U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 7 Station ID: 9440422 PUBLICATION DATE: 09/20/2023 Name: LONGVIEW, COLUMBIA RIVER WA NOAA Chart: 18524 Latitude: 46° 6.4' N ( 46.10614) USGS Quad: RAINIER Longitude: 122° 57.3' W (-122.95419) To reach the tidal bench marks from the Lewis and Clark Bridge over the Columbia River (Highway 433) in Longview, turn west at the north bridge approach and follow sign to Port Docks. Drive straight toward the river along the east side of the bridge structure until you reach the Port of Longview office. Veer left, stop at security shack, then drive straight to the water front. Turn left on the wharf and drive about 300 m (1000 ft) up the river under a grain conveyor and stop at Transit Shed 3. The tide house is located adjacent to the SE corner of Transit Shed 3. The tidal bench mark are located located in the vicinity. The tide station is a 6 x 6 fiberglass house. The sensors are located beneath the pier deck and can be accessed by a set of stairs 20 m SE of the tide house. The sensors are about 10 m west of the bottom of the stairs, adjacent to and on each side of the catwalk. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: LVW-A 1985 DESIGNATION: 944 0422 A TIDAL MONUMENTATION: Tidal Station disk VM#: 16641 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete retaining wall OPUS PID: LATITUDE: 46° 6.5' N ( 46.10753) LONGITUDE: 122° 57.4' W (-122.95672) The bench mark is a disk set flush in a 0.15 m (0.5 ft) wide concrete retaining wall which is level with the asphalt pavement, located along the northern side of transit shed No. 2, Port of Longview, 26.52 m (87.0 ft) south of gear locker "A", 19.20 m (63.0 ft) NE of the NW corner of shed No. 2 at the end of a yellow wooden bullrail, 4.36 m (14.3 ft) north of transit shed No. 2, and 0.24 m (0.8 ft) east of the east end of bullrail.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 7 Station ID: 9440422 PUBLICATION DATE: 09/20/2023 Name: LONGVIEW, COLUMBIA RIVER WA NOAA Chart: 18524 Latitude: 46° 6.4' N ( 46.10614) USGS Quad: RAINIER Longitude: 122° 57.3' W (-122.95419) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 0422 D 1990 DESIGNATION: 944 0422 D MONUMENTATION: Tidal Station disk VM#: 16642 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete column support foundation OPUS PID: LATITUDE: 46° 6.4' N ( 46.10697) LONGITUDE: 122° 57.3' W (-122.95556) The bench mark is a disk set flush in a square concrete bumper cast around the western-most "I" beam column which supports the north lean to shed at transit shed 3, 5.24 m (17.2 ft) SW of railroad tracks, 4.45 m (14.6 ft) NE of the northern-most corner of transit shed 3, and 1.22 m (4.0 ft) above the roadway. BENCH MARK STAMPING: 0422 E 2004 DESIGNATION: 944 0422 E MONUMENTATION: Flange-encased Rod VM#: 17732 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID: LATITUDE: 46° 6.4' N ( 46.10639) LONGITUDE: 122° 57.3' W (-122.95417) The primary bench mark is located on the south side of the shore road by Berth 3 at the Port of Longview, WA, located at the NW corner of a condemned section of Berth 3, 25.48 m (83.6 ft) SW of a group of 3 red water valves surrounded by yellow crash guard, 21.64 m (71.0 ft) SE of a yellow fire hydrant, 19.20 m (63.0 ft) south of the south rail of the railroad tracks, and north of an orange fiberglass witness post. The bench mark is top of a 1/2-inch stainless steel rod driven 34.1 m (112 ft) to refusal and encased inside a 5-inch PVC pipe with an aluminum hinged cover stamped 0422 E 2004.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 7 Station ID: 9440422 PUBLICATION DATE: 09/20/2023 Name: LONGVIEW, COLUMBIA RIVER WA NOAA Chart: 18524 Latitude: 46° 6.4' N ( 46.10614) USGS Quad: RAINIER Longitude: 122° 57.3' W (-122.95419) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 0422 F 2004 DESIGNATION: 944 0422 F MONUMENTATION: Tidal Station disk VM#: 17733 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete foundation OPUS PID: LATITUDE: 46° 6.3' N ( 46.10444) LONGITUDE: 122° 57.0' W (-122.95000) The bench mark is a disk set in the SW side of the concrete base of a large green tank on the north side of the shore road at Berth 5 at the Port of Longview, WA, located below a "Speed Limit 8" sign, 25.76 m (84.5 ft) west of a fire hydrant on the south side of the road, 7.22 m (23.7 ft) north of a guard rail on the south side of the road, 4.72 m (15.5 ft) SE of the door on the south side of a small building on the west side of the tank, and 0.73 m (2.4 ft) above the ground. BENCH MARK STAMPING: 0422 G 2004 DESIGNATION: 944 0422 G MONUMENTATION: Flange-encased Rod VM#: 17734 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID: LATITUDE: 46° 6.3' N ( 46.10528) LONGITUDE: 122° 57.1' W (-122.95194) The bench mark is located on the south side of the shore road north of Berth 4 at the Port of Longview, Wa, located 17.68 m (58.0 ft) south of the centerline of the road, 2.13 m (7.0 ft) north of the top of the slope to the river, 2.04 m (6.7 ft) SE of the end of the concrete parking barrier, 0.98 m (3.2 ft) south of the west end of the guard rail, and north of an orange fiberglass witness post. The bench mark is top of a 1/2-inch stainless steel rod driven 4.9 m (16.1 ft) to refusal, and encased inside a 5-inch PVC pipe with an aluminum hinged cover stamped 0422 G 2004.