U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
PUBLICATION DATE: 07/30/1999
Station ID: 8720357 SUPERCEDED DATE: 04/21/2003
Name: I-295 BRIDGE, WEST END, ST JOHNS RIVER
FLORIDA
NOAA Chart: 11492 Latitude: 30° 11.5' N
USGS Quad: ORANGE PARK Longitude: 81° 41.5' W
To reach the tidal bench marks from the I-295 overpass over US Highway 17 north
of Orange Park, proceed north on Highway 17 for 0.56 km (0.35 mi) to the
junction of US Highway 17 and Collins Road, turn right onto Collins Road and go
east for 0.3 km (0.2 mi) to a 90 degree turn to the right, continue for 2.4 km
(1.5 mi) to a 90 degree turn to the left, and continue on Collins Road for 1.1
km (0.7 mi) to its intersection with Malaga Avenue, then go south on Malaga
Avenue for 0.08 km (0.05 mi) to the entrance of the Jacksonville Rudder Club on
the left, then go east for 0.08 km (0.05 mi) to the boat ramp and pier. The
bench marks are in the vicinity of the club and along Collins Avenue. The tide
gage was located at the NE corner of the wooden pier at the club.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 0357 B 1995
DESIGNATION: 872 0357 B
MONUMENTATION: Metal Rod VM#: 13480
AGENCY: National Ocean Service (NOS) PID#: DL5349
SETTING CLASSIFICATION: Stainless steel rod
The primary bench mark is a metal rod set near the Jacksonville Rudder Club
pool, 34.75 m (114.0 ft) SSW of the approximate center of the boat ramp, 12.04 m
(39.5 ft) SE of the SE corner of the pool deck, 0.67 m (2.2 ft) north of the
south face of the retaining wall, and 0.61 m (2.0 ft) west of the east face of
the wall. The datum point is 9.1 cm (0.3 ft) below the level of the logo cap,
being the top of a stainless steel rod driven 7.1 m (23 ft) to refusal, encased
in a 5-inch logo cap which is at ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
PUBLICATION DATE: 07/30/1999
Station ID: 8720357 SUPERCEDED DATE: 04/21/2003
Name: I-295 BRIDGE, WEST END, ST JOHNS RIVER
FLORIDA
NOAA Chart: 11492 Latitude: 30° 11.5' N
USGS Quad: ORANGE PARK Longitude: 81° 41.5' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 0357 A 1995
DESIGNATION: 872 0357 A
MONUMENTATION: Metal Rod VM#: 13481
AGENCY: National Ocean Service (NOS) PID#: DI9225
SETTING CLASSIFICATION: Stainless steel rod
The bench mark is a metal rod set near the foot of the pier at the Jacksonville
Rudder Club, 29.44 m (96.6 ft) north of the approximate center of the boat ramp,
8.60 m (28.2 ft) north of the pier, 5.15 m (16.9 ft) east of the NE corner of a
tin shed, and 0.73 m (2.4 ft) SW of the NE corner of the bulkhead. The datum
point is 9.1 cm (0.3 ft) below the level of the logo cap, being the top of a
stainless steel rod driven 13.7 m (45.0 ft) to refusal, encased in a 5-inch logo
cap which is at ground level.
