U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 8593909 PUBLICATION DATE: 09/30/2010
Name: EAST LAKE, ANACOSTIA RIVER
DC
NOAA Chart: 12285 Latitude: 38° 54.6' N ( 38.91000)
USGS Quad: WASHINGTON EAST Longitude: 76° 57.3' W ( -76.95500)
To reach the tidal bench marks from the intersection of Kenilworth Avenue and
40th Street NE, proceed 0.5 km (0.3 mi) NW along 40th Street (continue past its
merger with Lee Street) to Anacostia Avenue, proceed 0.9 km (0.6 mi) to the
public entrance to the Kenilworth Aquatic Gardens. Enter gate and proceed 0.2
km (0.1 mi) to the north corner of parking lot, turn onto gravel drive and
follow drive for 0.3 km (0.2 mi), turn right at drive intersection leading to
employee parking and visitor's center and proceed 0.2 km (0.1 mi) to entrance to
river trail, continue another 1.0 km (0.6 mi) to end of trail. The bench marks
are located along the river trail, in the vicinity of the parking lot near the
front entrance to the Gardens, and along Anacostia Avenue. The gage and shelter
were located on a 4' x 4' platform in the channel just SE of the inlet
connecting East Lake to the Anacostia River.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 3909 A 1995
DESIGNATION: 859 3909 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 12731
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 38° 54.6' N ( 38.91000) LONGITUDE: 76° 57.3' W ( -76.95500)
The primary bench mark is a disk crimped to a stainless steel rod, located near
the canoe launch area of the Kenilworth Aquatic Gardens, 33.80 m (110.9 ft)
south of sign post marking the entrance to the river trail, 10.40 m (34.1 ft) SE
of end of tree row, 9.40 m (30.8 ft) NE of a 50 cm dia. Sycamore tree on NE side
of gravel drive leading to the canoe launch and river trail, and 0.55 m (1.8 ft)
north of a witness post. The bench mark is crimped to a stainless steel rod
driven 10.97 m (36.0 ft) to refusal, and encased in a 5-inch PVC pipe with
concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 8593909 PUBLICATION DATE: 09/30/2010
Name: EAST LAKE, ANACOSTIA RIVER
DC
NOAA Chart: 12285 Latitude: 38° 54.6' N ( 38.91000)
USGS Quad: WASHINGTON EAST Longitude: 76° 57.3' W ( -76.95500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 3909 B 1995
DESIGNATION: 859 3909 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 12732
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 38° 54.6' N ( 38.91000) LONGITUDE: 76° 57.3' W ( -76.95500)
The bench mark is a disk crimped to a stainless steel rod, located in a picnic
area just north of the Kenilworth Aquatic Gardens parking lot, 54.6 m (179.0 ft)
SW of chainlink fence along edge of Aquatic Gardens nursery, 37.01 m (121.4 ft)
west of the westernmost of two concrete water fountains, 16.30 m (53.5 ft) SW of
a sanitary sewer manhole in a grove of Pin Cherry trees, 3.90 m (12.8 ft) NE of
a 50 CM dia. Walnut tree (of two), and 0.60 m (2.0 ft) NE of a witness post.
The bench mark is crimped to a stainless steel rod driven 11.58 m (38.0 ft) to
refusal, and encased in a 5-inch PVC pipe with kickblock.
BENCH MARK STAMPING: 3909 C 1995
DESIGNATION: 859 3909 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 12733
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 38° 54.6' N ( 38.91000) LONGITUDE: 76° 57.3' W ( -76.95500)
The bench mark is a disk crimped to a stainless steel rod, located near the
visitor entrance gate to the Kenilworth Aquatic Gardens, 14.76 m (48.6 ft) NW of
centerline of Anacostia Ave. NE, 7.36 m (24.1 ft) SW of centerline of the
driveway into the parking lot, and 4.45 m (14.6 ft) SE of a chainlink fence.
