GR0577 ***********************************************************************
GR0577  DESIGNATION -  HOOVER DAM BLOCK T=V 4
GR0577  PID         -  GR0577
GR0577  STATE/COUNTY-  NV/CLARK
GR0577  USGS QUAD   -  HOOVER DAM (1984)
GR0577
GR0577                         *CURRENT SURVEY CONTROL
GR0577  ___________________________________________________________________
GR0577* NAD 83(1986)-  36 00 59.     (N)    114 44 20.     (W)     SCALED
GR0577* NAVD 88     -       376.389  (meters)    1234.87   (feet)  ADJUSTED
GR0577  ___________________________________________________________________
GR0577  GEOID HEIGHT-         -28.26  (meters)                     GEOID99
GR0577  DYNAMIC HT  -         376.020 (meters)    1233.66  (feet)  COMP
GR0577  MODELED GRAV-     979,642.6   (mgal)                       NAVD 88
GR0577
GR0577  VERT ORDER  -  FIRST     CLASS I
GR0577
GR0577.The horizontal coordinates were scaled from a topographic map and have
GR0577.an estimated accuracy of +/- 6 seconds.
GR0577
GR0577.The orthometric height was determined by differential leveling
GR0577.and adjusted by the National Geodetic Survey in June 1991.
GR0577
GR0577.The geoid height was determined by GEOID99.
GR0577
GR0577.The dynamic height is computed by dividing the NAVD 88
GR0577.geopotential number by the normal gravity value computed on the
GR0577.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
GR0577.degrees latitude (G = 980.6199 gals.).
GR0577
GR0577.The modeled gravity was interpolated from observed gravity values.
GR0577
GR0577;                    North         East    Units  Estimated Accuracy
GR0577;SPC NV E     - 8,140,820.      276,120.      MT  (+/- 180 meters Scaled)
GR0577
GR0577                          SUPERSEDED SURVEY CONTROL
GR0577
GR0577  NGVD 29     -       375.673  (m)         1232.52   (f) ADJ UNCH    1 1
GR0577
GR0577.Superseded values are not recommended for survey control.
GR0577.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
GR0577.See file dsdata.txt to determine how the superseded data were derived.
GR0577
GR0577_MARKER: DS = TRIANGULATION STATION DISK
GR0577_SETTING: 30 = SIDEWALK
GR0577_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
GR0577
GR0577  HISTORY     - Date     Condition        Recov. By
GR0577  HISTORY     - UNK      MONUMENTED       CGS
GR0577  HISTORY     - 1950     GOOD             NGS
GR0577  HISTORY     - 1963     GOOD             NGS
GR0577  HISTORY     - 1981     GOOD             NGS
GR0577  HISTORY     - 1990     GOOD             USPSQD
GR0577  HISTORY     - 19961102 GOOD             USPSQD
GR0577
GR0577                          STATION DESCRIPTION
GR0577
GR0577''DESCRIBED BY NATIONAL GEODETIC SURVEY 1950
GR0577''IN HOOVER DAM.
GR0577''ON TOP OF HOOVER DAM, 58.4 FEET EAST OF THE NORTHWEST (NEVADA) END, AT
GR0577''THE NORTH (UPSTREAM) SIDE OF BLOCK T, IN THE TOP OF THE NORTH
GR0577''SIDEWALK, 4.4 FEET WEST OF THE WEST END OF A CONCRETE GUARD RAIL, AND
GR0577''1.6 FEET SOUTH OF THE BOTTOM STEP OF THE HOOVER DAM MEMORIAL.  NOTE--
GR0577''DISK IS UNSTAMPED.
GR0577
GR0577                          STATION RECOVERY (1963)
GR0577
GR0577''RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1963
GR0577''RECOVERED IN GOOD CONDITION.
GR0577
GR0577                          STATION RECOVERY (1981)
GR0577
GR0577''RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1981
GR0577''RECOVERED IN GOOD CONDITION EXEPT MARK IS STAMPED V 4.
GR0577
GR0577                          STATION RECOVERY (1990)
GR0577
GR0577''RECOVERY NOTE BY US POWER SQUADRON 1990 (MG)
GR0577''RECOVERED IN GOOD CONDITION.
GR0577
GR0577                          STATION RECOVERY (1996)
GR0577
GR0577''RECOVERY NOTE BY US POWER SQUADRON 1996
GR0577''RECOVERED IN GOOD CONDITION.