U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 8
Station ID: 9452210 PUBLICATION DATE: 11/06/2007
Name: JUNEAU, GASTINEAU CHANNEL, STEPHENS PASS
ALASKA
NOAA Chart: 17315 Latitude: 58° 17.9' N
USGS Quad: JUNEAU B-2 Longitude: 134° 24.7' W
To reach the tidal bench marks from the main Juneau Post Office main entrance at
9th and D Streets, proceed SW one block to Glacier Avenue, turn left onto
Glacier Avenue and proceed 0.2 km (0.1 mi), bear left at the Y intersection onto
Willoughby Avenue and follow it 0.3 km (0.2 mi) to Whittier Street, turn right
onto Whittier Street and proceed 0.4 km (0.3 mi) (across Egan Drive) to the U.S.
Coast Guard Pier. The bench marks are in the general vicinity. Turn right (SW)
from the main Coast Guard pier and proceed 73.15 m (240.0 ft) to the tide house.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING:
DESIGNATION: 945 2210 TIDAL 8
ALIAS: 8 1922
MONUMENTATION: Tidal Station disk VM#: 1188
AGENCY: US Coast and Geodetic Survey (USC&GS) PID:
SETTING CLASSIFICATION: Building
The primary bench mark is an unstamped disk set vertically in the SE corner of
the Goldstein Emporium Building on the west side of Seward Street between Front
and Second Streets, 5.18 m (17.0 ft) south of the entrance to Miss Scarlett's
Flower Shop, in a niche 0.15 m (0.5 ft) back from the east face of the building,
and 0.15 m (0.5 ft) above the sidewalk.
BENCH MARK STAMPING: 12 1945
DESIGNATION: 945 2210 TIDAL 12
MONUMENTATION: Tidal Station disk VM#: 1191
AGENCY: US Coast and Geodetic Survey (USC&GS) PID:
SETTING CLASSIFICATION: Concrete facade
The bench mark is a disk set in top of the concrete facade of the Key Bank at
the SW corner of Third and Seward Streets, midway between two concrete columns
resting on the facade on the north side of the eastern entrance to the bank,
0.12 m (0.4 ft) from the wall of the building, and 0.67 m (2.2 ft) above the
sidewalk.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 8
Station ID: 9452210 PUBLICATION DATE: 11/06/2007
Name: JUNEAU, GASTINEAU CHANNEL, STEPHENS PASS
ALASKA
NOAA Chart: 17315 Latitude: 58° 17.9' N
USGS Quad: JUNEAU B-2 Longitude: 134° 24.7' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 2210 C 1982
DESIGNATION: 945 2210 C
MONUMENTATION: Tidal Station disk VM#: 1196
AGENCY: National Ocean Survey (NOS) PID:
SETTING CLASSIFICATION: Rock outcrop
The bench mark is a disk set in a rock outcrop that is located on the SE corner
of the State Archives and Records Center Building on Willoughby Street, 2.65 m
(8.7 ft) SW of a white witness sign nailed on the entrance of a mine shaft, 2.59
m (8.5 ft) SW of a wooden door that covers an old mine shaft, 0.40 m (1.3 ft)
east of the building, and 0.30 m (1.0 ft) above ground level.
BENCH MARK STAMPING: 2210 D 1984
DESIGNATION: 945 2210 D
MONUMENTATION: Tidal Station disk VM#: 1197
AGENCY: National Ocean Service (NOS) PID:
SETTING CLASSIFICATION: Concrete rail
The bench mark is a disk set on top of the west concrete rail bordering a brick
ramp that leads to the north entrance of the First Bank Building located at
Front and Seward Streets, 49.83 m (163.5 ft) SE of the centerline of Front
Street, 23.47 m (77.0 ft) SW of the centerline of Seward Street, 12.34 m (40.5
ft) NW of the recessed NE corner of the First Bank Building, 9.57 m (31.4 ft) NE
of a night deposit box on the NW side of First Bank, and 0.94 m (3.1 ft) above
the level of the ramp.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 8
Station ID: 9452210 PUBLICATION DATE: 11/06/2007
Name: JUNEAU, GASTINEAU CHANNEL, STEPHENS PASS
ALASKA
NOAA Chart: 17315 Latitude: 58° 17.9' N
USGS Quad: JUNEAU B-2 Longitude: 134° 24.7' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 2210 E 1984
DESIGNATION: 945 2210 E
MONUMENTATION: Tidal Station disk VM#: 1198
AGENCY: National Ocean Service (NOS) PID:
SETTING CLASSIFICATION: Concrete slab
The bench mark is a disk set in a concrete slab on the second parking level
adjacent to the grass knoll that surrounds the entrance to the State Office
Building located at Willoughby Street, 23.87 m (78.3 ft) NE of the centerline of
Willoughby Street, 21.64 m (71.0 ft) east of the northwestern-most of two flag
poles on the south face of the building, 10.21 m (33.5 ft) SE of the center of
the seal of the State of Alaska measured from the L in Alaska, 0.40 m (1.3 ft)
below the lower edge of the 0.3 m x 0.67 m (1 ft x 2.2 ft) concrete guard rail
surrounding the parking area, and 0.30 m (1.0 ft) above the ground.
