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Details for Benchmark: DC0904

N 32° 43.317 W 117° 10.317 (NAD 83)

Altitude: 20.27

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 7
Marker Type:
survey disk
Setting:
massive structures with deep foundations
Stability:
Most reliable and expected to hold position/elevation well.

Must Read!

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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:]
photoH7 - Closeup
photoH7 - Area view

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.

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

Never thought that so many BMs can be found on a single object. This one is quite tricky to read, but easy to find.

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

[Photos:]
photoDC0904

In town with a work friend exploring the area while geocaching. This building was covered in benchmarks. She even got into the fun of finding them too!
This one was a little hard to read...

[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:]
photoDC0904_H7

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 7

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

[Photos:]
photoDC0904 H 7 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:]
photoDC0904 ~ H7
photoH7 from a distance

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:]
photoH7

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

I found it on a nice Sunday morning.

[Photos:]
photoIMG_1192

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...

On the wall north of the west entrance

[Photos:]
photoDC0904 H7 1938
The sun was not in my favor on this shot

14th of 15 found on this building.

[Photos:]
photoBM DC0904

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 7

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

[Photos:]
photoH7

Found as described in good condition.

[Photos:]
photoMark
N 32° 43.324 W 117° 10.332

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:]
photoDC0904, San Diego, CA

Found it.

[Photos:]
photoH 7

Found on an easy walk around the building

Attended 1000.

Located mark in good condition.

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 WALL, ABOUT MIDWAY BETWEEN THE FIRST AND SECOND WINDOWS NORTH OF THE WEST ENTRANCE, 31.1 FEET NORTH OF THE NORTH SIDE OF THE ENTRANCE, 1.1 FEET HIGHER THAN THE WINDOWS, AND ABOUT 3 1/2 FEET ABOVE THE GROUND.
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.
12/06/1997 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1997 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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