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Details for Benchmark: DC1668

N 32° 42.059 W 117° 14.548 (NAD 83)

Altitude: 203

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

Location:
In SAN DIEGO county, CA View Original Datasheet
Designation:
SAN DIEGO LATITUDE STA
Marker Type:
NGS Benchmark
Setting:
setting not listed - see description
Stability:

Reference Points

Must Read!

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Found the Benchmark today. I do have access to the base, fortunately. Headed to the East Coast this evening and consider myself lucky to have seen it.

[Photos:]
photoimage

Damn! as Bearbrew says, you need clearance to get to this Station. This being CA's oldest Mark, is the main reason I came out to Point Loma. I shouldn't complain, I got to see all kinds of interesting things while out here. I'll just have to see about getting a clearance to get on the base and come back to recover this most challenging BM!

Found this Triangulation Station as described just north of the red and white painted tower located in the middle of the magazine area of the Naval Fuel and Supply Depot. Unfortunately, I did not look for the Reference Marks. Security clearance is required to reach this site making it difficult to access the area. The description coordinates are right on.

[Photos:]
photoDC1668 - Astro 1851 Reset 1942
Looking S SE toward the communication tower
photoDC1668 - SAN DIEGO LATITUDE STN - NGS BENCHMARK -
The disk in the granite block.
N 32° 42.061 W 117° 14.552

The Station and Reference Mark 2 were recovered in good condition as described. Reference Mark 1 is gone. Confirmed by the folks at the Naval Fuel and Storage Depot. RM1 was removed when the new tower was constructed. (FTF California's OLDEST BM!) TFTB!!

-ea6bflyr

Added Lat/Long

[This entry was edited by ea6bflyr on Friday, May 23, 2008 at 5:08:48 PM.]

[Photos:]
photoASTRO 1851
photoClose up ASTRO 1851
photoASTRO 2 (RM2)
photoASTRO 1851 Granite & Concrete
photoASTRO 1851 - 1872 Granite Markings
photoASTRO 1851 - CS Granite Marking
photoWhere RM1 used to be

Documented History (by the NGS)