BENCH MARK STAMPING: 2210 G 1984
DESIGNATION: 945 2210 G
MONUMENTATION: Tidal Station disk VM#: 1200
AGENCY: National Ocean Service (NOS) PID:
SETTING CLASSIFICATION: Rock outcrop
The bench mark is a disk set in a bed rock outcropping behind the NAPA Auto
Supply Building at 47 Egan Road, 39.62 m (130.0 ft) north of the centerline of
Egan Road, 38.56 m (126.5 ft) east of the NE corner of the Goldbelt Hotel, 1.58
m (5.2 ft) north of the NW corner of NAPA Auto Supply Building, 1.34 m (4.4 ft)
west of a white witness sign nailed onto a tree, and approximately 1.37 m (4.5
ft) above the parking lot level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 8
Station ID: 9452210 PUBLICATION DATE: 11/06/2007
Name: JUNEAU, GASTINEAU CHANNEL, STEPHENS PASS
ALASKA
NOAA Chart: 17315 Latitude: 58° 17.9' N
USGS Quad: JUNEAU B-2 Longitude: 134° 24.7' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING:
DESIGNATION: 945 2210 TIDAL 9
ALIAS: 9 1922
MONUMENTATION: Tidal Station disk VM#: 1201
AGENCY: US Coast and Geodetic Survey (USC&GS) PID:
SETTING CLASSIFICATION: Building
The bench mark is an unstamped disk set vertically in the SW corner of the
Gastineau Apartments on South Franklin Street at Front Street, 12.01 m (39.4 ft)
NW of the NW corner of a covered bus stop, 2.90 m (9.5 ft) east of a street
lamp, and 0.09 m (0.3 ft) above the sidewalk.
BENCH MARK STAMPING: 2210 J 1997
DESIGNATION: 945 2210 J
MONUMENTATION: Tidal Station disk VM#: 13761
AGENCY: National Ocean Service (NOS) PID:
SETTING CLASSIFICATION: Bedrock
The bench mark is a disk set in a bedrock outcropping SW of the pay parking lot
at the corner of Egan Drive and Main Street, 35 m (114 ft) SW of the centerline
of Main Street, 17 m (55 ft) NW of the NW corner of the NAPA auto parts
building, 14 m (46 ft) SE of a concrete retaining wall located behind the bus
stop on Main Street, 2.38 m (7.8 ft) SW of the edge of the asphalt parking lot
(between pay stalls 31 & 32), and 0.88 m (2.9 ft) above ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 8
Station ID: 9452210 PUBLICATION DATE: 11/06/2007
Name: JUNEAU, GASTINEAU CHANNEL, STEPHENS PASS
ALASKA
NOAA Chart: 17315 Latitude: 58° 17.9' N
USGS Quad: JUNEAU B-2 Longitude: 134° 24.7' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 2210 H 1997
DESIGNATION: 945 2210 H
MONUMENTATION: Tidal Station disk VM#: 13762
AGENCY: National Ocean Service (NOS) PID:
SETTING CLASSIFICATION: Bedrock
The bench mark is a disk set in a bedrock outcropping behind the Goldbelt Hotel
at 53 Egan Drive, 13 m (44 ft) WNW of the NE corner of hotel building, 3.84 m
(12.6 ft) north of the back wall, 3 m (11ft) ESE of the concrete ruins of the
old building foundation, and 1.10 m (3.6 ft) above ground level.
