U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 4 Station ID: 9448614 PUBLICATION DATE: 01/23/2004 Name: RESERVATION BAY WA NOAA Chart: 18427 Latitude: 48° 24.9' N ( 48.41500) USGS Quad: DECEPTION PASS Longitude: 122° 39.1' W (-122.65200) To reach the tidal bench marks from Anacortes, proceed 16 km (10 mi) south to the south coast of Fidalgo Island and Deception Pass State Park. The bench marks are within the park, along the coastline of Bowman (Reservation) Bay from Rosario Head to the park pier. The tide gage and staff were located on the south side of the pier, 122 m (400 ft) west of the east end of the pier. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: BM 8 1973 DESIGNATION: 944 8614 TIDAL 8 MONUMENTATION: Tidal Station disk VM#: 9261 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete foundation OPUS PID: LATITUDE: 48° 24.9' N ( 48.41500) LONGITUDE: 122° 39.1' W (-122.65200) The primary bench mark is a disk set in the NW corner of the concrete foundation of the Deception Pass State Park service shed, 4 m (12 ft) east of the NW corner of the foundation, and 1 m (3 ft) NW of the NW corner of the shed. BENCH MARK STAMPING: BM 6 1973 DESIGNATION: 944 8614 TIDAL 6 MONUMENTATION: Tidal Station disk VM#: 9259 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete foundation OPUS PID: LATITUDE: 48° 24.9' N ( 48.41500) LONGITUDE: 122° 39.1' W (-122.65200) The bench mark is a disk set in the NW corner of the concrete foundation of the second recreation shelter, with a 6 m (20 ft) long cook pit, north of the Deception Pass State Park parking lot.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 4 Station ID: 9448614 PUBLICATION DATE: 01/23/2004 Name: RESERVATION BAY WA NOAA Chart: 18427 Latitude: 48° 24.9' N ( 48.41500) USGS Quad: DECEPTION PASS Longitude: 122° 39.1' W (-122.65200) T I D A L B E N C H M A R K S BENCH MARK STAMPING: BM 7 1973 DESIGNATION: 944 8614 TIDAL 7 MONUMENTATION: Tidal Station disk VM#: 9260 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete foundation OPUS PID: LATITUDE: 48° 24.9' N ( 48.41500) LONGITUDE: 122° 39.1' W (-122.65200) The bench mark is a disk set in the SW corner of the concrete foundation of the first recreation shelter north of the Deception Pass State Park parking lot, 79 m (260 ft) SE of bench mark BM 6 1973, and 2 m (5 ft) NE of the SW support pole of the shelter.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 4 Station ID: 9448614 PUBLICATION DATE: 01/23/2004 Name: RESERVATION BAY WA NOAA Chart: 18427 Latitude: 48° 24.9' N ( 48.41500) USGS Quad: DECEPTION PASS Longitude: 122° 39.1' W (-122.65200) T I D A L D A T U M S Tidal datums at RESERVATION BAY based on: LENGTH OF SERIES: 2 YEARS TIME PERIOD: November 1973 - October 1975 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 9444900 PORT TOWNSEND, ADMIRALTY INLET Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: HIGHEST OBSERVED WATER LEVEL (01/15/1974) = 3.200 MEAN HIGHER HIGH WATER MHHW = 2.352 MEAN HIGH WATER MHW = 2.154 MEAN TIDE LEVEL MTL = 1.450 MEAN SEA LEVEL MSL = 1.410 MEAN LOW WATER MLW = 0.746 MEAN LOWER LOW WATER MLLW = 0.000 LOWEST OBSERVED WATER LEVEL (01/07/1974) = -1.137 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW BM 8 1973 4.018 1.864 BM 6 1973 3.875 1.721 BM 7 1973 2.937 0.783
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 4 Station ID: 9448614 PUBLICATION DATE: 01/23/2004 Name: RESERVATION BAY WA NOAA Chart: 18427 Latitude: 48° 24.9' N ( 48.41500) USGS Quad: DECEPTION PASS Longitude: 122° 39.1' W (-122.65200) 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.