U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
PUBLICATION DATE: 01/25/1988
Station ID: 8720213 SUPERCEDED DATE: 04/21/2003
Name: SHERWOOD FOREST, TROUT RIVER
FLORIDA
NOAA Chart: 0 Latitude: 30° 25.2' N
USGS Quad: TROUT RIVER Longitude: 81° 43.7' W
To reach the tidal bench marks from the intersection of Edgewood Avenue and Lem
Turner Road in Jacksonville, proceed north along Lem Turner Road for 2.0 miles
(3.2 km), then west on Trout River Boulevard for 2.0 miles (3.2 km) to 5339
Trout River Boulevard. The bench marks are located along Trout River Boulevard
and Sibbald Avenue. The tide gage and staff were located on a private dock
behind the residence at 5339 Trout River Boulevard.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 0213 C 1978
MONUMENTATION: Survey Disk VM#: 5090
AGENCY: PID#: BC2480
SETTING CLASSIFICATION: Concrete Bridge Abutment
The bench mark is set in a 1 x 2 foot (0.3 x 1 m) concrete port on the SE corner
of the Trout River Boulevard bridge over Nine Mile Creek, 20.4 feet (6.2 m)
south of the centerline of Trout River Boulevard, 6 feet (2 m) west of a witness
post, and 1.3 feet (0.4 m) south of the bridge railing.
BENCH MARK STAMPING: 0213 A 1978
MONUMENTATION: Survey Disk VM#: 5088
AGENCY: PID#: BC2481
SETTING CLASSIFICATION: Concrete Monument
The bench mark is set in a concrete monument, 365 feet (111 m) north of Trout
River Boulevard, 120 feet (37 m) north of a tin shed behind the residence at
5339 Trout River Boulevard, 65 feet (20 m) south of the south shoreline of the
Trout River, and 59 feet (18 m) SW of a dock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
PUBLICATION DATE: 01/25/1988
Station ID: 8720213 SUPERCEDED DATE: 04/21/2003
Name: SHERWOOD FOREST, TROUT RIVER
FLORIDA
NOAA Chart: 0 Latitude: 30° 25.2' N
USGS Quad: TROUT RIVER Longitude: 81° 43.7' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 0213 B 1978
MONUMENTATION: Survey Disk VM#: 5089
AGENCY: PID#: BC2479
SETTING CLASSIFICATION: Concrete Monument
The bench mark is set in a concrete monument, 196 feet (60 m) west of the
Wayside Church of God, 76 feet (23 m) south of a large cedar tree, 44 feet (13
m) SW of the intersection of Trout River Boulevard and Sibbald Road, 37.5 feet
(11.4 m) south of the centerline of Trout River Boulevard, 26.6 feet (8.1 m)
west of the centerline of Sibbald Road, and 1 foot (0.3 m) east of a witness
post.
BENCH MARK STAMPING: 0213 D 1978
MONUMENTATION: Survey Disk VM#: 5091
AGENCY: PID#: BC2478
SETTING CLASSIFICATION: Concrete Headwall
The bench mark is set in a concert headwall, 96 feet (29 m) north of the
intersection of Sibbald Road and Gilchrist Road, 40 feet (12 m) east of the
centerline of the south bound lane of Sibbald Road, 20 feet (6 m) west of the
centerline of the north bound lane of Sibbald Road, and 2.5 feet (0.8 m) south
of a witness post.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
PUBLICATION DATE: 01/25/1988
Station ID: 8720213 SUPERCEDED DATE: 04/21/2003
Name: SHERWOOD FOREST, TROUT RIVER
FLORIDA
NOAA Chart: 0 Latitude: 30° 25.2' N
USGS Quad: TROUT RIVER Longitude: 81° 43.7' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 0213 E 1978
MONUMENTATION: Survey Disk VM#: 5092
AGENCY: PID#: BC2477
SETTING CLASSIFICATION: Concrete Headwall
The bench mark is set in a concrete headwall, 0.4 mile (0.6 km) south of the
intersection of Gilchrist Road and New Kings Road (U.S. Highway 1), 61 feet (19
m) west of the median of New Kings Road, 58 feet (18 m) NW of the centerline of
a the NW drive of the Thoni Service Station, 30 feet (9 m) NE of a chain link
fence, and 3 feet (1 m) south of a witness post.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
PUBLICATION DATE: 01/25/1988
Station ID: 8720213 SUPERCEDED DATE: 04/21/2003
Name: SHERWOOD FOREST, TROUT RIVER
FLORIDA
NOAA Chart: 0 Latitude: 30° 25.2' N
USGS Quad: TROUT RIVER Longitude: 81° 43.7' W
T I D A L D A T U M S
Tidal datums at SHERWOOD FOREST, TROUT RIVER based on:
LENGTH OF SERIES: 4 MONTHS
TIME PERIOD: SEPTEMBER-DECEMBER 1978
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8720220 MAYPORT
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (11/03/1978) = 4.07
MEAN HIGHER HIGH WATER (MHHW) = 2.88
MEAN HIGH WATER (MHW) = 2.75
MEAN TIDE LEVEL (MTL) = 1.43
MEAN LOW WATER (MLW) = 0.10
MEAN LOWER LOW WATER (MLLW) = 0.00
LOWEST OBSERVED WATER LEVEL (12/27/1978) = -1.30
National Geodetic Vertical Datum (NGVD 29)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
0213 C 1978 12.96 10.21
0213 A 1978 6.13 3.38
0213 B 1978 7.15 4.40
0213 D 1978 10.60 7.85
0213 E 1978 22.01 19.26
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
PUBLICATION DATE: 01/25/1988
Station ID: 8720213 SUPERCEDED DATE: 04/21/2003
Name: SHERWOOD FOREST, TROUT RIVER
FLORIDA
NOAA Chart: 0 Latitude: 30° 25.2' N
USGS Quad: TROUT RIVER Longitude: 81° 43.7' 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.