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Details for Benchmark: DX4667

N 33° 54.516 W 117° 47.447 (NAD 83)

Altitude: 1068.1

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

Location:
In ORANGE county, CA View Original Datasheet
Designation:
3 9 14 RESET
Marker Type:
NGS Benchmark
Setting:
setting not listed - see description
Stability:

Reference Points

Must Read!

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Found RM 4 right away. Followed the arrow to an undocumented witness post, and near the witness post, found the remains of what is probably the concrete pad for the station mark. Later, using the directions & distances from the "box score" of the datasheet, was able to find RM 5. Unable to find RM 3. It might be there, but the area is very brushy and difficult to search.

[Photos:]
photoDX4667 RM4 Area in Chino Hills SP, CA
photoDX4667 RM4 disc in Chino Hills SP, CA
photoDX4667 Witness Post in Chino Hills SP, CA
photoDX4667 Disc Missing in Chino Hills SP, CA
photoDX4667 RM5 Disc in Chino Hills SP, CA
photoDX4667 RM5 Area in Chino Hills SP, CA
photoHelicopter doing practice landings
He landed on several hilltops across the valley, including Gilman Peak. I've seen one doing the same thing a couple years ago. I'm guessing they are OC fire department choppers on training flights. Keep it up!

Documented History (by the NGS)

01/01/1973 by CA-059 (MONUMENTED)
DESCRIBED BY ORANGE COUNTY CALIFORNIA 1973 (JLC) THE STATION IS LOCATED IN SE 1/4 SEC 14, T 3 S, R 9 W, ABOUT 2 MILES NORTHEAST OF YORBA LINDA AND 4 MILES NORTH OF STATE HIGHWAY 91 (RIVERSIDE FREEWAY). IT IS ON PROPERTY OWNED BY THE SHELL OIL COMPANY, 4024 VALLEY VIEW AVENUE, YORBA LINDA. PHONE 714 528 7076. TO REACH THE STATION FROM THE INTERSECTION OF STATE HIGHWAY 90 (IMPERIAL HIGHWAY) AND YORBA LINDA BLVD IN YORBA LINDA, GO EAST ON YORBA LINDA BLVD FOR 0.1 MILE TO A CROSSROAD. TURN LEFT AND GO NORTH ON LAKE VIEW AVENUE FOR 0.8 MILE TO A CROSSROAD (BASTANCHURY ROAD) AND A LOCKED GATE AHEAD. PASS THROUGH THE GATE AND TURN RIGHT AND GO EAST ON A TRACK ROAD FOR 0.05 MILE TO A FORK. TAKE THE LEFT FORK AND GO NORTHEAST ON THE MAIN TRACK ROAD FOR 0.65 MILE TO A T-INTERSECTION. TURN RIGHT AND GO EAST ON THE TRACK ROAD FOR 0.3 MILE TO A T-INTERSECTION. TURN LEFT AND PASS THROUGH THE GATE AND GO NORTH AND EAST UP THE HILL ON THE TRACK ROAD FOR 0.55 MILE TO A CROSSROAD. CONTINUE STRAIGHT AHEAD ON THE TRACK ROAD AND GO SOUTHEAST FOR 0.45 MILE TO A DIM SIDEROAD ON THE RIGHT. TURN SHARP RIGHT AND GO SOUTHWEST FOR 0.1 MILE TO THE TOP OF THE HILL AND THE STATION ON THE LEFT. THE STATION MARK IS AN ORANGE COUNTY SURVEY DISK STAMPED 3-9-14 RESET 1973, CEMENTED IN THE TOP OF A 14-INCH SQUARE CONCRETE MONUMENT WHICH IS FLUSH WITH THE SURFACE OF THE GROUND. IT IS 51 FEET SOUTH-SOUTHWEST OF A POWER POLE, 18 FEET SOUTHEAST OF THE CENTER OF THE TRACK ROAD, AND 16 FEET SOUTHEAST OF A POINT WHERE THE POWER LINE PASSES OVERHEAD. REFERENCE MARK 3 IS AN ORANGE COUNTY SURVEY DISK STAMPED 3-9-14 RM 3 RESET 1973, CEMENTED IN THE TOP OF A 6-INCH ROUND CONCRETE MONUMENT WHICH PROJECTS 2 INCHES ABOVE THE SURFACE OF THE GROUND. IT IS 45 FEET SOUTHEAST OF THE CENTER OF THE TRACK ROAD. REFERENCE MARK 4 IS AN ORANGE COUNTY SURVEY DISK STAMPED RM 4 3-9-14 RESET 1973, CEMENTED IN THE TOP OF A 6-INCH SQUARE CONCRETE MONUMENT WHICH PROJECTS 2 INCHES ABOVE THE SURFACE OF THE GROUND. IT IS 33 FEET NORTHEAST OF A POWER POLE AND 22 FEET SOUTHEAST OF THE CENTER OF THE TRACK ROAD. REFERENCE MARK 5 IS AN ORANGE COUNTY SURVEY DISK STAMPED RM 5 3-9-14 RESET 1973, CEMENTED IN THE TOP OF A 6-INCH SQUARE CONCRETE MONUMENT WHICH PROJECTS 2 INCHES ABOVE THE SURFACE OF THE GROUND. IT IS 11.5 FEET SOUTH-SOUTHWEST OF A POWER POLE, 10.5 FEET SOUTHEAST OF THE CENTER OF THE TRACK ROAD, AND 2 FEET SOUTHEAST OF A POINT WHERE THE POWER LINE PASSES OVERHEAD. HEIGHT OF LIGHT ABOVE STATION MARK 4.05 METERS.
01/01/1977 by CADT (GOOD)
RECOVERY NOTE BY CALTRANS 1977 (ARA) THE STATION MARK AND REFERENCE MARKS NO 3, NO 4 AND NO 5 WERE RECOVERED IN GOOD CONDITION AS DESCRIBED.

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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