U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8727343 PUBLICATION DATE: 05/20/2004
Name: CRYSTAL RIVER, KINGS BAY
FLORIDA
NOAA Chart: 11409 Latitude: 28° 53.9' N
USGS Quad: CRYSTAL RIVER Longitude: 82° 35.9' W
To reach the tidal bench marks from the City Hall in Crystal River, proceed west
on U.S. Highway 19/98 for 0.08 km (0.05 mi) to the Knox Bait House. The bench
marks are located in the area along U.S. Highway 19/98. The tide gage and staff
were located on the covered wooden dock at the NW corner of the pier at the bait
house.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 7343 B 1978
DESIGNATION: 872 7343 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 7796
AGENCY: National Ocean Survey (NOS) PID#: AL7754
SETTING CLASSIFICATION: Galvanized steel rod
The primary bench mark is a disk located 83 m (273 ft) SW of bench mark 7343 C
1978, 14.78 m (48.5 ft) south of the centerline of U.S. Highway 19/98, 13.72 m
(45.0 ft) east of the centerline of the drive entrance to the parking lot of
Knox Bait House, 11.16 m (36.6 ft) NW of the NW corner of the Old Oyster Bar
Restaurant, and 0.88 m (2.9 ft) south of powerline pole #10098-076007. The
bench mark is crimped to the top of a galvanized steel rod driven 7.3 m (24 ft)
to refusal, and encased in a PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 7343 A 1978
DESIGNATION: 872 7343 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 7795
AGENCY: National Ocean Survey (NOS) PID#: AL7755
SETTING CLASSIFICATION: Concrete walkway
The bench mark is a disk set in a concrete walkway on the east side of the Knox
Bait House, 80 m (262 ft) SW of bench mark 7343 B 1978, 6.10 m (20.0 ft) south
of the NE corner of the building, 5.30 m (17.4 ft) north of the SE corner of the
building, 2.0 m (6.5 ft) west of the edge of the concrete bulkhead, and 0.15 m
(0.5 ft) east of the east side of the building.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8727343 PUBLICATION DATE: 05/20/2004
Name: CRYSTAL RIVER, KINGS BAY
FLORIDA
NOAA Chart: 11409 Latitude: 28° 53.9' N
USGS Quad: CRYSTAL RIVER Longitude: 82° 35.9' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7343 C 1978
DESIGNATION: 872 7343 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 7797
AGENCY: National Ocean Survey (NOS) PID#: AL7753
SETTING CLASSIFICATION: Concrete culvert head wall
The bench mark is a disk set in the top of the east end of a concrete culvert
head wall, 152 m (500 ft) west of bench mark 7343 D 1978, 15.48 m (50.8 ft)
north of the centerline of U.S. Highway 19/98, 12.80 m (42.0 ft) west of the
centerline of 2nd Avenue, 1.16 m (3.8 ft) NE of a lone palm tree, and 0.24 m
(0.8 ft) north of a witness post.
BENCH MARK STAMPING: 7343 D 1978
DESIGNATION: 872 7343 D TIDAL
MONUMENTATION: Tidal Station disk VM#: 7798
AGENCY: National Ocean Survey (NOS) PID#: AL7752
SETTING CLASSIFICATION: Concrete monument
The bench mark is a disk set in the top of a concrete monument, 42 m (138 ft)
west of the SE corner of a shopping center, 33 m (109 ft) south of the SW corner
of the shopping center, 12 m (40 ft) north of the centerline of the highway, 11
m (36 ft) east of the centerline of 1st Avenue, and 0.30 m (1.0 ft) north of
powerline pole #100993-076017 with a witness sign attached.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8727343 PUBLICATION DATE: 05/20/2004
Name: CRYSTAL RIVER, KINGS BAY
FLORIDA
NOAA Chart: 11409 Latitude: 28° 53.9' N
USGS Quad: CRYSTAL RIVER Longitude: 82° 35.9' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 4.200 7 1935
DESIGNATION: 4.200 7
ALIAS: STA 7 1935 EL 4.200
MONUMENTATION: Tidal Station disk VM#: 7799
AGENCY: US Army Corps of Engineers (USE) PID#: AL7268
SETTING CLASSIFICATION: Concrete sidewalk
The bench mark is a disk set in top of a concrete sidewalk, 21 m (69 ft) north
of the centerline of the highway, 6.10 m (20.0 ft) west of the centerline of
Citrus Avenue, 3.20 m (10.5 ft) north of a powerline pole, and 2.74 m (9.0 ft)
east of the Lewis Office Supply building
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8727343 PUBLICATION DATE: 05/20/2004
Name: CRYSTAL RIVER, KINGS BAY
FLORIDA
NOAA Chart: 11409 Latitude: 28° 53.9' N
USGS Quad: CRYSTAL RIVER Longitude: 82° 35.9' W
T I D A L D A T U M S
Tidal datums at CRYSTAL RIVER, KINGS BAY based on:
LENGTH OF SERIES: 3 MONTHS
TIME PERIOD: October 1978 - December 1978
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:
MEAN HIGHER HIGH WATER (MHHW) = 0.712
MEAN HIGH WATER (MHW) = 0.628
NORTH AMERICAN VERTICAL DATUM-1988 (NAVD) = 0.359
MEAN SEA LEVEL (MSL) = 0.356
MEAN TIDE LEVEL (MTL) = 0.354
MEAN LOW WATER (MLW) = 0.080
MEAN LOWER LOW WATER (MLLW) = 0.000
National Geodetic Vertical Datum (NGVD 29)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
7343 B 1978 1.870 1.242
7343 A 1978 1.226 0.598
7343 C 1978 1.599 0.971
7343 D 1978 1.730 1.102
4.200 7 1935 1.382 0.754
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8727343 PUBLICATION DATE: 05/20/2004
Name: CRYSTAL RIVER, KINGS BAY
FLORIDA
NOAA Chart: 11409 Latitude: 28° 53.9' N
USGS Quad: CRYSTAL RIVER Longitude: 82° 35.9' 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 (NAVD 88).
NGVD 29 is a fixed datum adopted as a national standard geodetic reference for
heights but is now considered superseded. NGVD 29 is sometimes referred to as
Sea Level Datum of 1929 or as Mean Sea Level on some early issues of Geological
Survey Topographic Quads. NGVD 29 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 NGVD 29 are available from the National
Geodetic Survey (NGS) data base via the World Wide Web at
National Geodetic Survey.
NAVD 88 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. NAVD 88 replaces NGVD 29 as the national
standard geodetic reference for heights. Bench mark elevations relative to
NAVD 88 are available from NGS through the World Wide Web at
National Geodetic Survey.
NGVD 29 and NAVD 88 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 NAVD 88 elevation is shown on the Elevations of Tidal Datums Table Referred
to MLLW only when two or more of the bench marks listed have NAVD 88 elevations.
The NAVD 88 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, NAVD 88 bench mark elevations computed indirectly from the tidal
datums elevation table may differ slightly from NAVD 88 elevations listed for
each bench mark in the NGS database.