U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 8
Station ID: 8417144 PUBLICATION DATE: 07/05/2016
Name: AUGUSTA, MCRR BRIDGE, KENNEBEC RIVER
ME
NOAA Chart: 13297 Latitude: 44° 19.2' N ( 44.32000)
USGS Quad: Augusta Longitude: 69° 46.2' W ( -69.77028)
To reach the tidal bench marks from the U.S. Post Office at 295 Water Street,
proceed north 0.3 km (0.2 mi) to the intersection with Bridge Street, turn right
and proceed 0.2 km (0.1 mi) east across the Kennebec River to the first
intersection with Willow Street, turn left and proceed 0.3 km (0.2 mi) north on
Willow Street to the ninety degree turn, continue straight 60 m (200 ft) north
on the private driveway entrance to a scrap yard, continue straight on foot 0.14
km (0.09 mi) to the east end of the decommissioned railroad bridge over the
Kennebec River. The bench marks are located between the east end of the railroad
bridge and south along Water Street to the west end of the State Route 17 bridge
over the Kennebec River. The tide gauge is located on the decommissioned
railroad bridge about 85 m (275 ft) west of the east end of the bridge. The tide
gauge can also be accessed from the west end of the bridge through public
property.
T I D A L B E N C H M A R K S
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 8
Station ID: 8417144 PUBLICATION DATE: 07/05/2016
Name: AUGUSTA, MCRR BRIDGE, KENNEBEC RIVER
ME
NOAA Chart: 13297 Latitude: 44° 19.2' N ( 44.32000)
USGS Quad: Augusta Longitude: 69° 46.2' W ( -69.77028)
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: C 510 1975
DESIGNATION: C 510
MONUMENTATION: DD VM#: 21459
AGENCY: Maine Department of Transportation IDB PID#: PE1370
SETTING CLASSIFICATION: Massive structures (other than those
listed below) OPUS PID:
LATITUDE: 44° 19.0' N ( 44.31697) LONGITUDE: 69° 46.4' W ( -69.77300)
The primary bench mark is a disk set in the W concrete bridge abutment on the N
side of bridge street, 22.69 m (74.4 ft) WNW of W most light post on N side of
bridge, 17.08 m (56.0 ft) ESE of the SW corner of brick building at 169 water
street, 8.81 m (28.9 ft) E of gas valve cap in middle of sidewalk on N side of
bridge street, 8.74 m (28.7 ft) NNE of the centerline of bridge street at W
bridge abutment and 0.82 m (2.7 ft) W of the SE corner of a brick building at
169 water street.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 8
Station ID: 8417144 PUBLICATION DATE: 07/05/2016
Name: AUGUSTA, MCRR BRIDGE, KENNEBEC RIVER
ME
NOAA Chart: 13297 Latitude: 44° 19.2' N ( 44.32000)
USGS Quad: Augusta Longitude: 69° 46.2' W ( -69.77028)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: C 511 1975
DESIGNATION: C 511
MONUMENTATION: DD VM#: 21460
AGENCY: Maine Department of Transportation IDB PID#: PE1371
SETTING CLASSIFICATION: Light structures (other than those
listed below) OPUS PID:
LATITUDE: 44° 19.1' N ( 44.31806) LONGITUDE: 69° 46.4' W ( -69.77344)
The bench mark is a disk set in the top of the N end of a concrete retaining
wall that runs along the W side of the angled parking on commercial street at
water street, 23.30 m (76.4 ft) NNW of fire hydrant on the S acute corner of the
intersection of commercial and water street, 20.30 m (66.6 ft) SSW of decorative
double light post on the W side of water street south of rail bridge, 8.46 m
(27.8 ft) SSE of N end of guardrail along S side of public access road created
by removal of train tracks, 1.41 m (4.6 ft) N of power pole at the N end of
angled parking area and 0.21 m (0.7 ft) SSW of N end of retaining wall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 8
Station ID: 8417144 PUBLICATION DATE: 07/05/2016
Name: AUGUSTA, MCRR BRIDGE, KENNEBEC RIVER
ME
NOAA Chart: 13297 Latitude: 44° 19.2' N ( 44.32000)
USGS Quad: Augusta Longitude: 69° 46.2' W ( -69.77028)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: C 509 1975
DESIGNATION: C 509
MONUMENTATION: DD VM#: 21461
AGENCY: Maine Department of Transportation IDB PID#: PE1369
