U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 8551762 PUBLICATION DATE: 12/15/2020
Name: DELAWARE CITY, DELAWARE RIVER
DE
NOAA Chart: 12311 Latitude: 39° 34.9' N ( 39.58170)
USGS Quad: DELAWARE CITY Longitude: 75° 35.3' W ( -75.58830)
To reach the tidal bench marks from the intersection of Highway 13 and Route 9
in New Castle, turn east on Route 9 and follow to Delaware City. At the light
in Delaware City and Clinton Street turn left (north) and proceed through town
to the end of the street and the river. Turn left and then right to the gate of
the Motiva Fuel docks. Proceed through the gate and to the station on the right
on the first dock. The station is halfway down the dock on the catwalk. The
bench marks are in the vicinity of the pier and the road.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 1762 C 2001
DESIGNATION: 855 1762 C
MONUMENTATION: Flange-encased Rod VM#: 16618
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID:
LATITUDE: 39° 34.9' N ( 39.58247) LONGITUDE: 75° 35.4' W ( -75.59081)
The primary bench mark is a flange-encased rod located just north of the first
fuel dock after the guard shack, 45.70 m (149.9 ft) SSE of power pole No. PS75,
38.20 m (125.3 ft) WNW of the fuel dock of the first pier past the guard shack,
5.0 m (16.4 ft) SW of the center line of the road leading to the pier, 0.7 m
(2.3 ft) NNE of power pole NO. PS76. The datum point is set 0.3 m (1 ft) below
ground, being the top of a 3-D rod mark driven 17.1 m (56 ft) to refusal, in a
sleeve extending to a depth of 1.2 m (4 ft) with grease, and aluminum access
cover flush with the ground, and NOAA witness post.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 8551762 PUBLICATION DATE: 12/15/2020
Name: DELAWARE CITY, DELAWARE RIVER
DE
NOAA Chart: 12311 Latitude: 39° 34.9' N ( 39.58170)
USGS Quad: DELAWARE CITY Longitude: 75° 35.3' W ( -75.58830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1762 A 2001
DESIGNATION: 855 1762 A
MONUMENTATION: Tidal Station disk VM#: 16619
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Concrete cell OPUS PID:
LATITUDE: 39° 34.9' N ( 39.58211) LONGITUDE: 75° 35.3' W ( -75.58889)
The bench mark is a disk set in a concrete cell of the Motiva Fuel Docks, set in
the SE corner on the second cell (east) down the catwalk, 4.70 m (15.4 ft) SSE
of the north side of the cell, 2.70 m (8.9 ft) SSW of the east side of the cell,
0.25 m (0.8 ft) NNW of the south side, and on the first T-shaped pier past the
guard shack.
BENCH MARK STAMPING: 1762 B 2001
DESIGNATION: 855 1762 B
MONUMENTATION: Tidal Station disk VM#: 16620
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Bollard foundation OPUS PID:
LATITUDE: 39° 35.0' N ( 39.58303) LONGITUDE: 75° 35.4' W ( -75.58944)
The bench mark is a disk set in a concrete pad for a bollard near the center of
the pier, 17.70 m (58.1 ft) SSW of the second bollard west of the center, on the
T-shaped fuel dock past the guard shack, 12.70 m (41.7 ft) ENE of the southern
inside corner of the T-shaped pier, and 12.20 m (40.0 ft) NNW of the SE corner
of the T.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 8551762 PUBLICATION DATE: 12/15/2020
Name: DELAWARE CITY, DELAWARE RIVER
DE
NOAA Chart: 12311 Latitude: 39° 34.9' N ( 39.58170)
USGS Quad: DELAWARE CITY Longitude: 75° 35.3' W ( -75.58830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1762 D 2001
DESIGNATION: 855 1762 D
MONUMENTATION: Flange-encased Rod VM#: 16621
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID:
LATITUDE: 39° 34.9' N ( 39.58161) LONGITUDE: 75° 35.4' W ( -75.58961)
The bench mark is a flange-encased rod located near the guard shack and the
first fuel pier, 45.75 m (150.1 ft) SSE of power pole No. PS78, 45.40 m (148.95
ft) NW of power pole No. PS80, 4.85 m (15.9 ft) SW of the center line of the
road that leads onto the property, and 1.35 m (4.4 ft) ENE of power pole No.
