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Datums Page Page 1 of 13
Station ID: 8727520 PUBLICATION DATE: 08/28/2018
Name: CEDAR KEY, GULF OF MEXICO
FL
NOAA Chart: 11408 Latitude: 29° 8.0' N ( 29.13361)
USGS Quad: CEDAR KEY Longitude: 83° 1.9' W ( -83.03089)
To reach the tidal bench marks from the Post Office at Second Avenue and C
Street in Cedar Key, proceed SE on C Street for 0.03 km (0.2 mi) to Levy County
Pier. The bench marks are in the area between the Fish House and G Street going
east/west and between Whiddon Street and the county pier going north/south. The
tide gauge is located at the end of the Cedar Key Fishing Pier.
T I D A L B E N C H M A R K S
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 13
Station ID: 8727520 PUBLICATION DATE: 08/28/2018
Name: CEDAR KEY, GULF OF MEXICO
FL
NOAA Chart: 11408 Latitude: 29° 8.0' N ( 29.13361)
USGS Quad: CEDAR KEY Longitude: 83° 1.9' W ( -83.03089)
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: PARK 1989
DESIGNATION: PARK
MONUMENTATION: Flange-encased Rod VM#: 16508
AGENCY: National Geodetic Survey (NGS) IDB PID#: AR1851
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID#: AR1851
LATITUDE: 29° 8.3' N ( 29.13753) LONGITUDE: 83° 1.8' W ( -83.02964)
The bench mark is a flanged-encased rod located, 28.90 m (94.82 ft) SSW of a
utility pole with light and transformer in the NW angle of the junction of
Second Street and Depot Street, 21.34 m (70.01 ft) WSW of the W edge of a
sidewalk, 18.96 m (62.20 ft) E of a palm tree, 18.90 m (62.01 ft) NNW of the NE
corner of a picnic shelter, 12.22 m (40.09 ft) WNW of the NW corner of the
restrooms building, and 10.45 m (34.28 ft) SSE of the S curb of Second Street.
The datum point is 9 cm (0.3 ft) below ground level, being the top of a
stainless steel rod driven 20.8 m (68.2 ft) to refusal, and encased inside a
sleeve extending 0.91 m (2.99 ft) and encased in a NGS logo cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 13
Station ID: 8727520 PUBLICATION DATE: 08/28/2018
Name: CEDAR KEY, GULF OF MEXICO
FL
NOAA Chart: 11408 Latitude: 29° 8.0' N ( 29.13361)
USGS Quad: CEDAR KEY Longitude: 83° 1.9' W ( -83.03089)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8
DESIGNATION: TIDAL STA 3-60 TIDAL 8
ALIAS: 8 1910
MONUMENTATION: Triangulation Station disk VM#: 751
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AR1204
SETTING CLASSIFICATION: Concrete post OPUS PID:
LATITUDE: 29° 8.2' N ( 29.13694) LONGITUDE: 83° 1.9' W ( -83.03197)
The primary bench mark is a disk set in the top of a concrete-filled terra cotta
pipe, about one-half block NW along C Street from its intersection with Second
Street, 16.31 m (53.51 ft) NE of the center line of C Street, 6.83 m (22.41 ft)
NW of the north corner of the SW portion of a large apartment building, 1.07 m
(3.51 ft) SW of the SW edge of a concrete wall which is 0.61 m (2.00 ft) high,
0.30 m (0.98 ft) below the level of the street, and 0.06 m (0.20 ft) below
ground level.
