BO0116 B 104 -- Sonora TX
Posted by: Groundspeak Premium Member Benchmark Blasterz
N 30° 34.332 W 100° 38.622
14R E 342375 N 3383342
The US benchmark at the west entry to the Sutton County Courthouse in downtown Sonora TX
Waymark Code: WMPPXQ
Location: Texas, United States
Date Posted: 10/04/2015
Published By:Groundspeak Premium Member Ernmark
Views: 1

This benchmark is easily spotted, since it is set vertically on the front face of the entry at the west side of the Sutton County Courthouse oin downtown Sonora TX.

From the NGS datasheet:

"BO0116 DESIGNATION - B 104
BO0116 PID - BO0116
BO0116 STATE/COUNTY- TX/SUTTON
BO0116 USGS QUAD - SONORA (1983)
BO0116
BO0116 *CURRENT SURVEY CONTROL
BO0116 ___________________________________________________________________
BO0116* NAD 83(1986)- 30 34 19. (N) 100 38 38. (W) SCALED
BO0116* NAVD 88 - 657.733 (meters) 2157.91 (feet) ADJUSTED
BO0116 ___________________________________________________________________
BO0116 GEOID HEIGHT- -22.86 (meters) GEOID99
BO0116 DYNAMIC HT - 656.768 (meters) 2154.75 (feet) COMP
BO0116 MODELED GRAV- 979,153.8 (mgal) NAVD 88
BO0116
BO0116 VERT ORDER - FIRST CLASS II
BO0116
BO0116.The horizontal coordinates were scaled from a topographic map and have
BO0116.an estimated accuracy of +/- 6 seconds.
BO0116
BO0116.The orthometric height was determined by differential leveling
BO0116.and adjusted by the National Geodetic Survey in June 1991.
BO0116
BO0116.The geoid height was determined by GEOID99.
BO0116
BO0116.The dynamic height is computed by dividing the NAVD 88
BO0116.geopotential number by the normal gravity value computed on the
BO0116.Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45
BO0116.degrees latitude (G = 980.6199 gals.).
BO0116
BO0116.The modeled gravity was interpolated from observed gravity values.
BO0116
BO0116; North East Units Estimated Accuracy
BO0116;SPC TX C - 3,100,400. 670,210. MT (+/- 180 meters Scaled)
BO0116
BO0116 SUPERSEDED SURVEY CONTROL
BO0116
BO0116 NGVD 29 - 657.542 (m) 2157.29 (f) ADJ UNCH 1 2
BO0116
BO0116.Superseded values are not recommended for survey control.
BO0116.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums.
BO0116.See file dsdata.txt to determine how the superseded data were derived.
BO0116
BO0116_MARKER: DB = BENCH MARK DISK
BO0116_SETTING: 30 = STEP
BO0116_STAMPING: B 104 1932
BO0116_STABILITY: D = MARK OF QUESTIONABLE OR UNKNOWN STABILITY
BO0116
BO0116 HISTORY - Date Condition Recov. By
BO0116 HISTORY - 1932 MONUMENTED CGS
BO0116 HISTORY - 1958 GOOD NGS
BO0116
BO0116 STATION DESCRIPTION
BO0116
BO0116''DESCRIBED BY NATIONAL GEODETIC SURVEY 1958
BO0116''IN SONORA.
BO0116''AT SONORA, AT THE COUNTY COURTHOUSE, SET VERTICALLY IN THE WEST FACE
BO0116''OF THE SOUTH STONE RAILING OF THE STEPS, 5 FEET SOUTH OF THE CENTER
BO0116''LINE OF THE WEST ENTRANCE, ABOUT 6 INCHES ABOVE THE BOTTOM STONE STEP."
Condition: Mark found in good condition

Designation: B 104

Benchmark Agency: U.S. Coast & Geodetic Survey

Monumentation type: BENCH MARK (or B.M.) Disk

County: Sutton Co. TX

USGS 7.5' Topographic Quadrangle Name (optional): Sonora

Find type: Coordinates and/or to-reach information from the NGS database (or Geocaching's copy of it) were used

Web address of this benchmark's datasheet (optional): [Web Link]

NGS PID: BO0116

Benchmark Agency (if other): Not listed

Monumentation type (if other): Not listed

Special category (optional): Not listed

Special Category (if other): Not listed

Local database's URL (optional): Not listed

Visit Instructions:
  1. A closeup photo of the mark taken by you is required.
  2. A 'distant' photo including the mark in the view is highly recommended. Include the compass direction you faced when you took the picture.
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Benchmark Blasterz visited BO0116 B 104 -- Sonora TX 07/23/2015 Benchmark Blasterz visited it