U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 12 Station ID: 9439011 PUBLICATION DATE: 07/27/2017 Name: HAMMOND, COLUMBIA RIVER OR NOAA Chart: 18521 Latitude: 46° 12.1' N ( 46.20170) USGS Quad: WARRENTON Longitude: 123° 56.7' W (-123.94500) To reach the tidal bench marks from Astoria, take Highway 101/26 south toward Seaside across Youngs Bay, after crossing the bay, take a right at the first intersection onto East Harbor Drive, follow East Harbor Drive to Warrenton, continue to follow East Harbor Drive toward Hammond and follow signs to Fort Stevens, Hammond, in Hammond, turn right onto Iredale Street. The tidal bench marks are located in the vicinity of the Hammond Boat Basin. Port of Portland tide gauge is located on the Columbia River Bar Pilots station at the NW edge of the boat basin near the entrance to the jetty. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 9011 A 1982 DESIGNATION: 943 9011 A TIDAL MONUMENTATION: Tidal Station disk VM#: 8869 AGENCY: National Ocean Survey (NOS) IDB PID#: AC5405 SETTING CLASSIFICATION: Stainless steel rod OPUS PID#: AC5405 LATITUDE: 46° 12.1' N ( 46.20106) LONGITUDE: 123° 57.0' W (-123.94928) The primary bench mark is disk located in a grassy area just NE of Iredale Street, 15.10 m (49.5 ft) NE of the centerline of the pavement of Iredale Street, 15.90 m (52.1 ft) SW of the Warrenton Waterfront Trail sign along dirt road, and 0.50 m (1.6 ft) SE of a witness post. The bench mark is set 10 cm (0.3 ft) below grade, crimped to the top of a stainless steel rod driven 10.9 m (36 ft) to refusal, and encased in a 6-inch PVC pipe with concrete kickblock and access cover.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 12 Station ID: 9439011 PUBLICATION DATE: 07/27/2017 Name: HAMMOND, COLUMBIA RIVER OR NOAA Chart: 18521 Latitude: 46° 12.1' N ( 46.20170) USGS Quad: WARRENTON Longitude: 123° 56.7' W (-123.94500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: SHRILL NO 1 1971 DESIGNATION: 943 9011 SHRILL TIDAL 1 MONUMENTATION: Survey disk VM#: 8867 AGENCY: US Army Corps of Engineers (USE) IDB PID#: AC5406 SETTING CLASSIFICATION: Concrete slab OPUS PID: LATITUDE: 46° 12.3' N ( 46.20500) LONGITUDE: 123° 57.2' W (-123.95300) The bench mark is a disk set flush in a 6-inch square concrete slab, 100 m (328 ft) north of a pole with a Standard Fuel sign, 24.38 m (80.0 ft) SE from the centerline of a road where the road meets a parking area, 4.27 m (14.0 ft) south from a large pine tree, 3.81 m (12.5 ft) east from the centerline of a road. BENCH MARK STAMPING: HAM BAY 1971 DESIGNATION: 943 9011 HAM BAY MONUMENTATION: Survey disk VM#: 8868 AGENCY: US Army Corps of Engineers (USE) IDB PID#: SETTING CLASSIFICATION: Concrete slab OPUS PID: LATITUDE: 46° 12.1' N ( 46.20153) LONGITUDE: 123° 57.0' W (-123.95058) The bench mark is a disk set in a 6-inch diameter irregularly shaped concrete mass flush with ground level, 111.00 m (364.2 ft) NW of bench mark 9011 A 1982, 16.67 m (54.7 ft) NE of the centerline of Iredale Street, 15.30 m (50.2 ft) SE of the apparent mean high water line, and 0.88 m (2.9 ft) north of a USE witness post.