U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 6 Station ID: 8573349 PUBLICATION DATE: 10/12/2011 Name: CRUMPTON, CHESTER RIVER MD NOAA Chart: 12272 Latitude: 39° 14.7' N ( 39.24500) USGS Quad: CHURCH HILL Longitude: 75° 55.5' W ( -75.92500) To reach the tidal bench marks from the intersection of MD-213 and MD-544 in Chestertown, MD, proceed east on MD-544 (McGinnes Road) towards Crumpton for 7.6 km (4.7 mi), turn left on Deep Landing Road, then continue north for 2.6 km (1.6 mi) to the County Park on the Chester River. The bench marks are up the hill along Deep Landing Road and the tide gauge was on the sea wall of the park. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 3349 A 2005 DESIGNATION: 857 3349 A MONUMENTATION: Flange-encased Rod VM#: 17852 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID: LATITUDE: 39° 14.6' N ( 39.24330) LONGITUDE: 75° 57.6' W ( -75.96000) The primary bench mark is a flange-encased rod located on the corner of Deep Landing Road and Hoffman Lane, 11.13 m (36.5 ft) SE of the centerline of the gravel drive of residence 907, 6.95 m (22.8 ft) south of Hoffman Lane, and 6.31 m (20.7 ft) ESE of center line of Deep Landing Road. The datum point is flush with the ground, being the top of a stainless steel rod driven 22.7 m (74 ft) to refusal, in a sleeve extending to a depth of 0.6 m (2.0 ft) and encased in a 5-inch NOS logo cap.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 6 Station ID: 8573349 PUBLICATION DATE: 10/12/2011 Name: CRUMPTON, CHESTER RIVER MD NOAA Chart: 12272 Latitude: 39° 14.7' N ( 39.24500) USGS Quad: CHURCH HILL Longitude: 75° 55.5' W ( -75.92500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 3349 C 2005 DESIGNATION: 857 3349 C MONUMENTATION: Flange-encased Rod VM#: 17853 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID: LATITUDE: 39° 14.6' N ( 39.24330) LONGITUDE: 75° 57.7' W ( -75.96170) The bench mark is a flange-encased rod located along Deep Landing Road, 15.67 m (51.4 ft) south of a gravel drive at residence 801 Deep Landing Road, 6.25 m (20.5 ft) east of the centerline of Deep Landing Road, 3.75 m (12.3 ft) west of power pole "193 97 22" and 0.46 m (1.5 ft) west of a witness post. The datum point is flush with the ground, being the top of a stainless steel rod driven 14.6 m (48 ft) to refusal, in a sleeve extending to a depth of 0.6 m (2.0 ft) and encased in a 5-inch NOS logo cap. BENCH MARK STAMPING: 3349 B 2005 DESIGNATION: 857 3349 B MONUMENTATION: Flange-encased Rod VM#: 17854 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID: LATITUDE: 39° 14.6' N ( 39.24330) LONGITUDE: 75° 57.7' W ( -75.96170) The bench mark is a flange-encased rod located along Deep Landing Road, 23.90 meters (78.4 ft) west of the SW corner of a white house (residence 113 Deep Landing Road), 11.80 m (38.7 ft) north of the residence driveway at 107 Deep Landing Road, 4.82 m (15.8 ft) NW of the centerline of Deep Landing Road, and 0.43 m (1.4 ft) ESE of a witness post. The datum point is flush with the ground, being the top of a stainless steel rod driven 15.8 m (52 ft) to refusal, in a sleeve extending to a depth of 0.6 m (2.0 ft) and encased in a 5-inch NOS logo cap.