A 77

*CURRENT SURVEY CONTROL (Retrieval Date = December 8, 1998)

* NAD 83(1993)- 40 59 52.39735(N) 105 24 43.22543(W) ADJUSTED

* NAVD 88 - 2298.816 (meters) 7542.03 (feet) ADJUSTED

X - -1,281,610.842 (meters) COMP
Y - -4,649,053.179 (meters) COMP
Z - 4,163,746.154 (meters) COMP

LAPLACE CORR- -12.33 (seconds) DEFLEC96
ELLIP HEIGHT- 2286.41 (meters) GPS OBS
GEOID HEIGHT- -12.52 (meters) GEOID96
DYNAMIC HT - 2296.696 (meters) 7535.08 (feet) COMP
MODELED GRAV- 979,618.1 (mgal) NAVD 88
HORZ ORDER - B
VERT ORDER - SECOND CLASS 0
ELLP ORDER - FOURTH CLASS I

The horizontal coordinates were established by GPS observations and adjusted by the National Geodetic Survey in October 1994.

The orthometric height was determined by differential leveling and adjusted by the National Geodetic Survey in June 1991.

The X, Y, and Z were computed from the position and the ellipsoidal ht.

The Laplace correction was computed from DEFLEC96 derived deflections.

The ellipsoidal height was determined by GPS observations and is referenced to NAD 83.

The geoid height was determined by GEOID96.

The dynamic height is computed by dividing the NAVD 88 geopotential number by the normal gravity value computed on the Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45 degrees latitude (G = 980.6199 gals.).

The modeled gravity was interpolated from observed gravity values.

North East Units Scale Converg.

SPC WY E - 55,315.547 179,358.863 MT 0.99994274 -0 09 39.4
UTM 13 - 4,538,604.361 465,348.427 MT 0.99961478 -0 16 13.1

Superseded Survey Control

NGVD 29 - 2297.683 (m) 7538.31 (f) ADJ UNCH 2 0

Superseded values are not recommended for survey control. NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums. See file format.dat to determine how the superseded data were derived.

MARKER: DB = BENCH MARK DISK
SETTING: 66 = SET IN ROCK OUTCROP
STAMPING: A 77 1934
STABILITY: A = Most reliable and expected to hold position/elevation well
SATELLITE: The site location was reported as suitable for satellite observations - February 21, 1997

HISTORY - Date Condition Recov. By

HISTORY - 1934 MONUMENTED CGS

HISTORY - 19931102 GOOD NGS

HISTORY - 19970221 GOOD CODOT

Station Description

DESCRIBED BY COAST AND GEODETIC SURVEY 1934 4.8 MI NW FROM VIRGINIA DALE. IN ALBANY COUNTY, WYOMING, 4.8 MILES NORTHWEST ALONG U.S. HIGHWAY 287 FROM THE POST OFFICE AT VIRGINIA DALE, LARIMER COUNTY, COLORADO, 130 FEET EAST OF THE INTERSECTION OF THE COLORADO-WYOMING STATE LINE, 105 FEET EAST OF THE OVERLAND STAGE MONUMENT, 75 FEET NORTH OF THE STATE LINE SERVICE STATION, AT THE EXTREME WEST EDGE OF A ROCK OUTCROP, IN THE CENTER OF THE TOP OF THE ROCK, AND 1 FOOT ABOVE GROUND. A STANDARD DISK, STAMPED A 77 1934.

Station Recovery (1993)

RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1993 (RSC) THE STATION IS LOCATED ABOUT 40.2 KM (24.95 MI) SOUTH-SOUTHEAST OF LARAMIE, WY, 14.5 KM (9.00 MI) SOUTH-SOUTHEAST OF TIE SIDING, WY, 6.4 KM (3.95 MI) NORTHWEST OF VIRGINIA DALE, CO AND ON THE WYOMING-COLORADO STATE LINE, AT U.S. HIGHWAY 287 MILEPOST (COLORADO) 425.42, IN THE NORTHEAST 1/4 OF SECTION 24, T 12 N, R 72 W. OWNERSHIP--WYOMING DEPT. OF TRANSPORTATION RIGHT-OF-WAY. TO REACH THE STATION, GO TO THE COLORADO-WYOMING STATE LINE ON U.S. HIGHWAY 287 AND THE MARK ON THE NORTH SIDE OF THE STATE LINE CAFE BUILDING. THE MARK IS A STANDARD DISK SET IN A DRILL HOLE IN THE EASTERN CENTER OF A ROCK OUTCROP 2.4 M (7.9 FT) BY 5.2 M, AND PROJECTING ABOUT 0.3 M. IT IS 36.4 M (119.4 FT) EAST OF THE CENTER LINE OF U. S. HIGHWAY 287, 21.6 M (70.9 FT) EAST OF THE OVERLAND STAGE LINE MARKER, 17.5 M (57.4 FT) NORTHEAST OF THE NORTHEAST CORNER OF THE STATE LINE CAFE, 10.9 M (35.8 FT) WEST OF A RIGHT-OF-WAY MARKER AND 2.0 M (6.6 FT) EAST OF A WITNESS POST.

Station Recovery (1997)

RECOVERY NOTE BY COLORADO DEPARTMENT OF TRANSPORTATION 1997 (RSC) RECOVERED AS DESCRIBED.