U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 8725228 PUBLICATION DATE: 07/20/2011
Name: COCOHATCHEE RIVER, U.S. 41
FL
NOAA Chart: 11426 Latitude: 26° 16.9' N ( 26.28170)
USGS Quad: BONITA SPRINGS Longitude: 81° 48.1' W ( -81.80170)
To reach the tidal bench marks from Bonita Springs, proceed 5.6 km (3.5 mi)
south on old U.S. Highway 41 to new U.S. Highway 41, and continue 1.9 m (1.2 mi)
south to the U.S. Highway 41 Bridge over Cocohatchee River. The bench marks are
in the vicinity of the bridge to the south. The tide gage and staff were
located east of the SE corner of the bridge at the Port-O-Call Motel Dock.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: BMT 57
DESIGNATION: BMT 57
MONUMENTATION: Survey disk VM#: 7853
AGENCY: Local Surveyor (LOCSUR) IDB PID#: AD6299
SETTING CLASSIFICATION: Concrete footing pad OPUS PID:
LATITUDE: 26° 16.9' N ( 26.28170) LONGITUDE: 81° 48.0' W ( -81.80000)
The primary bench mark is a disk set in the concrete pad of a metal storage
building at Port-O-Call Motel, 15 m (50 ft) south of the south bank of the
Cocohatchee River, 12 m (40 ft) east of the NE corner of the 2-story motel
building, 12 m (39 ft) SE of the center of a boat ramp, 2 m (6 ft) north of the
south edge of the concrete pad, and 1 m (3 ft) west of the west side of the
storage building.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 8725228 PUBLICATION DATE: 07/20/2011
Name: COCOHATCHEE RIVER, U.S. 41
FL
NOAA Chart: 11426 Latitude: 26° 16.9' N ( 26.28170)
USGS Quad: BONITA SPRINGS Longitude: 81° 48.1' W ( -81.80170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: G 244 1965
DESIGNATION: G 244
MONUMENTATION: Survey disk VM#: 7849
AGENCY: Florida Highway Department (FLHD) IDB PID#: AD1284
SETTING CLASSIFICATION: Concrete bridge abutment OPUS PID:
LATITUDE: 26° 16.9' N ( 26.28170) LONGITUDE: 81° 48.1' W ( -81.80170)
The bench mark is a disk set in the top of the concrete bridge abutment on the
NW corner of the northbound bridge, 6 m (21 ft) west of the centerline of the
northbound lane. Note: The stamping is weathered and may be mistaken for 6 244
1965 instead of G 244 1965.
BENCH MARK STAMPING: 5228 A 1978
DESIGNATION: 872 5228 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 7850
AGENCY: National Ocean Survey (NOS) IDB PID#: AD6298
SETTING CLASSIFICATION: Concrete box drain OPUS PID:
LATITUDE: 26° 17.0' N ( 26.28330) LONGITUDE: 81° 48.1' W ( -81.80170)
The bench mark is a disk set in the NE corner of a 1 m x 2 m (3 ft x 4 ft)
concrete box drain in the median of U.S. Highway 41, 34 m (113 ft) south of the
south end of the bridge, 10 m (34 ft) east of the centerline of the southbound
lane, 10 m (33 ft) west of the centerline of the northbound lane, and 0.91 m
(3.0 ft) west of a steel guardrail.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 8725228 PUBLICATION DATE: 07/20/2011
Name: COCOHATCHEE RIVER, U.S. 41
FL
NOAA Chart: 11426 Latitude: 26° 16.9' N ( 26.28170)
USGS Quad: BONITA SPRINGS Longitude: 81° 48.1' W ( -81.80170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: BM NO 35 ELEV 12.61
DESIGNATION: 872 5228 TIDAL 35
MONUMENTATION: Survey disk VM#: 7851
AGENCY: Florida Department of Transportation
(FLDT) IDB PID#:
SETTING CLASSIFICATION: Concrete bridge railing OPUS PID:
LATITUDE: 26° 16.9' N ( 26.28170) LONGITUDE: 81° 48.1' W ( -81.80170)
The bench mark is a disk set flush in the top of the concrete bridge railing on
the NW corner of the southbound bridge, about 12 m (40 ft) west of bench mark G
244 1965, 6.86 m (22.5 ft) west of the centerline of the southbound lane, and
0.91 m (3.0 ft) above the highway.
BENCH MARK STAMPING: 35 13.51
DESIGNATION: 35 13.51
MONUMENTATION: Survey disk VM#: 7852
AGENCY: Florida Department of Transportation
(FLDT) IDB PID#: AD6297
SETTING CLASSIFICATION: Concrete bridge railing OPUS PID:
LATITUDE: 26° 17.0' N ( 26.28330) LONGITUDE: 81° 48.1' W ( -81.80170)
The bench mark is a disk set in the top of the concrete bridge railing on the SE
corner of the U.S. Highway 41 southbound bridge, 5.58 m (18.3 ft) east of the
centerline of the south bound lane of the highway, 0.43 m (1.4 ft) north of the
south edge of the bridge, and 0.98 m (3.2 ft) above the road surface.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 8725228 PUBLICATION DATE: 07/20/2011
Name: COCOHATCHEE RIVER, U.S. 41
FL
NOAA Chart: 11426 Latitude: 26° 16.9' N ( 26.28170)
USGS Quad: BONITA SPRINGS Longitude: 81° 48.1' W ( -81.80170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 4 A
DESIGNATION: 4 A
MONUMENTATION: Survey disk VM#: 7854
AGENCY: Florida Highway Division (FLHD) IDB PID#: AD1285
SETTING CLASSIFICATION: Concrete bridge abutment OPUS PID:
LATITUDE: 26° 16.9' N ( 26.28170) LONGITUDE: 81° 48.1' W ( -81.80170)
The bench mark is a disk set in the top of the concrete bridge abutment on the
SE corner of the northbound bridge, 6 m (20 ft) east of the centerline of the
northbound lane, and 0.09 m (0.3 ft) west of the east face of the guardrail.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 8725228 PUBLICATION DATE: 07/20/2011
Name: COCOHATCHEE RIVER, U.S. 41
FL
NOAA Chart: 11426 Latitude: 26° 16.9' N ( 26.28170)
USGS Quad: BONITA SPRINGS Longitude: 81° 48.1' W ( -81.80170)
T I D A L D A T U M S
Tidal datums at COCOHATCHEE RIVER, U.S. 41 based on:
LENGTH OF SERIES: 3 MONTHS
TIME PERIOD: September 1978 - November 1978
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8725235 WIGGINS PASS, INSIDE
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.663
MEAN HIGH WATER MHW = 0.590
North American Vertical Datum NAVD88 = 0.512
MEAN SEA LEVEL MSL = 0.361
MEAN TIDE LEVEL MTL = 0.355
MEAN LOW WATER MLW = 0.120
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
BMT 57 1.798 1.208
G 244 1965 2.876 2.286
5228 A 1978 2.472 1.882
BM NO 35 ELEV 12.61 3.957 3.367
35 13.51 4.231 3.641
4 A 2.890 2.300
Foot Notes:
Bench mark BM NO 35 ELEV 12.61 is based on one differential leveling connection
and does not meet the quality control standards of the NOS. Therefore, caution
should be used when deriving elevations for this mark.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 8725228 PUBLICATION DATE: 07/20/2011
Name: COCOHATCHEE RIVER, U.S. 41
FL
NOAA Chart: 11426 Latitude: 26° 16.9' N ( 26.28170)
USGS Quad: BONITA SPRINGS Longitude: 81° 48.1' W ( -81.80170)
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.