U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 9 Station ID: 9447973 PUBLICATION DATE: 11/15/2016 Name: NAS WHIDBEY ISLAND, STRAIT OF JAUN DE FUCA WA NOAA Chart: 18429 Latitude: 48° 20.6' N ( 48.34283) USGS Quad: OAK HARBOR Longitude: 122° 41.1' W (-122.68583) To reach the tide station from the entrance gate for Naval Air Station Whidbey Island on Langley Boulevard, proceed north on Langley Boulevard for 0.7 km (0.4 mi) to the intersection with Midway Street, turn left and proceed west on Midway Street for 0.8 km (0.5 mi) to the T intersection with North Saratoga Street, turn right and proceed north on North Saratoga Street for 0.6 km (0.4 mi) to the parking lot for the Nor Wester building on the left, proceed on foot 0.1 km (0.1 mi) west across the lawn from the parking lot and then down the grassy hill to the beach below, turn left and proceed SW along the beach 0.2 km (0.1 mi) to the tide station. The bench marks are above the beach on the bluff and along Midway Street. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 7973 A 2016 DESIGNATION: 944 7973 A MONUMENTATION: Flange-encased Rod VM#: 21932 AGENCY: National Ocean Service IDB PID#: SETTING CLASSIFICATION: OPUS PID#: BBFF69 LATITUDE: 48° 20.6' N ( 48.34389) LONGITUDE: 122° 40.9' W (-122.68178) The primary bench mark is a flange encased rod set in the grass at the top of the bluff above the beach, 64.54 m (211.7 ft) W of the SW post of a covered bridge for a walking path, 55.40 m (181.8 ft) ESE of a 21 cm (8 inches) diameter monitoring well near the beach, 41.52 m (136.2 ft) NNW of the W set of double doors on the N side of the nor wester building, 7.62 m (25.0 ft) WNW of the SW corner of a concrete pad for a viewing scope, and 0.42 m (1.4 ft) ESE of a carsonite witness post. The datum point is set 3 cm (1 inch) below ground, being the top of a stainless steel rod driven 6.7 m (22.0 ft) to refusal, in a sleeve extending to a depth of 0.91 m (3.0 ft) and encased in a 5-inch (13 cm) nos logo cap with concrete kick block.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 9 Station ID: 9447973 PUBLICATION DATE: 11/15/2016 Name: NAS WHIDBEY ISLAND, STRAIT OF JAUN DE FUCA WA NOAA Chart: 18429 Latitude: 48° 20.6' N ( 48.34283) USGS Quad: OAK HARBOR Longitude: 122° 41.1' W (-122.68583) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 7973 B 2016 DESIGNATION: 944 7973 B MONUMENTATION: Tidal Station disk VM#: 21933 AGENCY: National Ocean Service IDB PID#: SETTING CLASSIFICATION: Concrete loading dock OPUS PID: LATITUDE: 48° 20.6' N ( 48.34303) LONGITUDE: 122° 40.9' W (-122.68147) The bench mark is a disk set in the concrete loading dock of the Nor Wester building, 28.06 m (92.1 ft) WNW of a street light pole, 12.97 m (42.6 ft) W of the center of a storm drain, 9.64 m (31.6 ft) NNW of the S end of the wall, 5.71 m (18.7 ft) NNW of the edge of loading dock, and 1.29 m (4.2 ft) SW of the S side of a door.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 9 Station ID: 9447973 PUBLICATION DATE: 11/15/2016 Name: NAS WHIDBEY ISLAND, STRAIT OF JAUN DE FUCA WA NOAA Chart: 18429 Latitude: 48° 20.6' N ( 48.34283) USGS Quad: OAK HARBOR Longitude: 122° 41.1' W (-122.68583) T I D A L B E N C H M A R K S BENCH MARK STAMPING: CHAPEL NO 2 WWB 1972 DESIGNATION: CHAPEL 2 1974 MONUMENTATION: Not specified (see descriptive text) VM#: 21934 AGENCY: IDB PID#: TR1395 SETTING CLASSIFICATION: OPUS PID: LATITUDE: 48° 20.3' N ( 48.33875) LONGITUDE: 122° 40.5' W (-122.67483) The bench mark is a flat disk set in a concrete monument, 15.66 m (51.4 ft) NE of a street light pole, 6.01 m (19.7 ft) NW of S most wood sign post, 4.79 m (15.7 ft) WSW of a street light pole, 3.30 m (10.8 ft) N of the NW corner of a concrete utility pad, 3.15 m (10.3 ft) E of a paved fitness trail, and 0.1 m (0.3 ft) below the ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 9 Station ID: 9447973 PUBLICATION DATE: 11/15/2016 Name: NAS WHIDBEY ISLAND, STRAIT OF JAUN DE FUCA WA NOAA Chart: 18429 Latitude: 48° 20.6' N ( 48.34283) USGS Quad: OAK HARBOR Longitude: 122° 41.1' W (-122.68583) T I D A L B E N C H M A R K S BENCH MARK STAMPING: NO 2 1951 DESIGNATION: LOG HOUSE RM 2 MONUMENTATION: Reference Mark disk VM#: 21935 AGENCY: US Coast and Geodetic Survey IDB PID#: TR0403 SETTING CLASSIFICATION: OPUS PID: LATITUDE: 48° 20.5' N ( 48.34150) LONGITUDE: 122° 41.2' W (-122.68597) The bench mark is a disk in a concrete monument set among thorn bushes, 17.14 m (56.2 ft) W of a 0.45 m (1.5 ft) diameter evergreen tree, 16.05 m (52.7 ft) N of a wood fence, 12.39 m (40.6 ft) NW of the SE corner of a concrete pad.