U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 8
Station ID: 8725781 PUBLICATION DATE: 11/13/2003
Name: SHELL CREEK, PEACE RIVER
FL
NOAA Chart: 11426 Latitude: 26° 58.8' N ( 26.98000)
USGS Quad: CLEVELAND Longitude: 81° 57.6' W ( -81.96000)
To reach the tidal bench marks proceed 9.7 km (6.0 mi) NE along U.S. Highway 17
from Punta Gorda to the bridge over Shell Creek. Continue to the first dirt
road leading west to the residence of Richard Sternal, P.O. Box 967. The gage
site was on the private dock and the bench marks are in the near area.
T I D A L B E N C H M A R K S
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 8
Station ID: 8725781 PUBLICATION DATE: 11/13/2003
Name: SHELL CREEK, PEACE RIVER
FL
NOAA Chart: 11426 Latitude: 26° 58.8' N ( 26.98000)
USGS Quad: CLEVELAND Longitude: 81° 57.6' W ( -81.96000)
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: B M 3
DESIGNATION: 872 5781 TIDAL 3
ALIAS: SRD 3
MONUMENTATION: Tidal Station disk VM#: 7063
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AD1489
SETTING CLASSIFICATION: Concrete bridge OPUS PID:
LATITUDE: 26° 58.8' N ( 26.98000) LONGITUDE: 81° 57.5' W ( -81.95830)
The primary bench mark is a disk set into the concrete, at the NW end of the
bridge over Shell Creek, 4.72 m (15.5 ft) west of the centerline of U.S. Highway
17, and 0.3 m (1.0 ft) above road surface.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 8
Station ID: 8725781 PUBLICATION DATE: 11/13/2003
Name: SHELL CREEK, PEACE RIVER
FL
NOAA Chart: 11426 Latitude: 26° 58.8' N ( 26.98000)
USGS Quad: CLEVELAND Longitude: 81° 57.6' W ( -81.96000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5781 B
DESIGNATION: 872 5781 B TIDAL
ALIAS: DOT
MONUMENTATION: Bench Mark disk VM#: 6060
AGENCY: Florida Department of Transportation
(FLDOT) IDB PID#: AD7871
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 26° 58.8' N ( 26.98000) LONGITUDE: 81° 57.6' W ( -81.96000)
The bench mark is a disk 28.80 m (94.5 ft) west of the centerline of U.S.
Highway 17, 2.62 m (8.6 ft) north of the centerline of the dirt driveway leading
to the Richard Sternal dwelling, and at ground level.
BENCH MARK STAMPING: BM 1 1956
DESIGNATION: 872 5781 TIDAL 1
MONUMENTATION: Tidal Station disk VM#: 6061
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AD1491
SETTING CLASSIFICATION: Concrete bridge OPUS PID:
LATITUDE: 26° 58.7' N ( 26.97830) LONGITUDE: 81° 57.5' W ( -81.95830)
The bench mark is a disk set flush into the concrete, at the SE end of the
bridge over Shell Creek, 4.88 m (16.0 ft) east of the centerline of U.S. Highway
17, and 0.30 m (1.0 ft) below road surface,
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 8
Station ID: 8725781 PUBLICATION DATE: 11/13/2003
Name: SHELL CREEK, PEACE RIVER
FL
NOAA Chart: 11426 Latitude: 26° 58.8' N ( 26.98000)
USGS Quad: CLEVELAND Longitude: 81° 57.6' W ( -81.96000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: BM 2 1956
DESIGNATION: 872 5781 TIDAL 2
MONUMENTATION: Tidal Station disk VM#: 6062
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AD1490
SETTING CLASSIFICATION: Concrete bridge OPUS PID:
LATITUDE: 26° 58.8' N ( 26.98000) LONGITUDE: 81° 57.6' W ( -81.96000)
The bench mark is a disk set into the concrete, at the SW end of a 30.48 m
(100.0 ft) long concrete bridge over a branch of Shell Creek just NE of the
Richard Sternal residence, and 4.72 m (15.5 ft) west of the centerline of U.S.
Highway 17.
