U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
PUBLICATION DATE: 11/24/1997
Station ID: 9442861 SUPERCEDED DATE: 04/21/2003
Name: MUKKAW BAY
WASHINGTON
NOAA Chart: 18485 Latitude: 48° 17.8' N
USGS Quad: MAKA BAY Longitude: 124° 40.3' W
To reach the tidal bench marks from Post Office at Neah Bay proceed 0.9 km (0.6
mi) SW along Bayview Avenue, continue 4.3 km (2.7 mi) south along State Highway
1, go 2.7 km (1.7 mi) SW along a private logging road, 2.6 km (1.6 mi) SW along
a gravel road leading to the Makah Indian Community, 1.1 km (0.7 mi) SW along
beach to large outcrop (projecting 12 m (40 ft) above level of beach), then
westerely along coastline to a cove and outcroppings along beach. The bench
marks are located to the west and east of Anderson Point along the beach.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 2861 H 1978
MONUMENTATION: Tidal Station Disk VM#: 9010
AGENCY: PID:
SETTING CLASSIFICATION: Bedrock
The primary bench mark is a disk set in bedrock atop southeastern corner of an
islet 9m (30 ft) above the shorline, 4m (15 ft) east of the eastern edge of the
concrete slab, and 4 m (14 ft) east of threaded rod (protruding vertically from
bedrock in the center of an islet). The bench mark can be reached at low water
by walking across seaweed covered rocks.
BENCH MARK STAMPING: 2861 A 1977
MONUMENTATION: Tidal Station Disk VM#: 9003
AGENCY: PID#: TS0189
SETTING CLASSIFICATION: Bedrock
The bench mark is a disk set in bedrock on Anderson Point, 52 m (170 ft) NW of
Bench Mark 2861 B 1977, 11 m (35 ft) east of the northernmost of a group of
three 1 m (3 ft) high aluminum poles, 5.03 m (16.5 ft) east of rusted walkway
support, and 1 m (4 ft) above and west of the shoreline. The rock has been
painted near the mark. (Note the mark must be recovered during low tide or rock
climbing gear is needed.)
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
PUBLICATION DATE: 11/24/1997
Station ID: 9442861 SUPERCEDED DATE: 04/21/2003
Name: MUKKAW BAY
WASHINGTON
NOAA Chart: 18485 Latitude: 48° 17.8' N
USGS Quad: MAKA BAY Longitude: 124° 40.3' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 2861 B 1977
MONUMENTATION: Tidal Station Disk VM#: 9004
AGENCY: PID#: TS0188
SETTING CLASSIFICATION: Bedrock
The bench mark is a disk set in bedrock on Anderson Point, on west side of the
easternmost rock outcropping on the Point, 6 m (21 ft) west and above the
shoreline, and 3 m (9 ft) east of the face of a cliff. The rock has been
painted near the mark. (Note the mark must be recovered during low tide.)
BENCH MARK STAMPING: 2861 C 1977
MONUMENTATION: Tidal Station Disk VM#: 9005
AGENCY: PID#: TS0187
SETTING CLASSIFICATION: Bedrock
The bench mark is a disk set in bedrock on east side of the easternmost rock
outcropping on Anderson Point, directly east of Bench Mark 2861 B 1977, 30 m
(100 ft) south of the rock outcropping, and 11 m (35 ft) west of high water
line. The rock has been painted near the mark.
BENCH MARK STAMPING: 2861 D 1977
MONUMENTATION: Tidal Station Disk VM#: 9006
AGENCY: PID#: TS0186
SETTING CLASSIFICATION: Bedrock
The bench mark is a disk cemented into rock on the SE side of Anderson Point and
directly south of Bench Mark 2861 C 1977. The rock has been painted near the
mark.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
PUBLICATION DATE: 11/24/1997
Station ID: 9442861 SUPERCEDED DATE: 04/21/2003
Name: MUKKAW BAY
WASHINGTON
NOAA Chart: 18485 Latitude: 48° 17.8' N
USGS Quad: MAKA BAY Longitude: 124° 40.3' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 2861 E 1977
MONUMENTATION: Tidal Station Disk VM#: 9007
AGENCY: PID#: TS0185
SETTING CLASSIFICATION: Bedrock
The bench mark is a disk cemented in rock along the beach east of and across
Mukkaw Bay from Anderson Point, SW of Bench Mark 2861 F 1978, and on SW side of
southernmost one of two outcroppings.
