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Details for Benchmark: DC0900

N 32° 43.350 W 117° 10.317 (NAD 83)

Altitude: 20.26

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 9
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:]
photoH9 - Closeup
photoH9 - 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 good condition but can hardly be read under a pipe.

Tipapignola and I circled the entire building and could spot most of the benchmarks, including this one (despite the pipe covering it partially).

A bit hidden under a pipe, but since the whole building is covered in BM you'll hardly miss that one.

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:]
photoDC0900

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!
Found so many and took so many pics it was hard to log them... I'm sure I missed a few.

[Photos:]
photo
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:]
photoDC0900_H9

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 9

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

[Photos:]
photoDC0900 H 9

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:]
photoDC0900 ~ H9

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...

Located as described

3rd of 15 found on this building.

[Photos:]
photoBM DC0900

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 9

Found during lunch. Uploading photos.
mmcgr

[Photos:]
photoCloseup
photoArea Overview 01
photoArea Overview 02

Found as described in good condition.

[Photos:]
photoMark

Yup, right where it should be.

N 32° 43.357 W 117° 10.316

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:]
photoDC0900, San Diego, CA

Found it.

[Photos:]
photoH 9

Found this one on a quick walk around the building.

Attended 1000.

Located in good condition.

The coordinates were a little off on this one, but I believe it's because all of the ones around this building share a few common sets of coordinates. The coordinates are useful for finding the building, after that, you will need to read the description carefully to make sure that you are recording the correct bench mark.

[Photos:]
photobench mark disk
photoDC0899 & DC0900, with surrounding

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 NORTHEAST CORNER OF THE NORTH CONCRETE WALL OF THE NORTHEAST WING OF THE BUILDING, 33.3 FEET EAST OF THE EAST EDGE OF THE NORTH ENTRANCE, 1.1 FEET WEST OF THE NORTHEAST CORNER OF THE WING, AND ABOUT 4 1/2 FEET ABOVE THE GROUND.
01/01/1970 by CA3260 (GOOD)
RECOVERY NOTE BY CITY OF SAN DIEGO CALIFORNIA 1970 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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