U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 7
Station ID: 9415584 PUBLICATION DATE: 09/21/2016
Name: PETALUMA RIVER, UPPER DRAWBRIDGE
CA
NOAA Chart: 18654 Latitude: 38° 13.7' N ( 38.22830)
USGS Quad: PETALUMA RIVER Longitude: 122° 36.8' W (-122.61300)
To reach the tidal bench marks from Petaluma, proceed south along U.S. Highway
101 and exit at Lakeville Highway and proceed east to Northwest Pacific Road,
then turn right and proceed south on Northwest Pacific Road. The bench marks
are along the railroad tracks parallel to U.S. Highway 101 and the tide gage and
staff were located on the north side of the Northwestern Pacific Railroad bridge
at Petaluma.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 5584 F 2014
DESIGNATION: 941 5584 F TIDAL
MONUMENTATION: Bench Mark disk VM#: 22021
AGENCY: U.S. Army Corps of Engineers (USACE) IDB PID#:
SETTING CLASSIFICATION: Concrete walkway OPUS PID#: BBDJ93
LATITUDE: 38° 13.9' N ( 38.23117) LONGITUDE: 122° 36.9' W (-122.61481)
The benchmark is located 20.99 m east of the the east corner of the Harbor
Master s Office (781 Baywood Dr.), 14.15 m (46.4 ft) SW of the south corner of
the building at 775 Baywood Dr., and 12.87 m (42.2 ft) SE of a fuel tank. The
bench mark is a disk set in the concrete walkway structure accessing the fueling
dock on the NE side of the boat ramp, approximately 0.9 meter (3 ft) above
ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 7
Station ID: 9415584 PUBLICATION DATE: 09/21/2016
Name: PETALUMA RIVER, UPPER DRAWBRIDGE
CA
NOAA Chart: 18654 Latitude: 38° 13.7' N ( 38.22830)
USGS Quad: PETALUMA RIVER Longitude: 122° 36.8' W (-122.61300)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5584 D 1977
DESIGNATION: 941 5584 D
MONUMENTATION: Tidal Station disk VM#: 8698
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID#: BBDF89
LATITUDE: 38° 13.8' N ( 38.23072) LONGITUDE: 122° 36.9' W (-122.61539)
The bench mark is a brass disk on the westerly edge of a dirt road which
parallels the railroad tracks and is 44.63m north of an abandoned power pole,
and 2.78 m (9.12 ft) east of east rail. The bench mark is set at grade level,
crimped to a copper-clad steel rod driven 14.9 m (49 ft) to refusal, and encased
in a PVC pipe extending 0.15 m (0.5 ft) above the grade.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 7
Station ID: 9415584 PUBLICATION DATE: 09/21/2016
Name: PETALUMA RIVER, UPPER DRAWBRIDGE
CA
NOAA Chart: 18654 Latitude: 38° 13.7' N ( 38.22830)
USGS Quad: PETALUMA RIVER Longitude: 122° 36.8' W (-122.61300)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING:
DESIGNATION: 941 5584 BOLT C
ALIAS: BOLT C
MONUMENTATION: Bolt VM#: 17116
AGENCY: IDB PID#:
SETTING CLASSIFICATION: Foundation for semaphore signal OPUS PID:
LATITUDE: 38° 13.8' N ( 38.23003) LONGITUDE: 122° 36.9' W (-122.61514)
The bench mark is located 126.33 m (414.5 ft) SW of a flag pole at a boat
launch, 5.52 m (18.1 ft) east of a barbed wire fence, 2.78 m (9.1 ft) west of a
westerly rail. The bench mark is a bolt set in the concrete foundation for a
transformer for a semaphore signal, approximately 0.5 m (1.6 ft) above ground.
BENCH MARK STAMPING: 5584 G 2014
DESIGNATION: 941 5584 G TIDAL
MONUMENTATION: Bench Mark disk VM#: 22022
AGENCY: U.S. Army Corps of Engineers (USACE) IDB PID#:
SETTING CLASSIFICATION: Concrete headwall OPUS PID:
LATITUDE: 38° 14.0' N ( 38.23319) LONGITUDE: 122° 37.0' W (-122.61614)
This bench mark is a disk set in a concrete headwall for a drainage ditch on the
north side of Lakeville Highway approximately 73 m (240 ft) SE of an
intersection with a ramp for northbound US101, 26.40 m (86.7 ft) east of street
light pole #K2116, 10.73 m (35.2 ft) SW of 1.83m (6') tall chain link fence at
angle point, and 3.35 m (11 ft) NW of street light pole #K2118.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 7
Station ID: 9415584 PUBLICATION DATE: 09/21/2016
Name: PETALUMA RIVER, UPPER DRAWBRIDGE
CA
NOAA Chart: 18654 Latitude: 38° 13.7' N ( 38.22830)
USGS Quad: PETALUMA RIVER Longitude: 122° 36.8' W (-122.61300)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5584 H 2014
DESIGNATION: 941 5584 H TIDAL
MONUMENTATION: Bench Mark disk VM#: 22023
AGENCY: U.S. Army Corps of Engineers (USACE) IDB PID#:
SETTING CLASSIFICATION: Concrete footing OPUS PID#: BBDK67
LATITUDE: 38° 13.8' N ( 38.23017) LONGITUDE: 122° 36.7' W (-122.61175)
The bench mark is located 40.83 east (134 ft) of the eastern corn of the
Sheraton Hotel building, 35.69 m (117 ft) NE of a light post next to a dumpster
enclosure, 21.68 m (71 ft) of power pole # A2-55T40876345. The bench mark is a
brass disk set in the concrete footing at the SE end of the pedestrian bridge.
