U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 7 Station ID: 9410079 PUBLICATION DATE: 07/27/2017 Name: AVALON, SANTA CATALINA ISLAND CA NOAA Chart: 18757 Latitude: 33° 20.7' N ( 33.34500) USGS Quad: SANTA CATALINA EAST Longitude: 118° 19.5' W (-118.32500) To reach the tide station from the Avalon ferry terminal on Pebbly Beach Road, proceed 0.26 km (0.16 mi) SW on Pebbly Beach Road to the intersection with Crescent Ave, turn right on Crescent Avenue and proceed 0.15 km (0.1 mi) WNW on Crescent Ave along the waterfront to the intersection with Catalina Avenue at the base of the Green Pier. The tide station is on Green Pier and the bench marks are along the waterfront. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 0079 A 2017 DESIGNATION: 941 0079 A MONUMENTATION: Bench Mark disk VM#: 22200 AGENCY: National Ocean Service IDB PID#: SETTING CLASSIFICATION: OPUS PID: LATITUDE: 33° 20.6' N ( 33.34347) LONGITUDE: 118° 19.4' W (-118.32283) The primary bench mark is a disk set in bed rock outcrop at the base of a rock cliff on east side of pebbly beach road, 13.47 m (44.2 ft) ESE of the centerline of road, 11.04 m (36.2 ft) east of light pole, 8.62 m (28.3 ft) south of the north corner of concrete retaining wall, 6.20 m (20.3 ft) NW of opening of cave, 5.02 m (16.5 ft) ESE of southern most palm tree of three, 4.10 m (13.5 ft) east of the south corner of cement retaining wall and approximately 2.5 m (8.2 ft) above the road.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 7 Station ID: 9410079 PUBLICATION DATE: 07/27/2017 Name: AVALON, SANTA CATALINA ISLAND CA NOAA Chart: 18757 Latitude: 33° 20.7' N ( 33.34500) USGS Quad: SANTA CATALINA EAST Longitude: 118° 19.5' W (-118.32500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: TIDAL 5 1975 DESIGNATION: TIDAL 5 1975 MONUMENTATION: Bench Mark disk VM#: 15680 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Set in a concrete rectangle OPUS PID: LATITUDE: 33° 20.6' N ( 33.34281) LONGITUDE: 118° 19.5' W (-118.32447) The bench mark is a disk set in concrete sidewalk at SE corner of intersection of Crescent and Clarissa Ave, 3.15 m (10.3 ft) SW of water valve cover in street, 1.97 m (6.5 ft) SW of water cover in paver sidewalk, 1.92 m (6.3 ft) SW of building corner, 0.36 m (1.2 ft) SE of edge of curb for Clarissa Avenue, and 0.26 m (0.9 ft) SSW of wooden sign post. BENCH MARK STAMPING: 0079 B 2017 DESIGNATION: 941 0079 B MONUMENTATION: Bench Mark disk VM#: 22201 AGENCY: National Ocean Service IDB PID#: SETTING CLASSIFICATION: Concrete stairway OPUS PID: LATITUDE: 33° 20.5' N ( 33.34233) LONGITUDE: 118° 19.4' W (-118.32344) The bench mark is a disk set in middle landing of concrete stairs, 7.82 m (25.7 ft) north of power pole 1492372e, 6.87 m (22.5 ft) SE of light post, 4.39 m (14.4 ft) NW of top of stairs, 4.10 m (13.5 ft) SE of bottom of stairs, 2.12 m (7.0 ft) west of palm tree, and 0.2 m (0.7 ft) SSW of concrete and stone railing.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 7 Station ID: 9410079 PUBLICATION DATE: 07/27/2017 Name: AVALON, SANTA CATALINA ISLAND CA NOAA Chart: 18757 Latitude: 33° 20.7' N ( 33.34500) USGS Quad: SANTA CATALINA EAST Longitude: 118° 19.5' W (-118.32500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 0079 C 2017 DESIGNATION: 941 0079 C MONUMENTATION: Bench Mark disk VM#: 22202 AGENCY: National Ocean Service IDB PID#: SETTING CLASSIFICATION: Concrete seawall OPUS PID: LATITUDE: 33° 20.6' N ( 33.34339) LONGITUDE: 118° 19.5' W (-118.32503) The bench mark is a disk set in top of concrete seawall, 11.51 m (37.8 ft) west of second set of stairs SE of pier through seawall to water, 2.6 m (8.5 ft) NW of palm tree, 1.96 m (6.4 ft) ESE of the pier, 1.48 m (4.9 ft) ESE of center of stairs to water