U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 9
Station ID: 9419750 PUBLICATION DATE: 04/21/2003
Name: CRESCENT CITY, PACIFIC OCEAN
CA
NOAA Chart: 18603 Latitude: 41° 44.7' N ( 41.74500)
USGS Quad: SISTER ROCKS Longitude: 124° 11.0' W (-124.18300)
To reach the tidal bench marks from U.S. 101 turn west on Citizen's Dock Road
and continue until you reach Citizen's Dock pier. The tidal bench marks are
located along the Citizen's Dock Road, and the tida gauge is located on north
side of pier, just west of fuel oil house, and south end of town.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: TIDAL 20 1959 RESET 1960
DESIGNATION: 941 9750 TIDAL 20 RESET
MONUMENTATION: Tidal Station disk VM#: 1016
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: LV0110
SETTING CLASSIFICATION: Concrete block OPUS PID#: LV0110
LATITUDE: 41° 44.8' N ( 41.74594) LONGITUDE: 124° 11.0' W (-124.18386)
The primary bench mark is a disk set in top of an 0.46 m (1.5 ft) square
concrete block at the west corner of retaining wall where cement portion of
Citizens Dock joins asphalt portion of parking lot, west of the ramp to a small
floating pier, 9.70 m (31.8 ft) west of a small crane located on the seawall,
4.90 m (16.1 ft) east of the center of the roadway on dock, 2.20 m (7.2 ft)
north of the north end of the eastern bull rail of Citizens Dock, and 0.20 m
(0.7 ft) above the dock pavement.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 9
Station ID: 9419750 PUBLICATION DATE: 04/21/2003
Name: CRESCENT CITY, PACIFIC OCEAN
CA
NOAA Chart: 18603 Latitude: 41° 44.7' N ( 41.74500)
USGS Quad: SISTER ROCKS Longitude: 124° 11.0' W (-124.18300)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: S 1089 RESET 1974
DESIGNATION: S 1089 RESET
MONUMENTATION: Vertical Control disk VM#: 1025
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: LV0101
SETTING CLASSIFICATION: Sidewalk OPUS PID:
LATITUDE: 41° 44.9' N ( 41.74867) LONGITUDE: 124° 10.9' W (-124.18197)
The bench mark is disk set flush in the sidewalk adjacent to a 30.50 m (100.1
ft) high light pole at the east corner of the Darold G. Richcreek Inner boat
basin, 17.10 m (56.1 ft) SE from a yellow fire hydrant, 0.80 m (2.6 ft) east of
the east corner of a 0.60 m x 0.60 m (2.0 ft x 2.0 ft) metal electric access
cover in sidewalk, and 0.40 m (1.3 ft) south of the light pole.
BENCH MARK STAMPING: NO 23 1972
DESIGNATION: 941 9750 TIDAL 23
MONUMENTATION: Tidal Station disk VM#: 1027
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: LV0561
SETTING CLASSIFICATION: Concrete slab OPUS PID:
LATITUDE: 41° 45.1' N ( 41.75142) LONGITUDE: 124° 11.0' W (-124.18411)
The bench mark is a disk set in the northern corner of the concrete slab in
front of the office of the Town House Motel along U.S. Highway 101, 15.20 m
(49.9 ft) SW of the centerline of U.S. Highway 101, 8.20 m (26.9 ft) west of a
street light pole, 0.20 m (0.7 ft) above the street level, and 0.20 m (0.7 ft)
south from the corner of the concrete slab.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 9
Station ID: 9419750 PUBLICATION DATE: 04/21/2003
Name: CRESCENT CITY, PACIFIC OCEAN
CA
NOAA Chart: 18603 Latitude: 41° 44.7' N ( 41.74500)
USGS Quad: SISTER ROCKS Longitude: 124° 11.0' W (-124.18300)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 24 1972
DESIGNATION: 941 9750 TIDAL 24
MONUMENTATION: Tidal Station disk VM#: 1028
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Pavement OPUS PID:
LATITUDE: 41° 45.0' N ( 41.74931) LONGITUDE: 124° 10.8' W (-124.18047)
The bench mark is a disk set on the west side of the main entrance to Stephen's
Bayside Realty at 695 Highway 101, near the intersection of Highway 101 and the
road leading to Citizen's Dock, 29.70 m (97.4 ft) NW of the intersection, 5.60 m
(18.4 ft) east of the SW corner of the building, 0.20 m (0.7 ft) west of the
northern-most corner of the ramp leading into Bayside Realty, and 0.07 m (0.2
ft) below the asphalt surface.