BENCH MARK STAMPING: JNU TIDAL GPS 1999
DESIGNATION: 945 2210 JNU TIDAL GPS
MONUMENTATION: Bench Mark disk VM#: 16187
AGENCY: National Geodetic Survey (NGS) PID#: AI4908
SETTING CLASSIFICATION: Concrete foundation
The bench mark is a disk set in a 2.43 m (8.0 ft) diameter concrete foundation
for a sewer manohole, 35 m (115 ft) south (177 degrees magnetic) from the SW
corner of Foodland Center Super Market, 9.60 m (31.5 ft) NE (75 degrees
magnetic) from the NE corner of concrete bridge spanning Gold creek, 9.10 m
(29.9 ft) north (10 degrees magnetic) from the centerline of west bound Egan
Drive, and 0.91 m (3.0 ft) east (107 degrees magnetic) from the east edge of a
0.15 m (0.5 ft) diameter candy cane vent produding from the manhole.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 8
Station ID: 9452210 PUBLICATION DATE: 11/06/2007
Name: JUNEAU, GASTINEAU CHANNEL, STEPHENS PASS
ALASKA
NOAA Chart: 17315 Latitude: 58° 17.9' N
USGS Quad: JUNEAU B-2 Longitude: 134° 24.7' W
T I D A L D A T U M S
Tidal datums at JUNEAU, GASTINEAU CHANNEL, STEPHENS PASS based on:
LENGTH OF SERIES: 5 YEARS
TIME PERIOD: January 2002 - December 2006
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION:
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (11/02/1948) = 7.493
MEAN HIGHER HIGH WATER (MHHW) = 4.971
MEAN HIGH WATER (MHW) = 4.676
MEAN SEA LEVEL (MSL) = 2.610
MEAN TIDE LEVEL (MTL) = 2.582
MEAN LOW WATER (MLW) = 0.488
MEAN LOWER LOW WATER (MLLW) = 0.000
LOWEST OBSERVED WATER LEVEL (01/12/2005) = -1.689
National Geodetic Vertical Datum (NGVD 29)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
945 2210 TIDAL 8 11.934 7.258
12 1945 18.302 13.626
2210 C 1982 9.057 4.381
2210 D 1984 10.941 6.265
2210 E 1984 10.439 5.763
2210 G 1984 10.438 5.762
945 2210 TIDAL 9 9.810 5.134
2210 J 1997 9.834 5.158
2210 H 1997 10.088 5.412
JNU TIDAL GPS 1999 8.891 4.215
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 8
Station ID: 9452210 PUBLICATION DATE: 11/06/2007
Name: JUNEAU, GASTINEAU CHANNEL, STEPHENS PASS
ALASKA
NOAA Chart: 17315 Latitude: 58° 17.9' N
USGS Quad: JUNEAU B-2 Longitude: 134° 24.7' W
Foot Notes:
Areas of Alaska have anomalous relative sea level trends compared to most other
geographic regions in the United States. This is due to a general uplift of the
land in this area, which has been occurring at a rapid rate. Because of the
magnitude of the sea level trends in these areas, NOAA has adopted a procedure
for computing accepted tidal datums for the National Water Level Observation
Network (NWLON) using the last several years of sea level data rather than the
19-year tidal epoch. The tide ranges are still based on the 1983-2001 National
Tidal Datum Epoch (NTDE) and are applied to the 5 year (2002-2006) Mean Tide
Level (MTL) to compute other tidal datums. The adoption of this procedure was
necessary to ensure that these tidal datums accurately represent the existing
stand of sea level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 8 of 8
Station ID: 9452210 PUBLICATION DATE: 11/06/2007
Name: JUNEAU, GASTINEAU CHANNEL, STEPHENS PASS
ALASKA
NOAA Chart: 17315 Latitude: 58° 17.9' N
USGS Quad: JUNEAU B-2 Longitude: 134° 24.7' W
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 (NAVD 88).
NGVD 29 is a fixed datum adopted as a national standard geodetic reference for
heights but is now considered superseded. NGVD 29 is sometimes referred to as
Sea Level Datum of 1929 or as Mean Sea Level on some early issues of Geological
Survey Topographic Quads. NGVD 29 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 NGVD 29 are available from the National
Geodetic Survey (NGS) data base via the World Wide Web at
National Geodetic Survey.
NAVD 88 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. NAVD 88 replaces NGVD 29 as the national
standard geodetic reference for heights. Bench mark elevations relative to
NAVD 88 are available from NGS through the World Wide Web at
National Geodetic Survey.
NGVD 29 and NAVD 88 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 NAVD 88 elevation is shown on the Elevations of Tidal Datums Table Referred
to MLLW only when two or more of the bench marks listed have NAVD 88 elevations.
The NAVD 88 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, NAVD 88 bench mark elevations computed indirectly from the tidal
datums elevation table may differ slightly from NAVD 88 elevations listed for
each bench mark in the NGS database.