U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 9451467 PUBLICATION DATE: 08/13/2013 Name: RED BLUFF BAY, BARANOF ISLAND AK NOAA Chart: 17336 Latitude: 56° 51.4' N ( 56.85670) USGS Quad: PORT ALEXANDER Longitude: 134° 43.4' W (-134.72300) To reach the tidal bench marks from Sitka, AK, by boat, start at the rock jetty entrance to the small boat harbor and proceed for 0.36 nm (0.67 km) on course, then proceed for 2.08 nm (3.84km) past Passage Islands, then proceed for 14.99 nm (27.76 km) past Biorka Island, then proceed for 52.87nm (97.91 km) to the most southern point of Baranof Island, then proceed for 3.40 nm (6.30 km) to past Wooden Island, then proceed for 29.55 nm (54.73 km), then proceed for 11.74 nm (21.73km), then proceed for 1.29 nm (2.39 km) to the entrance of Red Bluff Bay, then proceed for 0.21 nm (0.40 km), then proceed for 0.18 nm (0.34 km), then proceed for 0.27 nm (0.49 km), then proceed for 0.17 nm (0.31 km) then proceed for 0.34 nm (0.63 km), and finally, proceed for 0.29 nm (0.54 km). The bench marks are located on the northeastern portion of Red Bluff Bay, at an old cannery site, set in boulders and bedrock along the beach. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: A 1926 DESIGNATION: 945 1467 A MONUMENTATION: Survey disk VM#: 14132 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: SETTING CLASSIFICATION: Boulder OPUS PID: LATITUDE: 56° 51.3' N ( 56.85575) LONGITUDE: 134° 43.5' W (-134.72461) The primary benchmark is a set flush in a crevice in the top of a large pointed boulder, 2.6 km (8530 ft) NE of the reference peak across the bay, 65.64 m (215.35 ft) SE of bench mark 945 1467 TIDAL 1, 65.49 m (214.86 ft) SE of bench mark 945 1467 B, 59.56 m (195.41 ft) WNW of bench mark 945 1467 TIDAL 3, and 36.12 m (118.50 ft) WNW of bench mark 945 1467 C.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 9451467 PUBLICATION DATE: 08/13/2013 Name: RED BLUFF BAY, BARANOF ISLAND AK NOAA Chart: 17336 Latitude: 56° 51.4' N ( 56.85670) USGS Quad: PORT ALEXANDER Longitude: 134° 43.4' W (-134.72300) T I D A L B E N C H M A R K S BENCH MARK STAMPING: B 1926 DESIGNATION: 945 1467 B MONUMENTATION: Survey disk VM#: 14133 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: SETTING CLASSIFICATION: Boulder OPUS PID: LATITUDE: 56° 51.4' N ( 56.85622) LONGITUDE: 134° 43.5' W (-134.72528) The benchmark is set flush on top of a large flat boulder adjacent to an old cannery boiler on the extreme eastern edge of the grassy beach, 2.9 km (9514 ft) NE of the reference peak across the bay, 123.77 m (406.07 ft) WNW of the bench mark 945 1467 TIDAL 3, 100.54 m (329.86 ft) WNW of bench mark 945 1467 C, 65.49 m (214.86 ft) NNW of bench mark 945 1467 A, and 22.29 m (73.13 ft) NE of bench mark 945 1467 TIDAL 1. BENCH MARK STAMPING: C 1926 DESIGNATION: 945 1467 C MONUMENTATION: Survey disk VM#: 14134 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: SETTING CLASSIFICATION: Boulder OPUS PID: LATITUDE: 56° 51.3' N ( 56.85544) LONGITUDE: 134° 43.5' W (-134.72442) The benchmark is set flush on the point of a ledge of bedrock, 2.2 km (7218 ft) ENE of the reference peak across the bay, 100.54 m (329.86 ft) ESE of bench mark 945 1467 B, 97.16 m (318.77 ft) SE of bench mark 945 1467 TIDAL 1, 36.12 m (118.50 ft) ESE of bench mark 945 1467 A, and 23.56 m (77.30 ft) WNW of bench mark 945 1467 3.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 9451467 PUBLICATION DATE: 08/13/2013 Name: RED BLUFF BAY, BARANOF ISLAND AK NOAA Chart: 17336 Latitude: 56° 51.4' N ( 56.85670) USGS Quad: PORT ALEXANDER Longitude: 134° 43.4' W (-134.72300) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 1 1926 DESIGNATION: 945 1467 TIDAL 1 MONUMENTATION: Survey disk VM#: 14135 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: SETTING CLASSIFICATION: Boulder OPUS PID: LATITUDE: 56° 51.4' N ( 56.85608) LONGITUDE: 134° 43.5' W (-134.72553) The benchmark is a set flush in a boulder near the center of the obvious flat grassy beach, 2.9 km (9514 ft) NE of the reference peak across the bay (Mt. Harding), 119.49 m (392.03 ft) NW of bench mark 945 1467 TIDAL 3, 97.16 m (318.77 ft) NW of bench mark 945 1467 C, 65.64 m (215.35 ft) WNW of bench mark 945 1467 A , and 22.29 m (73.13 ft) SW of bench mark 945 1467 B.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 9451467 PUBLICATION DATE: 08/13/2013 Name: RED BLUFF BAY, BARANOF ISLAND AK NOAA Chart: 17336 Latitude: 56° 51.4' N ( 56.85670) USGS Quad: PORT ALEXANDER Longitude: 134° 43.4' W (-134.72300) T I D A L D A T U M S Tidal datums at RED BLUFF BAY, BARANOF ISLAND based on: LENGTH OF SERIES: 30 Days TIME PERIOD: May 30 2013 - June 28 2013 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 9451054 PORT ALEXANDER, BARANOF ISLAND Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 3.904 MEAN HIGH WATER MHW = 3.631 MEAN SEA LEVEL MSL = 2.069 MEAN TIDE LEVEL MTL = 2.048 MEAN LOW WATER MLW = 0.465 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW A 1926 2.916 -0.715 B 1926 3.312 -0.319 C 1926 2.587 -1.043 1 1926 2.694 -0.937
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 9451467 PUBLICATION DATE: 08/13/2013 Name: RED BLUFF BAY, BARANOF ISLAND AK NOAA Chart: 17336 Latitude: 56° 51.4' N ( 56.85670) USGS Quad: PORT ALEXANDER Longitude: 134° 43.4' W (-134.72300) 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.