U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 7 Station ID: 9455963 PUBLICATION DATE: 12/05/2013 Name: GOOSE CREEK KNIK ARM, COOK INLET AK NOAA Chart: 16660 Latitude: 61° 23.6' N ( 61.39330) USGS Quad: ANCHORAGE B-8 NW Longitude: 149° 50.8' W (-149.84700) To reach the tidal bench marks from Anchorage, proceed by boat north for about 19 km (12 mi) to Goose Bay and Goose Creek on the west side of Knik Arm. The bench marks can also be reached by road from Anchorage by going around Knik Arm for about 103 km (64 mi). The bench marks are along the west shoreline of Knik Arm about 2.4 km (1.5 mi) north of Goose Creek. In the area there is a row of old pier pilings, a gravel road leading up from the beach to a gravel airstrip, and a large excavated gravel pit. The tide gage and staff were on the row of old pier pilings. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: TIDAL BM 4 1975 DESIGNATION: 945 5963 TIDAL 4 MONUMENTATION: Azimuth Mark disk VM#: 9565 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID: LATITUDE: 61° 23.6' N ( 61.39261) LONGITUDE: 149° 50.9' W (-149.84894) The primary bench mark is a disk located along the unnamed gravel road leading to a small gravel parking area directly south of the Goose Bay Airstrip, 8.71 m (28.6 ft) NE of the centerline of the unnamed gravel road, 6.46 m (21.2 ft) west of 2 birch trees with the NW tree being 0.25 m (0.8 ft) in diameter and the SE tree being 0.15 m (0.5 ft) in diameter, 6.41 m (21.0 ft) SE of a 0.25 m (0.8 ft) diameter birch tree, and 3.62 m (11.9 ft) south of the start of a 9 m (30 ft) high alder and birch tree covered bluff. The bench mark is set 14 cm (0.5 ft) above grade, crimped to a copper rod driven to an unspecified depth.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 7 Station ID: 9455963 PUBLICATION DATE: 12/05/2013 Name: GOOSE CREEK KNIK ARM, COOK INLET AK NOAA Chart: 16660 Latitude: 61° 23.6' N ( 61.39330) USGS Quad: ANCHORAGE B-8 NW Longitude: 149° 50.8' W (-149.84700) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 5963 A 2013 DESIGNATION: 945 5963 A MONUMENTATION: Metal Rod VM#: 20882 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod with sleeve OPUS PID#: BBDG16 LATITUDE: 61° 23.5' N ( 61.39211) LONGITUDE: 149° 50.8' W (-149.84603) The bench mark is a flange encased rod located at the east end of a small gravel parking area directly south of the Goose Bay Airstrip, 51.41 m (168.7 ft) ESE of the center of the round-about in the gravel parking lot, 13.55 m (44.5 ft) west of the start of a 9 m (30 ft) alder-covered bluff, 11.14 m (36.5 ft) sloped distance SSW of the top of the alder-covered bluff, and 7.43 m (24.4 ft) north of the top of a 6 m (20 ft) high bluff that slopes down to Goose Bay. The datum point is set 6 cm (0.2 ft) below grade, being the top of a stainless steel rod driven 4.5 m (15 ft) to refusal, and encased in a 5-inch NOS logo cover.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 7 Station ID: 9455963 PUBLICATION DATE: 12/05/2013 Name: GOOSE CREEK KNIK ARM, COOK INLET AK NOAA Chart: 16660 Latitude: 61° 23.6' N ( 61.39330) USGS Quad: ANCHORAGE B-8 NW Longitude: 149° 50.8' W (-149.84700) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 5963 B 2013 DESIGNATION: 945 5963 B MONUMENTATION: Metal Rod VM#: 20883 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod with sleeve OPUS PID: LATITUDE: 61° 23.6' N ( 61.39317) LONGITUDE: 149° 51.0' W (-149.84931) The bench mark is a flange encased rod located along the unnamed gravel road leading to a small gravel parking area directly south of the Goose Bay Airstrip, 23.88 m (78.3 ft) NNW of a 0.16 m (0.5 ft) diameter birch tree, 7.16 m (23.5 ft) west of the centerline of the unnamed gravel road, 4.57 m (15.0 ft) SSE of a clump of birch trees consisting of one 0.20 m (0.7 ft) in diameter and the other 0.25 m (0.8 ft) in diameter, and 3.04 m (10.0 ft) NE of the alder vegetation line. The datum point is set 11 cm (0.4 ft) below grade, being the top of a stainless steel rod driven 5.4 m (18 ft) to refusal, and encased in a 5-inch NOS logo cover.