U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 9432879 PUBLICATION DATE: 07/15/2004 Name: SITKA DOCK, COOS BAY OR NOAA Chart: 18587 Latitude: 43° 22.6' N ( 43.37670) USGS Quad: CHARLESTON Longitude: 124° 17.8' W (-124.29700) To reach the tidal bench marks from the intersection of Newmark Avenue and Empire Boulevard (Cape Arago Highway) in Coos Bay, proceed south on Empire Boulevard for 2.4 km (1.5 mi) to Old Mill Road on the west side of the Boulevard, then turn right and proceed west on Old Mill Road through the gate for 0.40 km (0.25 mi) to the abandoned Sitka Dock. The bench marks are along Old Mill Road. The tide gage and staff were on the north side of the dock, approximately 183 m (600 ft) from the shore. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: BENCH MARK NO 4 1960 DESIGNATION: 943 2879 TIDAL 4 MONUMENTATION: Tidal Station disk VM#: 8803 AGENCY: US Army Corps of Engineers (USE) IDB PID#: OA0638 SETTING CLASSIFICATION: Foundation OPUS PID#: OA0638 LATITUDE: 43° 22.4' N ( 43.37330) LONGITUDE: 124° 17.7' W (-124.29500) The bench mark is a disk set flush in the SW corner of the concrete foundation of an old mechanics shop building, 53 m (175 ft) east of the east end of the dock ramp.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 9432879 PUBLICATION DATE: 07/15/2004 Name: SITKA DOCK, COOS BAY OR NOAA Chart: 18587 Latitude: 43° 22.6' N ( 43.37670) USGS Quad: CHARLESTON Longitude: 124° 17.8' W (-124.29700) T I D A L B E N C H M A R K S BENCH MARK STAMPING: TIDAL SITKA 5 1976 DESIGNATION: 943 2879 TIDAL SITKA 5 MONUMENTATION: Tidal Station disk VM#: 8804 AGENCY: US Army Corps of Engineers (USE) IDB PID#: OA0636 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 43° 22.4' N ( 43.37330) LONGITUDE: 124° 17.6' W (-124.29300) The bench mark is a disk set flush in a concrete monument on the south side of Old Mill Road, about midway between bench marks TIDAL SITKA 6 1976 and 2879 A 1982, 1 m (3 ft) south of utility pole #PPL 2513 303505, and at ground level. BENCH MARK STAMPING: TIDAL SITKA 6 1976 DESIGNATION: 943 2879 TIDAL SITKA 6 MONUMENTATION: Tidal Station disk VM#: 8805 AGENCY: US Army Corps of Engineers (USE) IDB PID#: OA0635 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 43° 22.4' N ( 43.37330) LONGITUDE: 124° 17.5' W (-124.29200) The bench mark is a disk set flush in a concrete monument SW of the gate on Old Mill Road, at the bend in the road, 3 m (10 ft) SE of the Y in the road, and at ground level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 9432879 PUBLICATION DATE: 07/15/2004 Name: SITKA DOCK, COOS BAY OR NOAA Chart: 18587 Latitude: 43° 22.6' N ( 43.37670) USGS Quad: CHARLESTON Longitude: 124° 17.8' W (-124.29700) T I D A L B E N C H M A R K S BENCH MARK STAMPING: TIDAL SITKA 7 1976 PORTLAND DIST. DESIGNATION: 943 2879 TIDAL SITKA 7 MONUMENTATION: Tidal Station disk VM#: 8806 AGENCY: US Army Corps of Engineers (USE) IDB PID#: OA0639 SETTING CLASSIFICATION: Concrete pad OPUS PID: LATITUDE: 43° 22.4' N ( 43.37330) LONGITUDE: 124° 17.7' W (-124.29500) The bench mark is a disk set flush in the NW corner of a 2 m x 3 m (8 ft x 10 ft) concrete pad, 59 m (194 ft) SSE of bench mark BENCH MARK NO 4 1960, 24 m (78 ft) south of the centerline of Old Mill Road, and at ground level. BENCH MARK STAMPING: 2879 A 1982 DESIGNATION: 943 2879 A TIDAL MONUMENTATION: Tidal Station disk VM#: 8807 AGENCY: National Ocean Survey (NOS) IDB PID#: OA0637 SETTING CLASSIFICATION: Concrete footing OPUS PID: LATITUDE: 43° 22.4' N ( 43.37330) LONGITUDE: 124° 17.6' W (-124.29300) The bench mark is a disk set flush in the south end of a 0.91 m x 2.68 m x 0.91 m (3.0 ft x 8.8 ft x 3.0 ft) concrete footing SE of the mechanics shop, 16.76 m (55.0 ft) NE of the most southern corner of the mechanics shop, and 8.23 m (27.0 ft) SE of the most eastern corner of the mechanics shop.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 9432879 PUBLICATION DATE: 07/15/2004 Name: SITKA DOCK, COOS BAY OR NOAA Chart: 18587 Latitude: 43° 22.6' N ( 43.37670) USGS Quad: CHARLESTON Longitude: 124° 17.8' W (-124.29700) T I D A L D A T U M S Tidal datums at SITKA DOCK, COOS BAY based on: LENGTH OF SERIES: 1 MONTH TIME PERIOD: September 1982 - September 1982 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 9432780 CHARLESTON, COOS BAY Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 2.353 MEAN HIGH WATER MHW = 2.150 MEAN SEA LEVEL MSL = 1.273 MEAN TIDE LEVEL MTL = 1.270 MEAN LOW WATER MLW = 0.390 North American Vertical Datum NAVD88 = 0.178 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW BENCH MARK NO 4 1960 4.016 1.866 TIDAL SITKA 5 1976 3.395 1.245 TIDAL SITKA 6 1976 4.547 2.397 TIDAL SITKA 7 1976 PORTLAND DIST. 3.501 1.351 2879 A 1982 4.932 2.782
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 9432879 PUBLICATION DATE: 07/15/2004 Name: SITKA DOCK, COOS BAY OR NOAA Chart: 18587 Latitude: 43° 22.6' N ( 43.37670) USGS Quad: CHARLESTON Longitude: 124° 17.8' W (-124.29700) 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.