U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 8 Station ID: 8551910 PUBLICATION DATE: 09/27/2011 Name: REEDY POINT, C&D CANAL DE NOAA Chart: 12277 Latitude: 39° 33.5' N ( 39.55831) USGS Quad: DELAWARE CITY Longitude: 75° 34.4' W ( -75.57331) To reach the tidal bench marks from the intersection of Clinton Street and State Highway 9 in Delaware City, proceed 3.5 km (2.2 mi) south on Highway 9 over the Reedy Point bridge to South Reedy Point Road, turn right and continue 1.3 km (0.8 mi) to a gravel road that parallels the Chesapeake and Delaware Canal, then turn right and proceed 0.8 km (0.5 mi) to the Corps of Engineers T-pier. The bench marks are along South Reedy Point Road, the gravel road, and State Highway 9. The tide gauge and staff are on the pier, east of the bridge and on the south side of the canal. T I D A L B E N C H M A R K S
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 8 Station ID: 8551910 PUBLICATION DATE: 09/27/2011 Name: REEDY POINT, C&D CANAL DE NOAA Chart: 12277 Latitude: 39° 33.5' N ( 39.55831) USGS Quad: DELAWARE CITY Longitude: 75° 34.4' W ( -75.57331) T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: R 41 1979 DESIGNATION: R 41 MONUMENTATION: Bench Mark disk VM#: 383 AGENCY: National Geodetic Survey (NGS) IDB PID#: JU2187 SETTING CLASSIFICATION: Bridge pier foundation OPUS PID: LATITUDE: 39° 33.4' N ( 39.55672) LONGITUDE: 75° 34.9' W ( -75.58175) The primary bench mark is a disk set in the concrete foundation of the most easterly of the two concrete piers of the first row of bridge piers south of the south bank of the Chesapeake and Delaware canal, 16.70 m (54.79 ft) east of a gravel service road that parallels the bridge, 0.3 m (1.0 ft) south of the north face of the pier, and 0.02 m (0.07 ft) west of the west edge of the pier, 0.3 m (1.0 ft) below ground. BENCH MARK STAMPING: 1910 B 1979 DESIGNATION: 855 1910 B TIDAL MONUMENTATION: Tidal Station disk VM#: 376 AGENCY: National Ocean Survey (NOS) IDB PID#: JU2189 SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 39° 33.4' N ( 39.55669) LONGITUDE: 75° 34.4' W ( -75.57331) The bench mark is a disk located west of the pier on the south side of the dirt road along the canal bank, 129.0 m (423.2 ft) WSW of the SW corner of the pier, 12.07 m (39.6 ft) south of utility pole number 75 with light, and 6.40 m (21.0 ft) south of the center of the dirt road. The bench mark is set 15 cm (0.5 ft) above ground, crimped to the top of a stainless steel rod driven 9.8 m (32 ft) to refusal, and encased in a 4 inch PVC pipe with concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 8 Station ID: 8551910 PUBLICATION DATE: 09/27/2011 Name: REEDY POINT, C&D CANAL DE NOAA Chart: 12277 Latitude: 39° 33.5' N ( 39.55831) USGS Quad: DELAWARE CITY Longitude: 75° 34.4' W ( -75.57331) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 1910 C 1979 DESIGNATION: 855 1910 C TIDAL MONUMENTATION: Tidal Station disk VM#: 381 AGENCY: National Ocean Survey (NOS) IDB PID#: JU2188 SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 39° 33.4' N ( 39.55670) LONGITUDE: 75° 34.6' W ( -75.57670) The bench mark is a disk located on the south side of the dirt road along the canal bank, 0.3 km (0.2 mi) west of the pier, 13.72 m (45.0 ft) south of utility pole number 85 with light, 6.71 m (22.0 ft) south of the centerline of the dirt road, and 0.61 m (2.0 ft) north of a NOS witness post. The bench mark is set 15 cm (0.5 ft) above ground, crimped to the top of a stainless steel rod driven 9.1 m (30 ft) to refusal, and encased in a 4 inch PVC pipe with concrete