PS79. The datum point is set 0.3 m (1 ft) below ground, being the top of a 3-D
rod mark driven 17.1 m (56 ft) to refusal, in a sleeve extending to a depth of
1.2 m (4 ft) with grease, and aluminum access cover flush with the ground.
BENCH MARK STAMPING: 1762 E 2001
DESIGNATION: 855 1762 E
MONUMENTATION: Flange-encased Rod VM#: 16622
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID#: BBDD14
LATITUDE: 39° 34.9' N ( 39.58103) LONGITUDE: 75° 35.3' W ( -75.58883)
The bench mark is a flange-encased rod located near the guard shack and the
entrance gate and power pole No. PS81, 46.30 m (151.9 ft) WNW of the NW corner
of the guard shack, 37.70 m (123.7 ft) NNW of the NE corner of a brick building,
5.40 m (17.7 ft) WSW of the center line of the road leading onto the property,
and 2.10 m (6.9 ft) SE of power pole No. PS81. The datum point is set 0.3 m (1
ft) below ground, being the top of a 3-D rod mark driven 17.1 m (56 ft) to
refusal, in a sleeve extending to a depth of 1.2 m (4 ft) with grease, and
aluminum access cover flush with the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 8551762 PUBLICATION DATE: 12/15/2020
Name: DELAWARE CITY, DELAWARE RIVER
DE
NOAA Chart: 12311 Latitude: 39° 34.9' N ( 39.58170)
USGS Quad: DELAWARE CITY Longitude: 75° 35.3' W ( -75.58830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8989 F 2016
DESIGNATION: 855 1762 F
MONUMENTATION: Tidal Station disk VM#: 22141
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Concrete bridge OPUS PID:
LATITUDE: 39° 35.0' N ( 39.58339) LONGITUDE: 75° 35.5' W ( -75.59222)
The bench mark is a surface disk installed on the SW corner of the bridge that
crosses Dragon creek towards the refinery dock office, is located 36.5 m (119.8
ft) SE of the SE corner of the pump house, 12.5 m (41.0 ft) NW of the first
telephone pole south of the bridge crossing Dragon creek, and 0.45 m (1.5 ft) NE
of the SW edge of the bridge. The bench mark is set flush with the bridge curb
surface.
BENCH MARK STAMPING: 1762 G 2016
DESIGNATION: 855 1762 G
MONUMENTATION: Tidal Station disk VM#: 22142
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Concrete dolphin OPUS PID:
LATITUDE: 39° 35.0' N ( 39.58336) LONGITUDE: 75° 35.4' W ( -75.59011)
The bench mark is a surface disk installed on the west corner of dock #3 located
10.8 m (35.4 ft) SW from the center of the NE tie off bollard on dock #3, 5.5 m
(18.0 ft) NW from the center of the SW tie off bollard on dock #3, and 0.3 m
(1.0 ft) SE from the NW edge of dock #3. The bench mark is set flush with the
dock surface.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 8551762 PUBLICATION DATE: 12/15/2020
Name: DELAWARE CITY, DELAWARE RIVER
DE
NOAA Chart: 12311 Latitude: 39° 34.9' N ( 39.58170)
USGS Quad: DELAWARE CITY Longitude: 75° 35.3' W ( -75.58830)
T I D A L D A T U M S
Tidal datums at DELAWARE CITY, DELAWARE RIVER based on:
LENGTH OF SERIES: 17 YEARS
TIME PERIOD: November 2001 - October 2018
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8551910 REEDY POINT, C&D CANAL
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (10/30/2012) = 2.966
MEAN HIGHER HIGH WATER MHHW = 1.829
MEAN HIGH WATER MHW = 1.713
MEAN SEA LEVEL MSL = 0.901
MEAN TIDE LEVEL MTL = 0.884
MEAN LOW WATER MLW = 0.054
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (01/07/2018) = -1.089
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
1762 C 2001 3.173 1.460
1762 A 2001 4.159 2.446
1762 B 2001 4.352 2.639
1762 D 2001 3.396 1.683
1762 E 2001 3.381 1.668
8989 F 2016 4.304 2.591
1762 G 2016 4.139 2.426
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 8551762 PUBLICATION DATE: 12/15/2020
Name: DELAWARE CITY, DELAWARE RIVER
DE
NOAA Chart: 12311 Latitude: 39° 34.9' N ( 39.58170)
USGS Quad: DELAWARE CITY Longitude: 75° 35.3' W ( -75.58830)
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.