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Details for Benchmark: TZ1994

N 32° 59.565 W 118° 32.996 (NAD 83)

Altitude: 522.2

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

Location:
In LOS ANGELES county, CA View Original Datasheet
Designation:
BRIDE
Marker Type:
triangulation station disk
Setting:
in a boulder
Stability:

Reference Points

Must Read!

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Biked to this one from the San Clemente Natural Resources Office (NRO). Parked the bike, walked down the hill a bit, following the arrow. What should I see but an old wooden survey tower lying on it's side! Another first for the Klemmer! Found the station mark and RM 2 (also DY2058). RM 1 (also DY2057) not found after thorough search. See also DY2056 (Bride, the vertical control station i.e. Bench Mark).

[Photos:]
photoApproach to TZ1994 and voila - the tower!
photoCloser view of TZ1994 tower
photoTZ1994 Disc on San Clemente Island CA
photoView to the northeast over TZ1994
photoTZ1994 RM2 on San Clemente Island CA
photoTZ1994 RM2 area on San Clemente Island CA
I've seen a lot of Lichen over years of outdoors & wilderness sports, but the stuff an San Clemente Island is on steroids! According to my local expert botanist, the reasons are: 1) the climate is just right (cool, moist, foggy), and 2) the almost complete lack of air pollution and 3) no acid rain at all, ever. Some I saw was up to about 6 inches long in spots.
photoSoutherly view over TZ1994 RM2
This is the eastern side of San Clemente Island, which is the more rugged, steeper side.

Documented History (by the NGS)

01/01/1933 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1933 (RWK) ON SAN CLEMENTE ISLAND, ABOUT 500 METERS SOUTHEAST OF WILSONS COVE, NEAR THE EDGE OF THE FIRST BENCH ABOVE THE TRAIL LEADING SOUTHEAST FROM WILSONS COVE. SURFACE AND REFERENCE MARKS ARE STANDARD BRONZE DISKS.
01/01/1936 by CGS (GOOD)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1936 (HBC) THE STATION WAS RECOVERED AS DESCRIBED EXCEPT THAT THE DISTANCE FROM WILSONS COVE IS ABOUT 1500 METERS. STATION AND REFERENCE MARKS WERE FOUND IN EXCELLENT CONDITION. THE DISTANCES TO REFERENCE MARKS WERE RE-MEASURED. DISTANCE TO REFERENCE MARK NO. 1 IS 11.265 METERS AND TO REFERENCE MARK NO. 2 IS 12.710 METERS.
01/01/1940 by CGS (GOOD)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1940 (RDH) STATION RECOVERED 3/14/40 WITH THE STATION MARK AND BOTH REFERENCE MARKS IN GOOD CONDITION AND SOLID IN THE ROCK EXCEPT THAT REFERENCE MARK NO. 2 NEEDS A NEW CEMENT PATTY. THE STATION IS ON THE BROW OF THE EASTERN SHOULDER OF THE MAIN RIDGE ABOUT 1500 METERS SOUTHEAST OF WILSONS COVE AND ABOUT 300 FEET ABOVE THE TRAIL LEADING ALONG THE COAST FROM THE COVE. THE POINT WHERE THE STATION IS LOCATED IS STEEP AND COVERED WITH BOULDERS AND CACTUS AND THE TRAIL BELOW IS VISIBLE FROM THE STATION. THE RED, CONICAL TOPS OF THE TWO WATER TANKS NEAR STATION BLAIR ARE JUST VISIBLE FROM THE STATION AND SHOW 4 DEGREES EASTWARD OF THE NORTH TANGENT OF WILSONS COVE, AND 332 DEGREES MAGNETIC FROM THE STATION. THERE IS A GREEN-PAINTED, RED-ROOFED STABLE NEAR THE TRAIL, ABOUT 1/2 MILE, 352 DEGREES MAGNETIC, FROM THE STATION.
01/01/1947 by CGS (SEE DESCRIPTION)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1947 (RDH) STATION RECOVERED IN GOOD CONDITION. DESCRIBED AS FOLLOWS-- LOCATED ON SAN CLEMENTE ISLAND ABOUT 1500 METERS SOUTHEAST OF WILSON COVE AND 300 METERS WEST OF THE NORTHEAST SHORELINE OF THE ISLAND ON THE EAST SHOULDER OF THE MAIN RIDGE LEADING SOUTH FROM THE EASTERN LIMITS OF WILSON COVE, AT ABOUT 500 FEET ELEVATION. THE POINT WHERE THE STATION IS LOCATED IS STEEP AND COVERED WITH BOULDERS AND CACTUS. IT IS ABOUT 300 FEET ABOVE THE TRAIL LEADING DOWN THE NORTHEAST SHORE OF THE ISLAND FROM WILSON COVE. REACHED FROM WILSON COVE AS FOLLOWS--GO SOUTHEAST ALONG THE TRAIL DOWN THE NORTHEAST SHORE OF THE ISLAND ABOUT 1 MILE THENCE UP A STEEP SLOPE ABOUT 300 FEET ABOVE THE TRAIL AND THE STATION. THE STATION IS VISIBLE FROM THE TRAIL. STATION MARK IS A STANDARD DISK SET IN A DRILL HOLE IN BOULDER STAMPED BRIDE 1933. REFERENCE MARKS ARE STANDARD DISKS SET IN DRILL HOLES IN BOULDERS STAMPED NO. 1 1933 AND NO. 2 1933 RESPECTIVELY.
01/01/1952 by CGS (GOOD)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1952 (JCE) ALL MARKS WERE RECOVERED AS DESCRIBED IN THE 1947 DATA AND IN GOOD CONDITION. DISTANCES TO REFERENCE MARKS WERE CHECKED.
01/01/1984 by DMA (SEE DESCRIPTION)
RECOVERY NOTE BY DEFENSE MAP AGENCY 1984 (MH) BRIDE NO 1, BRIDE NO 2 THE STATION MARK AND A CHUNK OF BOULDER IS REMOVED FROM ORIGINAL POSITION. REFERENCE MARKS FOUND IN GOOD CONDITION BY U.S.C AND G.S. DESCRIPTION.

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 NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) The vertical order pertains to the superseded datum.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The geoid height was determined by GEOID99.

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