NOAA Web Site Link Tides and Currents Home Page Transparent placeholder image

Bench Mark Sheet for 9415584, Petaluma River, Upper Drawbridge CA

Superseded Epoch

Large map location marker Station Location
Small red map location marker Published bench mark
Small blue map location marker Unpublished bench mark

Bench mark positions only appear on the map if their coordinates in the CO-OPS database are at the precision of degrees/minutes/seconds/and tenths of seconds. If the coordinates are less precise, the mark will not appear.

Printable version

                          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.

Return to Top
Products available at 9415584 Petaluma River, Upper Drawbridge, CA

Revised: 10/15/2013
NOAA / National Ocean Service
Web site owner: Center for Operational Oceanographic Products and Services