U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 8
Station ID: 8661070 PUBLICATION DATE: 04/21/2003
Name: SPRINGMAID PIER, ATLANTIC OCEAN
SC
NOAA Chart: 11535 Latitude: 33° 39.3' N ( 33.65500)
USGS Quad: MYRTLE BEACH Longitude: 78° 55.1' W ( -78.91830)
To reach the tidal bench marks from the intersection of 1st Avenue South and
Ocean Boulevard in Myrtle Beach, proceed 4.0 km (2.5 mi) SW on Ocean Boulevard
(State Highway 73) to Springmaid Fishing Pier. The bench marks are near
Springmaid Beach along Springmaid Beach Road, State Highway 73, and U.S. Highway
17. The tide gage and staff were about 198 m (650 ft) offshore on Springmaid
Fishing Pier.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 1070 J 1982
DESIGNATION: 866 1070 J TIDAL
MONUMENTATION: Tidal Station disk VM#: 571
AGENCY: National Ocean Survey (NOS) IDB PID#: DD1542
SETTING CLASSIFICATION: Stainless steel rod OPUS PID#: DD1542
LATITUDE: 33° 39.5' N ( 33.65831) LONGITUDE: 78° 55.2' W ( -78.92000)
The primary bench mark is a disk located along State Highway 73 (Ocean
Boulevard) north of Springmaid Pier, 21.79 m (71.5 ft) north of the NW corner of
an aluminum building, 15 m (49 ft) south of the center of the median of the
highway, 14.11 m (46.3 ft) NNE of utility pole No. 18635 with a meter attached,
10.30 m (33.8 ft) east of the center of the entrance to Lift Station No. 70,
1.58 m (5.2 ft) east of the utility pole No. 68803 with a guy cable and
transformer, 1.19 m (3.9 ft) east of a witness post, and 0.30 m (1.0 ft) below
the level of the highway. The bench mark is 21 cm (0.7 ft) below ground level,
crimped to a copper-coated 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 2 of 8
Station ID: 8661070 PUBLICATION DATE: 04/21/2003
Name: SPRINGMAID PIER, ATLANTIC OCEAN
SC
NOAA Chart: 11535 Latitude: 33° 39.3' N ( 33.65500)
USGS Quad: MYRTLE BEACH Longitude: 78° 55.1' W ( -78.91830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1070 C 1976
DESIGNATION: 866 1070 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 389
AGENCY: National Ocean Service (NOS) IDB PID#: DD0846
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 33° 39.0' N ( 33.65000) LONGITUDE: 78° 55.0' W ( -78.91667)
The bench mark is a disk set in the concrete footing of the south leg of a sign
(Springmaid Beach), along State Higheway 73 near Pebble Beach Campground, 27.19
m (89.2 ft) south of the center of the median of the highway, 17.31 m (56.8 ft)
SE of utility pole No. 40210 with four guy cables, 15.79 m (51.8 ft) NNW of the
centerline of road S-26-28, and 0.40 m (1.3 ft) above the level of the
boulevard.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 8
Station ID: 8661070 PUBLICATION DATE: 04/21/2003
Name: SPRINGMAID PIER, ATLANTIC OCEAN
SC
NOAA Chart: 11535 Latitude: 33° 39.3' N ( 33.65500)
USGS Quad: MYRTLE BEACH Longitude: 78° 55.1' W ( -78.91830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: BOURBON NO 2 1962
DESIGNATION: BOURBON RM 2
MONUMENTATION: Reference Mark disk VM#: 567
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: DD0844
SETTING CLASSIFICATION: Concrete box culvert OPUS PID#: DD0844
LATITUDE: 33° 39.6' N ( 33.66000) LONGITUDE: 78° 55.0' W ( -78.91669)
The bench mark is a disk set in the east corner of a concrete box culvert in the
west corner of a parking area for the Ocean Front Go Karts, 1.0 km (0.6 mi) NE
along State Highway 73 (Ocean Boulevard) from its intersection with U.S. Highway
17 Business.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 8
Station ID: 8661070 PUBLICATION DATE: 04/21/2003
Name: SPRINGMAID PIER, ATLANTIC OCEAN
SC
NOAA Chart: 11535 Latitude: 33° 39.3' N ( 33.65500)
USGS Quad: MYRTLE BEACH Longitude: 78° 55.1' W ( -78.91830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: BOURBON 1962 (AZ)
DESIGNATION: BOURBON AZ MK
ALIAS: AZ
MONUMENTATION: Azimuth Mark disk VM#: 568
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: DD0849
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 33° 39.5' N ( 33.65831) LONGITUDE: 78° 55.7' W ( -78.92831)
The bench mark is a disk set flush in top of a concrete monument near the
intersection of State Highway 73 and U.S. Highway 17 Business, 56.36 m (184.9
ft) WSW of the SW face of a cinder block sign (WELCOME TO MYRTLE BEACH), 48.89
m (160.4 ft) NE of power pole NA9/18968, 7.59 m (24.9 ft) SSE of the center of
the northbound lanes of the highway, 4.66 m (15.3 ft) NNW of the center of a
paved road leading to State Highway 73, and about 0.05 m (0.2 ft) below ground
level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 8
Station ID: 8661070 PUBLICATION DATE: 04/21/2003
Name: SPRINGMAID PIER, ATLANTIC OCEAN
SC
NOAA Chart: 11535 Latitude: 33° 39.3' N ( 33.65500)
USGS Quad: MYRTLE BEACH Longitude: 78° 55.1' W ( -78.91830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1070 H 1978
DESIGNATION: 866 1070 H TIDAL
MONUMENTATION: Tidal Station disk VM#: 570
AGENCY: National Ocean Service (NOS) IDB PID#: DD0850
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 33° 39.5' N ( 33.65830) LONGITUDE: 78° 55.6' W ( -78.92670)
The bench mark is a disk located in a grassy median in the east angle of the
intersection of State Highway 73 (Ocean Boulevard) and U.S. Highway 17 Business,
near the entrance to Myrtle Beach Air Force Base, 30.91 m (101.4 ft) WSW of the
NW leg of a Phillips 66 sign, 17.01 m (55.8 ft) ENE of the center of the State
Highway 73, 7.19 m (23.6 ft) SSE of the center of the northbound lanes of U.S.
