HY1172 ***********************************************************************
HY1172  DESIGNATION -  W 120
HY1172  PID         -  HY1172
HY1172  STATE/COUNTY-  OH/SCIOTO
HY1172  USGS QUAD   -  NEW BOSTON (1975)
HY1172
HY1172                         *CURRENT SURVEY CONTROL
HY1172  ___________________________________________________________________
HY1172* NAD 83(1986)-  38 45 20.     (N)    082 59 36.     (W)     SCALED
HY1172* NAVD 88     -       163.763  (meters)     537.28   (feet)  ADJUSTED
HY1172  ___________________________________________________________________
HY1172  GEOID HEIGHT-         -32.97  (meters)                     GEOID99
HY1172  DYNAMIC HT  -         163.661 (meters)     536.94  (feet)  COMP
HY1172  MODELED GRAV-     980,003.0   (mgal)                       NAVD 88
HY1172
HY1172  VERT ORDER  -  FIRST     CLASS I
HY1172
HY1172.The horizontal coordinates were scaled from a topographic map and have
HY1172.an estimated accuracy of +/- 6 seconds.
HY1172
HY1172.The orthometric height was determined by differential leveling
HY1172.and adjusted by the National Geodetic Survey in June 1991.
HY1172.WARNING-Repeat measurements at this control monument indicate possible
HY1172.vertical movement.
HY1172
HY1172.The geoid height was determined by GEOID99.
HY1172
HY1172.The dynamic height is computed by dividing the NAVD 88
HY1172.geopotential number by the normal gravity value computed on the
HY1172.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
HY1172.degrees latitude (g = 980.6199 gals.).
HY1172
HY1172.The modeled gravity was interpolated from observed gravity values.
HY1172
HY1172;                    North         East    Units  Estimated Accuracy
HY1172;SPC OH S     -    84,000.      557,120.      MT  (+/- 180 meters Scaled)
HY1172
HY1172                          SUPERSEDED SURVEY CONTROL
HY1172
HY1172  NGVD 29     -       163.947  (m)          537.88   (f) ADJ UNCH    1 1
HY1172
HY1172.Superseded values are not recommended for survey control.
HY1172.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
HY1172.See file dsdata.txt to determine how the superseded data were derived.
HY1172
HY1172_MARKER: DB = BENCH MARK DISK
HY1172_SETTING: 36 = ABUTMENT
HY1172_STAMPING: W 120 1943
HY1172_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL
HY1172
HY1172  HISTORY     - Date     Condition        Recov. By
HY1172  HISTORY     - 1943     MONUMENTED       CGS
HY1172  HISTORY     - 1967     GOOD             NGS
HY1172
HY1172                          STATION DESCRIPTION
HY1172
HY1172''DESCRIBED BY NATIONAL GEODETIC SURVEY 1967
HY1172''0.8 MI N FROM PORTSMOUTH.
HY1172''ABOUT 0.8 MILE NORTH ALONG THE NORFOLK AND WESTERN RAILWAY FROM
HY1172''THE STATION AT PORTSMOUTH, 252 YARDS NORTH OF MILEPOST N 608,
HY1172''SET ON THE TOP OF THE EAST END OF THE NORTH STONE AND CONCRETE
HY1172''ABUTMENT OF A 15-FOOT CONCRETE BRIDGE, 90 FEET NORTH OF THE
HY1172''EXTENDED CENTER LINE OF CLARE STREET, 8 FEET EAST OF THE EAST
HY1172''RAIL AND 1 FOOT BELOW THE LEVEL OF THE TRACK.