BENCH MARK STAMPING: 17 1923
DESIGNATION: 872 7520 TIDAL 17
MONUMENTATION: Tidal Station disk VM#: 753
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AR1203
SETTING CLASSIFICATION: Building wall OPUS PID:
LATITUDE: 29° 8.2' N ( 29.13708) LONGITUDE: 83° 1.9' W ( -83.03114)
The bench mark is a disk set vertically in the SW face of the S corner of Island
Hotel (a two-storied yellow stucco building) at the N corner of B and Second
Streets, 5.00 m (16.40 ft) NW of the NW curb of Second Street, 0.76 m (2.49 ft)
NW of the S corner of the building, and 1.22 m (4.00 ft) above the level of the
street.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 13
Station ID: 8727520 PUBLICATION DATE: 08/28/2018
Name: CEDAR KEY, GULF OF MEXICO
FL
NOAA Chart: 11408 Latitude: 29° 8.0' N ( 29.13361)
USGS Quad: CEDAR KEY Longitude: 83° 1.9' W ( -83.03089)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 18 1923
DESIGNATION: 872 7520 TIDAL 18
MONUMENTATION: Tidal Station disk VM#: 754
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AR1211
SETTING CLASSIFICATION: Sidewalk OPUS PID:
LATITUDE: 29° 8.2' N ( 29.13633) LONGITUDE: 83° 1.9' W ( -83.03233)
The bench mark is a disk set on top of an old sidewalk which is partly covered
with dirt, 9.30 m (30.51 ft) SW of the centerline of C Street, 3.02 m (9.91 ft)
SE of the SE curb of Second Street, 4.00 m (13.12 ft) N of the N corner of a
small white house, about level with the street and 0.06 m (0.20 ft) underground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 13
Station ID: 8727520 PUBLICATION DATE: 08/28/2018
Name: CEDAR KEY, GULF OF MEXICO
FL
NOAA Chart: 11408 Latitude: 29° 8.0' N ( 29.13361)
USGS Quad: CEDAR KEY Longitude: 83° 1.9' W ( -83.03089)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: D 280
DESIGNATION: D 280
MONUMENTATION: Survey disk VM#: 756
AGENCY: Florida Department of Transportation
(FLDT) IDB PID#: AR1210
SETTING CLASSIFICATION: Bridge curb OPUS PID:
LATITUDE: 29° 8.1' N ( 29.13528) LONGITUDE: 83° 1.9' W ( -83.03169)
The bench mark is a disk set on the top of the concrete guard rail base along
the SW side of the C Street bridge near the city pier, directly over the SW end
of the NW one of two piers, 30.54 m (100.20 ft) SE of the NW end of the bridge,
0.18 m ( 0.59 ft) SW of the SW bridge curb, and 0.3 m (0.98 ft) above the bridge
floor.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 13
Station ID: 8727520 PUBLICATION DATE: 08/28/2018
Name: CEDAR KEY, GULF OF MEXICO
FL
NOAA Chart: 11408 Latitude: 29° 8.0' N ( 29.13361)
USGS Quad: CEDAR KEY Longitude: 83° 1.9' W ( -83.03089)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: D 290
DESIGNATION: D 290
MONUMENTATION: Survey disk VM#: 757
AGENCY: Florida State Road Department (FLSRD) IDB PID#: AR1665
SETTING CLASSIFICATION: Concrete seawall OPUS PID#: AR1665
LATITUDE: 29° 8.2' N ( 29.13592) LONGITUDE: 83° 1.9' W ( -83.03131)
The bench mark is a disk located along First Street, between B Street and C
Street, 27.1 m (89.9 ft) S of the centerline of First Street, and 0.15 m (0.49
ft) E of the W end of the seawall along the N side of a tidal basin.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 13
Station ID: 8727520 PUBLICATION DATE: 08/28/2018
Name: CEDAR KEY, GULF OF MEXICO
FL
NOAA Chart: 11408 Latitude: 29° 8.0' N ( 29.13361)
USGS Quad: CEDAR KEY Longitude: 83° 1.9' W ( -83.03089)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: TANK 1933
DESIGNATION: TANK
MONUMENTATION: Triangulation Station disk VM#: 758
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AR1218
SETTING CLASSIFICATION: Concrete post OPUS PID:
LATITUDE: 29° 8.3' N ( 29.13903) LONGITUDE: 83° 2.3' W ( -83.03856)
The bench mark is a disk set in the top of a concrete post under the NW edge of
the city water tank, 12.65 m (41.50 ft) SW of the SW curb of G street, 5.00 m
(16.40 ft) NNW of the pipe in the center of the tank, 4.00 m (13.12 ft) S of the
SW corner of the concrete base for the N leg of the water tank, 0.67 m (2.20 ft)
W of a metal witness post, 1.22 m (4.00 ft) above the level of the street, and
0.03 m (0.10 ft) above ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 8 of 13
Station ID: 8727520 PUBLICATION DATE: 08/28/2018
Name: CEDAR KEY, GULF OF MEXICO
FL
NOAA Chart: 11408 Latitude: 29° 8.0' N ( 29.13361)
USGS Quad: CEDAR KEY Longitude: 83° 1.9' W ( -83.03089)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: TANK NO 3 1933
DESIGNATION: TANK RM 3
MONUMENTATION: Reference Mark disk VM#: 759
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AR1219
SETTING CLASSIFICATION: Concrete post OPUS PID:
LATITUDE: 29° 8.3' N ( 29.13908) LONGITUDE: 83° 2.3' W ( -83.03861)
The bench mark is a disk set in the top of a concrete post at the city water
tank, 12.80 m (41.99 ft) SW of the SW curb of G street, 8.69 m (28.51 ft) N of
the NW corner of the concrete base of the W leg of the water tower, 1.22 m (4.00
ft) above the level of the street, and 0.06 m (0.20 ft) above ground level.