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 9 Station ID: 9447973 PUBLICATION DATE: 11/15/2016 Name: NAS WHIDBEY ISLAND, STRAIT OF JAUN DE FUCA WA NOAA Chart: 18429 Latitude: 48° 20.6' N ( 48.34283) USGS Quad: OAK HARBOR Longitude: 122° 41.1' W (-122.68583) T I D A L B E N C H M A R K S BENCH MARK STAMPING: LOG HOUSE 2 1969 DESIGNATION: LOG HOUSE 2 MONUMENTATION: Triangulation Station disk VM#: 21936 AGENCY: US Coast and Geodetic Survey IDB PID#: TR0404 SETTING CLASSIFICATION: Concrete slab OPUS PID: LATITUDE: 48° 20.5' N ( 48.34147) LONGITUDE: 122° 41.2' W (-122.68592) The bench mark is a disk set in a concrete pad 11.32 m (37.1 ft) N of a wood fence, 11.32 m (37.1 ft) SW of a 0.45 m (1.5 ft) diameter evergreen tree, and 5.33 m (17.5 ft) W of the SE corner of concrete pad.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 9 Station ID: 9447973 PUBLICATION DATE: 11/15/2016 Name: NAS WHIDBEY ISLAND, STRAIT OF JAUN DE FUCA WA NOAA Chart: 18429 Latitude: 48° 20.6' N ( 48.34283) USGS Quad: OAK HARBOR Longitude: 122° 41.1' W (-122.68583) T I D A L B E N C H M A R K S BENCH MARK STAMPING: LOG HOUSE 2 NO 3 1969 DESIGNATION: LOG HOUSE 2 RM 3 MONUMENTATION: Reference Mark disk VM#: 21937 AGENCY: US Coast and Geodetic Survey IDB PID#: TR0405 SETTING CLASSIFICATION: OPUS PID: LATITUDE: 48° 20.5' N ( 48.34142) LONGITUDE: 122° 41.2' W (-122.68600) The bench mark is a disk set in a concrete monument in grass, 16.69 m (54.8 ft) WSW of a 0.45 m (1.5 ft) diameter evergreen tree, 7.16 m (23.5 ft) WSW of the SE corner of concrete pad, and 5.19 m (17.0 ft) N of a wood fence.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 9 Station ID: 9447973 PUBLICATION DATE: 11/15/2016 Name: NAS WHIDBEY ISLAND, STRAIT OF JAUN DE FUCA WA NOAA Chart: 18429 Latitude: 48° 20.6' N ( 48.34283) USGS Quad: OAK HARBOR Longitude: 122° 41.1' W (-122.68583) T I D A L B E N C H M A R K S BENCH MARK STAMPING: Z 343 1952 DESIGNATION: Z 343 MONUMENTATION: Bench Mark disk VM#: 21938 AGENCY: US Coast and Geodetic Survey IDB PID#: TR0411 SETTING CLASSIFICATION: Utility access cover pad OPUS PID: LATITUDE: 48° 20.3' N ( 48.33758) LONGITUDE: 122° 40.1' W (-122.66764) The bench mark is a disk set in a concrete slab for a sewer manhole, 47.98 m (157.4 ft) ESE of the SE corner of the region legal service office building, 31.95 m (104.8 ft) N of the centerline of an unnamed road, 28.52 m (93.6 ft) SSE of a 21 cm (8 inches) diameter monitoring well number 311, 24.67 m (80.9 ft) W of a 21 cm (8 inches) diameter monitoring well number ff3 350, and 0.76 m (2.5 ft) E of the center of a 0.54 m (1.8 ft) diameter sanitary sewer manhole.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 8 of 9 Station ID: 9447973 PUBLICATION DATE: 11/15/2016 Name: NAS WHIDBEY ISLAND, STRAIT OF JAUN DE FUCA WA NOAA Chart: 18429 Latitude: 48° 20.6' N ( 48.34283) USGS Quad: OAK HARBOR Longitude: 122° 41.1' W (-122.68583) T I D A L D A T U M S Tidal datums at NAS WHIDBEY ISLAND, STRAIT OF JAUN DE FUCA based on: LENGTH OF SERIES: 3 MONTHS TIME PERIOD: June 2016 - August 2016 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 9449880 FRIDAY HARBOR, SAN JUAN CHANNEL Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 2.267 MEAN HIGH WATER MHW = 2.077 MEAN TIDE LEVEL MTL = 1.372 MEAN SEA LEVEL MSL = 1.353 MEAN LOW WATER MLW = 0.667 North American Vertical Datum NAVD88 = 0.100 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 7973 A 2016 9.552 7.475 7973 B 2016 11.516 9.439 CHAPEL NO 2 WWB 1972 20.064 17.987 NO 2 1951 23.321 21.244 LOG HOUSE 2 1969 22.482 20.405 LOG HOUSE 2 NO 3 1969 22.395 20.318 Z 343 1952 11.276 9.199
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 9 of 9 Station ID: 9447973 PUBLICATION DATE: 11/15/2016 Name: NAS WHIDBEY ISLAND, STRAIT OF JAUN DE FUCA WA NOAA Chart: 18429 Latitude: 48° 20.6' N ( 48.34283) USGS Quad: OAK HARBOR Longitude: 122° 41.1' W (-122.68583) 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.