
AGENCY: National Ocean Survey (NOS) IDB PID#: AL7445
SETTING CLASSIFICATION: Concrete garage deck OPUS PID:
LATITUDE: 28° 15.0' N ( 28.25000) LONGITUDE: 82° 43.9' W ( -82.73170)
The bench mark is a disk set in the concrete decking at the NE corner of the
garage at the water treatment plant, 23.77 m (78.0 ft) SW of bench mark 6996 F
1976, 14.63 m (48.0 ft) west of the SW corner of the main office and control
building, 0.30 m (1.0 ft) south of the NE corner of the garage, and 0.30 m (1.0
ft) west of the east wall of the garage.
BENCH MARK STAMPING: 6996 F 1976
DESIGNATION: 872 6996 F TIDAL
MONUMENTATION: Tidal Station disk VM#: 7700
AGENCY: National Ocean Survey (NOS) IDB PID#: AL7442
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 28° 15.0' N ( 28.25000) LONGITUDE: 82° 43.9' W ( -82.73170)
The bench mark is a disk located at the New Port Richey Water Treatment Plant,
19.93 m (65.4 ft) NW of the NW corner of the main office and control building,
7.62 m (25.0 ft) west of the centerline of the entrance road, and 0.30 m (1.0
ft) south of a witness post. The bench mark is crimped to the top of a
copper-clad steel rod driven an unknown depth to refusal, and encased in a PVC
pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8726996 PUBLICATION DATE: 02/08/2005
Name: CROSS BAYOU, NEW PORT RICHEY
FL
NOAA Chart: 11409 Latitude: 28° 14.8' N ( 28.24670)
USGS Quad: ELFERS Longitude: 82° 44.1' W ( -82.73500)
T I D A L D A T U M S
Tidal datums at CROSS BAYOU, NEW PORT RICHEY based on:
LENGTH OF SERIES: 1 MONTH
TIME PERIOD: March 1976 - March 1976
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8726924 ANCLOTE RIVER
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 1.024
MEAN HIGH WATER MHW = 0.901
North American Vertical Datum NAVD88 = 0.678
MEAN SEA LEVEL MSL = 0.550
MEAN TIDE LEVEL MTL = 0.535
MEAN LOW WATER MLW = 0.169
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
6996 B 1976 2.717 1.816
6996 A 1976 2.275 1.374
6996 D 1976 3.282 2.381
6996 E 1976 2.760 1.859
6996 F 1976 2.467 1.566
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8726996 PUBLICATION DATE: 02/08/2005
Name: CROSS BAYOU, NEW PORT RICHEY
FL
NOAA Chart: 11409 Latitude: 28° 14.8' N ( 28.24670)
USGS Quad: ELFERS Longitude: 82° 44.1' W ( -82.73500)
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.