U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 6 Station ID: 9411399 PUBLICATION DATE: 05/10/2013 Name: GAVIOTA STATE PARK, PACIFIC OCEAN CA NOAA Chart: 18721 Latitude: 34° 28.2' N ( 34.46939) USGS Quad: GAVIOTA Longitude: 120° 13.7' W (-120.22831) To reach the station from the intersection of Highways 1 and 101 29 km (18 mi) SE of Lompoc, proceed southerly on Highway 101 for 3.9 km (2.4 mi) to the intersection with Gaviota Beach Road, turn right on Gaviota Beach Road and proceed south 0.5 km (0.3 mi) to the Gaviota State Park entrance, continue 0.2 km (0.1 mi) south into the parking lot, park and continue SW on foot beneath a train trestle along the paved road 0.1 km (0.06 mi) to the wooden pier. The benchmarks are located throughout the parking area and along an abandoned highway to the north near Highway 101. The tide gauge is located 130 m (425 ft) from the base of the pier. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 1399 A 2012 DESIGNATION: 941 1399 A MONUMENTATION: Tidal Station disk VM#: 20623 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete base of pier OPUS PID#: BBCW94 LATITUDE: 34° 28.3' N ( 34.47089) LONGITUDE: 120° 13.7' W (-120.22868) The primary bench mark is a disk set in a 0.58 m (1.9 ft) thick concrete slab on top of bedrock at the base of the Gaviota State Park pier, 33.89 m (111.2 ft) SW from the north end of the metal railing on the east side of the path near the trestle, 9.95 m (32.6 ft) WNW from the NE corner of the wooden pier, 4.21 m (13.8 ft) NW from the NW corner of the wooden pier, 0.15 m (0.5 ft) NE of the concrete edge, and 0.14 m (0.5 ft) WSW from the metal railing.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 6 Station ID: 9411399 PUBLICATION DATE: 05/10/2013 Name: GAVIOTA STATE PARK, PACIFIC OCEAN CA NOAA Chart: 18721 Latitude: 34° 28.2' N ( 34.46939) USGS Quad: GAVIOTA Longitude: 120° 13.7' W (-120.22831) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 1399 B 2012 DESIGNATION: 941 1399 B MONUMENTATION: Tidal Station disk VM#: 20624 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete curb OPUS PID: LATITUDE: 34° 28.3' N ( 34.47186) LONGITUDE: 120° 13.7' W (-120.22833) The bench mark is a disk set in a concrete curb adjacent to the storage building for the Gaviota Beach Store, 52.35 m (171.8 ft) NNW of the fourth support east of the west end of the train trestle, 29.05 m (95.3 ft) east of a metal light pole, 4.75 m (15.6 ft) SE of a stop sign, 0.27 m (0.9 ft) WSW from the SW corner of the storage building and 0.18 m (0.6 ft) above the asphalt parking lot. BENCH MARK STAMPING: 1399 C 2012 DESIGNATION: 941 1399 C MONUMENTATION: Tidal Station disk VM#: 20625 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete curb OPUS PID: LATITUDE: 34° 28.4' N ( 34.47300) LONGITUDE: 120° 13.8' W (-120.22942) The bench mark is a disk set in the concrete curb to the entrance kiosk for the Gaviota State Beach Park, 41.35 m (135.7 ft) NW of the NW corner of the shower building, 37.81 m (124.0 ft) south of the centerline of the entrance gate to the park, 10.06 m (33.0 ft) ESE of a stop sign on the west side of the road at the kiosk, 3.92 m (12.9 ft) south of the SW corner of the kiosk and 0.06 m (0.2 ft) above the asphalt road.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 6 Station ID: 9411399 PUBLICATION DATE: 05/10/2013 Name: GAVIOTA STATE PARK, PACIFIC OCEAN CA NOAA Chart: 18721 Latitude: 34° 28.2' N ( 34.46939) USGS Quad: GAVIOTA Longitude: 120° 13.7' W (-120.22831) T I D A L B E N C H M A R K S BENCH MARK STAMPING: R 27 RESET 1957 DESIGNATION: R 27 RESET MONUMENTATION: Survey disk VM#: 20626 AGENCY: CA State Lands Commission IDB PID#: DZ0047 SETTING CLASSIFICATION: Bridge abutment OPUS PID: LATITUDE: 34° 28.3' N ( 34.47133) LONGITUDE: 120° 13.7' W (-120.22861) The bench mark is a disk set on the top of the bridge abutment at the west end of the railroad trestle over Gaviota State Park, 12.09 m (39.7 ft) east of a No Trespassing sign, 2.71 m (8.9 ft) north of the south end of the stone abutment and 0.63 m (2.1 ft) south of the wooden side of the bridge.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 6 Station ID: 9411399 PUBLICATION DATE: 05/10/2013 Name: GAVIOTA STATE PARK, PACIFIC OCEAN CA NOAA Chart: 18721 Latitude: 34° 28.2' N ( 34.46939) USGS Quad: GAVIOTA Longitude: 120° 13.7' W (-120.22831) T I D A L B E N C H M A R K S BENCH MARK STAMPING: M 761 1948 DESIGNATION: M 761 MONUMENTATION: Bench Mark disk VM#: 20627 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: DZ0045 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 34° 28.3' N ( 34.47133) LONGITUDE: 120° 13.7' W (-120.22861) The bench mark is a disk set in the top of a concrete monument, 48.53 m (159.2 ft) SSW of the shoulder of Highway 101 measured along the trail, 13.22 m (43.4 ft) WSW of the centerline of the abandoned highway right of way, 7.19 m (23.6 ft) SSW of power pole 949 675-E, 0.40 m (1.3 ft) ENE of a metal witness post and 0.18 m (0.6 ft) above the ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 6 Station ID: 9411399 PUBLICATION DATE: 05/10/2013 Name: GAVIOTA STATE PARK, PACIFIC OCEAN CA NOAA Chart: 18721 Latitude: 34° 28.2' N ( 34.46939) USGS Quad: GAVIOTA Longitude: 120° 13.7' W (-120.22831) T I D A L D A T U M S Tidal datums at GAVIOTA STATE PARK, PACIFIC OCEAN based on: LENGTH OF SERIES: 3 MONTHS TIME PERIOD: December 2012 - February 2013 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 9411340 SANTA BARBARA, PACIFIC OCEAN Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 1.611 MEAN HIGH WATER MHW = 1.387 MEAN TIDE LEVEL MTL = 0.842 MEAN SEA LEVEL MSL = 0.837 MEAN LOW WATER MLW = 0.297 North American Vertical Datum NAVD88 = 0.028 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 1399 A 2012 6.710 5.323 1399 B 2012 4.063 2.676 1399 C 2012 4.722 3.335 R 27 RESET 1957 25.138 23.751 M 761 1948 35.175 33.788
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 6 Station ID: 9411399 PUBLICATION DATE: 05/10/2013 Name: GAVIOTA STATE PARK, PACIFIC OCEAN CA NOAA Chart: 18721 Latitude: 34° 28.2' N ( 34.46939) USGS Quad: GAVIOTA Longitude: 120° 13.7' W (-120.22831) 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.