U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8727989 PUBLICATION DATE: 02/05/2004
Name: AUCILLA RIVER
FL
NOAA Chart: 11405 Latitude: 30° 7.6' N ( 30.12670)
USGS Quad: NUTALL RISE Longitude: 83° 58.5' W ( -83.97500)
To reach the tidal bench marks from the U.S. Highway 98 bridge over the St.
Marks River in Newport, proceed east on U.S. Highway 98 for 24.5 km (15.2 mi) to
the junction of a graded dirt road leading south (Cord 690), then turn right and
proceed SW on the dirt road for 3.8 km (2.4 mi) to the Mandalay Lodge. The
bench marks are in the area around the lodge. The tide gage and staff were
located on the Mandalay Lodge boathouse pier.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: NO 1 1975
DESIGNATION: 872 7989 TIDAL 1
MONUMENTATION: Tidal Station disk VM#: 8264
AGENCY: National Ocean Survey (NOS) IDB PID#: BD2691
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 30° 7.6' N ( 30.12670) LONGITUDE: 8° 58.4' W ( -8.97333)
The primary bench mark is a disk set in the top of a concrete monument located
on the NE side of the lodge, 10.67 m (35.0 ft) SE of an oak tree, 9.14 m (30.0
ft) east of the NE corner of the lodge, 6.40 m (21.0 ft) NE of the porch and 0.3
m (1 ft) east of the east side of the bottom step to the lodge entrance on the
north side of the building, and at ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8727989 PUBLICATION DATE: 02/05/2004
Name: AUCILLA RIVER
FL
NOAA Chart: 11405 Latitude: 30° 7.6' N ( 30.12670)
USGS Quad: NUTALL RISE Longitude: 83° 58.5' W ( -83.97500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 2 1975
DESIGNATION: 872 7989 TIDAL 2
MONUMENTATION: Tidal Station disk VM#: 8265
AGENCY: National Ocean Survey (NOS) IDB PID#: BD2690
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 30° 7.6' N ( 30.12670) LONGITUDE: 8° 58.4' W ( -8.97333)
The bench mark is a disk set in the top of a concrete monument located along the
shore NE of the boat house, 36.58 m (120.0 ft) north of bench mark 1 1975, 24.38
m (80.0 ft) NNE of the NE corner of the boathouse, 6.10 m (20.0 ft) west of a
dead oak tree, 3 m (10 ft) east of the NW property corner for the Mandalay
Lodge, 1.83 m (6.0 ft) east of a water oak tree, 1.07 m (3.5 ft) north of a
palm tree, 4 m (13 ft) west of a 0.76 m (2.5 ft) diameter cypress tree, and at
ground level.
BENCH MARK STAMPING: NO 3 1975
DESIGNATION: 872 7989 TIDAL 3
MONUMENTATION: Tidal Station disk VM#: 8266
AGENCY: National Ocean Survey (NOS) IDB PID#: BD2689
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 30° 7.6' N ( 30.12670) LONGITUDE: 8° 58.4' W ( -8.97333)
The bench mark is a disk set in the top of a concrete monument at the NE
property corner for the Mandalay Lodge, 33 m (108 ft) east of bench mark 2 1975,
6.71 m (22.0 ft) west of the center line of the dirt road, and 4.57 m (15.0 ft)
east of a palm tree, and 3 cm (0.1 ft) above ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8727989 PUBLICATION DATE: 02/05/2004
Name: AUCILLA RIVER
FL
NOAA Chart: 11405 Latitude: 30° 7.6' N ( 30.12670)
USGS Quad: NUTALL RISE Longitude: 83° 58.5' W ( -83.97500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 4 1975
DESIGNATION: 872 7989 TIDAL 4
MONUMENTATION: Tidal Station disk VM#: 8267
AGENCY: National Ocean Survey (NOS) IDB PID#: BD2692
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 30° 7.5' N ( 30.12500) LONGITUDE: 8° 58.4' W ( -8.97333)
The bench mark is a disk set in the top of a concrete monument at the SE
property corner for the Mandalay Lodge, 41.76 m (137.0 ft) east of bench mark 5
1975, 10.67 m (35.0 ft) south of a palm tree, 5.18 m (17.0 ft) west of a the
centerline of the dirt road, 6 cm (0.2 ft) north of a fence, and at ground
level.
BENCH MARK STAMPING: NO 5 1975
DESIGNATION: 872 7989 TIDAL 5
MONUMENTATION: Tidal Station disk VM#: 8268
AGENCY: National Ocean Survey (NOS) IDB PID#: BD2693
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 30° 7.6' N ( 30.12670) LONGITUDE: 8° 58.5' W ( -8.97500)
The bench mark is a disk set in the top of a concrete monument cemented to a
boulder along the shore south of the boat house, 41.76 m (137.0 ft) west of
bench mark 4 1975, 7.62 m (25.0 ft) east of the river bank, 6.71 m (22.0 ft) SW
of an oak tree, 5.18 m (17.0 ft) NW of the NW corner of a house on concrete
block pilings, 3 m (10 ft) east of the SW property corner for the Mandalay
Lodge, 3 m (10 ft) south of a cedar tree, 0.06 m (0.2 ft) north of a fence, and
at ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8727989 PUBLICATION DATE: 02/05/2004
Name: AUCILLA RIVER
FL
NOAA Chart: 11405 Latitude: 30° 7.6' N ( 30.12670)
USGS Quad: NUTALL RISE Longitude: 83° 58.5' W ( -83.97500)
T I D A L D A T U M S
Tidal datums at AUCILLA RIVER based on:
LENGTH OF SERIES: 1 YEAR
TIME PERIOD: February 1975 - January 1976
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8727520 CEDAR KEY, GULF OF MEXICO
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (09/23/1975) = 1.492
MEAN HIGHER HIGH WATER MHHW = 0.752
MEAN HIGH WATER MHW = 0.687
MEAN TIDE LEVEL MTL = 0.395
MEAN SEA LEVEL MSL = 0.369
North American Vertical Datum NAVD88 = 0.173
MEAN LOW WATER MLW = 0.103
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (12/21/1975) = -0.407
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
NO 1 1975 1.659 0.972
NO 2 1975 1.111 0.424
NO 3 1975 1.410 0.723
NO 4 1975 1.515 0.828
NO 5 1975 0.911 0.224
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8727989 PUBLICATION DATE: 02/05/2004
Name: AUCILLA RIVER
FL
NOAA Chart: 11405 Latitude: 30° 7.6' N ( 30.12670)
USGS Quad: NUTALL RISE Longitude: 83° 58.5' W ( -83.97500)
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.