GR0590 ***********************************************************************
GR0590  DESIGNATION -  S 135
GR0590  PID         -  GR0590
GR0590  STATE/COUNTY-  AZ/MOHAVE
GR0590  USGS QUAD   -  HOOVER DAM (1984)
GR0590
GR0590                         *CURRENT SURVEY CONTROL
GR0590  ___________________________________________________________________
GR0590* NAD 83(1986)-  36 00 54.     (N)    114 44 12.     (W)     SCALED
GR0590* NAVD 88     -       376.386  (meters)    1234.86   (feet)  ADJUSTED
GR0590  ___________________________________________________________________
GR0590  GEOID HEIGHT-         -28.26  (meters)                     GEOID99
GR0590  DYNAMIC HT  -         376.017 (meters)    1233.65  (feet)  COMP
GR0590  MODELED GRAV-     979,642.5   (mgal)                       NAVD 88
GR0590
GR0590  VERT ORDER  -  FIRST     CLASS I
GR0590
GR0590.The horizontal coordinates were scaled from a topographic map and have
GR0590.an estimated accuracy of +/- 6 seconds.
GR0590
GR0590.The orthometric height was determined by differential leveling
GR0590.and adjusted by the National Geodetic Survey in June 1991.
GR0590
GR0590.The geoid height was determined by GEOID99.
GR0590
GR0590.The dynamic height is computed by dividing the NAVD 88
GR0590.geopotential number by the normal gravity value computed on the
GR0590.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
GR0590.degrees latitude (G = 980.6199 gals.).
GR0590
GR0590.The modeled gravity was interpolated from observed gravity values.
GR0590
GR0590;                    North         East    Units  Estimated Accuracy
GR0590;SPC AZ W     -   556,650.      124,420.      MT  (+/- 180 meters Scaled)
GR0590
GR0590                          SUPERSEDED SURVEY CONTROL
GR0590
GR0590  NGVD 29     -       375.670  (m)         1232.51   (f) ADJ UNCH    1 1
GR0590
GR0590.Superseded values are not recommended for survey control.
GR0590.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
GR0590.See file dsdata.txt to determine how the superseded data were derived.
GR0590
GR0590_MARKER: DB = BENCH MARK DISK
GR0590_SETTING: 30 = SIDWALK
GR0590_STAMPING: S 135 1935
GR0590_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
GR0590
GR0590  HISTORY     - Date     Condition        Recov. By
GR0590  HISTORY     - 1935     MONUMENTED       CGS
GR0590  HISTORY     - 1950     GOOD             NGS
GR0590  HISTORY     - 1963     GOOD             NGS
GR0590  HISTORY     - 1981     GOOD             NGS
GR0590  HISTORY     - 1990     GOOD             USPSQD
GR0590  HISTORY     - 1990     GOOD             USPSQD
GR0590
GR0590                          STATION DESCRIPTION
GR0590
GR0590''DESCRIBED BY NATIONAL GEODETIC SURVEY 1950
GR0590''IN HOOVER DAM.
GR0590''ON TOP OF HOOVER DAM, ABOUT 75 YARDS NORTH OF THE SOUTHEAST (ARIZONA)
GR0590''END, DIRECTLY ACROSS THE ROADWAY FROM THE ARIZONA REST ROOM TOWER,
GR0590''NEAR THE CENTER OF THE EAST (UPSTREAM) SIDE OF BLOCK D, IN THE TOP OF
GR0590''THE EAST CONCRETE SIDEWALK, 0.4 FOOT EAST OF THE WEST EDGE, AND 3.5
GR0590''FEET WEST OF THE EAST GUARD RAIL.
GR0590
GR0590                          STATION RECOVERY (1963)
GR0590
GR0590''RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1963
GR0590''RECOVERED IN GOOD CONDITION.
GR0590
GR0590                          STATION RECOVERY (1981)
GR0590
GR0590''RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1981
GR0590''RECOVERED IN GOOD CONDITION.
GR0590
GR0590                          STATION RECOVERY (1990)
GR0590
GR0590''RECOVERY NOTE BY US POWER SQUADRON 1990 (MG)
GR0590''RECOVERED IN GOOD CONDITION.
GR0590
GR0590                          STATION RECOVERY (1990)
GR0590
GR0590''RECOVERY NOTE BY US POWER SQUADRON 1990 (GG)
GR0590''RECOVERED IN GOOD CONDITION.