U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 6 Station ID: 9447952 PUBLICATION DATE: 07/15/2004 Name: CRESCENT HARBOR, WHIDBEY ISLAND WA NOAA Chart: 18428 Latitude: 48° 17.2' N ( 48.28670) USGS Quad: DECEPTION PASS Longitude: 122° 37.0' W (-122.61700) To reach the tidal bench marks from Mukilteo, proceed by ferry to Whidbey Island, then travel WNW on State Highway 525/20 for about 48 km (30 mi) to Oak Harbor, then proceed ENE on SE Pioneer Way for about 2.2 km (1.4 mi) to Coral Sea Drive, then turn right and proceed SSE on Coral Sea Drive for 0.5 km (0.3 mi) to Tulag Avenue, then turn left and proceed east on Tulag Avenue to the end of the road and the U.S. Navy Fuel and Recreation Pier, on the west side of Crescent Harbor. The bench marks are located on the pier and along the approach to the pier. The tide gage and staff were located at the east end of the pier. 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 6 Station ID: 9447952 PUBLICATION DATE: 07/15/2004 Name: CRESCENT HARBOR, WHIDBEY ISLAND WA NOAA Chart: 18428 Latitude: 48° 17.2' N ( 48.28670) USGS Quad: DECEPTION PASS Longitude: 122° 37.0' W (-122.61700) T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: NO 2 1951 DESIGNATION: TIDAL 2 MONUMENTATION: Bench Mark disk VM#: 9239 AGENCY: US Coast & Geodetic Survey (USC&GS) IDB PID#: TR0440 SETTING CLASSIFICATION: Concrete bollard OPUS PID: LATITUDE: 48° 17.1' N ( 48.28500) LONGITUDE: 122° 37.2' W (-122.62000) The primary bench mark is a disk set in a concrete filled bollard south of the concrete roadway approach to the pier, 23 m (76 ft) west of the west end of the pier, 9.57 m (31.4 ft) west of the NW corner of a 2 m x 4 m (7 ft x 13 ft) concrete water drain basin, 8.08 m (26.5 ft) south of the centerline of the road, 8 m (25 ft) north of the approximate shoreline, and 1 m (2 ft) above the ground. BENCH MARK STAMPING: NO 3 1951 DESIGNATION: 944 7952 TIDAL 3 MONUMENTATION: Bench Mark disk VM#: 9240 AGENCY: US Coast & Geodetic Survey (USC&GS) IDB PID#: TR0438 SETTING CLASSIFICATION: Concrete base OPUS PID: LATITUDE: 48° 17.1' N ( 48.28500) LONGITUDE: 122° 37.4' W (-122.62300) The bench mark is a disk set in the SE corner of the concrete base for fuel oil station No. 306, 37 m (122 ft) south of the centerline of Tulagi Avenue, 34 m (110 ft) west of the rock filled approach to the pier, and 5 m (17 ft) north of the NE corner of a 2 m (5 ft) square concrete manhole with steel plate cover.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 6 Station ID: 9447952 PUBLICATION DATE: 07/15/2004 Name: CRESCENT HARBOR, WHIDBEY ISLAND WA NOAA Chart: 18428 Latitude: 48° 17.2' N ( 48.28670) USGS Quad: DECEPTION PASS Longitude: 122° 37.0' W (-122.61700) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 7952 A 1977 DESIGNATION: 944 7952 A TIDAL MONUMENTATION: Tidal Station disk VM#: 9241 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete pier OPUS PID: LATITUDE: 48° 17.1' N ( 48.28500) LONGITUDE: 122° 37.0' W (-122.61700) The bench mark is a disk set in the concrete deck at the seaward end of the pier, about 9 m (30 ft) west of the SE corner of the seaward end of the pier, 0.3 m (1 ft) north of the timber curb along the south side of the pier, and level with the pier. BENCH MARK STAMPING: 7952 B 1977 DESIGNATION: 944 7952 B TIDAL MONUMENTATION: Tidal Station disk VM#: 9242 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete bollard base OPUS PID: LATITUDE: 48° 17.1' N ( 48.28500) LONGITUDE: 122° 37.0' W (-122.61700) The bench mark is a disk set flush in the SE corner of a concrete base for a bollard on the south side of the pier, 48 m (156 ft) west of bench mark 7952 A 1977, and 0.3 m (1 ft) north of the timber curb along the south side of the pier.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 6 Station ID: 9447952 PUBLICATION DATE: 07/15/2004 Name: CRESCENT HARBOR, WHIDBEY ISLAND WA NOAA Chart: 18428 Latitude: 48° 17.2' N ( 48.28670) USGS Quad: DECEPTION PASS Longitude: 122° 37.0' W (-122.61700) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 7952 C 1977 DESIGNATION: 944 7952 C TIDAL MONUMENTATION: Tidal Station disk VM#: 9243 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete bollard base OPUS PID: LATITUDE: 48° 17.1' N ( 48.28500) LONGITUDE: 122° 37.0' W (-122.61700) The bench mark is a disk set flush in the SE corner of a concrete base for a bollard on the south side of the pier, 51 m (167 ft) west of bench mark 7952 B 1977, and 0.3 m (1 ft) north of the timber curb along the south side of the pier.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 6 Station ID: 9447952 PUBLICATION DATE: 07/15/2004 Name: CRESCENT HARBOR, WHIDBEY ISLAND WA NOAA Chart: 18428 Latitude: 48° 17.2' N ( 48.28670) USGS Quad: DECEPTION PASS Longitude: 122° 37.0' W (-122.61700) T I D A L D A T U M S Tidal datums at CRESCENT HARBOR, WHIDBEY ISLAND based on: LENGTH OF SERIES: 1 MONTH TIME PERIOD: March 1977 - March 1977 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 9447130 SEATTLE, PUGET SOUND Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 3.554 MEAN HIGH WATER MHW = 3.281 MEAN SEA LEVEL MSL = 2.072 MEAN TIDE LEVEL MTL = 2.068 MEAN LOW WATER MLW = 0.855 North American Vertical Datum NAVD88 = 0.675 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW NO 2 1951 5.707 2.426 NO 3 1951 5.546 2.265 7952 A 1977 5.095 1.814 7952 B 1977 5.148 1.867 7952 C 1977 5.098 1.817
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 6 Station ID: 9447952 PUBLICATION DATE: 07/15/2004 Name: CRESCENT HARBOR, WHIDBEY ISLAND WA NOAA Chart: 18428 Latitude: 48° 17.2' N ( 48.28670) USGS Quad: DECEPTION PASS Longitude: 122° 37.0' W (-122.61700) 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.