U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 4 PUBLICATION DATE: 10/19/1984 Station ID: 8725835 SUPERCEDED DATE: 04/21/2003 Name: LIVERPOOL, HUNTER CREEK FLORIDA NOAA Chart: 11426 Latitude: 27° 2.6' N USGS Quad: FORT OGDEN Longitude: 81° 59.2' W To reach the tidal bench marks proceed 11.5 miles (18.5 km) north along US Highway 19 from Punta Gorda to the intersection of US Highway 19 and the Sunnybreeze Golf Course Road. Continue NW on Sunnybreeze Golf Course Road and SW along the SSE side of the canal, continue on a dirt road to the Trailer Park. The bench marks are along the road leading to the Trailer Park and on the Trailer Park grounds, and the gage and staff were on the County Dock. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 5835 A 1977 MONUMENTATION: Survey Disk VM#: 6082 AGENCY: PID#: AF7408 SETTING CLASSIFICATION: Concrete Pad The bench mark is set into the concrete south of a turn-around at the Trailer Park, 81.0 feet (24.7 m) SW of Bench Mark 5835 B 1977, 7.0 feet (2.1 m) south of the edge of the shoreline and 2.0 feet (0.6 m) NE of a water tank. BENCH MARK STAMPING: 5835 B 1977 MONUMENTATION: Survey Disk VM#: 6083 AGENCY: PID#: AF7409 SETTING CLASSIFICATION: Concrete Pad The bench mark is set into concrete SE of a turn-around, 37.0 feet (11.3 m) south of a utility pole, 30.0 feet (9.1 m) south of the centerline of a dirt road leading to the trailer park and 2.5 feet (0.8 m) east of the door into the ladies rest room.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 4 PUBLICATION DATE: 10/19/1984 Station ID: 8725835 SUPERCEDED DATE: 04/21/2003 Name: LIVERPOOL, HUNTER CREEK FLORIDA NOAA Chart: 11426 Latitude: 27° 2.6' N USGS Quad: FORT OGDEN Longitude: 81° 59.2' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: LIVERPOOL B M 1 1956 MONUMENTATION: Survey Disk VM#: 6084 AGENCY: PID#: AF5100 SETTING CLASSIFICATION: Iron Pipe The bench mark is 387.0 feet (118.0 m) SE of a picnic shelter, 108.0 feet (32.9 m) west of Bench Mark LIVERPOOL 3, 99.0 feet (30.2 m) SW of the centerline of the road leading SE and 44.5 feet (13.6 m) west of the west corner of a concrete block store building, and is set into the top of a 0.3 foot diameter (0.1 m) pipe projecting 1.4 feet (0.4 m). BENCH MARK STAMPING: LIVERPOOL B M 4 1959 MONUMENTATION: Survey Disk VM#: 6085 AGENCY: PID#: AF5099 SETTING CLASSIFICATION: Concrete Pad The bench mark is set into concrete in the south side of the floor as a picnic shelter, 19.0 feet (5.8 m) west of the centerline of the boat ramp, 13.0 feet (4.0 m) east of the extended centerline of the blacktopped road, 8.3 feet (2.5 m) west of the SE corner and 1.0 foot (0.3 m) north of the south side of the picnic shelter floor. BENCH MARK STAMPING: LIVERPOOL 3 MONUMENTATION: Survey Disk VM#: 6086 AGENCY: PID#: AF5101 SETTING CLASSIFICATION: Concrete Post The bench mark is set into the top of a concrete post, at ground level, 119.0 feet (36.3 m) NE of the shoreline, 108.0 feet (32.9 m) east of Bench Mark LIVERPOOL B M I 1956, 47.0 feet (14.3 m) NE of the north corner of a concrete block store building, 39.0 feet (11.9 m) SE of the centerline of the road leading to the gas pumps for the boats and 1.2 feet (0.4 m) from a witness post.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 4 PUBLICATION DATE: 10/19/1984 Station ID: 8725835 SUPERCEDED DATE: 04/21/2003 Name: LIVERPOOL, HUNTER CREEK FLORIDA NOAA Chart: 11426 Latitude: 27° 2.6' N USGS Quad: FORT OGDEN Longitude: 81° 59.2' W T I D A L D A T U M S Tidal datums at LIVERPOOL, HUNTER CREEK based on: LENGTH OF SERIES: 4 MONTHS TIME PERIOD: FEBRUARY-MAY 1978 TIDAL EPOCH: 1960-1978 CONTROL TIDE STATION: 8725110 NAPLES Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET: HIGHEST OBSERVED WATER LEVEL (05/04/1978) = 3.81 MEAN HIGHER HIGH WATER MHHW = 2.21 MEAN HIGH WATER MHW = 1.93 MEAN TIDE LEVEL MTL = 1.19 * NATIONAL GEODETIC VERTICAL DATUM NGVD29 = 0.57 MEAN LOW WATER MLW = 0.45 MEAN LOWER LOW WATER MLLW = 0.00 LOWEST OBSERVED WATER LEVEL (02/05/1978) = -1.43 * NGVD reference based on adjustment of 1966 and NOS levels of 1977 - 1978. North American Vertical Datum (NAVD88) Bench Mark Elevation Information In FEET above: Stamping or Designation MLLW MHW 5835 A 1977 5.41 3.48 5835 B 1977 6.76 4.83 LIVERPOOL B M 1 1956 6.73 4.80 LIVERPOOL B M 4 1959 5.12 3.19 LIVERPOOL 3 5.92 3.99
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 4 PUBLICATION DATE: 10/19/1984 Station ID: 8725835 SUPERCEDED DATE: 04/21/2003 Name: LIVERPOOL, HUNTER CREEK FLORIDA NOAA Chart: 11426 Latitude: 27° 2.6' N USGS Quad: FORT OGDEN Longitude: 81° 59.2' W 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 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.