U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 4 Station ID: 8720213 PUBLICATION DATE: 02/26/2004 Name: TROUT R., SHERWOOD FOREST FL NOAA Chart: 11488 Latitude: 30° 25.2' N ( 30.42000) USGS Quad: TROUT RIVER Longitude: 81° 43.7' W ( -81.72830) To reach the tidal bench marks from the intersection of Edgewood Avenue and Lem Turner Road in Jacksonville, proceed north along Lem Turner Road for 3.2 km (2.0 mi), then west on Trout River Boulevard for 3.2 km (2.0 mi) to 5339 Trout River Boulevard. The bench marks are located along Trout River Boulevard and Sibbald Avenue. The tide gage and staff were located on a private dock behind the residence at 5339 Trout River Boulevard. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 0213 C 1978 DESIGNATION: 872 0213 C TIDAL MONUMENTATION: Tidal Station disk VM#: 5090 AGENCY: National Ocean Survey (NOS) IDB PID#: BC2480 SETTING CLASSIFICATION: Concrete bridge guardrail OPUS PID: LATITUDE: 30° 24.9' N ( 30.41583) LONGITUDE: 81° 44.0' W ( -81.73342) The primary bench mark is a disk set in a 0.3 m x 1 m (1 ft x 2 ft) concrete guardrail located on the SE corner of the Trout River Boulevard bridge over Nine Mile Creek, 6.22 m (20.4 ft) south of the centerline of Trout River Boulevard, 2 m (6 ft) west of a witness post, and 0.40 m (1.3 ft) south of the bridge railing, and 1 m (3 ft) above the road.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 4 Station ID: 8720213 PUBLICATION DATE: 02/26/2004 Name: TROUT R., SHERWOOD FOREST FL NOAA Chart: 11488 Latitude: 30° 25.2' N ( 30.42000) USGS Quad: TROUT RIVER Longitude: 81° 43.7' W ( -81.72830) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 0213 D 1978 DESIGNATION: 872 0213 D TIDAL MONUMENTATION: Tidal Station disk VM#: 5091 AGENCY: National Ocean Survey (NOS) IDB PID#: BC2478 SETTING CLASSIFICATION: Concrete head wall OPUS PID#: BC2478 LATITUDE: 30° 24.7' N ( 30.41194) LONGITUDE: 81° 43.9' W ( -81.73194) The bench mark is a disk set in a concert head wall, 29 m (96 ft) north of the intersection of Sibbald Road and Gilchrist Road, 12 m (40 ft) east of the centerline of the south bound lane of Sibbald Road, 6 m (20 ft) west of the centerline of the north bound lane of Sibbald Road, and 0.76 m (2.5 ft) south of a witness post. BENCH MARK STAMPING: 0213 E 1978 DESIGNATION: 872 0213 E TIDAL MONUMENTATION: Tidal Station disk VM#: 5092 AGENCY: National Ocean Survey (NOS) IDB PID#: BC2477 SETTING CLASSIFICATION: Concrete head wall OPUS PID: LATITUDE: 30° 24.0' N ( 30.40011) LONGITUDE: 81° 44.5' W ( -81.74167) The bench mark is a disk set in a concrete headwall, 0.6 km (0.4 mi) south of the intersection of Gilchrist Road and New Kings Road (US Highway 1), 19 m (61 ft) west of the median of New Kings Road, 18 m (58 ft) NW of the centerline of a the NW drive of the White and Son's Service Station, 9 m (30 ft) NE of a chain link fence, and 1 m (3 ft) south of a witness post.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 4 Station ID: 8720213 PUBLICATION DATE: 02/26/2004 Name: TROUT R., SHERWOOD FOREST FL NOAA Chart: 11488 Latitude: 30° 25.2' N ( 30.42000) USGS Quad: TROUT RIVER Longitude: 81° 43.7' W ( -81.72830) T I D A L D A T U M S Tidal datums at TROUT R., SHERWOOD FOREST based on: LENGTH OF SERIES: 4 MONTHS TIME PERIOD: September 1978 - December 1978 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8720220 MAYPORT Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 0.868 MEAN HIGH WATER MHW = 0.825 North American Vertical Datum NAVD88 = 0.488 MEAN TIDE LEVEL MTL = 0.427 MEAN SEA LEVEL MSL = 0.420 MEAN LOW WATER MLW = 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 0213 C 1978 3.881 3.056 0213 D 1978 3.162 2.337 0213 E 1978 6.660 5.835
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 4 Station ID: 8720213 PUBLICATION DATE: 02/26/2004 Name: TROUT R., SHERWOOD FOREST FL NOAA Chart: 11488 Latitude: 30° 25.2' N ( 30.42000) USGS Quad: TROUT RIVER Longitude: 81° 43.7' W ( -81.72830) 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.