GR0593 ***********************************************************************
GR0593  DESIGNATION -  T 135
GR0593  PID         -  GR0593
GR0593  STATE/COUNTY-  AZ/MOHAVE
GR0593  USGS QUAD   -  HOOVER DAM (1984)
GR0593
GR0593                         *CURRENT SURVEY CONTROL
GR0593  ___________________________________________________________________
GR0593* NAD 83(1986)-  36 00 53.     (N)    114 44 12.     (W)     SCALED
GR0593* NAVD 88     -       376.416  (meters)    1234.96   (feet)  ADJUSTED
GR0593  ___________________________________________________________________
GR0593  GEOID HEIGHT-         -28.26  (meters)                     GEOID99
GR0593  DYNAMIC HT  -         376.047 (meters)    1233.75  (feet)  COMP
GR0593  MODELED GRAV-     979,642.4   (mgal)                       NAVD 88
GR0593
GR0593  VERT ORDER  -  FIRST     CLASS I
GR0593
GR0593.The horizontal coordinates were scaled from a topographic map and have
GR0593.an estimated accuracy of +/- 6 seconds.
GR0593
GR0593.The orthometric height was determined by differential leveling
GR0593.and adjusted by the National Geodetic Survey in June 1991.
GR0593
GR0593.The geoid height was determined by GEOID99.
GR0593
GR0593.The dynamic height is computed by dividing the NAVD 88
GR0593.geopotential number by the normal gravity value computed on the
GR0593.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
GR0593.degrees latitude (G = 980.6199 gals.).
GR0593
GR0593.The modeled gravity was interpolated from observed gravity values.
GR0593
GR0593;                    North         East    Units  Estimated Accuracy
GR0593;SPC AZ W     -   556,620.      124,420.      MT  (+/- 180 meters Scaled)
GR0593
GR0593                          SUPERSEDED SURVEY CONTROL
GR0593
GR0593  NGVD 29     -       375.700  (m)         1232.61   (f) ADJ UNCH    1 1
GR0593
GR0593.Superseded values are not recommended for survey control.
GR0593.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
GR0593.See file dsdata.txt to determine how the superseded data were derived.
GR0593
GR0593_MARKER: DD = SURVEY DISK
GR0593_SETTING: 30 = SIDEWALK
GR0593_STAMPING: T 135 1935
GR0593_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
GR0593
GR0593  HISTORY     - Date     Condition        Recov. By
GR0593  HISTORY     - 1935     MONUMENTED       BOR
GR0593  HISTORY     - 1950     GOOD             NGS
GR0593  HISTORY     - 1963     GOOD             NGS
GR0593  HISTORY     - 1981     GOOD             NGS
GR0593  HISTORY     - 1990     GOOD             USPSQD
GR0593  HISTORY     - 1990     GOOD             USPSQD
GR0593
GR0593                          STATION DESCRIPTION
GR0593
GR0593''DESCRIBED BY NATIONAL GEODETIC SURVEY 1950
GR0593''IN HOOVER DAM.
GR0593''ON TOP OF HOOVER DAM, 15.7 FEET NORTH OF THE SOUTHEAST (ARIZONA) END,
GR0593''22.7 FEET SOUTH OF THE SOUTH EDGE OF A STAIRWAY NICHE, AT THE
GR0593''SOUTHWEST CORNER OF BLOCK A, IN THE TOP OF THE WEST (DOWNSTREAM)
GR0593''SIDEWALK, AND 0.6 FOOT EAST OF THE WEST GUARD RAIL.
GR0593
GR0593                          STATION RECOVERY (1963)
GR0593
GR0593''RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1963
GR0593''RECOVERED IN GOOD CONDITION.
GR0593
GR0593                          STATION RECOVERY (1981)
GR0593
GR0593''RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1981
GR0593''RECOVERED IN GOOD CONDITION.
GR0593
GR0593                          STATION RECOVERY (1990)
GR0593
GR0593''RECOVERY NOTE BY US POWER SQUADRON 1990 (MG)
GR0593''RECOVERED IN GOOD CONDITION.
GR0593
GR0593                          STATION RECOVERY (1990)
GR0593
GR0593''RECOVERY NOTE BY US POWER SQUADRON 1990 (GG)
GR0593''RECOVERED IN GOOD CONDITION.