BENCH MARK STAMPING: 5584 J 2014
DESIGNATION: 941 5584 J TIDAL
MONUMENTATION: Bench Mark disk VM#: 22024
AGENCY: U.S. Army Corps of Engineers (USACE) IDB PID#:
SETTING CLASSIFICATION: Concrete barrier wall OPUS PID:
LATITUDE: 38° 14.0' N ( 38.23378) LONGITUDE: 122° 37.2' W (-122.61928)
The bench mark is located 84.55 m (277 ft) NW of the SW corner of the NW
abutment of US-101, 31.58 m (103.6 ft) south of the street light pole #03611
(located on the north side of Lakeville Hwy.), and 1.8 m (5.91 ft) east of
street light pole #K2107. The bench mark is a brass disk set in the NW end of a
concrete barrier wall on the SW side of Lakeville Highway approximately 0.73 m
(2.5 ft) above the road pavement.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 7
Station ID: 9415584 PUBLICATION DATE: 09/21/2016
Name: PETALUMA RIVER, UPPER DRAWBRIDGE
CA
NOAA Chart: 18654 Latitude: 38° 13.7' N ( 38.22830)
USGS Quad: PETALUMA RIVER Longitude: 122° 36.8' W (-122.61300)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5584 K 2014
DESIGNATION: 941 5584 K TIDAL
MONUMENTATION: Bench Mark disk VM#: 22025
AGENCY: U.S. Army Corps of Engineers (USACE) IDB PID#:
SETTING CLASSIFICATION: Bridge overpass - concrete footer OPUS PID:
LATITUDE: 38° 14.0' N ( 38.23303) LONGITUDE: 122° 37.1' W (-122.61778)
The bench mark is approximately 128.1 m SE of SE corner of closest Public
Storage Building, 104.2 m NW of freeway abutment face, 17.5 m (57.4 ft) south of
the southerly k-rail of Lakeville Hwy, 9 m (29.5 ft) NE of the northeasterly
rail of an existing railroad, and 4.64 m (15.2 ft) east of a freeway column.
This bench mark is a USACE brass disk set on top of a concrete column footing
structure approximately 2.2 meters (7 ft) above ground for the freeway overpass.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 7
Station ID: 9415584 PUBLICATION DATE: 09/21/2016
Name: PETALUMA RIVER, UPPER DRAWBRIDGE
CA
NOAA Chart: 18654 Latitude: 38° 13.7' N ( 38.22830)
USGS Quad: PETALUMA RIVER Longitude: 122° 36.8' W (-122.61300)
T I D A L D A T U M S
Tidal datums at PETALUMA RIVER, UPPER DRAWBRIDGE based on:
LENGTH OF SERIES: 4 MONTHS
TIME PERIOD: July 2014 - October 2014
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 9414290 SAN FRANCISCO, SAN FRANCISCO BAY
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 2.028
MEAN HIGH WATER MHW = 1.887
MEAN SEA LEVEL MSL = 1.137
MEAN TIDE LEVEL MTL = 1.093
MEAN LOW WATER MLW = 0.299
North American Vertical Datum NAVD88 = 0.095
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
5584 F 2014 2.882 0.995
5584 D 1977 3.244 1.357
941 5584 BOLT C 4.189 2.302
5584 G 2014 3.342 1.455
5584 H 2014 2.840 0.953
5584 J 2014 5.712 3.825
5584 K 2014 5.698 3.811
Foot Notes:
Bench mark 5584 D 1977 is based on one differential leveling connection and does
not meet the quality control standards of the NOS. Therefore, caution should be
used when deriving elevations for this mark.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 7
Station ID: 9415584 PUBLICATION DATE: 09/21/2016
Name: PETALUMA RIVER, UPPER DRAWBRIDGE
CA
NOAA Chart: 18654 Latitude: 38° 13.7' N ( 38.22830)
USGS Quad: PETALUMA RIVER Longitude: 122° 36.8' W (-122.61300)
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.