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Details for Benchmark: BM0580

N 30° 16.083 W 097° 44.650 (NAD 83)

Altitude: 502.44

Coordinates may not be exact. Altitude is ADJUSTED and location is SCALED. (more info)

Location:
In TRAVIS county, TX View Original Datasheet
Designation:
502.23 USGS=502.1=508
Marker Type:
NGS Benchmark
Setting:
setting not listed - see description
Stability:
Probably hold position/elevation well.

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Grabbing a couple of Benchmarks while walking around downtown. This is Benchmark find #11.

[Photos:]
photoBM0580
N 30° 16.112 W 097° 44.641

Found disk in fair condition.

[Photos:]
photoBM0580

Found on a weekend trip to Austin on the O Henry Hall

[Photos:]
photo
photo

Our 5th benchmark!

[Photos:]
photo

Found it during a walk on 6th street. Greetings from Romania.

GPS Reception is difficult down here, and the previously posted coordinates are a bit varied. Coordinates of N 30° 16.112 W 097° 44.638 appear most accurate on Google Maps, though GPS may vary. Fortunately, this one is easy to spot on the northeast corner of 6th and Colorado, on the western wall facing the street. This building is now known as the O Henry Hall.

[Photos:]
photoBM0580 - Disk
photoBM0580 - Building History
photoBM0580 - Setting

This capitol is rich in easy to find benchmarks. Found while visiting Austin and picking up virtuals on a business trip.

Found it while visiting downtown Austin today... The suggested revised coordinates and the descriptions in previous log entries truly helped on this one!

[Photos:]
photoBM0580 - 502.23 USGS=502.1=508 - 1
photoBM0580 - 502.23 USGS=502.1=508 - 2

Found this on my day walk at hot Austin.

[Photos:]
photoBM0580

I found this one!

Discovered while retrieving a nearby cache. Was in town for ACL.

Found this on a quest for thirteen puzzle caches in downtown Austin.

Found while strolling around Austin. Almost eye level.

[Photos:]
photoThe disk
photoThe disk mounted vertically on wall

Still there on the west face of the old Post Office at 6th & Colorado. The hardest part of locating this one was finding a place to park. N 30° 16.114 W 097° 44.672

[Photos:]
photoBM0580 / 502.23 / UNK-1933
The disk. It looks like the disk has been re struck as there are numbers above the 502.23. I didn't notice this when I took the photo so I will have to check it next time I am in Austin unless someone supplies the information when logging it.
photoBM0580 / 502.23 / UNK-1933
Looking south across 6th Street

Found this one during a break at a meeting.

[Photos:]
photoBM0580
N 30° 16.107 W 097° 44.667

Found! Good Condition. On wall as reported.
A Short walk east of BM0629.
My GPS reported the above cords. and an elevation of 609' ??? (I think my GPS elevation reading was off though.)

[Photos:]
photoBM0580

In good condition as described, despite some dents and such on the desk, although some of that almost looks like it was there before it was set/marked... Anyway, I used Team GeoDillo's coordinates again, thanks to them for adding those. It's helpful when someone does!

[Photos:]
photoBM0580
photoVertical setting on wall

I walk pass this all the time and never noticed it before.

Found it during a lunchtime bike ride in downtown Austin.
Easy to locate and seemed in good condition to me.

[Photos:]
photoBM0580
photoBM0580 setting
photoBM0580 location

Found during lunch break today.

[Photos:]
photoBM0580
photoBM0580 setting

Took advantage of a meeting in downtown today to grab the virtual caches around the capitol and my first NGS bench marks.

Found at the intersection of 6th and Colorado

[Photos:]
photoSetting

Easily visible from the intersection of Seventh and Lavaca.

Found this easily on a quick benchmark and Virtual Cache tour of the State Capital Area.

[Photos:]
photoBM0580 in Austin, Texas
Buffed up a little.
N 30° 16.112 W 097° 44.643

This was the last of five I found today. The benchmark is mounted vertically on the wall on the southwest corner of the building located on the northeast corner of Colorado and 6th Streets. The condition of the benchmark is fair with some marks, although you can easily read the 502.23 foot elevation.

Scott of Team GeoDillo

[Photos:]
photoBM0580 Vertically mounted on the wall of a building
photoBM0580 on the SW corner of the building

Documented History (by the NGS)

Unknown by USGS (MONUMENTED)
01/01/1933 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1933 IN AUSTIN. ON THE SOUTHWEST CORNER OF THE BUILDING FORMERLY OCCUPIED BY U.S. POST OFFICE, AT THE CORNER OF SIXTH AND COLORADO STREETS AND FACING COLORADO STREET.
01/01/1953 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1953 RECOVERED IN GOOD CONDITION.
01/01/1990 by USPSQD (POOR)
RECOVERY NOTE BY US POWER SQUADRON 1990 (GGB) MARK RECOVERED IN POOR CONDITION.

Control Text

  • The horizontal coordinates were scaled from a topographic map and have an estimated accuracy of +/- 6 seconds.
  • The orthometric height was determined by differential leveling and adjusted by the National Geodetic Survey in June 1991.
  • The geoid height was determined by GEOID99.
  • The dynamic height is computed by dividing the NAVD 88 geopotential number by the normal gravity value computed on the Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45 degrees latitude (G = 980.6199 gals.).
  • The modeled gravity was interpolated from observed gravity values.

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