SETTING CLASSIFICATION: Light structures (other than those
listed below) OPUS PID:
LATITUDE: 44° 18.9' N ( 44.31469) LONGITUDE: 69° 46.4' W ( -69.77408)
The bench mark is a disk set in concrete on the NE corner of the retaining wall
of the U.S. post office loading dock area, 13.47 m (44.2 ft) ESE of the W end of
metal hand rail along retaining N wall, 13.40 m (44.0 ft) E of the NW corner of
concrete loading dock, 11.47 m (37.6 ft) SW of the SW corner of the Augusta
parking district building at 1 Winthrop street, 6.90 m (22.6 ft) W of man hole
cover, 3.70 m (12.1 ft) NNE of the NE corner of the concrete loading dock and
2.3 m (7.5 ft) above street.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 8
Station ID: 8417144 PUBLICATION DATE: 07/05/2016
Name: AUGUSTA, MCRR BRIDGE, KENNEBEC RIVER
ME
NOAA Chart: 13297 Latitude: 44° 19.2' N ( 44.32000)
USGS Quad: Augusta Longitude: 69° 46.2' W ( -69.77028)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: C 506 1975
DESIGNATION: C 506
MONUMENTATION: DD VM#: 21462
AGENCY: Maine Department of Transportation IDB PID#: PE1368
SETTING CLASSIFICATION: Abutments and piers of large bridges OPUS PID:
LATITUDE: 44° 18.7' N ( 44.31158) LONGITUDE: 69° 46.5' W ( -69.77494)
The bench mark is a disk set vertically in a concrete wall bordering a sidewalk
on the N side of the W end of the Route 100 and 17 bridge over the Kennebec
river, 37.69 m (123.7 ft) NE of street light pole on the N side of Memorial
drive between Swan street and Gage street, 22.65 m (74.3 ft) E of power pole on
the W side of Gage street where it forks approaching Memorial drive, 12.72 m
(41.7 ft) NE of a street sign on the concrete island in the middle of Gage
street at Memorial drive, 11.01 m (36.1 ft) W of the N end of the expansion
joint on the W end of the bridge and 5.20 m (17.1 ft) SSE of power pole on the E
side of Gage street and about 0.42 m (1.4 ft) higher than the sidewalk.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 8
Station ID: 8417144 PUBLICATION DATE: 07/05/2016
Name: AUGUSTA, MCRR BRIDGE, KENNEBEC RIVER
ME
NOAA Chart: 13297 Latitude: 44° 19.2' N ( 44.32000)
USGS Quad: Augusta Longitude: 69° 46.2' W ( -69.77028)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: G 31 1935
DESIGNATION: G 31
MONUMENTATION: DB VM#: 21463
AGENCY: US Coast & Geodetic Survey IDB PID#: PE1204
SETTING CLASSIFICATION: Massive structures (other than those
listed below) OPUS PID:
LATITUDE: 44° 19.2' N ( 44.32017) LONGITUDE: 69° 46.2' W ( -69.76942)
The bench mark is a disk set in the S side of the concrete bridge abutment on
the E side of the bridge, 19.80 m (65.0 ft) E of the metal hand rail structure
on N side of bridge, 18.75 m (61.5 ft) NE of the S end of the E most bridge
support, 9.85 m (32.3 ft) SSE of the NW corner of bridge abutment and 1.50 m
(4.9 ft) SSE of S most rail of train tracks.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 8
Station ID: 8417144 PUBLICATION DATE: 07/05/2016
Name: AUGUSTA, MCRR BRIDGE, KENNEBEC RIVER
ME
NOAA Chart: 13297 Latitude: 44° 19.2' N ( 44.32000)
USGS Quad: Augusta Longitude: 69° 46.2' W ( -69.77028)
T I D A L D A T U M S
Tidal datums at AUGUSTA, MCRR BRIDGE, KENNEBEC RIVER based on:
LENGTH OF SERIES: 2 MONTHS
TIME PERIOD: May 2015 - June 2015
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8418150 PORTLAND, CASCO BAY
Elevations of tidal datums referred to Mean High Water (MHW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.101
MEAN HIGH WATER MHW = 0.000
North American Vertical Datum NAVD88 = -1.530
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MHW
C 510 1975 9.780
C 511 1975 12.883
C 509 1975 9.043
C 506 1975 28.661
G 31 1935 16.184
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 8 of 8
Station ID: 8417144 PUBLICATION DATE: 07/05/2016
Name: AUGUSTA, MCRR BRIDGE, KENNEBEC RIVER
ME
NOAA Chart: 13297 Latitude: 44° 19.2' N ( 44.32000)
USGS Quad: Augusta Longitude: 69° 46.2' W ( -69.77028)
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.