BENCH MARK STAMPING: NO 25 1972
DESIGNATION: 941 9750 TIDAL 25
MONUMENTATION: Tidal Station disk VM#: 1029
AGENCY: National Ocean Survey (NOS) IDB PID#: LV0565
SETTING CLASSIFICATION: Concrete slab OPUS PID:
LATITUDE: 41° 44.8' N ( 41.74714) LONGITUDE: 124° 11.0' W (-124.18275)
The bench mark is a disk set in the SW corner of a 1.22 m x 1.22 m (4.0 ft x 4.0
ft) concrete slab, 39.10 m (128.3 ft) west of Del Norte Art Association Gallery
stairwell along Citizens Dock Road, 33.50 m (109.9 ft) NE of the intersection of
Marine Way and Citizens Dock Road, 7.60 m (24.9 ft) SE from the centerline of
Citizens Dock Road, 0.30 m (1 ft) SE of the SE curb of Citizens Dock Road, and
0.20 m (0.7 ft) NE of a 4-inch diameter 1 m (3 ft) tall metal pipe.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 9
Station ID: 9419750 PUBLICATION DATE: 04/21/2003
Name: CRESCENT CITY, PACIFIC OCEAN
CA
NOAA Chart: 18603 Latitude: 41° 44.7' N ( 41.74500)
USGS Quad: SISTER ROCKS Longitude: 124° 11.0' W (-124.18300)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 9750 S 1977
DESIGNATION: 941 9750 S TIDAL
MONUMENTATION: Tidal Station disk VM#: 1030
AGENCY: National Ocean Survey (NOS) IDB PID#: LV0562
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 41° 45.0' N ( 41.75047) LONGITUDE: 124° 10.9' W (-124.18228)
The bench mark is a disk located 219 m (718 ft) NW of the intersection of
Citizen's Dock Road and Highway 101, 7.60 m (24.9 ft) north of the SE edge of
Highway 101 in a landscaped section of the Northwoods Inn Motel entrance, and
0.20 m (0.7 ft) east of a metal witness post. The bench mark is set 0.12 m (0.4
ft) below the ground, crimped to a 5/8-inch copper-clad steel rod driven to a
depth of 9.7 m (32 ft), and encased in a 4" PVC pipe with a cap.
BENCH MARK STAMPING: 9750 V 1985
DESIGNATION: 941 9750 V TIDAL
MONUMENTATION: Tidal Station disk VM#: 1032
AGENCY: National Ocean Service (NOS) IDB PID#: LV0563
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID#: LV0563
LATITUDE: 41° 44.9' N ( 41.74881) LONGITUDE: 124° 10.9' W (-124.18089)
The bench mark is a disk located in a vertical mark access cover attached to
concrete boot that surrounds the mark, 40.40 m (132.5 ft) NW of the west corner
of Fresh Seafood Restaurant, 23.20 m (76.1 ft) NE of the yellow fire hydrant,
13.20 m (43.3 ft) NW of the centerline of Citizens Dock Road, 2.10 m (6.9 ft)
north of the southern-most utility box marked with the letters AD, and 0.30 m (1
ft) west of an orange NOAA witness post. The bench mark is crimped to the top
of a 5/8-inch copper-clad steel rod driven to absolute refusal at 9.7 m (32 ft).
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 9
Station ID: 9419750 PUBLICATION DATE: 04/21/2003
Name: CRESCENT CITY, PACIFIC OCEAN
CA
NOAA Chart: 18603 Latitude: 41° 44.7' N ( 41.74500)
USGS Quad: SISTER ROCKS Longitude: 124° 11.0' W (-124.18300)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 9750 W 1988
DESIGNATION: 941 9750 W
MONUMENTATION: Tidal Station disk VM#: 1033
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete sidewalk OPUS PID:
LATITUDE: 41° 44.9' N ( 41.74778) LONGITUDE: 124° 10.9' W (-124.18178)
The bench mark is a disk set in a concrete sidewalk on the south side of the
Englund Marine Supply, 15.20 m (49.9 ft) east of the centerline of Citizens Dock
Road, 1.20 m (3.9 ft) south of the building and 0.30 m (1 ft) west of the east
edge of the concrete sidewalk.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 9
Station ID: 9419750 PUBLICATION DATE: 04/21/2003
Name: CRESCENT CITY, PACIFIC OCEAN
CA
NOAA Chart: 18603 Latitude: 41° 44.7' N ( 41.74500)
USGS Quad: SISTER ROCKS Longitude: 124° 11.0' W (-124.18300)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: U 1089 RESET 1984
DESIGNATION: U 1089 RESET
MONUMENTATION: Tidal Station disk VM#: 1034
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: LV0566
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 41° 44.8' N ( 41.74631) LONGITUDE: 124° 10.9' W (-124.18200)
The bench mark is a disk set in the west side of a concrete foundation
surrounding five railroad tracks used for drydocking boats, 50.50 m (165.7 ft)
south of the large building for the Marine and Construction Repair, 9.30 m (30.5
ft) east of the chain link fence on the west side of the work yard, and 5.90 m
(19.4 ft) south of the NW corner of the foundation.