The bench mark is crimped to a stainless steel rod driven 12.20 m (40.0 ft) to
refusal, and encased in a 5-inch PVC pipe with concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 8593909 PUBLICATION DATE: 09/30/2010
Name: EAST LAKE, ANACOSTIA RIVER
DC
NOAA Chart: 12285 Latitude: 38° 54.6' N ( 38.91000)
USGS Quad: WASHINGTON EAST Longitude: 76° 57.3' W ( -76.95500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 3909 D 1995
DESIGNATION: 859 3909 D TIDAL
MONUMENTATION: Survey disk VM#: 12734
AGENCY: US Army Corps of Engineers (USE) IDB PID#:
SETTING CLASSIFICATION: Aluminum alloy rod OPUS PID:
LATITUDE: 38° 54.6' N ( 38.91000) LONGITUDE: 76° 57.3' W ( -76.95500)
The bench mark is a disk crimped to the top of an aluminum rod, located near the
end of the dirt road leading to the marsh inlet off the Anacostia River, 21.40 m
(70.2 ft) NNE of the berm on the edge of the marsh, 13.81 m (45.3 ft) ENE of a
three-trunked wild cherry tree, 14.60 m (47.9 ft) south of the centerline of the
dirt road, and 0.61 m (2.0 ft) south of a witness post. The bench mark is 0.09 m
(0.3 ft) above ground level, crimped to the top of an aluminum rod driven 12.19
m (40.0 ft) to substantial resistance, and encased in a 5-inch PVC pipe and
concrete kickblock.
BENCH MARK STAMPING: NO. 1 TIDAL 1992
DESIGNATION: 859 3909 TIDAL 1
MONUMENTATION: Survey disk VM#: 12735
AGENCY: US Army Corps of Engineers (USE) IDB PID#:
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 38° 54.6' N ( 38.91000) LONGITUDE: 76° 57.3' W ( -76.95500)
The bench mark is a disk set flush in a concrete-filled 4-inch PVC pipe which is
part of an irregular poured mass of concrete of unspecified dimensions,
approximately 1.22 m (4 ft) deep, along the west side of Anacostia Avenue NE,
74.10 m (243.1 ft) SW of the southern corner of the intersection of Anacostia
Avenue and Douglas Street, 18.85 m (61.8 ft) north of a wing wall of a concrete
culvert, and 13.00 m (42.7 ft) NW of the centerline of Anacostia Avenue, and at
ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 8593909 PUBLICATION DATE: 09/30/2010
Name: EAST LAKE, ANACOSTIA RIVER
DC
NOAA Chart: 12285 Latitude: 38° 54.6' N ( 38.91000)
USGS Quad: WASHINGTON EAST Longitude: 76° 57.3' W ( -76.95500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO. 2 TIDAL 1992
DESIGNATION: 859 3909 TIDAL 2
MONUMENTATION: Survey disk VM#: 12736
AGENCY: US Army Corps of Engineers (USE) IDB PID#:
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 38° 54.6' N ( 38.91000) LONGITUDE: 76° 57.3' W ( -76.95500)
The bench mark is a disk set flush in a concrete filled 4-inch PVC pipe which is
part of an irregular poured mass of concrete of unspecified dimensions,
approximately 1.22 m (4 ft) deep, located along the west side of Anacostia
Avenue NE between Quarles Street and Ponds Street, 16.90 m (55.4 ft) NW of
centerline of driveway to Aquatic Gardens Nursery, 1.00 m (3.3 ft) SE of
chainlink fence, and at ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 8593909 PUBLICATION DATE: 09/30/2010
Name: EAST LAKE, ANACOSTIA RIVER
DC
NOAA Chart: 12285 Latitude: 38° 54.6' N ( 38.91000)
USGS Quad: WASHINGTON EAST Longitude: 76° 57.3' W ( -76.95500)
T I D A L D A T U M S
Tidal datums at EAST LAKE, ANACOSTIA RIVER based on:
LENGTH OF SERIES: 2 MONTHS
TIME PERIOD: August 1995 - September 1995
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8594900 WASHINGTON, POTOMAC RIVER
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 1.008
MEAN HIGH WATER MHW = 0.937
MEAN TIDE LEVEL MTL = 0.490
MEAN SEA LEVEL MSL = 0.478
MEAN LOW WATER MLW = 0.042
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
3909 A 1995 1.560 0.623
3909 B 1995 5.420 4.483
3909 C 1995 6.660 5.723
3909 D 1995 2.350 1.413
NO. 1 TIDAL 1992 3.925 2.988
NO. 2 TIDAL 1992 7.083 6.146
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 8593909 PUBLICATION DATE: 09/30/2010
Name: EAST LAKE, ANACOSTIA RIVER
DC
NOAA Chart: 12285 Latitude: 38° 54.6' N ( 38.91000)
USGS Quad: WASHINGTON EAST Longitude: 76° 57.3' W ( -76.95500)
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.