BENCH MARK STAMPING: 2861 F 1978
MONUMENTATION: Tidal Station Disk VM#: 9008
AGENCY: PID:
SETTING CLASSIFICATION: Bedrock
The bench mark is a disk set in bedrock on the western side of the easternmost
of two outcroppings east of Anderson Point, 87 m (286 ft) south of Bench Mark
2861 G 1978, 28 m (91 ft) (north of tall grassline lined by washed up logs, 3 m
(9 ft) below grass cover on rock outcrop, and 1 m (3 ft) above sand level.
BENCH MARK STAMPING: 2861 G 1978
MONUMENTATION: Tidal Station Disk VM#: 9009
AGENCY: PID:
SETTING CLASSIFICATION: Bedrock
The bench mark is a disk set in bedrock on the tip of the easternmost of two
outcroppings east of Anderson Point, 5 m (16 ft) south of the high water line
point, and 4 m (12 ft) above the high water line. The bench mark can be reached
from below by climbing up a prominent gullery in the rock outcrop 6 m (20 ft)
above shoreline and looking down and to the left.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
PUBLICATION DATE: 11/24/1997
Station ID: 9442861 SUPERCEDED DATE: 04/21/2003
Name: MUKKAW BAY
WASHINGTON
NOAA Chart: 18485 Latitude: 48° 17.8' N
USGS Quad: MAKA BAY Longitude: 124° 40.3' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: L 445 1977
MONUMENTATION: Survey Disk VM#: 9011
AGENCY: PID#: TS0184
SETTING CLASSIFICATION: Rock Outcrop
The bench mark is a disk at the base of the NE side of a rock outcrop on the
beach, east of Bench Mark 2861 G 1978, 0.3 m (1 ft) south of a witness post, and
1 m (3 ft) above the beach.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
PUBLICATION DATE: 11/24/1997
Station ID: 9442861 SUPERCEDED DATE: 04/21/2003
Name: MUKKAW BAY
WASHINGTON
NOAA Chart: 18485 Latitude: 48° 17.8' N
USGS Quad: MAKA BAY Longitude: 124° 40.3' W
T I D A L D A T U M S
Tidal datums at MUKKAW BAY based on:
LENGTH OF SERIES: 12 MONTHS
TIME PERIOD: November 1978 - October 1979
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 9443090 NEAH BAY, STRAIT OF JUAN DE FUCA
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (10/22/1979) = 3.473
MEAN HIGHER HIGH WATER (MHHW) = 2.669
MEAN HIGH WATER (MHW) = 2.448
MEAN SEA LEVEL (MSL) = 1.455
MEAN TIDE LEVEL (MTL) = 1.448
MEAN LOW WATER (MLW) = 0.449
* NORTH AMERICAN VERTICAL DATUM-1988 (NAVD) = 0.343
MEAN LOWER LOW WATER (MLLW) = 0.000
LOWEST OBSERVED WATER LEVEL (12/30/1978) = -1.041
* Use with caution since NAVD is based on only one benchmark.
National Geodetic Vertical Datum (NGVD 29)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
2861 H 1978 10.011 7.563
2861 A 1977 5.581 3.133
2861 B 1977 7.518 5.070
2861 C 1977 5.292 2.844
2861 D 1977 7.074 4.626
2861 E 1977 6.497 4.049
2861 F 1978 4.998 2.550
2861 G 1978 6.318 3.870
L 445 1977 2.753 0.305
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
PUBLICATION DATE: 11/24/1997
Station ID: 9442861 SUPERCEDED DATE: 04/21/2003
Name: MUKKAW BAY
WASHINGTON
NOAA Chart: 18485 Latitude: 48° 17.8' N
USGS Quad: MAKA BAY Longitude: 124° 40.3' W
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 (NAVD 88).
NGVD 29 is a fixed datum adopted as a national standard geodetic reference for
heights but is now considered superseded. NGVD 29 is sometimes referred to as
Sea Level Datum of 1929 or as Mean Sea Level on some early issues of Geological
Survey Topographic Quads. NGVD 29 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 NGVD 29 are available from the National
Geodetic Survey (NGS) data base via the World Wide Web at
National Geodetic Survey.
NAVD 88 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. NAVD 88 replaces NGVD 29 as the national
standard geodetic reference for heights. Bench mark elevations relative to
NAVD 88 are available from NGS through the World Wide Web at
National Geodetic Survey.
NGVD 29 and NAVD 88 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 NAVD 88 elevation is shown on the Elevations of Tidal Datums Table Referred
to MLLW only when two or more of the bench marks listed have NAVD 88 elevations.
The NAVD 88 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, NAVD 88 bench mark elevations computed indirectly from the tidal
datums elevation table may differ slightly from NAVD 88 elevations listed for
each bench mark in the NGS database.