U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 7 PUBLICATION DATE: 10/12/2001 Station ID: 1890000 SUPERCEDED DATE: 04/21/2003 Name: WAKE ISLAND, PACIFIC OCEAN NOAA Chart: 81664 Latitude: 19° 17.4' N USGS Quad: NONE Longitude: 166° 37.1' E To reach the tidal bench marks from the National Weather Service (NWS) office at the U.S. Army Base, exit the NWS parking lot, turn right onto Wake Highway, and proceed around the runway until the small boat channel is reached. The tide house is located at Building # 1711, a light green concrete block building located near the northern-most corner of the south seawall along the boat channel. The tidal bench marks are located in the vicinity. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: NO 12 1961 DESIGNATION: 189 0000 TIDAL 12 MONUMENTATION: Tidal Station disk VM#: 129 AGENCY: US Coast & Geodetic Survey (USC&GS) PID#: TW0169 SETTING CLASSIFICATION: Concrete apron The primary bench mark is a disk set in the concrete apron at the easterly corner of the Boathouse (Building # 1705), 3.66 m (12.0 ft) SW of the boat basin wharf face, and 0.30 m (1.0 ft) NW of the east edge of concrete apron, and 0.30 m (1.0 ft) SE of easterly corner of building. BENCH MARK STAMPING: NO 13 1965 DESIGNATION: 189 0000 TIDAL 13 MONUMENTATION: Tidal Station disk VM#: 130 AGENCY: US Coast & Geodetic Survey (USC&GS) PID: SETTING CLASSIFICATION: Concrete apron The bench mark is a disk set in the concrete apron at the westerly corner of the Boathouse (Building # 1705), about 14 m (45 ft) SW of the wharf face, 2.99 m (9.8 ft) NW of the center of the NW-most set of double doors on the west side of Boathouse, and 0.2 m (0.5 ft) SW of the westerly corner of the Boathouse.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 7 PUBLICATION DATE: 10/12/2001 Station ID: 1890000 SUPERCEDED DATE: 04/21/2003 Name: WAKE ISLAND, PACIFIC OCEAN NOAA Chart: 81664 Latitude: 19° 17.4' N USGS Quad: NONE Longitude: 166° 37.1' E T I D A L B E N C H M A R K S BENCH MARK STAMPING: TIDAL BM 0000 H 1978 DESIGNATION: 189 0000 TIDAL BM H MONUMENTATION: Tidal Station disk VM#: 134 AGENCY: National Ocean Survey (NOS) PID: SETTING CLASSIFICATION: Concrete foundation The bench mark is a disk set in a concrete bollard stay located along the south seawall of the small boat basin, 75 m (246 ft) NW of bench mark NO 12 1961, 70 m (230 ft) SE of the NW corner of the seawall, 1.1 m (3.5 ft) SW of the seawall, and 0.24 m (0.8 ft) NW of a large double bollard. BENCH MARK STAMPING: TIDAL BM 0000 J 1978 DESIGNATION: 189 0000 TIDAL BM J MONUMENTATION: Tidal Station disk VM#: 135 AGENCY: National Ocean Survey (NOS) PID: SETTING CLASSIFICATION: Concrete slab The bench mark is a disk set in an octagonal concrete pad about 90 m (295 ft) ESE of bench mark 0000 L 1980, 20 m (66 feet) east of the road centerline, 14.08 m (46.2 ft) north of the north corner of the concrete foundation supporting two green transformer boxes, 2.32 m (7.6 ft) north of an orange witness post, 0.3 m (1 ft) SE of the NW corner of the octagon, and 0.46 m (1.5 ft) above grade.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 7 PUBLICATION DATE: 10/12/2001 Station ID: 1890000 SUPERCEDED DATE: 04/21/2003 Name: WAKE ISLAND, PACIFIC OCEAN NOAA Chart: 81664 Latitude: 19° 17.4' N USGS Quad: NONE Longitude: 166° 37.1' E T I D A L B E N C H M A R K S BENCH MARK STAMPING: TIDAL BM 0000 K 1978 DESIGNATION: 189 0000 TIDAL BM K MONUMENTATION: Tidal Station disk VM#: 136 AGENCY: National Ocean Survey (NOS) PID: SETTING CLASSIFICATION: Concrete seawall The bench mark is a disk set in the south concrete seawall bordering the boat basin entrance channel, 16 m (54 ft) WSW of the most NE channel seawall corner, 8 m (27 ft) NE of the SW edge of the concrete seawall, and 0.3 m (1 ft) south of the north edge of the seawall. BENCH MARK STAMPING: 0000 L 1980 DESIGNATION: 189 0000 L MONUMENTATION: Tidal Station disk VM#: 137 AGENCY: National Ocean Survey (NOS) PID: SETTING CLASSIFICATION: Concrete slab The bench mark is a disk set in a 12 m x 32 m (41 ft x 105 ft) abandoned concrete pad overgrown with vines, about 90 m (295 ft) WNW of bench mark TIDAL BM 0000 J 1978, 31.24 m (102.5 ft) NE of the centerline of the main road to the boathouse, 29.41 m (96.5 ft) north of the north corner of an orange underground cable station cover, 10.18 m (33.4 ft) south of the centerline of a dirt road adjacent to the pad, 6.83 m (22.4 ft) east of the north-most of two tall grey 3-inch diameter PVC posts, 0.61 m (2.0 ft) south of the NW edge of the pad, and 0.46 m (1.5 ft) east of the west edge of the pad.