BL1166 - "Q 88" bench mark disk - Conroe, TX
Posted by: Groundspeak Premium Member Raven
N 30° 15.759 W 095° 27.356
15R E 263721 N 3350442
This benchmark is located near the railroad tracks south of Crighton Road (and a little of East of I-45) just south of Conroe, Texas.
Waymark Code: WM11G0D
Location: Texas, United States
Date Posted: 10/17/2019
Published By:Groundspeak Premium Member Ernmark
Views: 3
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As described by the NGS in 1973 (although already monumented by the CGS back in 1932):

"[...] 45.8 FEET EAST OF THE EAST RAIL, 0.8 FOOT WEST OF A METAL WITNESS POST, AND ABOUT 3 FEET BELOW THE LEVEL OF THE RAIL, SET IN THE TOP OF A CONCRETE POST PROJECTING 0.3 FOOT."

Save for witness post (it's now now just wooden survey stake), the NGS description is still pretty accurate -- and so is the distance estimate.

The NGS' currently posted coordinates ("N 30 15 45.51 W 095 27 21.39") seemed reasonably accurate as well: my measurements were "N 30° 15.759 W 095° 27.356" 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)

BL1166 ***********************************************************************
BL1166 DESIGNATION - Q 88
BL1166 PID - BL1166
BL1166 STATE/COUNTY- TX/MONTGOMERY
BL1166 COUNTRY - US
BL1166 USGS QUAD - CONROE (1976)
BL1166
BL1166 *CURRENT SURVEY CONTROL
BL1166 ______________________________________________________________________
BL1166* NAD 83(1986) POSITION- 30 15 45.51 (N) 095 27 21.39 (W) HD_HELD1
BL1166* NAVD 88 ORTHO HEIGHT - 39.672 (meters) 130.16 (feet) ADJUSTED
BL1166 ______________________________________________________________________
BL1166 GEOID HEIGHT - -27.542 (meters) GEOID18
BL1166 DYNAMIC HEIGHT - 39.619 (meters) 129.98 (feet) COMP
BL1166 MODELED GRAVITY - 979,310.0 (mgal) NAVD 88
BL1166 OBS GRAVITY - 979,309.9 (mgal) GRAV_OBS
BL1166 VERT ORDER - FIRST CLASS I
BL1166
BL1166_MARKER: DB = BENCH MARK DISK
BL1166_SETTING: 7 = SET IN TOP OF CONCRETE MONUMENT
BL1166_STAMPING: Q 88 1932 130.991
BL1166_MARK LOGO: CGS
BL1166_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
BL1166+STABILITY: SURFACE MOTION
BL1166_SATELLITE: THE SITE LOCATION WAS REPORTED AS SUITABLE FOR
BL1166+SATELLITE: SATELLITE OBSERVATIONS - March 24, 2015
BL1166
BL1166 HISTORY - Date Condition Report By
BL1166 HISTORY - 1932 MONUMENTED CGS
BL1166 HISTORY - 1973 GOOD NGS
BL1166 HISTORY - 1978 GOOD NGS
BL1166 HISTORY - 1987 GOOD NGS
BL1166 HISTORY - 20040918 MARK NOT FOUND USPSQD
BL1166 HISTORY - 20111230 GOOD GEOCAC
BL1166 HISTORY - 20150324 GOOD INDIV
Condition: Mark found in good condition

Designation: Q 88 (or "Q88 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): Conroe

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: BL1166

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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Raven visited BL1166 - "Q 88" bench mark disk - Conroe, TX 08/30/2019 Raven visited it