U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 9443826 PUBLICATION DATE: 07/12/2004
Name: CRESCENT BAY
WA
NOAA Chart: 18465 Latitude: 48° 9.7' N ( 48.16170)
USGS Quad: JOYCE Longitude: 123° 43.5' W (-123.72500)
To reach the tidal bench marks from the town of Port Angeles, proceed west on
State Highwy 112 for approximately 26 km (16 mi) to the town of Joyce, turn
right onto Crescent Beach Road at the Joyce General Store, and continue north
for 3.7 km (2.3 mi) to a fork in the road; turn left to the Crescent-Agate Beach
Park (privately owned and operated). The bench marks are located on the western
shore of Crescent Bay. The tide gage and staff were located in the center of
Crescent Bay on the lone set of dolphins.
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 6
Station ID: 9443826 PUBLICATION DATE: 07/12/2004
Name: CRESCENT BAY
WA
NOAA Chart: 18465 Latitude: 48° 9.7' N ( 48.16170)
USGS Quad: JOYCE Longitude: 123° 43.5' W (-123.72500)
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: CRESCENT NO 5 1964
DESIGNATION: TIDAL 5
MONUMENTATION: Bench Mark disk VM#: 9019
AGENCY: US Coast & Geodetic Survey
(USC&GS) IDB PID#: TR0911
SETTING CLASSIFICATION: Bedrock OPUS PID:
LATITUDE: 47° 9.7' N ( 47.16170) LONGITUDE: 123° 43.7' W (-123.72800)
The primary bench mark is a disk set in bedrock in a sloping ledge located at
the base of a 6.10 m (20.0 ft) high rocky bluff on the west side of Crescent
Bay, 128 m (420 ft) NW of the boat launching facilities, 103.69 m (340.2 ft) NNW
of the NW cornere of the building housing a fishing tackle store, 14 m (46 ft)
NNW of bench mark 3 1926, 8 m (25 ft) west of the west edge of the beach, and 2
m (5 ft) above the beach.
BENCH MARK STAMPING: TIDAL BM 7 1975
DESIGNATION: 944 3826 TIDAL 7
MONUMENTATION: Tidal Station disk VM#: 9020
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Rock outcrop OPUS PID:
LATITUDE: 48° 9.7' N ( 48.16170) LONGITUDE: 123° 43.5' W (-123.72500)
The bench mark is a disk set on a rock outcrop located at the south end of a
small beach on the west side of Crescent Bay, 46 m (150 ft) SSW of bench mark NO
STAMPING 1.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 9443826 PUBLICATION DATE: 07/12/2004
Name: CRESCENT BAY
WA
NOAA Chart: 18465 Latitude: 48° 9.7' N ( 48.16170)
USGS Quad: JOYCE Longitude: 123° 43.5' W (-123.72500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: TIDAL BM 8 1975
DESIGNATION: 944 3826 TIDAL 8
MONUMENTATION: Tidal Station disk VM#: 9021
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Rock outcrop OPUS PID:
LATITUDE: 48° 9.7' N ( 48.16170) LONGITUDE: 123° 43.5' W (-123.72500)
The bench mark is a disk set on a rock outcrop located at the north end of a
small beach on the west side of Crescent Bay, 91 m (297 ft) NNW of bench mark
TIDAL BM 7 1975.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 9443826 PUBLICATION DATE: 07/12/2004
Name: CRESCENT BAY
WA
NOAA Chart: 18465 Latitude: 48° 9.7' N ( 48.16170)
USGS Quad: JOYCE Longitude: 123° 43.5' W (-123.72500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING:
DESIGNATION: 944 3826 CRESCENT 1
ALIAS: NO STAMPING 1
MONUMENTATION: Metal Rod VM#: 9022
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Bedrock OPUS PID:
LATITUDE: 48° 9.7' N ( 48.16170) LONGITUDE: 123° 43.5' W (-123.72500)
The bench mark is the highest point of a 0.75-inch diameter solid metal rod set
on a bedrock sloping ledge located on the west side of Crescent Bay,183 m (600
ft) NW of boat launching facilities, 49 m (160 ft) NNW of bench mark CRESCENT NO
5 1964, 4 m (12 ft) SW of the outer edge of the ledge, and 0.01 m (0.04 ft)
above the ledge.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 9443826 PUBLICATION DATE: 07/12/2004
Name: CRESCENT BAY
WA
NOAA Chart: 18465 Latitude: 48° 9.7' N ( 48.16170)
USGS Quad: JOYCE Longitude: 123° 43.5' W (-123.72500)
T I D A L D A T U M S
Tidal datums at CRESCENT BAY based on:
LENGTH OF SERIES: 1 MONTH
TIME PERIOD: October 1978 - October 1978
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 9444900 PORT TOWNSEND, ADMIRALTY INLET
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 2.151
MEAN HIGH WATER MHW = 1.971
MEAN TIDE LEVEL MTL = 1.315
MEAN SEA LEVEL MSL = 1.285
MEAN LOW WATER MLW = 0.659
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
CRESCENT NO 5 1964 2.508 0.537
TIDAL BM 7 1975 2.872 0.901
TIDAL BM 8 1975 3.292 1.321
944 3826 CRESCENT 1 2.587 0.616
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 9443826 PUBLICATION DATE: 07/12/2004
Name: CRESCENT BAY
WA
NOAA Chart: 18465 Latitude: 48° 9.7' N ( 48.16170)
USGS Quad: JOYCE Longitude: 123° 43.5' W (-123.72500)
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.