U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 9440571 PUBLICATION DATE: 01/23/2004 Name: ALTOONA, COLUMBIA RIVER WA NOAA Chart: 18523 Latitude: 46° 15.9' N ( 46.26500) USGS Quad: ROSBURG Longitude: 123° 39.2' W (-123.65300) To reach the tidal bench marks from the intersection of State Highway 4 and State Highway 403 at Rosburg, proceed south on State Highway 403 for approximately 11 km (7 mi) to the town of Altoona. The bench marks are located along State Highway 403. The tide gage and staff were located at the old cannery building. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 4 1940 DESIGNATION: 4 MONUMENTATION: Bench Mark disk VM#: 8916 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: SC0534 SETTING CLASSIFICATION: Bedrock OPUS PID: LATITUDE: 46° 16.0' N ( 46.26670) LONGITUDE: 123° 39.4' W (-123.65700) The primary bench mark is a disk set flush in bedrock with remains of a pier foundation located along State Highway 403, 34 m (110 ft) east of the driveway leading into the cannery, 30 m (100 ft) SE of bench mark 0571 A 1981, 25 m (82 ft) SE of a metal garage, and 10.00 m (32.8 ft) south of the centerline of the highway.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 9440571 PUBLICATION DATE: 01/23/2004 Name: ALTOONA, COLUMBIA RIVER WA NOAA Chart: 18523 Latitude: 46° 15.9' N ( 46.26500) USGS Quad: ROSBURG Longitude: 123° 39.2' W (-123.65300) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 0571 A 1981 DESIGNATION: 944 0571 A TIDAL MONUMENTATION: Tidal Station disk VM#: 8917 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete door sill OPUS PID: LATITUDE: 46° 15.9' N ( 46.26500) LONGITUDE: 123° 39.2' W (-123.65300) The bench mark is a disk set flush in concrete door sill located on the south side of a large metal garage, 31 m (101 ft) NNW of bench mark 4 1940, 12.34 m (40.5 ft) north of the centerline of State Highway 403, 9.30 m (30.5 ft) east of the SW corner of the garage, and 0.15 m (0.5 ft) south of the garage wall. BENCH MARK STAMPING: 0571 B 1981 DESIGNATION: 944 0571 B TIDAL MONUMENTATION: Tidal Station disk VM#: 8918 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Bedrock OPUS PID: LATITUDE: 46° 15.9' N ( 46.26500) LONGITUDE: 123° 39.2' W (-123.65300) The bench mark is a disk set flush in bedrock located along State Highway 403 near Dan Stephans residence, 15.73 m (51.6 ft) east of the utility/light pole, 15 m (48 ft) west of a utility pole, 5.55 m (18.2 ft) north of the centerline of the highway, and 0.06 m (0.2 ft) above the highway.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 9440571 PUBLICATION DATE: 01/23/2004 Name: ALTOONA, COLUMBIA RIVER WA NOAA Chart: 18523 Latitude: 46° 15.9' N ( 46.26500) USGS Quad: ROSBURG Longitude: 123° 39.2' W (-123.65300) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 0571 C 1981 DESIGNATION: 944 0571 C TIDAL MONUMENTATION: Tidal Station disk VM#: 8919 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Bedrock OPUS PID: LATITUDE: 46° 15.9' N ( 46.26500) LONGITUDE: 123° 39.2' W (-123.65300) The bench mark is a disk set flush in bedrock, 0.3 km (0.2 mi) west of the old cannery building, 91 m (300 ft) north of a rock island, which lies west of the cannery building, and 12 m (39 ft) south of the centerline of State Highway 403. BENCH MARK STAMPING: 0571 D 1981 DESIGNATION: 944 0571 D TIDAL MONUMENTATION: Tidal Station disk VM#: 8920 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Bedrock OPUS PID: LATITUDE: 46° 15.9' N ( 46.26500) LONGITUDE: 123° 39.2' W (-123.65300) The bench mark is a disk set flush in bedrock located along State Highway 403, 0.8 km (0.5 mi) west of the old cannery building, 87 m (284 ft) NE of two large free standing boulders at the bend in the highway, 15 m (50 ft) west of a utility pole, and 10 m (32 ft) north of the centerline of the highway.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 9440571 PUBLICATION DATE: 01/23/2004 Name: ALTOONA, COLUMBIA RIVER WA NOAA Chart: 18523 Latitude: 46° 15.9' N ( 46.26500) USGS Quad: ROSBURG Longitude: 123° 39.2' W (-123.65300) T I D A L D A T U M S Tidal datums at ALTOONA, COLUMBIA RIVER based on: LENGTH OF SERIES: 5 MONTHS TIME PERIOD: July 1981 - November 1981 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 9439040 ASTORIA, TONGUE POINT, COLUMBIA RIVER Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 2.474 MEAN HIGH WATER MHW = 2.272 MEAN TIDE LEVEL MTL = 1.288 MEAN SEA LEVEL MSL = 1.283 MEAN LOW WATER MLW = 0.303 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 4 1940 3.730 1.458 0571 A 1981 4.471 2.199 0571 B 1981 6.339 4.067 0571 C 1981 5.507 3.235 0571 D 1981 5.710 3.438
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 9440571 PUBLICATION DATE: 01/23/2004 Name: ALTOONA, COLUMBIA RIVER WA NOAA Chart: 18523 Latitude: 46° 15.9' N ( 46.26500) USGS Quad: ROSBURG Longitude: 123° 39.2' W (-123.65300) 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.