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 12 Station ID: 9439011 PUBLICATION DATE: 07/27/2017 Name: HAMMOND, COLUMBIA RIVER OR NOAA Chart: 18521 Latitude: 46° 12.1' N ( 46.20170) USGS Quad: WARRENTON Longitude: 123° 56.7' W (-123.94500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 9011 B 1982 DESIGNATION: 943 9011 B TIDAL MONUMENTATION: Tidal Station disk VM#: 8870 AGENCY: National Ocean Survey (NOS) IDB PID#: AC5403 SETTING CLASSIFICATION: Concrete retaining wall OPUS PID: LATITUDE: 46° 12.0' N ( 46.20000) LONGITUDE: 123° 56.9' W (-123.94800) The primary bench mark is a disk set in a 0.46 m (1.5 ft) wide retaining wall located at the seaward end of a sidewalk that leads from the NMFS parking lot through a hedge to the pier, 23.77 m (78.0 ft) NE of the NE edge of a parking lot, 0.61 m (2.0 ft) NW of the north edge of a wooden walkway, 0.40 m (1.3 ft) SW of an orange witness post, and 0.61 m (2.0 ft) below ground level. BENCH MARK STAMPING: 9011 C 1982 DESIGNATION: 943 9011 C MONUMENTATION: Tidal Station disk VM#: 8871 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 46° 12.2' N ( 46.20394) LONGITUDE: 123° 57.2' W (-123.95361) The bench mark is a disk located on the NW corner of a grassy area just NW of the parking lot for Hammond Marina, 16.15 m (53.0 ft) SE from the north edge of Lake Drive, 4.00 m (13.1 ft) NE of the northern edge of the parking area road, and 2.53 m (8.3 ft) NE of a yield sign. The bench mark is set 9 cm (0.3 ft) below grade, crimped to the top of a stainless steel rod driven 10.9 m (36 ft) to refusal, and encased in a 4-inch PVC pipe with concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 12 Station ID: 9439011 PUBLICATION DATE: 07/27/2017 Name: HAMMOND, COLUMBIA RIVER OR NOAA Chart: 18521 Latitude: 46° 12.1' N ( 46.20170) USGS Quad: WARRENTON Longitude: 123° 56.7' W (-123.94500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 9011 D 1982 DESIGNATION: 943 9011 D MONUMENTATION: Tidal Station disk VM#: 8872 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 46° 12.0' N ( 46.20000) LONGITUDE: 123° 56.4' W (-123.94000) The bench mark is a disk located near the east corner of the bait and tackle building at the Hammond Marina, 80.77 m (265 ft) SE of the corner of Lake Drive and Boat Basin Road, 5.79 m (19.0 ft) east of the east corner of the men's room, and 0.55 m (1.8 ft) south of a witness post. The bench mark is set 9 cm (0.3 ft) below grade, crimped to the top of a 9/16-inch stainless steel rod driven 12.2 m (40 ft) to refusal, and encased in a 4-inch PVC pipe with concrete kickblock. BENCH MARK STAMPING: 9011 E 1988 DESIGNATION: 943 9011 E TIDAL MONUMENTATION: Tidal Station disk VM#: 8873 AGENCY: National Ocean Service (NOS) IDB PID#: AC5404 SETTING CLASSIFICATION: Concrete step OPUS PID: LATITUDE: 46° 12.0' N ( 46.20000) LONGITUDE: 123° 56.9' W (-123.94800) The bench mark is a disk set in the concrete steps leading to the northern entrance of the main National Marine Fisheries Service Building in Hammond, on the west side of the fourth step, 0.24 m (0.8 ft) east from the west edge, 0.09 m (0.3 ft) north of the north edge of the porch, and 0.85 m (2.8 ft) above ground level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 12 Station ID: 9439011 PUBLICATION DATE: 07/27/2017 Name: HAMMOND, COLUMBIA RIVER OR NOAA Chart: 18521 Latitude: 46° 12.1' N ( 46.20170) USGS Quad: WARRENTON Longitude: 123° 56.7' W (-123.94500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 9011 G 1989 DESIGNATION: 943 9011 G MONUMENTATION: Tidal Station disk VM#: 8875 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete loading dock OPUS PID: LATITUDE: 46° 12.0' N ( 46.20000) LONGITUDE: 123° 56.4' W (-123.94000) The bench mark is a disk set flush in the concrete loading dock