U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 PUBLICATION DATE: 09/29/1988 Station ID: 9447659 SUPERCEDED DATE: 04/21/2003 Name: EVERETT, POSSESSION SOUND WASHINGTON NOAA Chart: 18444 Latitude: 47° 58.8' N USGS Quad: EVERETT Longitude: 122° 13.4' W To reach the tidal bench marks from the intersection of Rucker Avenue and Hewitt Avenue in Everett, proceed west on Hewitt Avenue, cross under the Burlington Northern railroad tracks at the termination of Hewitt Avenue at the waterfront, turn left at Terminal Street and continue 0.15 mile (0.2 km) to the Port of Everett Pier 1 Complex, turn right and proceed through the pier 1 NW gate, and then west to the extreme seaward side of pier 1. The bench marks are on the shore area around the pier. The tide gage and staff were at the center of the pier end. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 5 1934 MONUMENTATION: Survey Disk VM#: 9204 AGENCY: PID: SETTING CLASSIFICATION: Concrete Step The bench mark is set in the lowest step at the NW end of the NE abutment of the railroad bridge over Wall Street, 450 feet (137 m) SW of the SW end of the passenger station, 18.5 feet (5.6 m) NE of the centerline of Wall Street, 17.0 feet (5.2 m) NW of the NW rail, 15.0 feet (4.6 m) below the track, 3.0 feet (0.9 m) SE of the SE end of the concrete retaining wall, and 2.5 feet (0.8 m) above the sidewalk level. BENCH MARK STAMPING: 3 1927 MONUMENTATION: Survey Disk VM#: 9201 AGENCY: PID#: SY0002 SETTING CLASSIFICATION: Concrete Battery Well Base The bench mark is set in concrete on the battery well base of Semaphore No. 326 on the lower track of the Great Northern Railway, 130 feet (40 m) north of the Hewitt Avenue crossing, 450 feet (137 m) north of the railroad station, 13 rails NE of a line along the NE side of the passenger station, 8.0 feet (2.4 m) SW of the west leg of the signal, 8.1 feet (2.5 m) NW of the NW rail of the lower track, and 0.5 foot (0.15 m) above ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 PUBLICATION DATE: 09/29/1988 Station ID: 9447659 SUPERCEDED DATE: 04/21/2003 Name: EVERETT, POSSESSION SOUND WASHINGTON NOAA Chart: 18444 Latitude: 47° 58.8' N USGS Quad: EVERETT Longitude: 122° 13.4' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: 4 1934 MONUMENTATION: Survey Disk VM#: 9202 AGENCY: PID#: SY0004 SETTING CLASSIFICATION: Concrete Abutment The bench mark is set into the concrete on the SE end of the NE concrete abutment of the steel railroad bridge over Hewitt Avenue, 330 feet (100 m) north of the railroad station, 13 rails NE of the NE end of the passenger station, 8.5 feet (2.6 m) SE of the SE rail, 7.0 feet (2.1 m) above the sidewalk, and 4.0 feet (1.2 m) below the level of the overhead tracks. BENCH MARK STAMPING: J 7 ELEV 23.025 FT MONUMENTATION: Survey Disk VM#: 9203 AGENCY: PID#: SY0003 SETTING CLASSIFICATION: Concrete Abutment The bench mark is set into the concrete at the Hewitt Avenue overhead bridge No. 406, 300 feet (91 m) NE of the NE end of the railroad station, in the top of the NW corner of the west stone pier supporting steel column on the south curb line of Hewitt Avenue, 16.0 feet (4.9 m) north of the retaining wall face at the SW end of underpass, and 17.0 feet (5.2 m) south of the centerline of the south lane of Hewitt Avenue.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 PUBLICATION DATE: 09/29/1988 Station ID: 9447659 SUPERCEDED DATE: 04/21/2003 Name: EVERETT, POSSESSION SOUND WASHINGTON NOAA Chart: 18444 Latitude: 47° 58.8' N USGS Quad: EVERETT Longitude: 122° 13.4' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: 7659 H 1976 MONUMENTATION: Survey Disk VM#: 9205 AGENCY: PID: SETTING CLASSIFICATION: Concrete Foundation The bench mark is set in concrete in the NW corner of a 6 x 12 x 1 foot (2 x 4 x 0.3 m) concrete foundation, at the entrance to the Port of Everett Pier 1 complex, 80.0 feet (24.4 m) west of the lower railroad tracks, 62.0 feet (18.9 m) NE of a guard shelter and telephone booth, 28.0 feet (8.5 m) SW of the northern entrance gate, 6.0 feet (1.8 m) south of an east-west chain link fence, and 4.5 feet (1.4 m) NW of a fire hydrant.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 PUBLICATION DATE: 09/29/1988 Station ID: 9447659 SUPERCEDED DATE: 04/21/2003 Name: EVERETT, POSSESSION SOUND WASHINGTON NOAA Chart: 18444 Latitude: 47° 58.8' N USGS Quad: EVERETT Longitude: 122° 13.4' W T I D A L D A T U M S Tidal datums at EVERETT, POSSESSION SOUND based on: LENGTH OF SERIES: 10 MONTHS TIME PERIOD: FEB-JULY AND SEPT.-DEC. 1977 TIDAL EPOCH: 1960-1978 CONTROL TIDE STATION: 9447130 SEATTLE Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET: HIGHEST OBSERVED WATER LEVEL (12/06/1977) = 14.35 MEAN HIGHER HIGH WATER MHHW = 11.11 MEAN HIGH WATER MHW = 10.25 MEAN TIDE LEVEL MTL = 6.52 * NATIONAL GEODETIC VERTICAL DATUM NGVD29 = 5.93 MEAN LOW WATER MLW = 2.80 MEAN LOWER LOW WATER MLLW = 0.00 LOWEST OBSERVED WATER LEVEL (06/02/1977) = -3.60 * NGVD reference based on elevations published in Quad Everett, 1973, and NOS leveling of 1976. North American Vertical Datum (NAVD88) Bench Mark Elevation Information In FEET above: Stamping or Designation MLLW MHW 5 1934 23.37 13.12 3 1927 22.59 12.34 4 1934 42.17 31.92 J 7 ELEV 23.025 FT 29.05 18.80 7659 H 1976 18.27 8.02
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 PUBLICATION DATE: 09/29/1988 Station ID: 9447659 SUPERCEDED DATE: 04/21/2003 Name: EVERETT, POSSESSION SOUND WASHINGTON NOAA Chart: 18444 Latitude: 47° 58.8' N USGS Quad: EVERETT Longitude: 122° 13.4' 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 (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 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.