CV4717 - "MARBLE FALLS RM 2" reference mark disk - Marble Falls, TX
Posted by: Groundspeak Premium Member Raven
N 30° 34.418 W 098° 15.862
14R E 570539 N 3382581
Quick Description: This benchmark is located in a fenced-in area around an old 1956 water tank (which itself is a NGS benchmark as well: BN0599) on Villa Viejo at the eastern edge of Marble Falls, TX.
Location: Texas, United States
Date Posted: 4/23/2015 7:18:32 AM
Waymark Code: WMNR5V
Published By: Groundspeak Premium Member Ernmark
Views: 1

Long Description:
As described by the CGS in 1956 in reference to its associated Triangulation Station Disk (BN0600, which was noted as "Mark Not Found" in 2005):

"THE STATION IS LOCATED ABOUT 1/2 MILE NORTHEAST OF MARBLE FALLS AND ADJACENT TO THE NORTHEAST MUNICIPAL WATER TANK.
[...] REFERENCE MARK 2 IS SET IN A DRILL HOLE IN THE CONCRETE FOUNDATION OF THE TANK, AND THE DISK IS STAMPED MARBLE FALLS NO 2 1956.
[...] TO REACH THE MARK FROM THE JUNCTION OF U.S. HIGHWAY 281 AND FARM ROAD 1431, GO NORTH ON HIGHWAY 281 FOR 0.2 MILE TO THE MARK ON THE RIGHT."

The 1956 description and associated reference points (i.e. distances/directions) are still decent references for locating this station, although some clarifications might be in order to simplify future recovery attempts:

* The "NORTHEAST MUNICIPAL WATER TANK" is located on Villa Viejo, just south of its intersection of FM-1431 and .42 miles EAST (not NORTH) from the junction of FM-1431 and US Hwy 281.

* The water tank in question is a NGS Benchmark itself as well: BN0599 ("MARBLE FALLS NE MUN TANK 1956").

* As stated in the 1956 narrative, this particular Reference Mark is set on top of the water tank's concrete foundation -- just by the outside rim of the water tank.

The entire water tank area is fenced off, and as such it is not possible to inspect the disk up close... that said, zoomed in images taken from 20-25' west of the station clearly indicate that the disk is a CGS reference mark (along with the usual stamped arrow pointing to the presumably defunct Triangulation Station) and seemed to be in good condition -- despite having been slightly painted over.

Since the area is fenced off, it is equally not possible to accurately measure its precise coordinates. However, based on readings from the fence line (as measured within 10' accuracy and 10+ reading averages), is it calculated that its coordinates should be close to "N 30° 34.418 W 098° 15.862"

For an unknown reason, no NGS Data Sheet was found for "CV4717", however its existence is clearly referenced in the data sheet of its associated Triangulation Station: (visit link)

BN0600|---------------------------------------------------------------------|
BN0600| PID Reference Object Distance Geod. Az |
BN0600| dddmmss.s |
BN0600| CV4716 MARBLE FALLS RM 1 8.059 METERS 06910 |
BN0600| BN0599 MARBLE FALLS NE MUN TANK 1956 10.718 METERS 10916 |
BN0600| CV4717 MARBLE FALLS RM 2 6.887 METERS 12519 |
BN0600| BN0596 MARBLE FALLS SW MUNICIPAL TANK APPROX. 1.3 KM 2444050.4 |
BN0600| CV4715 MARBLE FALLS AZ MK 3161917.8 |
BN0600|---------------------------------------------------------------------|
Condition: Mark found in good condition

Designation: MARBLE FALLS RM 2 (presumably!)

Benchmark Agency: U.S. Coast & Geodetic Survey

Monumentation type: REFERENCE MARK disk

County: Marble Falls (Burnet County)

USGS 7.5' Topographic Quadrangle Name: Marble Falls

Find type: Found by luck/skill/knowledge

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

NGS PID: CV4717 (as noted in the NGS Data Sheet for BN0600)

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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