adjacent to the freezer building at Point Adams Packing Company, on the east side of the freezer building and on the west side of the extension of Fleet Street, 0.88 m (2.9 ft) north of the south edge of the loading dock, 0.88 m (2.9 ft) west of utility pole #089907, 0.24 m (0.8 ft) west of the east edge of the loading dock, and 1.10 m (3.6 ft) above road level. BENCH MARK STAMPING: 9011 H 1993 DESIGNATION: 943 9011 H MONUMENTATION: Tidal Station disk VM#: 16952 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete footing OPUS PID: LATITUDE: 46° 12.0' N ( 46.20000) LONGITUDE: 123° 56.4' W (-123.94000) The bench mark is a disk set flush in a concrete footing at the SE end of the Point Adams Packing Company's main building in Hammond, 25.15 m (82.5 ft) SW of the NE corner of the packing company, 11.80 m (38.7 ft) NE of the SE corner of the same building, 6.07 m (19.9 ft) SW of the SW end of the western-most of two low concrete walls surrounding the loading dock trailer parking, 0.43 m (1.4 ft) SE of the SE end of the building, 0.12 m (0.4 ft) NE of the SW end of the footing, and 0.27 m (0.9 ft) above grade.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 12 Station ID: 9439011 PUBLICATION DATE: 07/27/2017 Name: HAMMOND, COLUMBIA RIVER OR NOAA Chart: 18521 Latitude: 46° 12.1' N ( 46.20170) USGS Quad: WARRENTON Longitude: 123° 56.7' W (-123.94500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 9011 J 1993 DESIGNATION: 943 9011 J TIDAL MONUMENTATION: Tidal Station disk VM#: 16953 AGENCY: National Ocean Service (NOS) IDB PID#: AC5402 SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 46° 11.9' N ( 46.19830) LONGITUDE: 123° 56.8' W (-123.94700) The bench mark is a disk located at the NE corner of the intersection of Highway 104 and the road leading to the NMFS office, across the street from the Plhiladelphia Church in Hammond, 13.41 m (44 ft) NE of the centerline of Highway 104, 11 m (36 ft) east of the centerline of the road leading to the NMFS office, 2.26 m (7.4 ft) SE of a wooden telephone pole with a gray junction box, and 1.13 m (3.7 ft) north of an orange witness post. The bench mark is crimped to the top of a 9/16-inch stainless steel rod driven 19.5 m (64 ft) to refusal, and encased in a 6-inch PVC pipe with an aluminum access cover stamped "9011 J".
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 12 Station ID: 9439011 PUBLICATION DATE: 07/27/2017 Name: HAMMOND, COLUMBIA RIVER OR NOAA Chart: 18521 Latitude: 46° 12.1' N ( 46.20170) USGS Quad: WARRENTON Longitude: 123° 56.7' W (-123.94500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 9011 K 1993 DESIGNATION: 943 9011 K TIDAL MONUMENTATION: Tidal Station disk VM#: 16954 AGENCY: National Ocean Service (NOS) IDB PID#: AC5401 SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 46° 11.8' N ( 46.19670) LONGITUDE: 123° 56.6' W (-123.94300) The bench mark is a disk located at the NE corner of the intersection of Highway 104 and Gray Street in Hammond, 10 m (33 ft) NE of the centerline of Highway 104, 4.57 m (15.0 ft) NW of the centerline of Gray Street, 3.20 m (10.5 ft) north of a sewer manhole cover, 3.20 m (10.5 ft) east of a yellow fire hydrant, 0.52 m (1.7 ft) NW of a stop sign, and 0.3 m (1 ft) NE of an orange witness post. The bench mark is crimped to the top of a 9/16-inch stainless steel rod driven 15.8 m (52 ft) to refusal, and encased in a 6-inch PVC pipe with an aluminum access cover stamped "9011 K".
