U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 6 Station ID: 9449771 PUBLICATION DATE: 06/15/2016 Name: ROSARIO, ORCAS ISLAND WA NOAA Chart: 18430 Latitude: 48° 38.8' N ( 48.64670) USGS Quad: MOUNT CONSTITUTION Longitude: 122° 52.2' W (-122.87000) To reach the tidal bench marks, proceed to the Rosario Resort Hotel property on Cascade Bay. The tide staff and gage were located on the pier east of the First Mate Cafe and north of the rip rap jetty. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 9771 A 2015 DESIGNATION: 944 9771 A MONUMENTATION: Tidal Station disk VM#: 21790 AGENCY: National Ocean Service IDB PID#: SETTING CLASSIFICATION: rock outcrop OPUS PID#: BBDY48 LATITUDE: 48° 38.7' N ( 48.64572) LONGITUDE: 122° 52.3' W (-122.87183) The bench mark is a disk set in a bedrock outcrop SW of the Rosario resort marina above a gravel parking area, 17.78 m (58.3 ft) NE of the nearest pillar of the white circular guest house number 1320, 15.62 m (51.2 ft) ENE of a large cedar tree, 9.19 m (30.2 ft) WSW of the lone cedar tree above rock face along the waterfront, 3.15 m (10.3 ft) WNW of the nearest edge of the sidewalk, and 1.90 m (6.2 ft) SE of the edge of the rock bluff above the parking area.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 6 Station ID: 9449771 PUBLICATION DATE: 06/15/2016 Name: ROSARIO, ORCAS ISLAND WA NOAA Chart: 18430 Latitude: 48° 38.8' N ( 48.64670) USGS Quad: MOUNT CONSTITUTION Longitude: 122° 52.2' W (-122.87000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 1 1935 DESIGNATION: 944 9771 TIDAL 1 MONUMENTATION: Tidal Station disk VM#: 14395 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: SETTING CLASSIFICATION: Concrete foundation OPUS PID: LATITUDE: 48° 38.8' N ( 48.64731) LONGITUDE: 122° 52.2' W (-122.87069) The bench mark is a disk set in a concrete foundation of a large white building motel called Boatel at the Rosario Resort, 18.29 m (60.0 ft) inshore from a large privately owned pier and 0.15 m (0.5 ft) east of the SW corner of the building. BENCH MARK STAMPING: 3 1935 DESIGNATION: 944 9771 TIDAL 3 MONUMENTATION: Tidal Station disk VM#: 14397 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: SETTING CLASSIFICATION: Concrete foundation OPUS PID: LATITUDE: 48° 38.9' N ( 48.64767) LONGITUDE: 122° 52.3' W (-122.87089) The bench mark is a disk set flush with the sidewalk in a concrete foundation of a generator house, 58 m (190 ft) NW of the Rosario Resort pier with gas pumps and 0.3 m (1 ft) east of the SW corner on the south side of the building.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 6 Station ID: 9449771 PUBLICATION DATE: 06/15/2016 Name: ROSARIO, ORCAS ISLAND WA NOAA Chart: 18430 Latitude: 48° 38.8' N ( 48.64670) USGS Quad: MOUNT CONSTITUTION Longitude: 122° 52.2' W (-122.87000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 4 1935 DESIGNATION: 944 9771 TIDAL 4 MONUMENTATION: Tidal Station disk VM#: 14398 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: SETTING CLASSIFICATION: Rock outcrop OPUS PID: LATITUDE: 48° 38.7' N ( 48.64569) LONGITUDE: 122° 52.4' W (-122.87286) The bench mark is a disk set in the top of a rock outcrop, the highest point of knoll back of a small promontory jutting from the west shore of Rosario Harbor, 247 m (810 ft) along the cement walk from the pier toward Rosario Resorts main lodge, 201.17 m (660.0 ft) SW of Rosario Resort pier with gas pumps and 15.24 m (50.0 ft) south of the sidewalk. BENCH MARK STAMPING: BM 7 1973 DESIGNATION: 944 9771 TIDAL 7 MONUMENTATION: Tidal Station disk VM#: 14400 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete sidewalk OPUS PID: LATITUDE: 48° 38.8' N ( 48.64703) LONGITUDE: 122° 52.3' W (-122.87150) The bench mark is a disk set horizontally in a concrete sidewalk on the north side of the boat basin, south of a ship's figurehead at break in handrail, 112.78 m (370.0 ft) NE of bench mark 6 1973, 1.52 m (5.0 ft) north of a concrete block stamped 1951, 0.21 m (0.7 ft) from a rail post and 0.09 m (0.3 ft) from the edge of the sidewalk.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 6 Station ID: 9449771 PUBLICATION DATE: 06/15/2016 Name: ROSARIO, ORCAS ISLAND WA NOAA Chart: 18430 Latitude: 48° 38.8' N ( 48.64670) USGS Quad: MOUNT CONSTITUTION Longitude: 122° 52.2' W (-122.87000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: MC 1935 T37N R1W T36N R1W DESIGNATION: MC 1935 T37N R1W T36N R1W MONUMENTATION: Boundry marker VM#: 21791 AGENCY: IDB PID#: SETTING CLASSIFICATION: OPUS PID: LATITUDE: 48° 38.7' N ( 48.64511) LONGITUDE: 122° 52.3' W (-122.87236) The bench mark is a disk without an agency logo on a concrete pedestal, 11.28 m (37.0 ft) (slope distance) ESE of a stone wall, 10.13 m (33.2 ft) S of the SE corner support for the stairs at the SE corner of 1300 Skagit building, 7.40 m (24.3 ft) E of the gravel path, 4.05 m (13.3 ft) NE of the pine tree leaning at a 45 degree angle, 2.00 m (6.6 ft) NW of the edge of the vegetation above the rock shoreline and set in the top of a 13-cm square concrete post that is 0.44 m (1.4 ft) tall.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 6 Station ID: 9449771 PUBLICATION DATE: 06/15/2016 Name: ROSARIO, ORCAS ISLAND WA NOAA Chart: 18430 Latitude: 48° 38.8' N ( 48.64670) USGS Quad: MOUNT CONSTITUTION Longitude: 122° 52.2' W (-122.87000) T I D A L D A T U M S Tidal datums at ROSARIO, ORCAS ISLAND based on: LENGTH OF SERIES: 3 MONTHS TIME PERIOD: August 2015 - October 2015 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 9449880 FRIDAY HARBOR, SAN JUAN CHANNEL Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 2.404 MEAN HIGH WATER MHW = 2.208 MEAN TIDE LEVEL MTL = 1.455 MEAN SEA LEVEL MSL = 1.416 MEAN LOW WATER MLW = 0.703 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 9771 A 2015 9.311 7.103 1 1935 3.912 1.704 3 1935 4.480 2.272 4 1935 13.188 10.980 BM 7 1973 3.890 1.682 MC 1935 T37N R1W T36N R1W 6.441 4.233
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 6 Station ID: 9449771 PUBLICATION DATE: 06/15/2016 Name: ROSARIO, ORCAS ISLAND WA NOAA Chart: 18430 Latitude: 48° 38.8' N ( 48.64670) USGS Quad: MOUNT CONSTITUTION Longitude: 122° 52.2' W (-122.87000) 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.