U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 9415229 PUBLICATION DATE: 09/28/2016
Name: KORTHS HBR, SAN JOAQUIN RIVER
CA
NOAA Chart: 18661 Latitude: 38° 5.9' N ( 38.09761)
USGS Quad: BOULDIN ISLAND Longitude: 121° 34.1' W (-121.56838)
To reach the tidal bench marks from Rio Vista, proceed 8.9 km (5.5 mi) east on
highway 12 from Rio Vista Bridge to the Brannan Island Road exit. Turn left on
Brannan Island Road and follow around in a southerly direction for 5.0 km (3.1
mi) to Korth's Pirates Lair Marina. The tide gauge and staff were located 20
meters NW of the gas dock, on the west side of the foot ramp which must be
crossed to arrive at the gas dock. The gauge and staff were mounted to two
piles attached to the bulkheading between the fish cleaning station and the foot
ramp. The propretor of the Marina and all property surrounding the bench marks
is Lloyd Korth. The main office is approximately 50 m (164 ft) NE of the tide
gauge site.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 5229 C 1991
DESIGNATION: 941 5229 C
MONUMENTATION: Bench Mark disk VM#: 15627
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 38° 5.9' N ( 38.09810) LONGITUDE: 121° 34.1' W (-121.56858)
The bench mark is located in Pirates Lair Mobile Home Park, 44.2 m (144.9 ft)
ENE of concrete sewage tank, 35.3 m (116.5 ft) north of the centerline of
Brannan Island Rd., and 3.2 m (10.5 ft) north of a wooden fence. The bench mark
is set atop the NE corner of the center concrete foundation of a steel
transmission tower and sits 0.6 m (2.0 ft) above the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 9415229 PUBLICATION DATE: 09/28/2016
Name: KORTHS HBR, SAN JOAQUIN RIVER
CA
NOAA Chart: 18661 Latitude: 38° 5.9' N ( 38.09761)
USGS Quad: BOULDIN ISLAND Longitude: 121° 34.1' W (-121.56838)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5229 B 1991
DESIGNATION: 941 5229 B
MONUMENTATION: Bench Mark disk VM#: 15626
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 38° 5.9' N ( 38.09782) LONGITUDE: 121° 34.1' W (-121.56903)
The bench mark is located in Pirates Lair Mobile Home Park, 44.2 m (144.9 ft)
WSW of the steel transmission tower, 29.4 m (96.3 ft) north of the centerline of
Brannan Island Rd., 16.6 m (54.4 ft) east of fence dividing two mobile home
parks, and 5.8 m (18.9 ft) north of the north side of a 6 m x 9 m (20 ft x 30
ft) utility building. The bench mark is set in the concrete foundation of a
sewage tank set flush with the parking lot.
BENCH MARK STAMPING: 5229 D 1991
DESIGNATION: 941 5229 D
MONUMENTATION: Bench Mark disk VM#: 15628
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 38° 8.9' N ( 38.14900) LONGITUDE: 121° 34.1' W (-121.56880)
The bench mark is located 117.8 m (386.5 ft) NW of the northern corner of the
Pirates Lair Harbor Master s Office, 96.2 m (315.7 ft) west of the centerline of
Brannan Island Rd., 11.1 m (36.5 ft) west of the centerline of paved driveway
and 9.8 m (32.0 ft) east of the eastern shoreline of lagoon. The bench mark is
set in the SE corner of a concrete slab flush with the grass.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 9415229 PUBLICATION DATE: 09/28/2016
Name: KORTHS HBR, SAN JOAQUIN RIVER
CA
NOAA Chart: 18661 Latitude: 38° 5.9' N ( 38.09761)
USGS Quad: BOULDIN ISLAND Longitude: 121° 34.1' W (-121.56838)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5229 E 1991
DESIGNATION: 941 5229 E
MONUMENTATION: Bench Mark disk VM#: 15629
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 38° 6.0' N ( 38.10035) LONGITUDE: 121° 34.2' W (-121.56963)
The bench mark is located 180 m (591 ft) west of the centerline of Brannan
Island Rd., 22.2 m (73.0 ft) south of a wooden fence, 19.6 m (64.3 ft) north of
the northern shore of lagoon, and 4.94 m (16.2 ft) north of the SW corner of the
Korth Residence. The bench mark is set in the concrete foundation of the
residence 0.2 m (0.7 ft) above the ground.
BENCH MARK STAMPING: 5229 KORTH 2014
MONUMENTATION: Bench Mark disk VM#: 22045
AGENCY: U.S. Army Corps of Engineers (USACE) IDB PID#:
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 38° 5.9' N ( 38.09770) LONGITUDE: 121° 34.1' W (-121.56838)
The bench mark is located in Pirates Lair Marina, 29.0 m (95.1 ft) north of the
SW corner of fuel dock, 15.45 m (50.7 ft) south of the centerline of Brannan
Island Rd., 10.8 m (35.4 ft) ENE from the light pole, and 0.15 m (0.5 ft) west
of the NE corner of concrete slab. The bench mark is set in concrete flush with
the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 9415229 PUBLICATION DATE: 09/28/2016
Name: KORTHS HBR, SAN JOAQUIN RIVER
CA
NOAA Chart: 18661 Latitude: 38° 5.9' N ( 38.09761)
USGS Quad: BOULDIN ISLAND Longitude: 121° 34.1' W (-121.56838)
T I D A L D A T U M S
Tidal datums at KORTHS HBR, SAN JOAQUIN RIVER based on:
LENGTH OF SERIES: 2 MONTHS
TIME PERIOD: January 2015 - February 2015
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 9415144 PORT CHICAGO, SUISUN BAY
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.974
MEAN HIGH WATER MHW = 0.838
MEAN SEA LEVEL MSL = 0.487
MEAN TIDE LEVEL MTL = 0.486
MEAN LOW WATER MLW = 0.134
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
5229 C 1991 0.356 -0.482
5229 B 1991 -0.121 -0.959
5229 D 1991 -0.788 -1.626
5229 E 1991 -0.611 -1.449
5229 KORTH 2014 1.385 0.547
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 9415229 PUBLICATION DATE: 09/28/2016
Name: KORTHS HBR, SAN JOAQUIN RIVER
CA
NOAA Chart: 18661 Latitude: 38° 5.9' N ( 38.09761)
USGS Quad: BOULDIN ISLAND Longitude: 121° 34.1' W (-121.56838)
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.