BENCH MARK STAMPING: 7520 K 1978
DESIGNATION: 872 7520 K TIDAL
MONUMENTATION: Tidal Station disk VM#: 760
AGENCY: National Ocean Survey (NOS) IDB PID#: AR1666
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 29° 8.2' N ( 29.13608) LONGITUDE: 83° 2.1' W ( -83.03506)
The bench mark is a disk set 40.00 m (131.23 ft) W of the centerline of E
Street, 5.76 m (18.90 ft) NNW of the NW corner of the Southern bell telephone
company building, 5.03 m (16.50 ft) SW of a manhole cover, and 1.49 m (4.89 ft)
S of the N end of a retaining wall. The bench mark is 5 cm above ground level,
crimped to a stainless steel rod driven 11.00 m (36.09 ft) to refusal (NO PVC
kickblock).
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 9 of 13
Station ID: 8727520 PUBLICATION DATE: 08/28/2018
Name: CEDAR KEY, GULF OF MEXICO
FL
NOAA Chart: 11408 Latitude: 29° 8.0' N ( 29.13361)
USGS Quad: CEDAR KEY Longitude: 83° 1.9' W ( -83.03089)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING:
DESIGNATION: FDNR 1
ALIAS: FDNR 1
MONUMENTATION: Bench Mark disk VM#: 18252
AGENCY: FDNR IDB PID:
SETTING CLASSIFICATION: Bridge Curbing OPUS PID:
LATITUDE: 29° 8.1' N ( 29.13444) LONGITUDE: 83° 1.9' W ( -83.03094)
The bench mark is a disk set on the top of the concrete gurad rail base along
the south side of Dock Street near the foot of the city pier, 32.90 m (107.94
ft) east of the western handrail of the bridge on C Street, 21.80 m (71.52 ft)
SE of the end of the cone handrail of the southern sidewalk at the western end
of Dock Street, 9.00 m (29.53 ft) NE of the end of cone handrail at the edge of
exit pier, 6.10 m (20.01 ft) SE of the center line of Dock Street, 0.80 m (2.62
ft) NW of the handrail and seawall.
BENCH MARK STAMPING: 7520 L 2010
DESIGNATION: 872 7520 L
MONUMENTATION: Flange-encased Rod VM#: 19824
AGENCY: National Ocean Survey/Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID:
LATITUDE: 29° 8.2' N ( 29.13639) LONGITUDE: 83° 1.8' W ( -83.03025)
The bench mark is a flange encased rod, 135 FT WNW of the West edge of the small
craft public boat ramp, 112.5 FT (34.3 M) from the flag pole near the small
craft public boat ramp, 104 FT (31.7 M) SE of the SE side of the telephone pole
number 540, 79 FT SW of the center line of First Street, 10 FT (3.0 M) NW of the
NW side of the sea wall. The datum point is set 6 inches below ground level, on
a stainless steel rod driven 24.7 M to refusal, and encased in a 5-inch (13 cm)
National Geodetic Survey Logo Cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 10 of 13
Station ID: 8727520 PUBLICATION DATE: 08/28/2018
Name: CEDAR KEY, GULF OF MEXICO
FL
NOAA Chart: 11408 Latitude: 29° 8.0' N ( 29.13361)
USGS Quad: CEDAR KEY Longitude: 83° 1.9' W ( -83.03089)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7250 M 2017
DESIGNATION: 872 7520 M
MONUMENTATION: Flange-encased Rod VM#: 22207
AGENCY: National Ocean Survey/Service (NOS) IDB PID:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID:
LATITUDE: 29° 8.3' N ( 29.13886) LONGITUDE: 83° 2.3' W ( -83.03847)
The bench mark is a stainless steel rod driven 22.4 m (73.5 ft) to refusal set
in a 14 cm (6 inch) PVC pipe with a concrete kick block, located 16.1 m (4.9 ft)
WSW of the centerline of G St, 7.16 m (2.2 ft) ENE of a fire hydrant, 6.6 m
(2.0 ft) SSE of the most NE leg of the water tower, 6.6 m (2.0 ft) NNW of the
center of Eighth St, 1.8 m (0.5 ft) SSE of the chain link fence.