1/1/1851 by CGS (MONUMENTED)
1/1/1871 by CGS (GOOD)
DESCRIBED BY COAST AND GEODETIC SURVEY 1871 RECOVERED.
1/1/1887 by CGS (GOOD)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1887 (AFR) RECOVERED.
1/1/1899 by CGS (SEE DESCRIPTION)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1899 (FW) ABOUT 2 FEET BELOW AND ABOUT 40 FEET NORTHEAST OF THE HIGHEST PART OF THE FIRST ROUND-TOPPED HILL SOUTHWEST OF THE NORTH END OF LA PLAYA. THE STATION WAS MARKED 2 FEET BELOW THE SURFACE BY A PORTER BOTTLE, BOTTOM UP, AND BELOW THIS A SECOND BOTTLE. IN 1871 A LARGE PIECE OF SANDSTONE ROCK WAS SET WITH ITS TOP SURFACE 4 INCHES BELOW THE GENERAL SURFACE OF THE GROUND, A HALF-INCH HOLE 1-1/2 INCHES DEEP MARKING THE EXACT CENTER. TO THE NORTH, 8 FEET FROM THE CENTER, WAS BURIED A BOTTLE, AND A STUB, WITH A COPPER TACK IN THE TOP, AT THE SURFACE. SIX FEET TO THE EAST OF THE CENTER A BOTTLE WAS BURIED AND A STUB PLACED AT THE SURFACE, AND SIMILAR MARKS 8 FEET SOUTH OF THE CENTER. THE MIDDLE OF THE EAST SIDE OF A WOODEN BLOCK, A FOOT AND A HALF SQUARE AND 2-3/4 FEET ABOVE GROUND, WAS DISTANT 17 FEET 7-1/2 INCHES FROM THE CENTER OF THE STATION. THE THREE THEODOLITE STUBS, EACH WITH A FENCING STAPLE IN THE TOP, WERE LEFT STANDING.
1/1/1942 by CGS (SEE DESCRIPTION)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1942 (LLM) AT SOME UNKNOWN DATE THE SANDSTONE ROCK MARKING THE CENTER WAS REPLACED BY A GRANITE MONUMENT. IN 1942 THE GRANITE MONUMENT WAS FOUND TIPPED OVER BY TOP SOIL EXCAVATORS. THE UNDERGROUND MARK (A BOTTLE) WAS RECOVERED AND THE MONUMENT WAS CAREFULLY RESET. AT A LATER DATE WHEN THE ORIGINAL DESCRIPTION BECAME AVAILABLE, A QUART PORTER BOTTLE WAS FOUND EXACTLY 6 FEET TO THE EAST AND A SIMILAR BOTTLE 8 FEET TO THE NORTH. THE BOTTLE TO THE SOUTH WAS NOT FOUND. A LIMESTONE ROCK WITH A DRILL HOLE WAS FOUND AT THE SITE AND WAS EVIDENTLY REMOVED WHEN THE EXISTING GRANITE MONUMENT WAS PLACED IN ITS STEAD. THE MONUMENT IS ABOUT 10 IN X 12 IN WITH THE UPPER 10 IN DRESSED. THE WEST FACE BEARS THE LETTERS C.S.--THE EAST FACE, B.M. AND THE NORTH FACE BEARS THE DATE 1872. ORIGINALLY A DRILL HOLE MARKED THE CENTER. IN 1942 A STANDARD DISK STAMPED ASTRO 1851 RESET 1942 WAS SET IN THE DRILL HOLE. THIS STATION APPEARS ON A MAP OF THE U.S. ENGINEERS DATED 1901 AS ASTRO AND THE NAME HAS BEEN USED BY LOCAL ENGINEERS FOR MANY YEARS. IT IS LOCATED AT ABOUT THE CENTER OF THE PRESENT NAVAL FUEL DEPOT AT AN ELEVATION OF ABOUT 201 FEET AND COMMANDS A VIEW OF A LARGE PART OF SAN DIEGO BAY. REFERENCE MARK NO. 1 IS A STANDARD DISK STAMPED ASTRO 1, 35.00 FEET DISTANT AND IN LINE WITH POINT LOMA LIGHTHOUSE (OLD). SET IN A CONCRETE MONUMENT WITH A PEPSI COLA BOTTLE FOR AN UNDERGROUND MARK. REFERENCE MARK NO. 2, 35.00 FT. DISTANT, IS A STANDARD DISK STAMPED ASTRO 2, SET IN A CONCRETE MONUMENT IN LINE WITH THE TOWER ON THE ADMINISTRATION BUILDING AT THE NAVAL AIR STATION. A PINT RECTANGULAR BOTTLE WAS SET BENEATH THE MONUMENT.
1/1/1955 by CGS (GOOD)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1955 (EEJ) THE STATION AND REFERENCE MARKS 1 AND 2 WERE RECOVERED AS DESCRIBED AND IN GOOD CONDITION.
1/1/1962 by CGS (GOOD)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1962 (FN) THE STATION AND REFERENCE MARK 1 AND 2 WERE RECOVERED IN GOOD CONDITION. THE STATION IS LOCATED ON POINT LOMA, IN THE MAGAZINE AREA OF THE NAVAL FUEL AND SUPPLY DEPOT, ABOUT 2 MILES NORTH OF THE OLD POINT LOMA LIGHTHOUSE AND ABOUT 1.2 MILES NORTH-NORTHEAST OF BALLAST POINT. TO REACH THE STATION FROM THE INTERSECTION OF ROSECRANS AND WARHEAD ROAD, GO WEST ON WARHEAD ROAD FOR 0.4 MILE, TURN LEFT ON MEYER ROAD AND GO 0.2 MILE TO TOP OF HILL AND STATION ABOUT 50 FEET ON THE LEFT. THE STATION IS A STANDARD DISK, STAMPED ASTRO 1851 RESET 1942, SET IN THE TOP OF A 10-INCH BY 12-INCH GRANITE MONUMENT THAT PROJECTS 2 INCHES ABOVE A 4 FOOT SQUARE CONCRETE SLAB. IT IS 48 FEET NORTH OF THE NORTH CORNER OF A CONCRETE FOUNDATION OF A WOODEN LOOKOUT TOWER, AND 4.1 FEET EAST OF A WITNESS POST. REFERENCE MARK 1 IS A STANDARD DISK, STAMPED ASTRO 1, SET IN THE TOP OF A 12 INCH SQUARE CONCRETE MONUMENT THAT PROJECTS 6 INCHES ABOVE THE GROUND. REFERENCE MARK 2 IS A STANDARD DISK, STAMPED ASTRO 2, SET IN THE TOP OF A 12 INCH SQUARE CONCRETE MONUMENT THAT PROJECTS 8 INCHES ABOVE THE GROUND.
1/1/1963 by CGS (MARK NOT FOUND)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1963 (FN) THE STATION AND REFERENCE MARK ARE LOST. THE AREA IN WHICH THE STATION PLOTS IS NOW OCCUPIED BY A PAVED PARKING LOT.
1/1/1970 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1970 (RBM) THE STATION AND REFERENCE MARKS WERE RECOVERED IN GOOD CONDITION AS DESCRIBED IN 1962 EXCEPT A 4 FOOT SQUARE CONCRETE SLAB HAS BEEN POURED AROUND THE STATION MONUMENT AND THE 10 INCH BY 12 INCH MOUMENT PROJECTS ABOUT 3 INCHES ABOVE THE SURFACE OF THE SLAB. IN THE TO REACH DESCRIPTION, CHANGE MEYER ROAD TO MANNEY ROAD. AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN--SAN DIEGO (PT. LOMA)
1/1/1972 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1972 (RBM) THE STATION AND REFERENCE MARKS WERE RECOVERED IN GOOD CONDITION AS DESCRIBED BY F.N. IN 1962. THE STATION MARK IS STAMPED ASTRO 1851 RESET 1942. PERMISSION TO VISIT THE STATION SITE MUST BE OBTAINED THE NAVAL FUEL AND STORAGE DEPOT, BLDG. 50. AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN--AT SAN DIEGO

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in June 1996. The horizontal coordinates are valid at the epoch date displayed above. The epoch date for horizontal control is a decimal equivalence of Year/Month/Day.
  • The orthometric height was scaled from a topographic map.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The geoid height was determined by GEOID99.

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