U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 9 Station ID: 9455777 PUBLICATION DATE: 08/22/2018 Name: BOULDER POINT AK NOAA Chart: 16663 Latitude: 60° 46.6' N ( 60.77670) USGS Quad: FALSE PASS D-5 Longitude: 151° 14.7' W (-151.24500) This tertiary tide station is located 0.6 mile east of Boulder Point, on the east side of Cook Inlet on the Kenai Peninsula. The station is about 13.5 miles NNW of the airport in Kenai, 48 miles SW of the Anchorage International Airport, and 3 miles NE of Arness Dock. The station was reached using an ATV from the Arness Dock access road, and several other access tracks to the beach which take off from the Nikiski to Captain Cook paved road. ATV access is dependent on the tides. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 5777 E 1998 DESIGNATION: 945 5777 E MONUMENTATION: Tidal Station disk VM#: 16068 AGENCY: LCMF, Inc. IDB PID#: SETTING CLASSIFICATION: Boulder OPUS PID: LATITUDE: 60° 46.6' N ( 60.77670) LONGITUDE: 151° 14.7' W (-151.24500) The bench mark is a disk set on the top of a 4 m x 2 m x 1 m (14 ft x 8 ft x 4 ft) high boulder, 74 m (242 ft) west of bench mark 5777 C 1998, and 21 m (68 ft) from the base of the bluff.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 9 Station ID: 9455777 PUBLICATION DATE: 08/22/2018 Name: BOULDER POINT AK NOAA Chart: 16663 Latitude: 60° 46.6' N ( 60.77670) USGS Quad: FALSE PASS D-5 Longitude: 151° 14.7' W (-151.24500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 5777 C 1998 DESIGNATION: 945 5777 C MONUMENTATION: Tidal Station disk VM#: 16066 AGENCY: LCMF, Inc. IDB PID#: SETTING CLASSIFICATION: Boulder OPUS PID: LATITUDE: 60° 46.6' N ( 60.77670) LONGITUDE: 151° 14.7' W (-151.24500) The bench mark is a disk set on the top of a 2 m x 2 m x 1 m (6 ft x 8 ft x 4 ft) high boulder, 90 m (295 ft) WSW of bench mark 5869 D 1998, 74 m (242 ft) east of bench mark 5869 E 1998, 15 m (50 ft) from the base of the bluff. BENCH MARK STAMPING: 5777 D 1998 DESIGNATION: 945 5777 D MONUMENTATION: Tidal Station disk VM#: 16067 AGENCY: LCMF, Inc. IDB PID#: SETTING CLASSIFICATION: Boulder OPUS PID: LATITUDE: 60° 46.6' N ( 60.77670) LONGITUDE: 151° 14.7' W (-151.24500) The bench mark is a disk set on the top of a 2 m x 4 m x 1 m (6 ft x 13 ft x 4 ft) high boulder, 90 m (295 ft) ENE of bench mark 5777 C 1998, 24 m (78 ft) NE of bench mark 5777 D 1998, and 15 m (48 ft) from the base of the bluff.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 9 Station ID: 9455777 PUBLICATION DATE: 08/22/2018 Name: BOULDER POINT AK NOAA Chart: 16663 Latitude: 60° 46.6' N ( 60.77670) USGS Quad: FALSE PASS D-5 Longitude: 151° 14.7' W (-151.24500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: F DESIGNATION: 945 5777 F MONUMENTATION: Bolt VM#: 16069 AGENCY: LCMF, Inc. IDB PID#: SETTING CLASSIFICATION: Boulder OPUS PID: LATITUDE: 60° 46.6' N ( 60.77670) LONGITUDE: 151° 14.7' W (-151.24500) The bench mark is a 1/2 inch diameter stainless steel bolt with hex head set horizontally on the SE side of a 5 m x 6 m x 2 m (17 ft x 20 ft x 8 ft) high boulder which is suspended 1 m (3 ft) beneath the SE corner by a small boulder, 51 m (167 ft) NNE of bench mark 5777 H 1998, 35 m (116 ft) from the base of the bluff, 9 m (30 ft) south of bench mark 5777 G 1998, and 1 m (3 ft) above beach level. BENCH MARK STAMPING: 5777 G 1998 DESIGNATION: 945 5777 G MONUMENTATION: Tidal Station disk VM#: 16070 AGENCY: LCMF, Inc. IDB PID#: SETTING CLASSIFICATION: Boulder OPUS PID: LATITUDE: 60° 46.6' N ( 60.77670) LONGITUDE: 151° 14.7' W (-151.24500) The bench mark is a disk set on the top of a 6 m x 7 m x 2 m (20 ft x 22 ft x 8 ft) high boulder, 52 m (170 ft) NW of bench mark J, 49 m (160 ft) from the base of the bluff, and 9 m (30 ft) north of bench mark F.