U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 4 PUBLICATION DATE: 07/27/1987 Station ID: 9437262 SUPERCEDED DATE: 04/21/2003 Name: NETARTS, NETARTS BAY OREGON NOAA Chart: 18520 Latitude: 45° 25.8' N USGS Quad: TILLAMOOK Longitude: 123° 56.7' W To reach the tidal bench marks from Netarts, proceed west on State Route 131 (Netarts/Oceanside Road) to the road leading to Tillamook County Park, go south on the road to Bay Front Drive and the Tillamook County Boat Landing. The bench marks are located along Bay Front Drive and Route 131. The tide gage and staff were located on the Tillamook County boat dock. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 943 7262 A 1977 MONUMENTATION: Survey Disk VM#: 8854 AGENCY: PID: SETTING CLASSIFICATION: Unspecified Rod The bench mark is 358 feet (109 m) WNW of Bench Mark NO STAMPING 1, 77 feet (23 m) NE of utility pole #BX81-L3-SP1, 20 feet (6 m) NE of the centerline of Bay Front Drive, and 0.5 foot (0.2 m) south of a witness post. The bench mark is crimped to an unspecified rod driven 18 feet (5 m) to refusal, and encased in a 4-inch PVC pipe and concrete kickblock. BENCH MARK STAMPING: 943 7262 B 1977 MONUMENTATION: Survey Disk VM#: 8855 AGENCY: PID: SETTING CLASSIFICATION: Unspecified Rod The bench mark is 50.5 feet (15.4 m) south of the centerline of Route 131, 45.5 feet (13.9 m) NW of utility pole #BX81, 21 feet (6 m) west of the centerline of the road leading to Tillamook County Park, 13.0 feet (4.0 m) west of the schooner (Captains Room) sign, and 0.5 foot (0.2 m) south of a witness post. The bench mark is crimped to an unspecified rod driven 44 feet (13 m) to refusal, and encased in a 4-inch PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 4 PUBLICATION DATE: 07/27/1987 Station ID: 9437262 SUPERCEDED DATE: 04/21/2003 Name: NETARTS, NETARTS BAY OREGON NOAA Chart: 18520 Latitude: 45° 25.8' N USGS Quad: TILLAMOOK Longitude: 123° 56.7' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: 943 7262 C 1977 MONUMENTATION: Survey Disk VM#: 8856 AGENCY: PID: SETTING CLASSIFICATION: Unspecified Rod The bench mark is 38 feet (12 m) north of the centerline of Route 131, 33.0 feet (10.1 m) west of an unnumbered utility pole, 14.5 feet (4.4 m) west of the centerline of Silven Sand Road, and 0.5 foot (0.2 m) south of a witness post. The bench mark is crimped to an unspecified rod driven 18 feet (5 m) to refusal, and encased in a 4-inch PVC pipe and concrete kickblock. BENCH MARK STAMPING: NO STAMPING 1 MONUMENTATION: Survey Disk VM#: 8857 AGENCY: PID: SETTING CLASSIFICATION: Concrete Curb The bench mark is set flush in the eastern concrete curb at the Tillamook Boat Landing launching ramp, 20.5 feet (6.2 m) west of the NW corner of the restroom building, and 9 feet (3 m) south of the north end of the curb. BENCH MARK STAMPING: NO STAMPING 2 MONUMENTATION: Survey Disk VM#: 8858 AGENCY: PID: SETTING CLASSIFICATION: Bronze Steel Rod The bench mark is 3 feet (1 m) SW of the center of a pole supporting the Tillamook Boat Landing sign, and 1.5 feet (0.5 m) SW of the SW edge of the concrete sign base. The bench mark is a yellow plastic mark crimped to a bronze water steel rod driven 3 feet (1 m) into the ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 4 PUBLICATION DATE: 07/27/1987 Station ID: 9437262 SUPERCEDED DATE: 04/21/2003 Name: NETARTS, NETARTS BAY OREGON NOAA Chart: 18520 Latitude: 45° 25.8' N USGS Quad: TILLAMOOK Longitude: 123° 56.7' W T I D A L D A T U M S Tidal datums at NETARTS, NETARTS BAY based on: LENGTH OF SERIES: 3 MONTHS TIME PERIOD: SEPTEMBER-NOVEMBER 1979 TIDAL EPOCH: 1960-1978 CONTROL TIDE STATION: 9440910 TOKE POINT, WA Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET: HIGHEST OBSERVED WATER LEVEL (12/22/1977) = 11.54 MEAN HIGHER HIGH WATER MHHW = 6.76 MEAN HIGH WATER MHW = 6.01 MEAN TIDE LEVEL MTL = 3.51 MEAN LOW WATER MLW = 1.01 MEAN LOWER LOW WATER MLLW = 0.00 LOWEST OBSERVED WATER LEVEL (07/31/1977) = -1.78 Bench Mark Elevation Information In FEET above: Stamping or Designation MLLW MHW 943 7262 A 1977 15.99 9.98 943 7262 B 1977 40.75 34.74 943 7262 C 1977 43.50 37.49 NO STAMPING 1 10.83 4.82 NO STAMPING 2 15.83 9.82
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 4 PUBLICATION DATE: 07/27/1987 Station ID: 9437262 SUPERCEDED DATE: 04/21/2003 Name: NETARTS, NETARTS BAY OREGON NOAA Chart: 18520 Latitude: 45° 25.8' N USGS Quad: TILLAMOOK Longitude: 123° 56.7' W 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 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.