kickblock. BENCH MARK STAMPING: 1910 G 1982 DESIGNATION: 855 1910 G MONUMENTATION: Tidal Station disk VM#: 382 AGENCY: National Ocean Survey (NOS) IDB PID#: AJ6314 SETTING CLASSIFICATION: Stainless steel rod OPUS PID#: AJ6314 LATITUDE: 39° 33.5' N ( 39.55844) LONGITUDE: 75° 34.3' W ( -75.57219) The bench mark is a disk set on the south side of the dirt road along the canal bank, on the extended centerline of the wood pier located on the bank, 26.06 m (85.50 ft) SW of a utility pole with light on the east side of the pier, 15.24 m (50.0 ft) south of the SW end of the pier, and 7.01 m (23.0 ft) south of the centerline of the dirt road. The bench mark is set 0.3 m (1 ft) below ground, crimped to the top of a stainless steel rod driven 8.8 m (28.9 ft) with 6 in (15 cm) water pipe surround the mark, and 0.6 m (2.0 ft) below ground.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 8 Station ID: 8551910 PUBLICATION DATE: 09/27/2011 Name: REEDY POINT, C&D CANAL DE NOAA Chart: 12277 Latitude: 39° 33.5' N ( 39.55831) USGS Quad: DELAWARE CITY Longitude: 75° 34.4' W ( -75.57331) T I D A L B E N C H M A R K S BENCH MARK STAMPING: RP 3 1975 DESIGNATION: 855 1910 TIDAL RP 3 MONUMENTATION: Tidal Station disk VM#: 385 AGENCY: National Ocean Survey (NOS) IDB PID#: JU2186 SETTING CLASSIFICATION: Concrete culvert head wall OPUS PID: LATITUDE: 39° 33.4' N ( 39.55670) LONGITUDE: 75° 34.9' W ( -75.58170) The bench mark is a disk set in a concrete culvert headwall along the east side of South Reedy Point Road, 147.0 m (482.3 ft) south of the canal, 50.11 m (164.4 ft) west of bridge Pier R38W, and 5.49 m (18.0 ft) east of the centerline of the road. The bench mark is a disk set in a concrete culvert headwall along the east side of south reedy point road, 147 m (482.3 ft) south of the canal, 50.11 m (164.40 ft) west of bridge pier r38w, and 5.49 m (18.01 ft) east of the centerline of the road. BENCH MARK STAMPING: RP 5 1975 DESIGNATION: 855 1910 TIDAL RP 5 MONUMENTATION: Tidal Station disk VM#: 386 AGENCY: National Ocean Survey (NOS) IDB PID#: JU2185 SETTING CLASSIFICATION: Concrete culvert head wall OPUS PID: LATITUDE: 39° 33.1' N ( 39.55170) LONGITUDE: 75° 34.8' W ( -75.58000) The bench mark is a disk set in a concrete culvert headwall along the west side of South Reedy Point Road, 23.01 m (75.5 ft) NW of bridge pier R53W, 20.42 m (67.0 ft) SW of bridge pier R52W, 6.80 m (22.3 ft) SE of utility pole number DP&L 27, and 6.71 m (22.0 ft) west of the road centerline.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 8 Station ID: 8551910 PUBLICATION DATE: 09/27/2011 Name: REEDY POINT, C&D CANAL DE NOAA Chart: 12277 Latitude: 39° 33.5' N ( 39.55831) USGS Quad: DELAWARE CITY Longitude: 75° 34.4' W ( -75.57331) T I D A L B E N C H M A R K S BENCH MARK STAMPING: R 72 W DESIGNATION: 855 1910 R 72 W MONUMENTATION: Survey disk VM#: 12414 AGENCY: US Army Corps of Engineers (USE) IDB PID#: SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 39° 32.8' N ( 39.54619) LONGITUDE: 75° 34.8' W ( -75.57992) The bench mark is a disk set in a concrete monument located on the west side of U.S. Highway 9 near the south end of the bridge leading over the canal, 121.3 m (398.0 ft) NE of the junction of Route 9 and South Reedy Point Road, 59.62 m (195.60 ft) south of the south end of the bridge, 7.19 m (23.59 ft) SW of the centerline of Route 9, and 0.21 m (0.7 ft) west of the curb, and 0.7 m (2.3 ft) above the road surface. BENCH MARK STAMPING: 1910 H 1997 DESIGNATION: 855 1910 H MONUMENTATION: Flange-encased Rod VM#: 13758 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID: LATITUDE: 39° 33.3' N ( 39.55444) LONGITUDE: 75° 34.9' W ( -75.58164) The bench mark is a flange encased rod located on the east side of South Reedy Point Road, 0.3 km (0.2 mi) from the intersection of Dutch Neck Road, 65.20 m (213.9 ft) south of the stop sign on the east side of the road, 4.50 m (14.76 ft) east of the road centerline, and 2.80 m (9.2 ft) west of a NOS witness post, 2.10 m (6.9 ft) east of the east edge of the road. The datum point is the top of a stainless steel rod driven 17.4 m (57.1 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.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 8 Station ID: 8551910 PUBLICATION DATE: 09/27/2011 Name: REEDY POINT, C&D CANAL DE NOAA Chart: 12277 Latitude: 39° 33.5' N ( 39.55831) USGS Quad: DELAWARE CITY Longitude: 75° 34.4' W ( -75.57331) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 1910 J 1997 DESIGNATION: 855 1910 J MONUMENTATION: Flange-encased Rod VM#: 13759 AGENCY: National Ocean Service (NOS) IDB PID#: AJ6315 SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID#: AJ6315 LATITUDE: 39° 33.5' N ( 39.55830) LONGITUDE: 75° 34.4' W ( -75.57330) The bench mark is a flange-encased rod located on the west side of South Reedy Point Road, 49.25 m (161.6 ft) north of power pole number 29, 33.60 m (110.2 ft) south of the south side of the driveway for the residence at 270 South Reedy Point Drive, 8.20 m (26.9 ft) west of the centerline of South Reedy Point Road, and 6.25 m (20.5 ft) SSE of power pole number 30. The datum point is the top of a stainless steel rod driven 18.0 m (59 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. BENCH MARK STAMPING: 1910 K 1997 DESIGNATION: 855 1910 K MONUMENTATION: Flange-encased Rod VM#: 13760 AGENCY: National Ocean Service (NOS) IDB PID#: AJ6316 SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID: LATITUDE: 39° 32.7' N ( 39.54500) LONGITUDE: 75° 34.8' W ( -75.58000) The bench mark is a flange-encased rod located on the east side of South Reedy Point Road, 19.30 m (63.3 ft) NE of power pole 6, 9.86 m (32.4 ft) west of the curb on the west side of Highway 9, 7.20 m (23.6 ft) east of the centerline of South Reedy Point Road, and 0.25 m (0.8 ft) west of an orange fiberglass NOS witness post. The datum point is the top of a stainless steel rod driven 11.9 m (39 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 7 of 8 Station ID: 8551910 PUBLICATION DATE: 09/27/2011 Name: REEDY POINT, C&D CANAL DE NOAA Chart: 12277 Latitude: 39° 33.5' N ( 39.55831) USGS Quad: DELAWARE CITY Longitude: 75° 34.4' W ( -75.57331) T I D A L D A T U M S Tidal datums at REEDY POINT, C&D CANAL 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 (04/17/2011) = 2.816 MEAN HIGHER HIGH WATER MHHW = 1.780 MEAN HIGH WATER MHW = 1.683 North American Vertical Datum NAVD88 = 0.905 MEAN SEA LEVEL MSL = 0.890 MEAN TIDE LEVEL MTL = 0.869 MEAN LOW WATER MLW = 0.055 MEAN LOWER LOW WATER MLLW = 0.000 LOWEST OBSERVED WATER LEVEL (04/07/1982) = -1.222 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW R 41 1979 1.620 -0.063 1910 B 1979 3.268 1.585 1910 C 1979 3.148 1.465 1910 G 1982 2.390 0.707 RP 3 1975 1.875 0.192 RP 5 1975 2.325 0.642 R 72 W 5.904 4.221 1910 H 1997 1.784 0.101 1910 J 1997 2.467 0.784 1910 K 1997 2.534 0.851
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 8 of 8 Station ID: 8551910 PUBLICATION DATE: 09/27/2011 Name: REEDY POINT, C&D CANAL DE NOAA Chart: 12277 Latitude: 39° 33.5' N ( 39.55831) USGS Quad: DELAWARE CITY Longitude: 75° 34.4' W ( -75.57331) 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.