ME1856 ***********************************************************************
ME1856  DESIGNATION -  J 137
ME1856  PID         -  ME1856
ME1856  STATE/COUNTY-  IL/COOK
ME1856  USGS QUAD   -  SAG BRIDGE (1997)
ME1856
ME1856                         *CURRENT SURVEY CONTROL
ME1856  ___________________________________________________________________
ME1856* NAD 83(1986)-  41 41 14.     (N)    087 54 56.     (W)     SCALED
ME1856* NAVD 88     -       188.949  (meters)     619.91   (feet)  ADJUSTED
ME1856  ___________________________________________________________________
ME1856  GEOID HEIGHT-         -33.20  (meters)                     GEOID99
ME1856  DYNAMIC HT  -         188.880 (meters)     619.68  (feet)  COMP
ME1856  MODELED GRAV-     980,252.7   (mgal)                       NAVD 88
ME1856
ME1856  VERT ORDER  -  FIRST     CLASS II
ME1856
ME1856.The horizontal coordinates were scaled from a topographic map and have
ME1856.an estimated accuracy of +/- 6 seconds.
ME1856
ME1856.The orthometric height was determined by differential leveling
ME1856.and adjusted by the National Geodetic Survey in June 1991.
ME1856
ME1856.The geoid height was determined by GEOID99.
ME1856
ME1856.The dynamic height is computed by dividing the NAVD 88
ME1856.geopotential number by the normal gravity value computed on the
ME1856.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
ME1856.degrees latitude (g = 980.6199 gals.).
ME1856
ME1856.The modeled gravity was interpolated from observed gravity values.
ME1856
ME1856;                    North         East    Units  Estimated Accuracy
ME1856;SPC IL E     -   557,450.      334,780.      MT  (+/- 180 meters Scaled)
ME1856
ME1856                          SUPERSEDED SURVEY CONTROL
ME1856
ME1856  NGVD 29     -       189.037  (m)          620.20   (f) ADJ UNCH    1 2
ME1856
ME1856.Superseded values are not recommended for survey control.
ME1856.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
ME1856.See file dsdata.txt to determine how the superseded data were derived.
ME1856
ME1856_MARKER: DB = BENCH MARK DISK
ME1856_SETTING: 30 = CULVERT
ME1856_STAMPING: J 137 1947
ME1856_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
ME1856
ME1856  HISTORY     - Date     Condition        Recov. By
ME1856  HISTORY     - 1947     MONUMENTED       CGS
ME1856  HISTORY     - 1971     GOOD             NGS
ME1856  HISTORY     - 1977     GOOD             NGS
ME1856
ME1856                          STATION DESCRIPTION
ME1856
ME1856''DESCRIBED BY COAST AND GEODETIC SURVEY 1947
ME1856''13.1 MI NW FROM BLUE ISLAND.
ME1856''ABOUT 13.1 MILES NORTHWEST ALONG STATE HIGHWAY 83 FROM THE
ME1856''GRAND TRUNK AND WESTERN RAILROAD STATION AT BLUE ISLAND, ABOUT 1.25
ME1856''MILE SOUTHEAST OF THE BRIDGE OVER CALUMET SAG, ABOUT 0.9 MILE EAST
ME1856''OF THE INTERSECTION OF ARCHER AVENUE, SET IN THE TOP OF THE CENTER
ME1856''OF THE SOUTH HEAD WALL OF A 3-FOOT CONCRETE BOX CULVERT UNDER THE
ME1856''HIGHWAY, DIRECTLY ACROSS THE HIGHWAY FROM A LIMESTONE ROCK BED,
ME1856''31 FEET SOUTH OF AND ABOUT 0.5 FOOT BELOW THE CENTER LINE OF THE
ME1856''HIGHWAY.
ME1856
ME1856                          STATION RECOVERY (1971)
ME1856
ME1856''RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971
ME1856''RECOVERED IN GOOD CONDITION.
ME1856
ME1856                          STATION RECOVERY (1977)
ME1856
ME1856''RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1977
ME1856''RECOVERED IN GOOD CONDITION.