U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 8 Station ID: 8652678 PUBLICATION DATE: 07/26/2011 Name: USCG LIFEBOAT STATION, OREGON INLET NC NOAA Chart: 12204 Latitude: 35° 46.1' N ( 35.76830) USGS Quad: OREGON INLET Longitude: 75° 31.6' W ( -75.52670) To reach the tidal bench marks at the old Coast Guard Station at Oregon Inlet, NC, from the State Route 12 bridge over Oregon Inlet, proceed to the SE end of the bridge and a parking area on the east side of the highway, then continue on foot along the shoreline to the abandoned Coast Guard Lifeboat Station. The bench marks are located on the grounds of the station. The tide gage and staff were located on a small abandoned pier formerly used by the Coast Guard. 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 8 Station ID: 8652678 PUBLICATION DATE: 07/26/2011 Name: USCG LIFEBOAT STATION, OREGON INLET NC NOAA Chart: 12204 Latitude: 35° 46.1' N ( 35.76830) USGS Quad: OREGON INLET Longitude: 75° 31.6' W ( -75.52670) T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: NO 2 1974 DESIGNATION: TIDAL 2 MONUMENTATION: Tidal Station disk VM#: 12576 AGENCY: National Ocean Survey (NOS) IDB PID#: EX0158 SETTING CLASSIFICATION: Concrete step OPUS PID: LATITUDE: 35° 46.1' N ( 35.76830) LONGITUDE: 75° 31.4' W ( -75.52330) The primary bench mark is a disk set flush in the SE corner of the concrete step of the generator building, 22.25 m ( 73.0 ft) SW of the NW corner of the station house, and 1.31 m (4.3 ft) east of the SE corner of the generator building.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 8 Station ID: 8652678 PUBLICATION DATE: 07/26/2011 Name: USCG LIFEBOAT STATION, OREGON INLET NC NOAA Chart: 12204 Latitude: 35° 46.1' N ( 35.76830) USGS Quad: OREGON INLET Longitude: 75° 31.6' W ( -75.52670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: NO 1 1974 DESIGNATION: TIDAL 1 MONUMENTATION: Tidal Station disk VM#: 270 AGENCY: National Ocean Survey (NOS) IDB PID#: EX0154 SETTING CLASSIFICATION: Concrete ramp OPUS PID: LATITUDE: 35° 46.1' N ( 35.76830) LONGITUDE: 75° 31.4' W ( -75.52330) The bench mark is a disk set flush in a concrete garage ramp, 21.64 m (71.0 ft) south of where the pier and bulkhead join, and 3.96 m (13.0 ft) west of the NE corner of the garage.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 8 Station ID: 8652678 PUBLICATION DATE: 07/26/2011 Name: USCG LIFEBOAT STATION, OREGON INLET NC NOAA Chart: 12204 Latitude: 35° 46.1' N ( 35.76830) USGS Quad: OREGON INLET Longitude: 75° 31.6' W ( -75.52670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: NO 3 1962 DESIGNATION: TIDAL 3 MONUMENTATION: Tidal Station disk VM#: 12661 AGENCY: National Ocean Survey (NOS) IDB PID#: EX0159 SETTING CLASSIFICATION: Concrete porch OPUS PID: LATITUDE: 35° 46.1' N ( 35.76830) LONGITUDE: 75° 31.4' W ( -75.52330) The bench mark is a disk set in the NNW corner of the concrete porch at the back of the Coast Guard Station House, 6.83 m (22.4 ft) north of the south corner of the porch, and 1.55 m (5.1 ft) west of the steps to the back entrance.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 8 Station ID: 8652678 PUBLICATION DATE: 07/26/2011 Name: USCG LIFEBOAT STATION, OREGON INLET NC NOAA Chart: 12204 Latitude: 35° 46.1' N ( 35.76830) USGS Quad: OREGON INLET Longitude: 75° 31.6' W ( -75.52670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: NO 4 1974 DESIGNATION: TIDAL 4 MONUMENTATION: Tidal Station disk VM#: 12662 AGENCY: National Ocean Survey (NOS) IDB PID#: EX0157 SETTING CLASSIFICATION: Concrete deck OPUS PID: LATITUDE: 35° 46.1' N ( 35.76830) LONGITUDE: 75° 31.4' W ( -75.52330) The bench mark is a disk set flush in a concrete deck, 25.30 m (83.0 ft) north of the generator building, 14.60 m (47.9 ft) west of the NW corner of the station house, 12.19 m (40.0 ft) east of the NW corner of a chain link fence, and 0.09 m (0.3 ft) south of the north edge of the concrete deck.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 8 Station ID: 8652678 PUBLICATION DATE: 07/26/2011 Name: USCG LIFEBOAT STATION, OREGON INLET NC NOAA Chart: 12204 Latitude: 35° 46.1' N ( 35.76830) USGS Quad: OREGON INLET Longitude: 75° 31.6' W ( -75.52670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: DESIGNATION: 865 2678 STEP ALIAS: NO STAMPING 1 MONUMENTATION: Chiseled Square VM#: 12663 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete step OPUS PID: LATITUDE: 35° 46.1' N ( 35.76830) LONGITUDE: 75° 31.6' W ( -75.52670) The bench mark is a chiseled square in the lowest of three steps that lead to the old Coast Guard Pier, 24.48 m (80.3 ft) north of the NE corner of the garage building, 13.11 m (43.0 ft) SSW of the SW side of the boat ramp, 9.45 m (31.0 ft) SE of the SE end of the pier, and 0.15 m (0.5 ft) above ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 8 Station ID: 8652678 PUBLICATION DATE: 07/26/2011 Name: USCG LIFEBOAT STATION, OREGON INLET NC NOAA Chart: 12204 Latitude: 35° 46.1' N ( 35.76830) USGS Quad: OREGON INLET Longitude: 75° 31.6' W ( -75.52670) T I D A L D A T U M S Tidal datums at USCG LIFEBOAT STATION, OREGON INLET based on: LENGTH OF SERIES: 2 MONTHS TIME PERIOD: May 1994 - June 1994 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8652587 OREGON INLET MARINA, PAMLICO SOUND Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 0.666 MEAN HIGH WATER MHW = 0.603 North American Vertical Datum NAVD88 = 0.435 MEAN TIDE LEVEL MTL = 0.316 MEAN SEA LEVEL MSL = 0.311 MEAN LOW WATER MLW = 0.029 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 1974 2.083 1.480 NO 1 1974 1.731 1.128 NO 3 1962 2.248 1.645 NO 4 1974 1.752 1.149 865 2678 STEP 1.266 0.663
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 8 of 8 Station ID: 8652678 PUBLICATION DATE: 07/26/2011 Name: USCG LIFEBOAT STATION, OREGON INLET NC NOAA Chart: 12204 Latitude: 35° 46.1' N ( 35.76830) USGS Quad: OREGON INLET Longitude: 75° 31.6' W ( -75.52670) 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.