BENCH MARK STAMPING: BM 1 1984 RESET
DESIGNATION: 872 5781 TIDAL 1 RESET
MONUMENTATION: Bench Mark disk VM#: 6064
AGENCY: National Ocean Service (NOS) IDB PID#: AD7872
SETTING CLASSIFICATION: Concrete boat ramp OPUS PID:
LATITUDE: 26° 58.8' N ( 26.98000) LONGITUDE: 81° 57.6' W ( -81.96000)
The bench mark is a disk set flush in the center of the edge of a concrete boat
ramp, 8.90 m (29.2 ft) east of bench mark BM 1 1956, 8.29 m (27.2 ft) WNW of a
power utility pole, and 4.42 m (14.5 ft) WNW of a witness post. The mark is a
reset mark set by NGS to replace bench mark BM 1 1956.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 8
Station ID: 8725781 PUBLICATION DATE: 11/13/2003
Name: SHELL CREEK, PEACE RIVER
FL
NOAA Chart: 11426 Latitude: 26° 58.8' N ( 26.98000)
USGS Quad: CLEVELAND Longitude: 81° 57.6' W ( -81.96000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: N 260
DESIGNATION: N 260
MONUMENTATION: Survey disk VM#: 6065
AGENCY: National Ocean Service (NOS) IDB PID#: AD1488
SETTING CLASSIFICATION: Concrete head wall OPUS PID:
LATITUDE: 26° 58.4' N ( 26.97330) LONGITUDE: 81° 57.5' W ( -81.95830)
The bench mark is a disk set in the top at the center of the east concrete head
wall of a 2.44 m (8.0 ft) concrete box culvert under the highway, 6.55 m (21.5
ft) east of the center line of the highway, above level with the highway, about
10.62 km (6.6 mi) NE along U.S.Highway 17 from the junction of U.S. Highway 41
at Punta Gorda, and 54.86 m ( 180.0 ft) south of the center of the junction of
U.S. Highway 17 and Riverside Drive, in Section 30, R 24 E, T 40 S.
BENCH MARK STAMPING: BM 2 1984 RESET
DESIGNATION: 872 5781 TIDAL 2 RESET
MONUMENTATION: Bench Mark disk VM#: 6066
AGENCY: National Ocean Service (NOS) IDB PID#: AD7870
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 26° 59.0' N ( 26.98330) LONGITUDE: 81° 57.6' W ( -81.96000)
The bench mark is a disk set in the top of a concrete post flush with the
ground, 22 m (72 ft) SE of bench mark BM 2 1956, 0.67 m (2.2 ft) west of a power
utility pole, and 0.30 m (1 ft) south of a witness post. The mark is a reset
mark set by NGS to replace bench mark BM 2 1956.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 8
Station ID: 8725781 PUBLICATION DATE: 11/13/2003
Name: SHELL CREEK, PEACE RIVER
FL
NOAA Chart: 11426 Latitude: 26° 58.8' N ( 26.98000)
USGS Quad: CLEVELAND Longitude: 81° 57.6' W ( -81.96000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5.249 F24 1933
DESIGNATION: F 24
MONUMENTATION: Bench Mark disk VM#: 16405
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AD1487
SETTING CLASSIFICATION: Concrete post OPUS PID:
LATITUDE: 26° 58.3' N ( 26.97170) LONGITUDE: 81° 57.7' W ( -81.96170)
The bench mark is a disk set in the top of a concrete post projecting 0.06 m
(0.02 ft), about 0.3 m (1 ft) below the level of the track, about 0.4 km (0.25
m) SW of milepost X 932, near the crossing of Riverside Drive, 17.68 m (58.0 ft)
south of the center of the crossing, in Section 26, R 23 E, T 40 S, 17 m (56 ft)
SE of the SE rail, 12.19 m (40.0 ft) SW of the center line of the drive, 0.40 m
(1.3 ft) NE of a metal witness post, and about 0.30 m (1 ft) below the level of
the track.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 8
Station ID: 8725781 PUBLICATION DATE: 11/13/2003
Name: SHELL CREEK, PEACE RIVER
FL
NOAA Chart: 11426 Latitude: 26° 58.8' N ( 26.98000)
USGS Quad: CLEVELAND Longitude: 81° 57.6' W ( -81.96000)
T I D A L D A T U M S
Tidal datums at SHELL CREEK, PEACE RIVER based on:
LENGTH OF SERIES: 4 MONTHS
TIME PERIOD: April 1978 - July 1978
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8725110 NAPLES, GULF OF MEXICO
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.668
MEAN HIGH WATER MHW = 0.570
North American Vertical Datum NAVD88 = 0.472
MEAN SEA LEVEL MSL = 0.352
MEAN TIDE LEVEL MTL = 0.347
MEAN LOW WATER MLW = 0.125
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
B M 3 3.700 3.130
5781 B 1.722 1.152
BM 1 1956 3.695 3.125
BM 2 1956 3.089 2.519
BM 1 1984 RESET 1.291 0.721
N 260 2.451 1.881
BM 2 1984 RESET 1.064 0.494
5.249 F24 1933 1.726 1.156
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 8 of 8
Station ID: 8725781 PUBLICATION DATE: 11/13/2003
Name: SHELL CREEK, PEACE RIVER
FL
NOAA Chart: 11426 Latitude: 26° 58.8' N ( 26.98000)
USGS Quad: CLEVELAND Longitude: 81° 57.6' W ( -81.96000)
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.