U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 9414575 PUBLICATION DATE: 04/17/2018
Name: COYOTE CREEK, ALVISO SLOUGH
CA
NOAA Chart: 18651 Latitude: 37° 27.9' N ( 37.46500)
USGS Quad: MOUNTAIN VIEW Longitude: 122° 1.4' W (-122.02300)
To reach the tidal bench marks from the intersection of U. S. Highway 101 and
State Route 237, proceed 4.7 km (2.9 mi) east on SR 237, exit at Great America
Pkwy and proceed 0.5 km (0.3 mi), then turn left onto Great America Parkway and
proceed 0.2 km (0.1 mi), then turn rigt onto Gold St. Connector and proceed 0.4
km (0.2 mi), then turn left onto Gold St. for 1.2 km (0.8 mi), then continue on
Elizabeth St. for 0.3 km (0.2 mi), then turn right onto Hope St. and enter the
Alviso Marina County Park. From the Alviso Marina County Park, proceed by boat
NW down Alviso Slough 5.6 km (3.5 mi) to Coyote Creek. The bench marks are in
the concrete bases of a line of tall power transmission towers across the
slough.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: TIDAL BM 1 1975
DESIGNATION: 941 4575 1 TIDAL
MONUMENTATION: Tidal Station disk VM#: 8354
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 37° 27.8' N ( 37.46389) LONGITUDE: 122° 1.4' W (-122.02403)
The primary bench mark is a disk set flush in the east corner of the concrete
foundation of the Pacific Gas and Electric Company's power transmission tower
"NEWARK-MAGNESIUM 3/25 CIR 2", 8.00 m (26.2 ft) SE of the northern-most concrete
leg of the electrical tower, 5.70 (18.7 ft) west of the center of the electrical
tower base, and 1.00 m (3.3 ft) west of the east steel leg of the tower on the
centerline of the east-west diagonal concrete brace.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 9414575 PUBLICATION DATE: 04/17/2018
Name: COYOTE CREEK, ALVISO SLOUGH
CA
NOAA Chart: 18651 Latitude: 37° 27.9' N ( 37.46500)
USGS Quad: MOUNTAIN VIEW Longitude: 122° 1.4' W (-122.02300)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: F 555 1956
DESIGNATION: F 555
MONUMENTATION: Bench Mark disk VM#: 8359
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: HT1411
SETTING CLASSIFICATION: Concrete base OPUS PID:
LATITUDE: 37° 27.6' N ( 37.46000) LONGITUDE: 122° 1.6' W (-122.02700)
The bench mark is a disk set in the top of the north corner of the concrete base
of the north leg of steel power line transmission tower 3/24, 27.52 m (90.3 ft)
SE of the SE edge of the boardwalk, 3.81 m (12.5 ft) NE of the NE edge of a
boardwalk leading SE to the tower, and 0.70 m (2.3 ft) above the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 9414575 PUBLICATION DATE: 04/17/2018
Name: COYOTE CREEK, ALVISO SLOUGH
CA
NOAA Chart: 18651 Latitude: 37° 27.9' N ( 37.46500)
USGS Quad: MOUNTAIN VIEW Longitude: 122° 1.4' W (-122.02300)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: H 555 1956
DESIGNATION: H 555
MONUMENTATION: Bench Mark disk VM#: 8360
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: HT1409
SETTING CLASSIFICATION: Concrete base OPUS PID:
LATITUDE: 37° 27.5' N ( 37.45830) LONGITUDE: 122° 1.7' W (-122.02800)
The bench mark is a disk set in the top of the east corner of the concrete base
for the east steel leg of steel power line transmission tower 3/26, 16 m (52 ft)
SE of the SE edge of the boardwalk, and 0.58 m (1.9 ft) above the ground.