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 7 PUBLICATION DATE: 10/12/2001 Station ID: 1890000 SUPERCEDED DATE: 04/21/2003 Name: WAKE ISLAND, PACIFIC OCEAN NOAA Chart: 81664 Latitude: 19° 17.4' N USGS Quad: NONE Longitude: 166° 37.1' E T I D A L B E N C H M A R K S BENCH MARK STAMPING: 0000 N 1989 DESIGNATION: 189 0000 N MONUMENTATION: Tidal Station disk VM#: 139 AGENCY: National Ocean Survey (NOS) PID: SETTING CLASSIFICATION: Concrete foundation The bench mark is a disk set in the foundation of Building # 1706 in the north doorway, located south of the boat basin, 4.75 m (15.6 ft) east of the west side of doorway, 0.13 m (0.45 ft) west of the east side of the doorway, and 0.09 m (0.30 ft) south of north edge of the foundation. BENCH MARK STAMPING: 0000 P 1992 DESIGNATION: 189 0000 P MONUMENTATION: Tidal Station disk VM#: 6425 AGENCY: National Ocean Service (NOS) PID: SETTING CLASSIFICATION: Concrete seawall The bench mark is a disk set in the east end of a concrete seawall, about 100 m (328 ft) south of Building #1715, 64 m (210 ft) south of middle of road leading to east jetty, 34 m (110 ft) north of the high water line, 3.35 m (11.0 ft) north of the east elbow of seawall, and 0.76 m (2.5 ft) above grade.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 7 PUBLICATION DATE: 10/12/2001 Station ID: 1890000 SUPERCEDED DATE: 04/21/2003 Name: WAKE ISLAND, PACIFIC OCEAN NOAA Chart: 81664 Latitude: 19° 17.4' N USGS Quad: NONE Longitude: 166° 37.1' E T I D A L B E N C H M A R K S BENCH MARK STAMPING: 0000 R 1994 DESIGNATION: 189 0000 R MONUMENTATION: Tidal Station disk VM#: 6446 AGENCY: National Ocean Service (NOS) PID: SETTING CLASSIFICATION: Concrete foundation The bench mark is a disk set flush in top a 4 m x 2 m (14 ft x 6 ft) concrete foundation about 82 m (270 ft) south of Building # 1716, 43 m (142 ft) SE of the SW corner of a WWII concrete pillbox, 29 m (96 ft) SW of a large circular concrete fuel tank foundaiton which no longer has a tank on it, 23 m (75 ft) NE of the center of paved road leading to east jetty, 0.76 m (2.5 ft) SW of the NE side of the foundation, 0.76 m (2.5 ft) SE of the NE side of the foundation, and 0.3 m (1 ft) above grade.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 7 PUBLICATION DATE: 10/12/2001 Station ID: 1890000 SUPERCEDED DATE: 04/21/2003 Name: WAKE ISLAND, PACIFIC OCEAN NOAA Chart: 81664 Latitude: 19° 17.4' N USGS Quad: NONE Longitude: 166° 37.1' E T I D A L D A T U M S Tidal datums at WAKE ISLAND, PACIFIC OCEAN based on: LENGTH OF SERIES: 17 YEARS TIME PERIOD: January 1960 - December 1977 TIDAL EPOCH: 1960-1978 CONTROL TIDE STATION: Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: HIGHEST OBSERVED WATER LEVEL (10/28/1992) = 1.759 MEAN HIGHER HIGH WATER MHHW = 0.732 MEAN HIGH WATER MHW = 0.668 MEAN SEA LEVEL MSL = 0.357 MEAN TIDE LEVEL MTL = 0.354 MEAN LOW WATER MLW = 0.037 MEAN LOWER LOW WATER MLLW = 0.000 LOWEST OBSERVED WATER LEVEL (04/14/1968) = -0.591 Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW NO 12 1961 3.152 2.485 NO 13 1965 3.241 2.573 TIDAL BM 0000 H 1978 3.000 2.333 TIDAL BM 0000 J 1978 4.765 4.097 TIDAL BM 0000 K 1978 3.485 2.818 0000 L 1980 4.151 3.483 0000 N 1989 3.942 3.274 0000 P 1992 4.029 3.362 0000 R 1994 3.491 2.824
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 7 PUBLICATION DATE: 10/12/2001 Station ID: 1890000 SUPERCEDED DATE: 04/21/2003 Name: WAKE ISLAND, PACIFIC OCEAN NOAA Chart: 81664 Latitude: 19° 17.4' N USGS Quad: NONE Longitude: 166° 37.1' E 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 any other fixed island datum. This tide station location has a local island datum. Island datums are specific fixed geodetic datums whose elevation relationship 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.