BENCH MARK STAMPING: 7520 N 2017
DESIGNATION: 872 7520 N
MONUMENTATION: Bench Mark disk VM#: 22208
AGENCY: National Ocean Survey/Service (NOS) IDB PID:
SETTING CLASSIFICATION: Concrete pier OPUS PID:
LATITUDE: 29° 8.0' N ( 29.13381) LONGITUDE: 83° 1.9' W ( -83.03089)
The bench mark is a surface disc set flush into the concrete fishing pier
located 10.83 m (3.3 ft) north of the southern most hand rail on the concrete
fishing pier, 9.71 m (3.0 ft) west of the eastern metal hand rail on the
concrete fishing pier, 7.62 m (2.3 ft) south of a light pole surrounded by four
benches near the center of the fishing pier, 2.65 m (0.8 ft) east of the western
metal hand rail on the fishing pier.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 11 of 13
Station ID: 8727520 PUBLICATION DATE: 08/28/2018
Name: CEDAR KEY, GULF OF MEXICO
FL
NOAA Chart: 11408 Latitude: 29° 8.0' N ( 29.13361)
USGS Quad: CEDAR KEY Longitude: 83° 1.9' W ( -83.03089)
T I D A L D A T U M S
Tidal datums at CEDAR KEY, GULF OF MEXICO based on:
LENGTH OF SERIES: 16 YEARS
TIME PERIOD: Jan 83 - Dec 87, Jan 89 - Dec 94, Jan 97 - Dec 01
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8726520 ST. PETERSBURG, TAMPA BAY
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (09/02/2016) = 2.981
MEAN HIGHER HIGH WATER MHHW = 1.158
MEAN HIGH WATER MHW = 1.055
North American Vertical Datum NAVD88 = 0.687
MEAN TIDE LEVEL MTL = 0.624
MEAN SEA LEVEL MSL = 0.621
MEAN LOW WATER MLW = 0.193
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (09/11/2017) = -1.714
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
PARK 1989 2.445 1.390
8 1.797 0.742
17 1923 4.999 3.944
18 1923 2.219 1.164
D 280 4.110 3.055
D 290 2.060 1.005
TANK 1933 7.644 6.589
TANK NO 3 1933 7.437 6.382
7520 K 1978 7.033 5.978
FDNR 1 3.089 2.034
7520 L 2010 2.039 0.984
7250 M 2017 7.810 6.755
7520 N 2017 4.625 3.570
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 12 of 13
Station ID: 8727520 PUBLICATION DATE: 08/28/2018
Name: CEDAR KEY, GULF OF MEXICO
FL
NOAA Chart: 11408 Latitude: 29° 8.0' N ( 29.13361)
USGS Quad: CEDAR KEY Longitude: 83° 1.9' W ( -83.03089)
Foot Notes:
Bench marks 7250 M 2017 and 7520 N 2017 are based on one differential leveling
connection and do not meet the quality control standards of the NOS. Therefore,
caution should be used when deriving elevations for these marks.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 13 of 13
Station ID: 8727520 PUBLICATION DATE: 08/28/2018
Name: CEDAR KEY, GULF OF MEXICO
FL
NOAA Chart: 11408 Latitude: 29° 8.0' N ( 29.13361)
USGS Quad: CEDAR KEY Longitude: 83° 1.9' W ( -83.03089)
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.