adjacent to pier, and 0.39 m (1.3 ft) above beach. BENCH MARK STAMPING: 0079 D 2017 DESIGNATION: 941 0079 D MONUMENTATION: Bench Mark disk VM#: 22203 AGENCY: National Ocean Service IDB PID#: SETTING CLASSIFICATION: Concrete seawall OPUS PID#: BBFL78 LATITUDE: 33° 20.7' N ( 33.34497) LONGITUDE: 118° 19.6' W (-118.32656) The bench mark is a disk set in a concrete seawall just north of a stone plaza, 41.1 m (134.8 ft) ESE of SE corner of Via Casino Arch over water front walkway, 33.45 m (109.7 ft) SE of stairs down to water, 9.54 m (31.3 ft) NE of concrete wall at top of beach, and 2.32 m (7.6 ft) NW of higher sea wall.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 7 Station ID: 9410079 PUBLICATION DATE: 07/27/2017 Name: AVALON, SANTA CATALINA ISLAND CA NOAA Chart: 18757 Latitude: 33° 20.7' N ( 33.34500) USGS Quad: SANTA CATALINA EAST Longitude: 118° 19.5' W (-118.32500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 0079 E 2017 DESIGNATION: 941 0079 E MONUMENTATION: Bench Mark disk VM#: 22204 AGENCY: National Ocean Service IDB PID#: SETTING CLASSIFICATION: Concrete headwall for culvert OPUS PID: LATITUDE: 33° 20.4' N ( 33.34047) LONGITUDE: 118° 19.7' W (-118.32858) The bench mark is a disk set in concrete headwall for a culvert near the SE corner of the intersection for Avalon Cyn Rd and Tremont St, 17.25 m (56.6 ft) south of SE corner of building at 410 Tremont St, 11.59 m (38.0 ft) east of manhole, 9.65 m (31.7 ft) south of the centerline of Tremont St, 4.74 m (15.6 ft) south of tree, 4.74 m (15.6 ft) SE of curb along Avalon Cyn Rd, and 1.46 m (4.8 ft) north of chain link fence.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 7 Station ID: 9410079 PUBLICATION DATE: 07/27/2017 Name: AVALON, SANTA CATALINA ISLAND CA NOAA Chart: 18757 Latitude: 33° 20.7' N ( 33.34500) USGS Quad: SANTA CATALINA EAST Longitude: 118° 19.5' W (-118.32500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 1 RESET 1968 DESIGNATION: TIDAL 1 RESET 1968 MONUMENTATION: Bench Mark disk VM#: 22205 AGENCY: US Coast & Geodetic Survey IDB PID#: SETTING CLASSIFICATION: Curb OPUS PID: LATITUDE: 33° 20.6' N ( 33.34269) LONGITUDE: 118° 19.4' W (-118.32383) The bench mark is a disk set in a section of curb inside of circular traffic island in intersection of Pebbly Beach Road and Crescent Avenue, 11.68 m (38.3 ft) NNE of corner of Catalina Island cart rentals building, 2.12 m (7.0 ft) south of palm tree, 1.99 m (6.5 ft) WNW of light pole, 1.97 m (6.5 ft) NNE of sewer manhole, and 1.05 m (3.4 ft) WSW of closest edge of well cover.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 7 Station ID: 9410079 PUBLICATION DATE: 07/27/2017 Name: AVALON, SANTA CATALINA ISLAND CA NOAA Chart: 18757 Latitude: 33° 20.7' N ( 33.34500) USGS Quad: SANTA CATALINA EAST Longitude: 118° 19.5' W (-118.32500) T I D A L D A T U M S Tidal datums at AVALON, SANTA CATALINA ISLAND based on: LENGTH OF SERIES: 3 MONTHS TIME PERIOD: February 2017 - April 2017 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 9410660 LOS ANGELES, OUTER HARBOR Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 1.628 MEAN HIGH WATER MHW = 1.400 MEAN TIDE LEVEL MTL = 0.836 MEAN SEA LEVEL MSL = 0.831 MEAN LOW WATER MLW = 0.271 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 0079 A 2017 6.325 4.925 TIDAL 5 1975 3.139 1.739 0079 B 2017 9.903 8.503 0079 C 2017 3.077 1.677 0079 D 2017 2.768 1.368 0079 E 2017 12.266 10.866 1 RESET 1968 3.822 2.422
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 7 Station ID: 9410079 PUBLICATION DATE: 07/27/2017 Name: AVALON, SANTA CATALINA ISLAND CA NOAA Chart: 18757 Latitude: 33° 20.7' N ( 33.34500) USGS Quad: SANTA CATALINA EAST Longitude: 118° 19.5' W (-118.32500) 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.