BL2156 - CORRIGAN MUNICIPAL TANK - Corrigan, TX
Posted by: Groundspeak Premium Member Raven
N 30° 59.911 W 094° 49.599
15R E 325600 N 3430869
The ball at the apex of the roof of the old water tank in downtown Corrigan, TX is a NGS benchmark ("BL2156"). A more "standard" benchmark is located at the base of its northwestern leg.
Waymark Code: WMTBH2
Location: Texas, United States
Date Posted: 10/28/2016
Published By:Groundspeak Premium Member NW_history_buff
Views: 1

As described by the Coast and Geodetic Survey ("CGS") back in 1949:

THE STATION IS LOCATED 0.05 MILE EAST OF THE RAILROAD DEPOT IN CORRIGAN, ABOUT 150 FEET EAST OF THE CENTER OF U.S. HIGHWAY NO. 59, AND 74 FEET NORTH OF THE CENTER OF A GRADED STREET.

THE TANK PROPER IS CONSTRUCTED OF STEEL AND HAS A DOME SHAPED ROOF WITH A BALL AT ITS TOP. IT IS SUPPORTED BY A FOUR LEGGED STEEL TRUSSWORK AND HAS AN OVERALL HEIGHT OF ABOUT 110 FEET.

THE POINT OBSERVED UPON WAS THE BALL AT THE TOP OF THE ROOF."

The CGS description is pretty accurate (save for "GRADED STREET" 74 feet South of the tank; that street is no longer in use), and so are the associated NGS Data Sheet's coordinates. This benchmark is actually hard to miss when in the general vicinity, as long as you don't get TOO close to the tank in question (so that you can still spot the actual reference point, namely the ball at the top of the metal tank).

While the water tower is not that interesting for a "benchmark recovery" perspective, there's another NGS benchmark to be found at the base of the tower's northwestern leg: BL0602 ("A 883") -- it's a CGS benchmark disk.

---

Below are some additional facts on the NGS "municipal tank" benchmark in question, per the NGS database (with some editing for length): (visit link)

BL2156 ***********************************************************************
BL2156 DESIGNATION - CORRIGAN MUNICIPAL TANK
BL2156 PID - BL2156
BL2156 STATE/COUNTY- TX/POLK
BL2156 COUNTRY - US
BL2156 USGS QUAD - CORRIGAN (1984)
BL2156
BL2156 *CURRENT SURVEY CONTROL
BL2156 ______________________________________________________________________
BL2156* NAD 83(1993) POSITION- 30 59 54.65347(N) 094 49 35.92927(W) ADJUSTED
BL2156* NAVD 88 ORTHO HEIGHT - **(meters) **(feet)
BL2156 ______________________________________________________________________
BL2156
BL2156_MARKER: 53 = ELEVATED TANK
BL2156
BL2156 HISTORY - Date Condition Report By
BL2156 HISTORY - 1949 FIRST OBSERVED CGS
BL2156 HISTORY - 20040604 GOOD USPSQD
BL2156 HISTORY - 20050709 GOOD USPSQD
Condition: Mark found in good condition

Designation: CORRIGAN MUNICIPAL TANK

Benchmark Agency: U.S. Coast & Geodetic Survey

Monumentation type: Elevated Tank

County: Corrigan (Polk County)

USGS 7.5' Topographic Quadrangle Name (optional): Corrigan

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: BL2156

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 BL2156 - CORRIGAN MUNICIPAL TANK - Corrigan, TX 10/16/2016 Raven visited it