BENCH MARK STAMPING: 4575 A 2011
DESIGNATION: 941 4575 A
MONUMENTATION: Tidal Station disk VM#: 20202
AGENCY: US Army Corps of Engineers (USACE) IDB PID#:
SETTING CLASSIFICATION: Concrete base OPUS PID:
LATITUDE: 37° 27.8' N ( 37.46381) LONGITUDE: 122° 1.5' W (-122.02456)
The bench mark is a disk set flush in the west corner of the concrete foundation
of the Pacific Gas and Electric Company's power transmission tower
"NEWARK-MAGNESIUM 3/24", 11.30 m (37.1 ft) NW of the center of the southern-most
concrete tower leg, 11.30 (37.1 ft) SW of the center of the northern-most
concrete tower leg, and 0.6 m (2.0 ft) east of the western steel leg of the
tower.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 9414575 PUBLICATION DATE: 04/17/2018
Name: COYOTE CREEK, ALVISO SLOUGH
CA
NOAA Chart: 18651 Latitude: 37° 27.9' N ( 37.46500)
USGS Quad: MOUNTAIN VIEW Longitude: 122° 1.4' W (-122.02300)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 4575 B 2011
DESIGNATION: 941 4575 B
MONUMENTATION: Tidal Station disk VM#: 20203
AGENCY: US Army Corps of Engineers (USACE) IDB PID#:
SETTING CLASSIFICATION: Concrete base OPUS PID:
LATITUDE: 37° 27.8' N ( 37.46375) LONGITUDE: 122° 1.5' W (-122.02444)
The bench mark is a disk set flush in the south corner of the concrete
foundation of the Pacific Gas and Electric Company's power transmission tower
"NEWARK-MAGNESIUM 3/24", 11.40 m (37.4 ft) SE of center of the western-most
concrete tower leg, 10.10 m (33.1 ft) SW of center of the eastern-most concrete
tower leg, and 0.60 m (2.0 ft) NE of the southern steel leg of the tower.
BENCH MARK STAMPING: 4575 C 2011
DESIGNATION: 941 4575 C
MONUMENTATION: Tidal Station disk VM#: 20204
AGENCY: US Army Corps of Engineers (USACE) IDB PID#:
SETTING CLASSIFICATION: Concrete base OPUS PID:
LATITUDE: 37° 27.8' N ( 37.46383) LONGITUDE: 122° 1.5' W (-122.02439)
The bench mark is a disk set flush in the east corner of the concrete foundation
of the Pacific Gas and Electric Company's power transmission tower
"NEWARK-MAGNESIUM 3/24", 11.30 m (37.1 ft) SE of center of the northern-most
concrete tower leg, 10.70 m (35.1 ft) SW of center of the southern-most concrete
tower leg, and 0.60 m (2.0 ft) east of the eastern steel leg of the tower.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 9414575 PUBLICATION DATE: 04/17/2018
Name: COYOTE CREEK, ALVISO SLOUGH
CA
NOAA Chart: 18651 Latitude: 37° 27.9' N ( 37.46500)
USGS Quad: MOUNTAIN VIEW Longitude: 122° 1.4' W (-122.02300)
T I D A L D A T U M S
Tidal datums at COYOTE CREEK, ALVISO SLOUGH based on:
LENGTH OF SERIES: 4 YEARS
TIME PERIOD: 4/11-3/12, 7/14-6/16, & 11/16 - 10/17
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 9414523 REDWOOD CITY, WHARF 5, S. F. BAY
Elevations of tidal datums referred to Mean High Water (MHW), in METERS:
HIGHEST OBSERVED WATER LEVEL (12/03/1983) = 1.223
MEAN HIGHER HIGH WATER MHHW = 0.181
MEAN HIGH WATER MHW = 0.000
MEAN SEA LEVEL MSL = -1.033
MEAN TIDE LEVEL MTL = -1.078
MEAN LOW WATER MLW = -2.157
MEAN LOWER LOW WATER MLLW = -2.516
LOWEST OBSERVED WATER LEVEL (02/17/1984) = -3.106
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
TIDAL BM 1 1975 5.486 2.970
F 555 1956 3.377 0.861
H 555 1956 2.471 -0.045
4575 A 2011 6.117 3.601
4575 B 2011 6.122 3.606
4575 C 2011 6.118 3.602
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 9414575 PUBLICATION DATE: 04/17/2018
Name: COYOTE CREEK, ALVISO SLOUGH
CA
NOAA Chart: 18651 Latitude: 37° 27.9' N ( 37.46500)
USGS Quad: MOUNTAIN VIEW Longitude: 122° 1.4' W (-122.02300)
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.