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 9 Station ID: 9455777 PUBLICATION DATE: 08/22/2018 Name: BOULDER POINT AK NOAA Chart: 16663 Latitude: 60° 46.6' N ( 60.77670) USGS Quad: FALSE PASS D-5 Longitude: 151° 14.7' W (-151.24500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 5777 H 1998 DESIGNATION: 945 5777 H MONUMENTATION: Tidal Station disk VM#: 16071 AGENCY: LCMF, Inc. IDB PID#: SETTING CLASSIFICATION: Boulder OPUS PID: LATITUDE: 60° 46.6' N ( 60.77670) LONGITUDE: 151° 14.7' W (-151.24500) The bench mark is a disk set on the top of a 3 m x 3 m x 1 m (9 ft x 9 ft x 4 ft) high boulder, 77 m (252 ft) WSW of bench mark J, 51 m (167 ft) SW of bench mark F, and 30 m (100 ft) from the base of the bluff. BENCH MARK STAMPING: J DESIGNATION: 945 5777 J MONUMENTATION: Bolt VM#: 16072 AGENCY: LCMF, Inc. IDB PID#: SETTING CLASSIFICATION: Boulder OPUS PID: LATITUDE: 60° 46.6' N ( 60.77670) LONGITUDE: 151° 14.7' W (-151.24500) The bench mark is a 1/2 inch diameter bolt with hex head set horizontally on the southwest face of a 2 m x 3 m x 2 m (8 ft x 10 ft x 6 ft) high boulder, 77 m (252 ft) ENE of bench mark 5777 H 1998, 15 m (50 ft) SW of bench mark 5777 E 1998, and 9 m (30 ft) from the base of the bluff.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 9 Station ID: 9455777 PUBLICATION DATE: 08/22/2018 Name: BOULDER POINT AK NOAA Chart: 16663 Latitude: 60° 46.6' N ( 60.77670) USGS Quad: FALSE PASS D-5 Longitude: 151° 14.7' W (-151.24500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: K DESIGNATION: 945 5777 K MONUMENTATION: Bolt VM#: 16073 AGENCY: LCMF, Inc. IDB PID#: SETTING CLASSIFICATION: Boulder OPUS PID: LATITUDE: 60° 46.6' N ( 60.77670) LONGITUDE: 151° 14.7' W (-151.24500) The bench mark is a 1/2 inch diameter stainless steel machine bolt with hex head set horizontally on the southwestern face of a 6 m x 8 m x 2 m (20 ft x 25 ft x 8 ft) high boulder on which bench mark 5777 G 1998 is set, 47 m (155 ft) from the base of the bluff, 8 m (27 ft) north of bench mark F, and 3 m (10 ft) SE of bench mark 5777 G 1998. BENCH MARK STAMPING: L DESIGNATION: 945 5777 L MONUMENTATION: Bolt VM#: 16074 AGENCY: LCMF, Inc. IDB PID#: SETTING CLASSIFICATION: Boulder OPUS PID: LATITUDE: 60° 46.6' N ( 60.77670) LONGITUDE: 151° 14.7' W (-151.24500) The bench mark is a 1/2 inch diameter stainless steel machine bolt with hex head set horizontally on the southeastern face of a 4 m x 5 m x 3 m (14 ft x 15 ft x 11 ft) high boulder, 61 m (200 ft) NE of bench mark 5777 H 1998, 46 m (150 ft) west of bench mark 5777 E 1998, 35 m (115 ft) from the base of the bluff, and 1 m (2 ft) above beach level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 9 Station ID: 9455777 PUBLICATION DATE: 08/22/2018 Name: BOULDER POINT AK NOAA Chart: 16663 Latitude: 60° 46.6' N ( 