BENCH MARK STAMPING: 0357 C 1995
DESIGNATION: 872 0357 C
MONUMENTATION: Bench Mark disk VM#: 13482
AGENCY: National Ocean Service (NOS) PID#: DL5348
SETTING CLASSIFICATION: Concrete monument
The bench mark is a disk set in top of a concrete monument at the entrance to
the Jacksonville Rudder Club, 21.95 m (72.0 ft) south of the approximate
centerline of the entrance drive, 7.80 m (25.6 ft) east of the approximate
centerline of Malaga Avenue, 3.41 m (11.2 ft) north of power pole No. 8539, 0.70
m (2.3 ft) west of a chainlink fence and witness post, and at ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
PUBLICATION DATE: 07/30/1999
Station ID: 8720357 SUPERCEDED DATE: 04/21/2003
Name: I-295 BRIDGE, WEST END, ST JOHNS RIVER
FLORIDA
NOAA Chart: 11492 Latitude: 30° 11.5' N
USGS Quad: ORANGE PARK Longitude: 81° 41.5' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 0357 D 1995
DESIGNATION: 872 0357 D
MONUMENTATION: Bench Mark disk VM#: 13483
AGENCY: National Ocean Service (NOS) PID#: DL5347
SETTING CLASSIFICATION: Concrete monument
The bench mark is a disk set in top of a concrete monument at the intersection
of Collins Road and Malaga Avenue, 11.73 m (38.5 ft) south of the centerline of
Collins Road, 9.45 m (31.0 ft) east of the centerline of Malaga Avenue, 0.76 m
(2.5 ft) SW of the north corner of a chainlink fence, 0.46 m (1.5 ft) west of a
witness post, and at ground level.
BENCH MARK STAMPING: 0357 E 1995
DESIGNATION: 872 0357 E
MONUMENTATION: Bench Mark disk VM#: 13484
AGENCY: National Ocean Service (NOS) PID#: DL5346
SETTING CLASSIFICATION: Concrete monument
The bench mark is a disk set in top of a concrete monument at the intersection
of Collins Road and New York Avenue, 6.61 m (21.7 ft) north of the centerline of
Collins Road, 5.15 (16.9 ft) west of the centerline of New York Avenue, 3.35 m
(11.0 ft) SE of a 30-inch diameter pine tree, 0.43 m (1.4 ft) south of a street
sign, and at ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
PUBLICATION DATE: 07/30/1999
Station ID: 8720357 SUPERCEDED DATE: 04/21/2003
Name: I-295 BRIDGE, WEST END, ST JOHNS RIVER
FLORIDA
NOAA Chart: 11492 Latitude: 30° 11.5' N
USGS Quad: ORANGE PARK Longitude: 81° 41.5' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 0357 F 1995
DESIGNATION: 872 0357 F
MONUMENTATION: Bench Mark disk VM#: 13485
AGENCY: National Ocean Service (NOS) PID#: DL5345
SETTING CLASSIFICATION: Concrete monument
The bench mark is a disk set in top of a concrete monument at the corner of
Barcelona Avenue and Collins Road, 15.24 m (50.0 ft) SSE of the center point of
Collins Road and Barcelona Avenue, 2.90 m (9.5 ft) SW of a guardrail, 0.40 m
(1.3 ft) NE of a chainlink fence, 0.37 m (1.2 ft) NE of a witness post, and at
ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
PUBLICATION DATE: 07/30/1999
Station ID: 8720357 SUPERCEDED DATE: 04/21/2003
Name: I-295 BRIDGE, WEST END, ST JOHNS RIVER
FLORIDA
NOAA Chart: 11492 Latitude: 30° 11.5' N
USGS Quad: ORANGE PARK Longitude: 81° 41.5' W
T I D A L D A T U M S
Tidal datums at I-295 BRIDGE, WEST END, ST JOHNS RIVER based on:
LENGTH OF SERIES: 3 MONTHS
TIME PERIOD: April 1997 - June 1997
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8720220 MAYPORT
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.300
North American Vertical Datum NAVD88 = 0.286
MEAN HIGH WATER MHW = 0.285
MEAN TIDE LEVEL MTL = 0.155
MEAN SEA LEVEL MSL = 0.154
MEAN LOW WATER MLW = 0.025
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
0357 B 1995 0.952 0.667
0357 A 1995 0.954 0.669
0357 C 1995 4.913 4.628
0357 D 1995 4.762 4.477
0357 E 1995 5.677 5.392
0357 F 1995 7.751 7.466
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
PUBLICATION DATE: 07/30/1999
Station ID: 8720357 SUPERCEDED DATE: 04/21/2003
Name: I-295 BRIDGE, WEST END, ST JOHNS RIVER
FLORIDA
NOAA Chart: 11492 Latitude: 30° 11.5' N
USGS Quad: ORANGE PARK Longitude: 81° 41.5' 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 (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 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.