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 7 Station ID: 9455963 PUBLICATION DATE: 12/05/2013 Name: GOOSE CREEK KNIK ARM, COOK INLET AK NOAA Chart: 16660 Latitude: 61° 23.6' N ( 61.39330) USGS Quad: ANCHORAGE B-8 NW Longitude: 149° 50.8' W (-149.84700) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 5963 C 2013 DESIGNATION: 945 5963 C MONUMENTATION: Metal Rod VM#: 20884 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod with sleeve OPUS PID: LATITUDE: 61° 23.6' N ( 61.39383) LONGITUDE: 149° 50.9' W (-149.84889) The bench mark is a flange encased rod located along the unnamed gravel road leading to a small gravel parking area directly south of the Goose Bay Airstrip, 78 m (256 ft) NNE of tidal bench mark 945 5963 B, 14.09 m (46.2 ft) WNW of the centerline of the unnamed gravel road that runs north-south, 8.12 m (26.6 ft) north of a clump of five birch trees that are all 0.25 m (0.8 ft) in diameter, 7.56 m (24.8 ft) SSW of the centerline of the unnamed gravel road that runs east-west, and 6.38 m (20.9 ft) NE of a 0.25 m (0.8 ft) diameter birch tree. The datum point is set 8 cm (0.3 ft) below grade, being the top of a stainless steel rod driven 6.0 m (20 ft) to refusal, and encased in a 5-inch NOS logo cover.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 7 Station ID: 9455963 PUBLICATION DATE: 12/05/2013 Name: GOOSE CREEK KNIK ARM, COOK INLET AK NOAA Chart: 16660 Latitude: 61° 23.6' N ( 61.39330) USGS Quad: ANCHORAGE B-8 NW Longitude: 149° 50.8' W (-149.84700) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 5963 D 2013 DESIGNATION: 945 5963 D MONUMENTATION: Metal Rod VM#: 20885 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod with sleeve OPUS PID: LATITUDE: 61° 23.6' N ( 61.39389) LONGITUDE: 149° 50.1' W (-149.83469) The bench mark is a flange encased rod located along the unnamed gravel road leading to a small gravel parking area directly south of the Goose Bay airport, 132 m (433 ft) west of tidal bench mark 945 5963 C, 14.73 m (48.3 ft) NNE of a 0.34 m (1.1 ft) diameter birch tree, 13.30 m (43.6 ft) WSW of a clump of four birch trees that are all 0.10 m (0.3 ft) in diameter, 12.39 m (40.6 ft) ESE of a 0.17 m (0.6 ft) diameter birch tree, and 8.65 m (28.4 ft) south of the centerline of the unnamed gravel road. The datum point is set 4 cm (0.1 ft) below grade, being the top of a stainless steel rod driven 12.7 m (42 ft) to refusal, and encased in a 5-inch NOS logo cover.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 7 Station ID: 9455963 PUBLICATION DATE: 12/05/2013 Name: GOOSE CREEK KNIK ARM, COOK INLET AK NOAA Chart: 16660 Latitude: 61° 23.6' N ( 61.39330) USGS Quad: ANCHORAGE B-8 NW Longitude: 149° 50.8' W (-149.84700) T I D A L D A T U M S Tidal datums at GOOSE CREEK KNIK ARM, COOK INLET based on: LENGTH OF SERIES: 30 Days TIME PERIOD: July 3 2013 - August 1 2013 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 9455920 ANCHORAGE, KNIK ARM, COOK INLET Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 9.456 MEAN HIGH WATER MHW = 9.225 MEAN SEA LEVEL MSL = 5.386 MEAN TIDE LEVEL MTL = 4.953 MEAN LOW WATER MLW = 0.681 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW TIDAL BM 4 1975 17.587 8.362 5963 A 2013 14.695 5.471 5963 B 2013 26.677 17.452 5963 C 2013 27.663 18.439 5963 D 2013 28.196 18.971
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 7 Station ID: 9455963 PUBLICATION DATE: 12/05/2013 Name: GOOSE CREEK KNIK ARM, COOK INLET AK NOAA Chart: 16660 Latitude: 61° 23.6' N ( 61.39330) USGS Quad: ANCHORAGE B-8 NW Longitude: 149° 50.8' W (-149.84700) 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.