Highway 17 Business, and 6.53 m (21.4 ft) west of the center of a paved entrance
road to U.S. Highway 17 Business. The bench mark is set at ground level,
crimped to a copper-clad steel rod driven 9.8 m (32 ft) to refusal, and encased
in a PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 1070 K 1995
DESIGNATION: 866 1070 K
MONUMENTATION: Tidal Station disk VM#: 13769
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 33° 39.5' N ( 33.65831) LONGITUDE: 78° 55.6' W ( -78.92669)
The bench mark is a disk located at the foot of the ramp leading to Springmaid
Pier, 23.99 m (78.7 ft) south of the NE corner of the LSC Hotel, 18.81 m (61.7
ft) north of the SW corner of the Pier Restaurant, and 2.80 m (9.2 ft) SW of the
centerline of the walkway leading to the pier. The bench mark is crimped to a
stainless steel rod driven 5.8 m (19 ft) to refusal, and encased in a 5-inch PVC
pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 8
Station ID: 8661070 PUBLICATION DATE: 04/21/2003
Name: SPRINGMAID PIER, ATLANTIC OCEAN
SC
NOAA Chart: 11535 Latitude: 33° 39.3' N ( 33.65500)
USGS Quad: MYRTLE BEACH Longitude: 78° 55.1' W ( -78.91830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: K 137 1979
DESIGNATION: K 137
MONUMENTATION: Flange-encased Rod VM#: 13770
AGENCY: National Geodetic Survey (NGS) IDB PID#: DD0853
SETTING CLASSIFICATION: Stainless steel rod OPUS PID#: DD0853
LATITUDE: 33° 39.4' N ( 33.65669) LONGITUDE: 78° 55.3' W ( -78.92169)
The bench mark is a flange-encased rod located SSE of the center of the main
entrance to the Springmaid Registration Office, 19.00 m (62.3 ft) ENE of utility
pole No. 40212 with guy wire, 10.79 m (35.4 ft) NW of the centerline of the
road, and 3.81 m (12.5 ft) south of the center of three flag poles. The datum
point is the top of a stainless steel rod driven 7.9 m (26 ft) to refusal, and
encased in a 5-inch NGS logo cap.
BENCH MARK STAMPING: 1070 L 2000
DESIGNATION: 866 1070 L
MONUMENTATION: Flange-encased Rod VM#: 16337
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID:
LATITUDE: 33° 39.9' N ( 33.66500) LONGITUDE: 78° 55.3' W ( -78.92169)
The bench mark a flange-encased rod located on the SW side of the intersection
of S. Ocean Boulevard and Springmaid Boulevard, in the grassy median, 16.52 m
(54.2 ft) north of the centerline of a road leading to the art museum, 8.14 m
(26.7 ft) SE of an aluminum light pole with a double light, 7.28 m (23.9 ft)
west of the centerline of Springmaid Boulevard., and 7.07 m (23.2 ft) east of
the south end of the art museum sign. The datum point is set 10 cm (0.3 ft)
below ground level, being the top of a stainless steel rod driven 17.1 meters
(56 ft) to refusal, and encased in a sleeve to a depth of 0.6 m (2.0 ft) and
inside a five inch logo cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 8
Station ID: 8661070 PUBLICATION DATE: 04/21/2003
Name: SPRINGMAID PIER, ATLANTIC OCEAN
SC
NOAA Chart: 11535 Latitude: 33° 39.3' N ( 33.65500)
USGS Quad: MYRTLE BEACH Longitude: 78° 55.1' W ( -78.91830)
T I D A L D A T U M S
Tidal datums at SPRINGMAID PIER, ATLANTIC OCEAN based on:
LENGTH OF SERIES: 19 Years
TIME PERIOD: January 1983 - December 2001
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION:
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (01/01/1987) = 2.819
MEAN HIGHER HIGH WATER MHHW = 1.707
MEAN HIGH WATER MHW = 1.588
North American Vertical Datum NAVD88 = 0.962
MEAN SEA LEVEL MSL = 0.826
MEAN TIDE LEVEL MTL = 0.823
MEAN LOW WATER MLW = 0.057
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (03/14/1993) = -1.186
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
1070 J 1982 3.020 1.432
1070 C 1976 3.627 2.039
BOURBON NO 2 1962 3.068 1.480
BOURBON 1962 (AZ) 8.258 6.670
1070 H 1978 7.479 5.891
1070 K 1995 2.906 1.318
K 137 1979 5.464 3.876
1070 L 2000 3.384 1.796
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 8 of 8
Station ID: 8661070 PUBLICATION DATE: 04/21/2003
Name: SPRINGMAID PIER, ATLANTIC OCEAN
SC
NOAA Chart: 11535 Latitude: 33° 39.3' N ( 33.65500)
USGS Quad: MYRTLE BEACH Longitude: 78° 55.1' W ( -78.91830)
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.