U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
PUBLICATION DATE: 03/11/1993
Station ID: 8720217 SUPERCEDED DATE: 04/21/2003
Name: MONCRIEF CREEK ENTRANCE, ST. JOHNS RIVER
FLORIDA
NOAA Chart: 11491 Latitude: 30° 23.5' N
USGS Quad: TROUT RIVER Longitude: 81° 39.7' W
To reach the tidal bench marks from the intersection of US #17 and Florida #111
(Edgewood Avenue), proceed 1.1 miles (1.8 km) NW on Edgewood Avenue to the NW
end of the bridge over Moncrief Creek. Bench marks are on the bridge and in the
vicinity of the north bank on Moncrief Creek. The gauge was located 46 feet (14
m) SSE of the north bank of Moncrief Creek at the end of a series of four
catwalks over an abandoned steel bridge foundation. Tide staff was 16 feet (5
m) NW of the tide gauge.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 0217 A
MONUMENTATION: Survey Disk VM#: 10702
AGENCY: PID#: BC1464
SETTING CLASSIFICATION: Copper-clad Steel Rod
The primary bench mark is 106 feet (32 m) SE of the centerline of Merle Drive,
26 feet (8 m) NE of the centerline of the westbound lane of Edgewood Avenue, 5
feet (2 m) SW of a wooden power pole, and 1 foot (0.3 m) SW of a witness sign.
The bench mark is at road level, crimped to a copper-clad steel rod driven 33
feet (10 m) and encased in a concrete kickblock.
BENCH MARK STAMPING: I95 72 A31
MONUMENTATION: Survey Disk VM#: 10703
AGENCY: PID#: BC1252
SETTING CLASSIFICATION: Concrete Post
The bench mark is set in top of a round concrete post in the median of
Interstate 95 at the north end of the bridge over Edgewood Avenue, 21.9 feet
(6.7 m) east of the centerline of the southbound lane of Interstate 95, 6.2 feet
(1.9 m) NE of a concrete guardrail, 3.0 feet (0.9 m) east of a metal guardrail,
2.1 feet (0.6 m) SW of a witness sign, and 0.1 foot (0.03 m) below ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
PUBLICATION DATE: 03/11/1993
Station ID: 8720217 SUPERCEDED DATE: 04/21/2003
Name: MONCRIEF CREEK ENTRANCE, ST. JOHNS RIVER
FLORIDA
NOAA Chart: 11491 Latitude: 30° 23.5' N
USGS Quad: TROUT RIVER Longitude: 81° 39.7' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: I95 72 A31 RM1
MONUMENTATION: Survey Disk VM#: 10704
AGENCY: PID#: BC1250
SETTING CLASSIFICATION: Concrete Guardrail
The bench mark is set in top of the concrete guardrail at the NW corner of the
northbound bridge of Interstate 95 over Edgewood Avenue and 16.6 feet (5.1 m)
west of the centerline of the northbound lane of Interstate 95.
BENCH MARK STAMPING: I95 72 A31 RM2
MONUMENTATION: Survey Disk VM#: 10705
AGENCY: PID#: BC1251
SETTING CLASSIFICATION: Concrete Guardrail
The bench mark is set in top of the concrete guardrail at the NE corner of the
southbound bridge of Interstate 95 over Edgewood Avenue and 17.6 feet (5.4 m)
east of the centerline of the southbound lane of Interstate 95.
BENCH MARK STAMPING: I95 G7
MONUMENTATION: Survey Disk VM#: 10706
AGENCY: PID#: BC1256
SETTING CLASSIFICATION: Concrete Curb
The bench mark is set in the concrete curb at the NW corner of Edgewood Avenue
Bridge over Moncrief Creek, 18.7 feet (5.7 m) SW of the centerline of Edgewood
Avenues eastbound lane, 6.0 (1.8 m) feet SE of the NW end of the concrete curb,
and 4.0 feet (1.2 m) SW of the edge of the curb.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
PUBLICATION DATE: 03/11/1993
Station ID: 8720217 SUPERCEDED DATE: 04/21/2003
Name: MONCRIEF CREEK ENTRANCE, ST. JOHNS RIVER
FLORIDA
NOAA Chart: 11491 Latitude: 30° 23.5' N
USGS Quad: TROUT RIVER Longitude: 81° 39.7' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: I95 H7
MONUMENTATION: Survey Disk VM#: 10707
AGENCY: PID#: BC1257
SETTING CLASSIFICATION: Concrete Curb
The bench mark is set in the concrete curb at the SE corner of the Edgewood
Avenue Bridge over Moncrief Creek, 19.0 (5.8 m) feet NE of the westbound lane of
Edgewood Avenue, 6.0 feet (1.8 m) NW of the SE end of the concrete curb, and 4.0
feet (1.2 m) NE of the edge of the curb.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
PUBLICATION DATE: 03/11/1993
Station ID: 8720217 SUPERCEDED DATE: 04/21/2003
Name: MONCRIEF CREEK ENTRANCE, ST. JOHNS RIVER
FLORIDA
NOAA Chart: 11491 Latitude: 30° 23.5' N
USGS Quad: TROUT RIVER Longitude: 81° 39.7' W
T I D A L D A T U M S
Tidal datums at MONCRIEF CREEK ENTRANCE, ST. JOHNS RIVER based on:
LENGTH OF SERIES: 3 MONTHS
TIME PERIOD: OCTOBER-DECEMBER 1977
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 (11/02/1977) = 3.77
MEAN HIGHER HIGH WATER MHHW = 2.76
MEAN HIGH WATER MHW = 2.65
MEAN TIDE LEVEL MTL = 1.37
MEAN LOW WATER MLW = 0.09
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (12/26/1977) = -0.73
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
0217 A 8.50 5.85
I95 72 A31 34.64 31.99
I95 72 A31 RM1 36.47 33.82
I95 72 A31 RM2 36.49 33.84
I95 G7 12.78 10.13
I95 H7 20.93 18.28
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
PUBLICATION DATE: 03/11/1993
Station ID: 8720217 SUPERCEDED DATE: 04/21/2003
Name: MONCRIEF CREEK ENTRANCE, ST. JOHNS RIVER
FLORIDA
NOAA Chart: 11491 Latitude: 30° 23.5' N
USGS Quad: TROUT RIVER Longitude: 81° 39.7' 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 (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.