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 8 of 12 Station ID: 9439011 PUBLICATION DATE: 07/27/2017 Name: HAMMOND, COLUMBIA RIVER OR NOAA Chart: 18521 Latitude: 46° 12.1' N ( 46.20170) USGS Quad: WARRENTON Longitude: 123° 56.7' W (-123.94500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 9011 L 2011 DESIGNATION: 943 9011 L MONUMENTATION: Metal Rod VM#: 20162 AGENCY: National Ocean Service IDB PID#: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 46° 12.3' N ( 46.20475) LONGITUDE: 123° 57.1' W (-123.95106) The bench mark is a stainless steel rod located on the edge of the corner of the driveway leading to 1090 First Avenue, 9.24 m (30.3 ft) SE of the centerline of the loop in Lake Drive, 22.00 m (72.2 ft) NW of the dispatch CONEX container for the Columbia River Bar Pilots, 43.50 m (142.7 ft) NNE of a utility pole #055300, 4.70 m (15.4 ft) SW of the centerline of the driveway of 1090 First Avenue, 0.50 m (1.6 ft) north of an orange witness post. The datum point is set 10 cm (0.3 ft) below grade, being the top of a stainless steel rod driven 24.3 m (80 ft) encased in 6 inch PVC pipe with access cover.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 9 of 12 Station ID: 9439011 PUBLICATION DATE: 07/27/2017 Name: HAMMOND, COLUMBIA RIVER OR NOAA Chart: 18521 Latitude: 46° 12.1' N ( 46.20170) USGS Quad: WARRENTON Longitude: 123° 56.7' W (-123.94500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: UNSTAMPED DESIGNATION: UNSTAMPED MONUMENTATION: Survey disk VM#: 20163 AGENCY: City of Hammond IDB PID#: SETTING CLASSIFICATION: Set in concrete structure OPUS PID: LATITUDE: 46° 12.2' N ( 46.20261) LONGITUDE: 123° 57.1' W (-123.95231) The bench mark is a disk set flush in a large concrete loading ramp leading to the center of the boat launch to the boat basin, 22.00 m (72.2 ft) North of a the #10 light utility pole with power meter, 15.60 m (51.1 ft) SW of first metal piling in the center of the boat ramp pier, 6.00 m (19.7 ft) NE of the edge of the concrete ramp in the center of the boat launch, and is 0.60 m (1.9 ft) above the ground surface of the boat launch.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 10 of 12 Station ID: 9439011 PUBLICATION DATE: 07/27/2017 Name: HAMMOND, COLUMBIA RIVER OR NOAA Chart: 18521 Latitude: 46° 12.1' N ( 46.20170) USGS Quad: WARRENTON Longitude: 123° 56.7' W (-123.94500) T I D A L D A T U M S Tidal datums at HAMMOND, COLUMBIA RIVER based on: LENGTH OF SERIES: 2 YEARS TIME PERIOD: May 2012 - April 2014 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: HIGHEST OBSERVED WATER LEVEL (11/24/2011) = 3.559 MEAN HIGHER HIGH WATER MHHW = 2.546 MEAN HIGH WATER MHW = 2.330 MEAN TIDE LEVEL MTL = 1.357 MEAN SEA LEVEL MSL = 1.335 MEAN LOW WATER MLW = 0.383 North American Vertical Datum NAVD88 = 0.017 MEAN LOWER LOW WATER MLLW = 0.000 LOWEST OBSERVED WATER LEVEL (02/06/1989) = -0.982 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 9011 A 1982 5.427 3.097 SHRILL NO 1 1971 3.477 1.147 HAM BAY 1971 5.156 2.826 9011 B 1982 3.769 1.439 9011 C 1982 3.781 1.451 9011 D 1982 5.932 3.602 9011 E 1988 5.723 3.393 9011 G 1989 5.727 3.397 9011 H 1993 5.074 2.744 9011 J 1993 4.176 1.846 9011 K 1993 3.721 1.391 9011 L 2011 4.012 1.682 UNSTAMPED 3.709 1.379
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 11 of 12 Station ID: 9439011 PUBLICATION DATE: 07/27/2017 Name: HAMMOND, COLUMBIA RIVER OR NOAA Chart: 18521 Latitude: 46° 12.1' N ( 46.20170) USGS Quad: WARRENTON Longitude: 123° 56.7' W (-123.94500) Foot Notes: Bench marks 9011 H 1993, 9011 J 1993 and 9011 K 1993 are based on one differential leveling connection and do not meet the quality control standards of the NOS. Therefore, caution should be used when deriving elevations for these marks.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 12 of 12 Station ID: 9439011 PUBLICATION DATE: 07/27/2017 Name: HAMMOND, COLUMBIA RIVER OR NOAA Chart: 18521 Latitude: 46° 12.1' N ( 46.20170) USGS Quad: WARRENTON Longitude: 123° 56.7' W (-123.94500) 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.