U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 1 of 5
Station ID: 8727991 PUBLICATION DATE: 02/23/1989
Name: GREEN POINT, AUCILLA RIVER, APALACHEE BAY
FLORIDA
NOAA Chart: 11405 Latitude: 30ø 3.9' N
USGS Quad: SNIPE ISLAND Longitude: 83ø 58.1' W
To reach the tidal bench marks from the mouth of Aucilla River, proceed by boat
SE for 1.6 statute miles (2.6 km) to Rose Creek. The bench marks are at the
mouth of Rose Creek and at the headwaters of Snipe Creek. The tide gage and
staff were located offshore, SW of the point of the land that forms the west
end of the north bank of Rose Creek.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 300833 AA1 1975
MONUMENTATION: Survey Disk VM#: 8272
AGENCY: PID:
SETTING CLASSIFICATION: Copper-clad Steel Rod
The bench mark is on the NW end of a palm island south of the main channel of
Snipe Creek, 0.3 mile (0.5 km) SW of the tree line, 85 feet (26 m) west of
Bench Mark 300833 AA2 1975, and 25 feet (8 m) south of the creek. The bench
mark is crimped to a copper-clad steel rod driven an unspecified depth to
refusal, and encased in a 4-inch PVC pipe and concrete kickblock.
BENCH MARK STAMPING: SNIPE ERDL 1960
MONUMENTATION: Survey Disk VM#: 8269
AGENCY: PID#: BD2499
SETTING CLASSIFICATION: Concrete Monument
The bench mark is set in a concrete monument near the head of Snipe Creek, at
the end of a sand road on the property of St. Joe Paper Company, 45 feet (14
m) west of a pole hog pen, 17.5 feet (5.3 m) SW of an oak tree with a triangle
blaze, 16 feet (5 m) south of an oak tree, 2 feet (1 m) east of a witness
marker, and 0.2 foot (0.1 m) above the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8727991 PUBLICATION DATE: 02/23/1989
Name: GREEN POINT, AUCILLA RIVER, APALACHEE BAY
FLORIDA
NOAA Chart: 11405 Latitude: 30ø 3.9' N
USGS Quad: SNIPE ISLAND Longitude: 83ø 58.1' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: SNIPE ERDL NO 1 1960
MONUMENTATION: Survey Disk VM#: 8270
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Monument
The bench mark is set in a concrete monument near the head of Snipe Creek, at
the end of a sand road on the property of St. Joe Paper Company, 18 feet (5 m)
SE of the centerline of the road, 17 feet (5 m) north of a loading ramp, 4 feet
(1 m) NW of a twin oak tree, and 0.2 foot (0.1 m) above the ground.
BENCH MARK STAMPING: SNIPE ERDL NO 2 1960
MONUMENTATION: Survey Disk VM#: 8271
AGENCY: PID#: BD2498
SETTING CLASSIFICATION: Concrete Monument
The bench mark is set in a concrete monument near the head of Snipe Creek, at
the end of a sand road on the property of St. Joe Paper Company, 70 feet (21
m) SW of a palm tree, 57 feet (17 m) south of a palm tree, and 0.3 foot (0.1 m)
above the ground.
BENCH MARK STAMPING: 300833 AA2 1975
MONUMENTATION: Survey Disk VM#: 8273
AGENCY: PID:
SETTING CLASSIFICATION: Copper-clad Steel Rod
The bench mark is on the NW side of the palm island south of the main channel of
Snipe Creek, 0.3 mile (0.5 km) SW of the tree line, 85 feet (26 m) east of
Bench Mark 300833 AA1 1975, and 45 feet (14 m) south of the creek. The bench
mark is crimped to a copper-clad steel rod driven an unspecified depth to
refusal, and encased in a 4-inch PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8727991 PUBLICATION DATE: 02/23/1989
Name: GREEN POINT, AUCILLA RIVER, APALACHEE BAY
FLORIDA
NOAA Chart: 11405 Latitude: 30ø 3.9' N
USGS Quad: SNIPE ISLAND Longitude: 83ø 58.1' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: BM 31 1975
MONUMENTATION: Brass Cap VM#: 8274
AGENCY: PID:
SETTING CLASSIFICATION: Copper-clad Steel Rod
The bench mark is in the SW corner of the marshy land that forms the west end of
the north bank of Rose Creek, 113 feet (34 m) NW of Bench Mark BM 32 1975. The
bench mark is crimped to a copper-clad steel rod driven an unspecified depth to
refusal, and encased in a 3-inch PVC pipe and concrete kickblock.
BENCH MARK STAMPING: BM 32 1975
MONUMENTATION: Brass Cap VM#: 8275
AGENCY: PID:
SETTING CLASSIFICATION: Copper-clad Steel Rod
The bench mark is in the SW corner of the marshy land that forms the west end of
the north bank of Rose Creek, 113 feet (34 m) SE of Bench Mark BM 31 1975. The
bench mark is crimped to a copper-clad steel rod driven an unspecified depth to
refusal, and encased in a 3-inch PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8727991 PUBLICATION DATE: 02/23/1989
Name: GREEN POINT, AUCILLA RIVER, APALACHEE BAY
FLORIDA
NOAA Chart: 11405 Latitude: 30ø 3.9' N
USGS Quad: SNIPE ISLAND Longitude: 83ø 58.1' W
T I D A L D A T U M S
Tidal datums at GREEN POINT, AUCILLA RIVER, APALACHEE BAY based on:
LENGTH OF SERIES: 2 MONTHS
TIME PERIOD: SEPTEMBER 1976,JULY 1977
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8727520 CEDAR KEY
Elevations of tidal datums referred to Mean High Water (MHW), in FEET:
HIGHEST OBSERVED WATER LEVEL (09/27/1976) = 1.35
MEAN HIGHER HIGH WATER (MHHW) = 0.25
MEAN HIGH WATER (MHW) = 0.00
Bench Mark Elevation Information In FEET above:
Stamping or Designation MHW
300833 AA1 1975 1.68
SNIPE ERDL 1960 1.67
SNIPE ERDL NO 1 1960 2.77
SNIPE ERDL NO 2 1960 0.30
300833 AA2 1975 1.95
BM 31 1975 0.67
BM 32 1975 1.08
Foot Notes:
NOTE: The datums were computed by the NOS Direct Method due to flat low
waters.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8727991 PUBLICATION DATE: 02/23/1989
Name: GREEN POINT, AUCILLA RIVER, APALACHEE BAY
FLORIDA
NOAA Chart: 11405 Latitude: 30ø 3.9' N
USGS Quad: SNIPE ISLAND Longitude: 83ø 58.1' 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.