U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 7 Station ID: 8557380 PUBLICATION DATE: 09/13/2017 Name: LEWES, FT. MILES DE NOAA Chart: 12216 Latitude: 38° 47.0' N ( 38.78278) USGS Quad: CAPE HENLOPEN Longitude: 75° 7.1' W ( -75.11916) To reach the tidal bench marks from the Post Office in Lewes, proceed SE on Front Street for 0.2 km (0.1 mi), then 0.8 km (0.5 mi) NE on Savannah Road to Henlopen Drive. Continue on Henlopen Drive for 1.3 km (0.8 mi) to the Cape May-Lewes Ferry Terminal. The bench marks are within a 1.6 km (1 mi) radius of the ferry terminal and the tide house is located on the west side of Ferry Slip No. 2. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: NO 20 1975 DESIGNATION: 855 7380 TIDAL 20 MONUMENTATION: Tidal Station disk VM#: 390 AGENCY: National Ocean Survey (NOS) IDB PID#: AJ8038 SETTING CLASSIFICATION: Bollard foundation OPUS PID#: AJ8038 LATITUDE: 38° 46.9' N ( 38.78233) LONGITUDE: 75° 7.1' W ( -75.11867) The primary bench mark is a disk set in the concrete foundation of a bollard located east of ferry slip number 2, 3.44 m (11.3 ft) east of the east side of a ramp, and 1.89 m (6.2 ft) north of the NW corner of a chain link fence on the east side of the east loading ramp, 0.85 m (2.8 ft) east of the center of the bollard.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 7 Station ID: 8557380 PUBLICATION DATE: 09/13/2017 Name: LEWES, FT. MILES DE NOAA Chart: 12216 Latitude: 38° 47.0' N ( 38.78278) USGS Quad: CAPE HENLOPEN Longitude: 75° 7.1' W ( -75.11916) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 7380 B 1979 DESIGNATION: 855 7380 B MONUMENTATION: Tidal Station disk VM#: 395 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 38° 46.9' N ( 38.78089) LONGITUDE: 75° 7.0' W ( -75.11706) The bench mark is a disk located south of the visitors parking area, 26.52 m (87.0 ft) east of the centerline of the entrance road to the parking area, 24.41 m (80.1 ft) SE of the sign reading foot passager parking from east steel lag of sign, 7.01 m (23.0 ft) south of the centerline of the drive to the east end of the parking area, and 0.43 m (1.4 ft) north of the power pole stamped on the west side CPT B288. The bench mark is 0.3 m (1 ft) below ground, crimped to the top of a stainless steel rod driven 12.8 m (42 ft) to refusal, and encased in a 4 inch PVC pipe with concrete kickblock. BENCH MARK STAMPING: 37 1947 DESIGNATION: 855 7380 TIDAL 37 MONUMENTATION: Tidal Station disk VM#: 399 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: HU0087 SETTING CLASSIFICATION: Flagpole foundation OPUS PID: LATITUDE: 38° 46.9' N ( 38.78122) LONGITUDE: 75° 7.2' W ( -75.11950) The bench mark is set in the center of the SW concrete foundation, located at the Harbor Pilots Association base, 31.1 m (102.0 ft) north of NE corner of the pilots residence, 27.19 m (89.21 ft) NE of the ne corner of a concrete flag pole foundation (flag pole no longer exists), 19.48 m (63.91 ft) east of a walkway leading to the dock, and 8.69 m (28.51 ft) west of a chain link fence along the east side of the base.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 7 Station ID: 8557380 PUBLICATION DATE: 09/13/2017 Name: LEWES, FT. MILES DE NOAA Chart: 12216 Latitude: 38° 47.0' N ( 38.78278) USGS Quad: CAPE HENLOPEN Longitude: 75° 7.1' W ( -75.11916) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 7380 D 1986 DESIGNATION: 855 7380 D MONUMENTATION: Tidal Station disk VM#: 400 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 38° 46.9' N ( 38.78225) LONGITUDE: 75° 7.1' W ( -75.11756) The bench mark is a disk located in the miniature golf course near the ferry terminal concession stand, 21.34 m (70.0 ft) NE of the NE corner of the ferry terminal building, 5.12 m (16.8 ft) south of the teak wood deck, 4.18 m (13.7 ft) east of the east edge of the concrete and brick patio surrounding the restaurant, and 0.52 m (1.7 ft) south of a NOAA witness post. The bench mark is 0.3 m (1 ft) below ground, crimped to a stainless steel rod driven 14.0 m (46 ft) to refusal, and encased in a 6 inch PVC pipe with concrete kickblock. BENCH MARK STAMPING: 7380 E 1986 DESIGNATION: 855 7380 E MONUMENTATION: Tidal Station disk VM#: 401 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 38° 46.9' N ( 38.78092) LONGITUDE: 75° 7.1' W ( -75.11828) The bench mark is a disk located at the ferry terminal parking area, 29.63 (97.2 ft) east of the centerline of the exit gate, 29.17 m (95.7 ft) north of the centerline of Henlopen Drive, 29.02 m (95.2 ft) SW of the SW corner of the westernmost ticket booth, 0.67 m (2.2 ft) north of power pole number 24, and 0.67 m (2.2 ft) east of a witness post. The bench mark is 0.15 m (0.5 ft) below ground, crimped to a stainless steel rod driven 12.8 m (42 ft) to refusal, and encased in a 6 inch PVC pipe with concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 7 Station ID: 8557380 PUBLICATION DATE: 09/13/2017 Name: LEWES, FT. MILES DE NOAA Chart: 12216 Latitude: 38° 47.0' N ( 38.78278) USGS Quad: CAPE HENLOPEN Longitude: 75° 7.1' W ( -75.11916) T I D A L B E N C H M A R K S BENCH MARK STAMPING: GPS S-5A 1990 DESIGNATION: GPS S 5 A MONUMENTATION: Horizontal Station disk VM#: 13820 AGENCY: DEDHT IDB PID#: HU2679 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 38° 46.6' N ( 38.77642) LONGITUDE: 75° 7.8' W ( -75.12928) The bench mark is a disk set in a 0.3 m x 0.3 m (1 ft x 1 ft) concrete monument, located along the north side of U.S. Highway 9 between the bridge over the Lewes and Rehoboth Canal and the turnoff to the Cape May - Lewes Ferry, 128.0 m (420 ft) east of the east end of the concrete curb on the bridge slope, 49.80 m (163.4 ft) west of a road reflector post, 7.80 m (25.6 ft) north of the highway centerline, 1.01 m (3.3 ft) north of a metal guardrail, and 0.3 m (1 ft) south of a fiberglass witness post. BENCH MARK STAMPING: 7380 F 1997 DESIGNATION: 855 7380 F MONUMENTATION: Flange-encased Rod VM#: 13821 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID: LATITUDE: 38° 46.8' N ( 38.78019) LONGITUDE: 75° 7.6' W ( -75.12592) The bench mark is located along the north side of Henlopen Drive about 0.40 km (0.25 mi) before the entrance to the ferry terminal, 48.01 m (157.5 ft) ESE of the centerline of a paved road leading to the Pilots Point Condos, 13.80 m (45.3 ft) NNE of the centerline of Henlopen Drive, 8.25 m (27.1 ft) WNW of a steel structure over the road, and 0.35 m (1.2 ft) SSW of a NOAA witness post. The datum point is the top of a stainless steel rod driven 12.07 m (39.6 ft) to refusal, in a grease filled sleeve extending to a depth of 1 m (3 ft), and encased in a 5 inch logo cap.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 7 Station ID: 8557380 PUBLICATION DATE: 09/13/2017 Name: LEWES, FT. MILES DE NOAA Chart: 12216 Latitude: 38° 47.0' N ( 38.78278) USGS Quad: CAPE HENLOPEN Longitude: 75° 7.1' W ( -75.11916) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 7380 G 1997 DESIGNATION: 855 7380 G MONUMENTATION: Flange-encased Rod VM#: 13822 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID: LATITUDE: 38° 46.8' N ( 38.78019) LONGITUDE: 75° 7.6' W ( -75.12592) The bench mark is a disk located near the intersection of U.S. Highway 9 and Henlopen Drive, 24.20 m (79.4 ft) west of the south leg of a green state highway sign, 12.70 m (41.7 ft) NNE of the center median strip of Henlopen Drive, 10.40 m (34.1 ft) west of power pole number 14 with light, and 0.35 m (1.15 ft) SSW of a NOAA witness post. The datum point is the top of a stainless steel rod driven 18.20 m (59.7 ft) to refusal, in a grease filled sleeve extending to a depth of 1 m (3.3 ft), and encased in a 5 inch logo cap. Note-The sleeve depth does not meet the specifications for a Class A rod mark. BENCH MARK STAMPING: 7380 H 2003 DESIGNATION: 855 7380 H MONUMENTATION: Tidal Station disk VM#: 17205 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Concrete foundation OPUS PID: LATITUDE: 38° 47.0' N ( 38.78289) LONGITUDE: 75° 7.2' W ( -75.11919) The bench mark is a disk set in the concrete foundation for a yellow bollard located on the north side of the NOAA tide station between bumper 37 and bumper 36, 10.58 m (34.7 ft) east of the west side of slip 1, 5.43 m (17.8 ft) north of the north side of the tide shelter box, and 1.65 m (5.4 ft) west of the east side of the slip.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 7 Station ID: 8557380 PUBLICATION DATE: 09/13/2017 Name: LEWES, FT. MILES DE NOAA Chart: 12216 Latitude: 38° 47.0' N ( 38.78278) USGS Quad: CAPE HENLOPEN Longitude: 75° 7.1' W ( -75.11916) T I D A L D A T U M S Tidal datums at LEWES, FT. MILES based on: LENGTH OF SERIES: 19 YEARS TIME PERIOD: January 1983 - December 2001 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: HIGHEST OBSERVED WATER LEVEL (01/23/2016) = 2.821 MEAN HIGHER HIGH WATER MHHW = 1.418 MEAN HIGH WATER MHW = 1.290 North American Vertical Datum NAVD88 = 0.801 MEAN SEA LEVEL MSL = 0.680 MEAN TIDE LEVEL MTL = 0.669 MEAN LOW WATER MLW = 0.048 MEAN LOWER LOW WATER MLLW = 0.000 LOWEST OBSERVED WATER LEVEL (01/10/1978) = -1.284 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW NO 20 1975 3.142 1.852 7380 B 1979 2.566 1.276 37 1947 3.254 1.964 7380 D 1986 2.904 1.614 7380 E 1986 1.957 0.667 GPS S-5A 1990 3.194 1.904 7380 F 1997 1.887 0.597 7380 G 1997 2.019 0.729 7380 H 2003 3.106 1.816
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 7 Station ID: 8557380 PUBLICATION DATE: 09/13/2017 Name: LEWES, FT. MILES DE NOAA Chart: 12216 Latitude: 38° 47.0' N ( 38.78278) USGS Quad: CAPE HENLOPEN Longitude: 75° 7.1' W ( -75.11916) 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.