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Details for Benchmark: DC0903

N 32° 43.317 W 117° 10.317 (NAD 83)

Altitude: 22.29

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

Location:
In SAN DIEGO county, CA View Original Datasheet
Designation:
H 16
Marker Type:
survey disk
Setting:
massive structures with deep foundations
Stability:
Most reliable and expected to hold position/elevation well.

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I was geocaching in the area and thought there may be a benchmark on this building. I enjoy locating benchmarks and have never seen a building with this many. I located all 15 benchmarks on this building. It's interesting that there is not an H4, but I don't see any history of one. All were in good condition, with some having paint covering part of the mark.

[Photos:]
photoH16 - Closeup
photoH16 - Area view

Tipapignola and I circled the entire building and could spot most of the benchmarks, including this one.

During our trip to the US I found out more about benchmarks. I tried to find as many as possible which turned out to be tricky.
This benchmark was in perfect condition.

Still some paint in the BM, but could easily identify it. Again another BM with identical coords.

Finally got back over here (with FlagMan) to find BMs missed when the building was under construction. Disk appears to be in fair-to-good condition, albeit partially painted over.

[Photos:]
photoDC0903

In town for a conference, and we had some free time tonight. So came to this area to find a bunch of benchmarks!

[Photos:]
photo

Finding benchmarks here is like shooting fish in a barrel. My guess is this building was the epicenter of a lot of mapping in the area.

[Photos:]
photoDC0903_H16

Just like Hoover Dam, this place is a benchmark wonderland!! No coords needed, all were easy to spot. I grabbed 15 marks in a ten minute walk around. Most in very good shape.

[Photos:]
photoH 16

Came back to log the Marks that I couldn't get before due to construction.

[Photos:]
photoDC0903 H 16 1938

In town from Denton, Texas, visiting family. Took the kids to the new park here and went a little crazy discovering and photographing all of the benchmarks surrounding the county building!

[Photos:]
photoDC0903 ~ H16

Came here today along with fisnjack and dillweed with the express purpose of finding the benchmarks on this building. Due to construction areas being closed off to the public, we were only able to discover 7 of them. This was one.

[Photos:]
photoH16

Found along with Dillweed and Ragfoot. Hard with all the construction going on.

Fisnjack, Ragfoot and I hooked up to find a few benchmarks this morning.

[Photos:]
photoIMG_1191

Decided to walk around town after jury duty, I had loooked up nearby BM's while waiting.
Good to get out and get some exercise on this beautiful day.

having fun walking around and looking... easy benchmark finds..!

N 32° 43.322 W 117° 10.330

Located as described

[Photos:]
photoDC0903 / H16-20.368' / 1938
It's there on the north side of the steps on the wall
photoDC0903 / H16-20.368' / 1938
This one was a little more accessible.

15th of 15 found on this building.

[Photos:]
photoBM DC0903

Found with my girls, we did a quick run around the building, we missed several... we'll just have to come back.

D!

[Photos:]
photoH 16

On my trip to San Diego I did the first steps in Benchmarking! Found this one easily!

[Photos:]
photoH16

Found as described in good condition.

[Photos:]
photoMark
N 32° 43.319 W 117° 10.331

Found this entire set while benchmarking with sdstickman. If H4 exists, it is underneath ramp east of stairway entrance to the south side of the building. Nice easy starter set for newbies. Alternative designation for set: COUNTYMOUNTIE01 thru COUNTYMOUNTIE16.

[Photos:]
photoDC0903, San Diego, CA

Found it on the left side of the Harbor Drive entrance of the County Administration building.

[Photos:]
photoHPIM1052.JPG

Found it.

[Photos:]
photoH 16

Found on a quick walk around the building

Attended 1000.

This benchmark was located, how it's inscription is unable to be read. Benchmark has been painted over. All benchmarks on the hall were logged and identity ascertained by description.

Documented History (by the NGS)

01/01/1938 by USGS (MONUMENTED)
01/01/1955 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1955 AT SAN DIEGO. AT SAN DIEGO, AT THE CIVIC CENTER, SET VERTICALLY IN THE WEST CONCRETE FACE OF THE NORTH ONE OF TWO TOWERS AT THE WEST ENTRANCE TO THE BUILDING, 19.5 FEET NORTH OF THE NORTH SIDE OF THE ENTRANCE, 1.6 FEET SOUTH OF THE NORTHWEST CORNER OF THE TOWER, AND ABOUT 1 FOOT HIGHER THAN THE NORTH BALUSTRADE.
01/01/1967 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1967 RECOVERED IN GOOD CONDITION.
01/01/1978 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978 RECOVERED IN GOOD CONDITION.
01/01/1987 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1987 RECOVERED IN GOOD CONDITION.
01/01/1988 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1988 (JBC) RECOVERED IN GOOD 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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