GR0586 ***********************************************************************
GR0586  DESIGNATION -  Q 135
GR0586  PID         -  GR0586
GR0586  STATE/COUNTY-  AZ/MOHAVE
GR0586  USGS QUAD   -  HOOVER DAM (1984)
GR0586
GR0586                         *CURRENT SURVEY CONTROL
GR0586  ___________________________________________________________________
GR0586* NAD 83(1986)-  36 00 57.     (N)    114 44 13.     (W)     SCALED
GR0586* NAVD 88     -       376.381  (meters)    1234.84   (feet)  ADJUSTED
GR0586  ___________________________________________________________________
GR0586  GEOID HEIGHT-         -28.26  (meters)                     GEOID99
GR0586  DYNAMIC HT  -         376.012 (meters)    1233.63  (feet)  COMP
GR0586  MODELED GRAV-     979,643.0   (mgal)                       NAVD 88
GR0586
GR0586  VERT ORDER  -  FIRST     CLASS I
GR0586
GR0586.The horizontal coordinates were scaled from a topographic map and have
GR0586.an estimated accuracy of +/- 6 seconds.
GR0586
GR0586.The orthometric height was determined by differential leveling
GR0586.and adjusted by the National Geodetic Survey in June 1991.
GR0586
GR0586.The geoid height was determined by GEOID99.
GR0586
GR0586.The dynamic height is computed by dividing the NAVD 88
GR0586.geopotential number by the normal gravity value computed on the
GR0586.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
GR0586.degrees latitude (G = 980.6199 gals.).
GR0586
GR0586.The modeled gravity was interpolated from observed gravity values.
GR0586
GR0586;                    North         East    Units  Estimated Accuracy
GR0586;SPC AZ W     -   556,740.      124,400.      MT  (+/- 180 meters Scaled)
GR0586
GR0586                          SUPERSEDED SURVEY CONTROL
GR0586
GR0586  NGVD 29     -       375.663  (m)         1232.49   (f) ADJ UNCH    1 1
GR0586
GR0586.Superseded values are not recommended for survey control.
GR0586.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
GR0586.See file dsdata.txt to determine how the superseded data were derived.
GR0586
GR0586_MARKER: DB = BENCH MARK DISK
GR0586_SETTING: 30 = GUARD RAIL
GR0586_STAMPING: Q 135 1935
GR0586_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
GR0586
GR0586  HISTORY     - Date     Condition        Recov. By
GR0586  HISTORY     - 1935     MONUMENTED       CGS
GR0586  HISTORY     - 1950     GOOD             NGS
GR0586  HISTORY     - 1963     GOOD             NGS
GR0586  HISTORY     - 1981     GOOD             NGS
GR0586  HISTORY     - 1990     GOOD             USPSQD
GR0586
GR0586                          STATION DESCRIPTION
GR0586
GR0586''DESCRIBED BY NATIONAL GEODETIC SURVEY 1950
GR0586''IN HOOVER DAM.
GR0586''ON TOP OF HOOVER DAM, 31.4 FEET SOUTHEAST OF THE CENTER, NEAR THE
GR0586''CENTER OF THE NORTHEAST (UPSTREAM) SIDE OF BLOCK J, IN THE TOP OF THE
GR0586''SOUTHWEST EDGE OF THE NORTHEAST SIDEWALK, AND 3.4 FEET SOUTHWEST OF
GR0586''THE NORTHEAST CONCRETE GUARD RAIL.
GR0586
GR0586                          STATION RECOVERY (1963)
GR0586
GR0586''RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1963
GR0586''RECOVERED IN GOOD CONDITION.
GR0586
GR0586                          STATION RECOVERY (1981)
GR0586
GR0586''RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1981
GR0586''RECOVERED IN GOOD CONDITION.
GR0586
GR0586                          STATION RECOVERY (1990)
GR0586
GR0586''RECOVERY NOTE BY US POWER SQUADRON 1990 (MG)
GR0586''RECOVERED IN GOOD CONDITION.