U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 Station ID: 9465601 PUBLICATION DATE: 01/12/2012 Name: CARTER BAY, KUSKOKWIM BAY AK NOAA Chart: 16300 Latitude: 59° 22.7' N ( 59.37802) USGS Quad: GOODNEWS BAY B-8 Longitude: 162° 1.8' W (-162.02933) To reach the tidal bench marks from the Quinhagak boat harbor, proceed west 3.7 km (2.3 mi) by boat down the Kanektok River to the Kuskokwim Bay at high tide, then south 46.4 km (28.8 mi) along the coastline past Jacksmith Bay to the rusty remains of an old barge at the top of the shoreline near the head of Carter Bay. The bench marks are about 50 m (15 ft) from the top of the bluff and run in a north/south orientation parallel to the coast. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 5601 A 2011 DESIGNATION: 946 5601 A MONUMENTATION: Metal Rod VM#: 20205 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID#: BBCK45 LATITUDE: 59° 21.6' N ( 59.35917) LONGITUDE: 161° 57.3' W (-161.95497) The primary bench mark is a metal rod set in tundra between the coast of Carter Bay and a tide slough, 91.61 m (300.6 ft) west of a 1.50 m (4.9 ft) high grass bank by the tide slough, 72.70 m (238.5 ft) south of bench mark 946 5601 B, and 27.61 m (90.6 ft) east of where the tundra turns into grass near the coast. The datum point is set 5 cm (0.2 ft) below grade, being the top of a stainless steel rod driven 14.6 m (48 ft) to refusal, and encased in a 6-inch PVC pipe with an NOS logo cover.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 Station ID: 9465601 PUBLICATION DATE: 01/12/2012 Name: CARTER BAY, KUSKOKWIM BAY AK NOAA Chart: 16300 Latitude: 59° 22.7' N ( 59.37802) USGS Quad: GOODNEWS BAY B-8 Longitude: 162° 1.8' W (-162.02933) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 5601 B 2011 DESIGNATION: 946 5601 B MONUMENTATION: Metal Rod VM#: 20206 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 59° 21.6' N ( 59.35983) LONGITUDE: 161° 57.3' W (-161.95503) The bench mark is a metal rod set in tundra between the coast of Carter Bay and a tide slough, 87.35 m (286.6 ft) west of where the tundra turns into grass near the tide slough, 72.70 m (238.5 ft) north of bench mark 946 5601 A, and 28.92 m (94.9 ft) east of a sparse transition from tundra to gravel and grass near the coast. The datum point is set 6 cm (0.2 ft) below grade, being the top of a stainless steel rod driven 14.6 m (48 ft) to refusal, and encased in a 6-inch PVC pipe with an NOS logo cover. BENCH MARK STAMPING: 5601 C 2011 DESIGNATION: 946 5601 C MONUMENTATION: Metal Rod VM#: 20207 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 59° 21.6' N ( 59.36044) LONGITUDE: 161° 57.3' W (-161.95486) The bench mark is a metal rod set in tundra between the coast of Carter Bay and a tide slough, 99.91 m (327.8 ft) north of bench mark 946 5601 B, 83.21 m (273.0 ft) west of where the tundra turns into grass near the tide slough, and 37.99 m (124.6 ft) east of where the tundra turns into grass near the coast. The datum point is set 2 cm (0.1 ft) below grade, being the top of a stainless steel rod driven 14.5 m (48 ft) to refusal, and encased in a 6-inch PVC pipe with an NOS logo cover.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 Station ID: 9465601 PUBLICATION DATE: 01/12/2012 Name: CARTER BAY, KUSKOKWIM BAY AK NOAA Chart: 16300 Latitude: 59° 22.7' N ( 59.37802) USGS Quad: GOODNEWS BAY B-8 Longitude: 162° 1.8' W (-162.02933) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 5601 D 2011 DESIGNATION: 946 5601 D MONUMENTATION: Metal Rod VM#: 20208 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 59° 21.7' N ( 59.36108) LONGITUDE: 161° 57.3' W (-161.95489) The bench mark is a metal rod set in tundra between the coast of Carter Bay and a tide slough, 91.75 m (301.0 ft) west of where the tundra turns into thick grass near the tide slough, 72.55 m (238.0 ft) SSW of bench mark 946 5601 E, and 71.95 m (236.0 ft) NNW of bench mark 946 5601 C. The datum point is set 3 cm (0.1 ft) below grade, being the top of a stainless steel rod driven 14.5 m (48 ft) to refusal, and encased in a 6-inch PVC pipe with an NOS logo cover. BENCH MARK STAMPING: 5601 E 2011 DESIGNATION: 946 5601 E MONUMENTATION: Metal Rod VM#: 20209 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 59° 21.7' N ( 59.36167) LONGITUDE: 161° 57.3' W (-161.95431) The bench mark is a metal rod set in tundra between the coast of Carter Bay and a tide slough, 136.99 m (449.4 ft) SW of a berry picking camp 14.00 m (45.9 ft) west of the edge of the tide slough, 94.41 m (309.7 ft) ENE of the center point of the northern most piece of a 1.56 m x 1.46 m x 0.85 m (5.1 ft x 4.8 ft x 2.8 ft) high section of rusty barge debris, 72.55 m (238.0 ft) NNE of bench mark 946 5601 D, and 66.35 m (217.7 ft) west of where the tundra turns into thick grass near the tide slough. The datum point is set 5 cm (0.2 ft) below grade, being the top of a stainless steel rod driven 14.5 m (48 ft) to refusal, and encased in a 6-inch PVC pipe with an NOS logo cover.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 Station ID: 9465601 PUBLICATION DATE: 01/12/2012 Name: CARTER BAY, KUSKOKWIM BAY AK NOAA Chart: 16300 Latitude: 59° 22.7' N ( 59.37802) USGS Quad: GOODNEWS BAY B-8 Longitude: 162° 1.8' W (-162.02933) T I D A L D A T U M S Tidal datums at CARTER BAY, KUSKOKWIM BAY based on: LENGTH OF SERIES: 3 MONTHS TIME PERIOD: June 2011 - August 2011 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 3.255 MEAN HIGH WATER MHW = 2.541 MEAN SEA LEVEL MSL = 1.432 MEAN TIDE LEVEL MTL = 1.372 MEAN LOW WATER MLW = 0.202 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 5601 A 2011 6.084 3.543 5601 B 2011 6.021 3.480 5601 C 2011 5.995 3.454 5601 D 2011 6.478 3.937 5601 E 2011 6.138 3.597
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 Station ID: 9465601 PUBLICATION DATE: 01/12/2012 Name: CARTER BAY, KUSKOKWIM BAY AK NOAA Chart: 16300 Latitude: 59° 22.7' N ( 59.37802) USGS Quad: GOODNEWS BAY B-8 Longitude: 162° 1.8' W (-162.02933) 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.