60.77670) USGS Quad: FALSE PASS D-5 Longitude: 151° 14.7' W (-151.24500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 5777 M 1999 DESIGNATION: 945 5777 M MONUMENTATION: Tidal Station disk VM#: 16075 AGENCY: LCMF, Inc. IDB PID#: SETTING CLASSIFICATION: Boulder OPUS PID: LATITUDE: 60° 46.6' N ( 60.77670) LONGITUDE: 151° 14.7' W (-151.24500) The bench mark is a disk set on the top of a 1 m x 2 m (4 ft x 5 ft) boulder, 69 m (225 ft) east of bench mark 5777 H 1998, 30 m (97 ft) SW of bench mark 5777 E 1998, 3 m (10 ft) south of brush line at high water, 1 m (2 ft) NE of a 1/2 inch diameter rebar set vertically in the same boulder, and 0.3 m (1 ft) above the ground. BENCH MARK STAMPING: 5777 N 1999 DESIGNATION: 945 5777 N MONUMENTATION: Tidal Station disk VM#: 16076 AGENCY: LCMF, Inc. IDB PID#: SETTING CLASSIFICATION: Boulder OPUS PID: LATITUDE: 60° 46.6' N ( 60.77670) LONGITUDE: 151° 14.7' W (-151.24500) The bench mark is a disk set on the top of a 3 m x 4 m x 1 m (9 ft x 13 ft x 2 ft) high flat topped boulder, 66 m (215 ft) east of bench mark 5777 C 1998, 24 m (78 ft) WSW of bench mark 5777 D 1998, 21 m (68 ft) from the base of the bluff, and 1 m (4 ft) ESE of bench mark P in the same boulder.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 9 Station ID: 9455777 PUBLICATION DATE: 08/22/2018 Name: BOULDER POINT AK NOAA Chart: 16663 Latitude: 60° 46.6' N ( 60.77670) USGS Quad: FALSE PASS D-5 Longitude: 151° 14.7' W (-151.24500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: P DESIGNATION: 945 5777 P MONUMENTATION: Bolt VM#: 16077 AGENCY: LCMF, Inc. IDB PID#: SETTING CLASSIFICATION: Boulder OPUS PID: LATITUDE: 60° 46.6' N ( 60.77670) LONGITUDE: 151° 14.7' W (-151.24500) The bench mark is a 1/2 inch diameter stainless steel machine bolt with hex head set on the top of a 3 m x 4 m x 1 m (9 ft x 13 ft x 2 ft) high flat topped boulder, 66 m (215 ft) east of bench mark 5777 C 1998, 24 m (78 ft) WSW of bench mark 5777 D 1998, 21 m (68 ft) from the base of the bluff, and 1 m (4 ft) WNW of bench mark 5777 N 1999 in the same boulder.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 8 of 9 Station ID: 9455777 PUBLICATION DATE: 08/22/2018 Name: BOULDER POINT AK NOAA Chart: 16663 Latitude: 60° 46.6' N ( 60.77670) USGS Quad: FALSE PASS D-5 Longitude: 151° 14.7' W (-151.24500) T I D A L D A T U M S Tidal datums at BOULDER POINT based on: LENGTH OF SERIES: 30 DAYS TIME PERIOD: Aug 14 1999 - Sep 12 1999 TIDAL EPOCH: 2012-2016 CONTROL TIDE STATION: 9455760 NIKISKI, COOK INLET Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 6.416 MEAN HIGH WATER MHW = 6.202 MEAN SEA LEVEL MSL = 3.514 MEAN TIDE LEVEL MTL = 3.433 MEAN LOW WATER MLW = 0.664 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 5777 E 1998 6.267 0.064 5777 C 1998 6.945 0.743 5777 D 1998 5.590 -0.612 F 4.486 -1.716 5777 G 1998 4.917 -1.285 5777 H 1998 5.900 -0.303 J 6.832 0.629 K 3.715 -2.487 L 4.111 -2.091 5777 M 1999 10.087 3.884 5777 N 1999 5.536 -0.667 P 5.609 -0.593
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 9 of 9 Station ID: 9455777 PUBLICATION DATE: 08/22/2018 Name: BOULDER POINT AK NOAA Chart: 16663 Latitude: 60° 46.6' N ( 60.77670) USGS Quad: FALSE PASS D-5 Longitude: 151° 14.7' W (-151.24500) 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.