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 7 Station ID: 9440422 PUBLICATION DATE: 09/20/2023 Name: LONGVIEW, COLUMBIA RIVER WA NOAA Chart: 18524 Latitude: 46° 6.4' N ( 46.10614) USGS Quad: RAINIER Longitude: 122° 57.3' W (-122.95419) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 0422 H 2004 DESIGNATION: 944 0422 H MONUMENTATION: Flange-encased Rod VM#: 17735 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID: LATITUDE: 46° 6.3' N ( 46.10492) LONGITUDE: 122° 57.1' W (-122.95092) The bench mark is located on the south side of the shore road, north of the east end of Berth 4 at the Port of Longview, Wa, located 26.0 m (85.3 ft) west of the SW corner of "Small Building 76" which covers some picnic tables, 2.59 m (8.5 ft) north of the top of the slope to the river, 1.46 m (4.8 ft) south of a yellow guard rail, and north of an orange fiberglass witness post. The bench mark is top of a 1/2-inch stainless steel rod driven 26.8 m (88 ft) to refusal and encased inside a 5-inch PVC pipe with an aluminum hinged cover stamped 0422 H 2004. BENCH MARK STAMPING: 0422 J 2004 DESIGNATION: 944 0422 J MONUMENTATION: Tidal Station disk VM#: 17736 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete ramp OPUS PID: LATITUDE: 46° 6.3' N ( 46.10550) LONGITUDE: 122° 57.1' W (-122.95233) The bench mark is a disk set in the top of a concrete ramp leading to the south entrance of a metal building on the north side of the shore road between Berth 4 and 5 at the Port of Longview, WA, located 19.35 m (63.5 ft) west of the SE corner of the building, 11.16 m (36.6 ft) north of the south side of the road, 5.43 m (17.8 ft) east of the SW edge of the building, and 0.70 m (2.3 ft) above the ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 7 Station ID: 9440422 PUBLICATION DATE: 09/20/2023 Name: LONGVIEW, COLUMBIA RIVER WA NOAA Chart: 18524 Latitude: 46° 6.4' N ( 46.10614) USGS Quad: RAINIER Longitude: 122° 57.3' W (-122.95419) T I D A L D A T U M S Tidal datums at LONGVIEW, COLUMBIA RIVER based on: LENGTH OF SERIES: 14 Years TIME PERIOD: 8/2002 - 9/2015 Low Water Months Only TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 9439040 ASTORIA, TONGUE POINT, COLUMBIA RIVER Elevations of tidal datums referred to Columbia River Datum (CRD), in METERS: MEAN HIGHER HIGH WATER MHHW = 1.992 MEAN HIGH WATER MHW = 1.849 MEAN TIDE LEVEL MTL = 1.289 MEAN SEA LEVEL MSL = 1.243 MEAN LOW WATER MLW = 0.729 MEAN LOWER LOW WATER MLLW = 0.629 COLUMBIA RIVER DATUM CRD = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MHW CRD LVW-A 1985 7.213 9.062 0422 D 1990 8.203 10.052 0422 E 2004 7.018 8.867 0422 F 2004 7.484 9.333 0422 G 2004 5.967 7.816 0422 H 2004 7.255 9.104 0422 J 2004 4.864 6.713
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 7 Station ID: 9440422 PUBLICATION DATE: 09/20/2023 Name: LONGVIEW, COLUMBIA RIVER WA NOAA Chart: 18524 Latitude: 46° 6.4' N ( 46.10614) USGS Quad: RAINIER Longitude: 122° 57.3' W (-122.95419) Foot Notes: Columbia River Datum (CRD) is the adopted fixed low water reference plane for this area. CRD is a U.S. Army Corps of Engineers non-tidal datum defined at distinct river miles relative to NAVD88, and is used as chart datum above river mile 23 on the Columbia River. Datums are computed using observations from the low river stages of the year, generally August through October due to the masking of the tidal signal from strong seasonal river runoff during other portions of the year. Depending on river flow, water levels can be significantly higher than Columbia River Datum. As of 2014, the U.S. Army Corps of Engineers provided updated offsets for CRD that have been applied to this station. Station Datum (STND) is no longer set equal to CRD.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 7 Station ID: 9440422 PUBLICATION DATE: 09/20/2023 Name: LONGVIEW, COLUMBIA RIVER WA NOAA Chart: 18524 Latitude: 46° 6.4' N ( 46.10614) USGS Quad: RAINIER Longitude: 122° 57.3' W (-122.95419) 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.