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 6 Station ID: 8573349 PUBLICATION DATE: 10/12/2011 Name: CRUMPTON, CHESTER RIVER MD NOAA Chart: 12272 Latitude: 39° 14.7' N ( 39.24500) USGS Quad: CHURCH HILL Longitude: 75° 55.5' W ( -75.92500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 3349 D 2005 DESIGNATION: 857 3349 D MONUMENTATION: Tidal Station disk VM#: 17855 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Flange-encased rod OPUS PID: LATITUDE: 39° 14.4' N ( 39.24025) LONGITUDE: 75° 57.5' W ( -75.95894) The bench mark is a stainless steel rod on the SE corner of the parking lot of the boat ramp at the end of the deep landing road,18.2 m (59.7 ft) south of the tide station, 14.5 m (47.6 ft) SSE of the SE corner of the bulkhead of the public boat ramp, 9.0 m (29.5 ft) SSW of a fire hydrant on the east side of the boat ramp parking lot at the end of the deep landing road, 7.3 m (24.0 ft) SW of the SW corner of a house at 101 Hoffman Ln, and 0.3 m (1.0 ft) W of a witness post. The bench mark is set flush in the ground, driven 23.7 m (77.8 ft) to refusal, with a sleeve extending to a depth of 1.8 m (5.9 ft) and encased in a 5-inch PVC pipe, with a 5-inch NOS logo cap. The PVC pipe is surrounded by a concrete kick block.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 6 Station ID: 8573349 PUBLICATION DATE: 10/12/2011 Name: CRUMPTON, CHESTER RIVER MD NOAA Chart: 12272 Latitude: 39° 14.7' N ( 39.24500) USGS Quad: CHURCH HILL Longitude: 75° 55.5' W ( -75.92500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 3349 E 2005 DESIGNATION: 857 3349 E MONUMENTATION: Tidal Station disk VM#: 17856 AGENCY: National Ocean Service (NOS) IDB PID#: SETTING CLASSIFICATION: Flange-encased rod OPUS PID: LATITUDE: 39° 14.3' N ( 39.23825) LONGITUDE: 75° 57.6' W ( -75.96000) The bench mark is a stainless steel rod set in the vicinity of the boat ramp at the end of the deep landing road, 18.7 m (61.4 ft) south of the south side of the house at 801 Deep Landing Rd, 9.5 m (31.2 ft) SE of a utility pole numbered 193.97.21 on the corner of Deep Landing Rd and Hickory Ln, 9.2 m (30.2 ft) east of the eastside of a house at 733 Deep Landing Rd,6.4 m SW of the center of intersection of Pine Grove Lane and Deep Landing Rd, 1.4 m (4.59 ft) west of the centerline of Deep Landing Rd, 0.7 m (2.3 ft) east of a turkey oak tree at 733 Deep Landing Rd, and 0.2 m (0.7 ft) east of a carbonate witness post. The bench mark is set flush with the ground, driven 23.7 meters (77.8 ft) to refusal, with a sleeve extending to a depth of 1.8 m (5.9 ft) and encased in a 5-inch PVC pipe with a 5-inch NOS logo cap. The PVC is surrounded by a cement kick block.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 6 Station ID: 8573349 PUBLICATION DATE: 10/12/2011 Name: CRUMPTON, CHESTER RIVER MD NOAA Chart: 12272 Latitude: 39° 14.7' N ( 39.24500) USGS Quad: CHURCH HILL Longitude: 75° 55.5' W ( -75.92500) T I D A L D A T U M S Tidal datums at CRUMPTON, CHESTER RIVER based on: LENGTH OF SERIES: 3 YEARS TIME PERIOD: May 2005 - April 2008 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8574680 BALTIMORE, FORT MCHENRY, PATAPSCO RIVER Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: HIGHEST OBSERVED WATER LEVEL (10/01/2010) = 1.586 MEAN HIGHER HIGH WATER MHHW = 0.841 MEAN HIGH WATER MHW = 0.748 MEAN SEA LEVEL MSL = 0.419 MEAN TIDE LEVEL MTL = 0.411 MEAN LOW WATER MLW = 0.074 MEAN LOWER LOW WATER MLLW = 0.000 LOWEST OBSERVED WATER LEVEL (01/15/2006) = -0.704 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 3349 A 2005 6.689 5.941 3349 C 2005 9.097 8.349 3349 B 2005 8.015 7.267 3349 D 2005 3.490 2.742 3349 E 2005 9.729 8.981
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 6 Station ID: 8573349 PUBLICATION DATE: 10/12/2011 Name: CRUMPTON, CHESTER RIVER MD NOAA Chart: 12272 Latitude: 39° 14.7' N ( 39.24500) USGS Quad: CHURCH HILL Longitude: 75° 55.5' W ( -75.92500) 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.