BENCH MARK STAMPING: AQUA REF MARK 1989
DESIGNATION: 941 9750 AQUAREF MARK
MONUMENTATION: Tidal Station disk VM#: 12550
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete bull rail OPUS PID:
LATITUDE: 41° 44.7' N ( 41.74556) LONGITUDE: 124° 11.1' W (-124.18433)
The bench mark is a disk set in top of the cement bull rail on the NW side of
the pier, 6.10 m (20.0 ft) SW of the tide house on the same side of the pier,
0.20 m (0.7 ft) SE of the NW edge of bullrail, and 0.20 m (0.7 ft) above wharf
deck.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 9
Station ID: 9419750 PUBLICATION DATE: 04/21/2003
Name: CRESCENT CITY, PACIFIC OCEAN
CA
NOAA Chart: 18603 Latitude: 41° 44.7' N ( 41.74500)
USGS Quad: SISTER ROCKS Longitude: 124° 11.0' W (-124.18300)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 9750 X 1995
DESIGNATION: 941 9750 X TIDAL
MONUMENTATION: Tidal Station disk VM#: 12691
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete footing OPUS PID:
LATITUDE: 41° 44.7' N ( 41.74500) LONGITUDE: 124° 11.0' W (-124.18300)
The bench mark is a disk set flush in a concrete footing supporting a 0.20 m
(0.7 ft) diameter cut off steel post along the south side of Marine Way, in the
NE corner of the parking lot surrounding the Crescent City Harbor Master's
Office, 27.20 m (89.2 ft) SSW of the SW corner of the Seafarer's Hall,
Commercial Fisherman's Wives Association building, 1.90 m (6.2 ft) NW from the
NW corner of a chain link fence surrounding a boat repair yard, 1.40 m (4.6 ft)
SW of the south curb of Marine Way, and 0.20 m (0.7 ft) west of the above
mentioned steel post.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 8 of 9
Station ID: 9419750 PUBLICATION DATE: 04/21/2003
Name: CRESCENT CITY, PACIFIC OCEAN
CA
NOAA Chart: 18603 Latitude: 41° 44.7' N ( 41.74500)
USGS Quad: SISTER ROCKS Longitude: 124° 11.0' W (-124.18300)
T I D A L D A T U M S
Tidal datums at CRESCENT CITY, PACIFIC 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 (01/29/1983) = 3.250
MEAN HIGHER HIGH WATER MHHW = 2.095
MEAN HIGH WATER MHW = 1.900
MEAN TIDE LEVEL MTL = 1.140
MEAN SEA LEVEL MSL = 1.130
MEAN LOW WATER MLW = 0.380
North American Vertical Datum NAVD88 = 0.116
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (06/13/1991) = -1.043
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
TIDAL 20 1959 RESET 1960 4.103 2.203
S 1089 RESET 1974 4.463 2.563
NO 23 1972 4.888 2.988
NO 24 1972 4.652 2.752
NO 25 1972 3.468 1.568
9750 S 1977 4.441 2.541
9750 V 1985 4.589 2.689
9750 W 1988 3.905 2.005
U 1089 RESET 1984 3.844 1.944
AQUA REF MARK 1989 0.000 0.000
9750 X 1995 3.356 1.456
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 9 of 9
Station ID: 9419750 PUBLICATION DATE: 04/21/2003
Name: CRESCENT CITY, PACIFIC OCEAN
CA
NOAA Chart: 18603 Latitude: 41° 44.7' N ( 41.74500)
USGS Quad: SISTER ROCKS Longitude: 124° 11.0' W (-124.18300)
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.