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BL1173 - "T 88" bench mark disk - Oak Ridge North, TX
Posted by: Groundspeak Premium Member Raven
N 30° 10.946 W 095° 26.555
15R E 264815 N 3341522
Quick Description: This benchmark is located near the railroad tracks just west of Old Hardy Road near Oak Ridge North (a community just north of Spring), Texas.
Location: Texas, United States
Date Posted: 10/17/2019 8:21:26 AM
Waymark Code: WM11FYX
Published By: Groundspeak Premium Member Ernmark
Views: 0

Long Description:
As described by the NGS in 1973 (although already monumented by the CGS back in 1932):

"[...] 103 FEET SOUTH OF A POWER POLE SUPPORTING 3 TRANSFORMERS (NO. 13481), 53 FEET WEST OF THE CENTER LINE OF A GRAVEL ROAD, 45 FEET EAST OF THE EAST RAIL, 1.2 FEET NORTH OF A METAL WITNESS POST, AND ABOUT 1 FOOT BELOW THE LEVEL OF THE RAIL, SET IN THE TOP OF A CONCRETE POST PROJECTING 0.2 FOOT."

Save for the mention of the "GRAVEL ROAD" (it's now paved, and called "Old Hardy Road"), the NGS description is still pretty accurate, and so are the distance estimates from the rail tracks and the street... The witness post is still there as well.

The NGS' currently posted coordinates ("N 30 10 56.76 W 095 26 33.18") seemed reasonably accurate: my measurements were "N 30° 10.946 W 095° 26.555" based on 10+ readings within 10' accuracy.

The station was recovered in good condition.

---

Below are some basic additional facts, per the NGS database (with some editing for length): (visit link)

BL1173 ***********************************************************************
BL1173 DESIGNATION - T 88
BL1173 PID - BL1173
BL1173 STATE/COUNTY- TX/MONTGOMERY
BL1173 COUNTRY - US
BL1173 USGS QUAD - TAMINA (1979)
BL1173
BL1173 *CURRENT SURVEY CONTROL
BL1173 ______________________________________________________________________
BL1173* NAD 83(1986) POSITION- 30 10 56.76 (N) 095 26 33.18 (W) HD_HELD1
BL1173* NAVD 88 ORTHO HEIGHT - 39.597 (meters) 129.91 (feet) ADJUSTED
BL1173 ______________________________________________________________________
BL1173 GEOID HEIGHT - -27.535 (meters) GEOID18
BL1173 DYNAMIC HEIGHT - 39.544 (meters) 129.74 (feet) COMP
BL1173 MODELED GRAVITY - 979,306.2 (mgal) NAVD 88
BL1173 OBS GRAVITY - 979,306.6 (mgal) GRAV_OBS
BL1173 VERT ORDER - FIRST CLASS I
BL1173
BL1173_MARKER: DB = BENCH MARK DISK
BL1173_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
BL1173_STAMPING: T 88 1932 131.020
BL1173_MARK LOGO: CGS
BL1173_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
BL1173+STABILITY: SURFACE MOTION
BL1173_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
BL1173+SATELLITE: SATELLITE OBSERVATIONS - September 29, 2005
BL1173
BL1173 HISTORY - Date Condition Report By
BL1173 HISTORY - 1932 MONUMENTED CGS
BL1173 HISTORY - 1973 GOOD NGS
BL1173 HISTORY - 1978 GOOD NGS
BL1173 HISTORY - 1987 GOOD NGS
BL1173 HISTORY - 20040226 GOOD ENGLE
BL1173 HISTORY - 20050929 GOOD USPSQD
Condition: Mark found in good condition

Designation: T 88 (or "T88 1932", if one goes by the actual stamping)

Benchmark Agency: U.S. Coast & Geodetic Survey

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

County: Montgomery county, Texas

USGS 7.5' Topographic Quadrangle Name (optional): Tamina

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: BL1173

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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Recent Visits/Logs:
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Raven visited BL1173 - "T 88" bench mark disk - Oak Ridge North, TX 8/28/2019 Raven visited it