U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8728941 PUBLICATION DATE: 02/05/2004
Name: NORTH PRONG, WETAPPO CREEK
FL
NOAA Chart: 11389 Latitude: 30° 0.2' N ( 30.00330)
USGS Quad: WETAPPO CREEK Longitude: 85° 20.9' W ( -85.34830)
To reach the tidal bench marks from the intersection of U.S. Highway 98 and
State Road 386 in Mexico Beach, proceed 11.3 km (7.0 mi) north and east on State
Road 386 to Whitfield Landing Road, which leads north to Wetappo Landing, then
turn left and proceed north on Whitfield Landing Road for 0.3 km (0.2 mi) to a
boat ramp at the north prong of Wetappo Creek. The bench marks are in the area
between State Road 386 and Wetappo Creek. The tide gage and staff were located
on a pier built in the creek.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 8941 A 1976
DESIGNATION: 872 8941 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 9910
AGENCY: National Ocean Survey (NOS) IDB PID#: BE3805
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 30° 0.1' N ( 30.00170) LONGITUDE: 85° 20.9' W ( -85.34830)
The primary bench mark is a disk located 76 m (248 ft) NNE of bench mark 8941 C
1976, 42.67 m (140.0 ft) north of the centerline of the dirt road leading west
from the boat ramp nearest the water, 16.61 m (54.5 ft) north of the NE corner
of the porch of a small wooden building between two trailers, and 0.3 m (1 ft)
west of a light pole with a witness sign attached. The bench mark is set 0.15 m
(0.5 ft) below ground level, crimped to the top of a copper-coated rod driven
12.2 m (40 ft) to refusal, encased in a PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8728941 PUBLICATION DATE: 02/05/2004
Name: NORTH PRONG, WETAPPO CREEK
FL
NOAA Chart: 11389 Latitude: 30° 0.2' N ( 30.00330)
USGS Quad: WETAPPO CREEK Longitude: 85° 20.9' W ( -85.34830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8941 B 1976
DESIGNATION: 872 8941 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 9911
AGENCY: National Ocean Survey (NOS) IDB PID#: BE3804
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 30° 0.1' N ( 30.00170) LONGITUDE: 85° 20.9' W ( -85.34830)
The bench mark is a disk located 12.25 m (40.2 ft) north of the centerline of
Whitfield Landing Road, 7 m (23 ft) east of centerline of the boat ramp, and
0.46 m (1.5 ft) NNE of a power pole with a witness sign attached. The bench
mark is set 6 cm (0.2 ft) below ground level, crimped to the top of a
copper-coated rod driven 12.2 m (40 ft) to refusal, and encased in a PVC pipe
and concrete kickblock.
BENCH MARK STAMPING: 8941 C 1976
DESIGNATION: 872 8941 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 9912
AGENCY: National Ocean Survey (NOS) IDB PID#: BE3806
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 30° 0.1' N ( 30.00170) LONGITUDE: 85° 20.9' W ( -85.34830)
The bench mark is a disk located 19.05 m (62.5 ft) ENE of the NE corner of a
trailer, 8.99 m (29.5 ft) south of the centerline of the dirt road, 0.64 m (2.1
ft) WSW of powerline pole #7, and 0.46 m (1.5 ft) west of the NW corner of a
steel fence surrounding the first house on the south side of the road leading
west from the boat ramp. The bench mark is set 0.12 m (0.4 ft) below ground
level, crimped to the top of a copper-coated rod driven 12.2 m (40 ft) 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 3 of 5
Station ID: 8728941 PUBLICATION DATE: 02/05/2004
Name: NORTH PRONG, WETAPPO CREEK
FL
NOAA Chart: 11389 Latitude: 30° 0.2' N ( 30.00330)
USGS Quad: WETAPPO CREEK Longitude: 85° 20.9' W ( -85.34830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8941 D 1976
DESIGNATION: 872 8941 D TIDAL
MONUMENTATION: Tidal Station disk VM#: 9913
AGENCY: National Ocean Survey (NOS) IDB PID#: AS0861
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 29° 59.9' N ( 29.99830) LONGITUDE: 85° 20.9' W ( -85.34830)
The bench mark is a disk located 78 m (256 ft) west of bench mark 8941 E 1976,
16 m (54 ft) east of Whitfield Landing Road, 13 m (42 ft) north of the
centerline of State Road 386, and 0.3 m (1 ft) south of a witness post. The
bench mark is set 0.12 m (0.4 ft) below ground level crimped to the top of a
copper-coated rod driven 12.2 m (40 ft) to refusal, encased in a PVC pipe and
concrete kickblock.
BENCH MARK STAMPING: 8791 E 1976
DESIGNATION: 872 8941 E TIDAL
MONUMENTATION: Tidal Station disk VM#: 9914
AGENCY: National Ocean Survey (NOS) IDB PID#: AS0862
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 29° 59.9' N ( 29.99830) LONGITUDE: 85° 20.8' W ( -85.34670)
The bench mark is a disk located 95 m (310 ft) east of the centerline of the
paved road leading to Wetappo Landing, 78 m (256 ft) east of bench mark 8941 D
1976, 12.68 m (41.6 ft) NNE of the centerline of State Road 386, and 9 m (29 ft)
SW of a powerline pole with a witness sign attached. The bench mark is set 0.12
m (0.4 ft) below ground level, crimped to the top of a copper-coated rod driven
12.2 m (40 ft) to refusal and encased in a PVC pipe and concrete kickblock.
NOTE: The stamping on the mark does not match the designation for the tide
station.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8728941 PUBLICATION DATE: 02/05/2004
Name: NORTH PRONG, WETAPPO CREEK
FL
NOAA Chart: 11389 Latitude: 30° 0.2' N ( 30.00330)
USGS Quad: WETAPPO CREEK Longitude: 85° 20.9' W ( -85.34830)
T I D A L D A T U M S
Tidal datums at NORTH PRONG, WETAPPO CREEK based on:
LENGTH OF SERIES: 1 MONTH
TIME PERIOD: May 1976 - May 1976
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8729015 ALLANTON, EAST BAY
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.516
MEAN HIGH WATER MHW = 0.477
MEAN TIDE LEVEL MTL = 0.269
MEAN SEA LEVEL MSL = 0.262
North American Vertical Datum NAVD88 = 0.191
MEAN LOW WATER MLW = 0.061
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
8941 A 1976 3.293 2.816
8941 B 1976 1.554 1.077
8941 C 1976 3.968 3.491
8941 D 1976 4.407 3.930
8791 E 1976 4.582 4.105
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8728941 PUBLICATION DATE: 02/05/2004
Name: NORTH PRONG, WETAPPO CREEK
FL
NOAA Chart: 11389 Latitude: 30° 0.2' N ( 30.00330)
USGS Quad: WETAPPO CREEK Longitude: 85° 20.9' W ( -85.34830)
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.