I found this bench mark while on a docent led Mountain Bike Ride in the Weir Canyon Wilderness Area. Access to this area is only on docent led hike, runs, walks and mountain bike rides on this property.
This property is managed by the Irvine Ranch Conservancy.
Here is the link to the area where you may find the link to sign up for docent led events.
(
visit link)
Included below is the full text of the Orange County Surveyors data sheet. The go to description will not be accurate to anyone taking a IRC led event.
County of Orange, P.F.R.D. / Geomatics - Land Information Systems
Vertical Control Data Sheet - O.C.S. 1995 Adjustment
Designation: 3KK-7-71 Date Destroyed:
Date Revised:
Line #/SSN: 383/0110 GPS #:
For Reconnaisance Only! Latitude (30' +/-) 33 49 21.7
Longitude (30' +/-) 117 44 39.6
Monument Type: Orange County Surveyor's 3 3/4" Aluminum Disk
Established By: OCS 1971
NAVD88 NGVD29 YEAR LEVELED
FEET METERS FEET METERS
744.988 227.072 742.569 226.335 1991
"To Reach" Description: DESCRIBED BY OCS 1991 FROM THE INTERSECTION OF CHAPMAN AVENUE AND JAMBOREE ROAD, PROCEED NORTHERLY ON JAMBOREE 0.3 MILE TO OLD CHAPMAN ROAD, PROCEED WESTERLY ON OLD CHAPMAN ROAD 165 FT. TO GATE ON NORTHERLY SIDE OF OLD CHAPMAN ROAD, GO THRU GATE AND PROCEED ON DIRT ROAD 0.5 MILE CROSS CREEK AND IMMEDIATELY TAKE LEFT. FORK, 0.7 MILE NORTHWEST PARALLELING CREEK DOWNSTREAM TO A LOCKED GATE, PROCEED THRU THE GATE 1.4 MILES NORTHEAST IN WEIR CANYON, TO A "Y" IN THE ROAD, AND AN OLD ROCK AND CONCRETE HEADWALL, WHICH IS ABOUT 35 FT. SOUTH OF A CREEK CROSSING, SET AT THE TOP OF A CONCRETE POST, 30 FT. EAST OF THE ROAD TO THE NORTH, 20 FT. NORTHWEST OF THE ROAD TO THE NORTHEAST, 7 FT. SOUTH OF A 1.5 FT. DIAMETER OAK TREE AND ABOUT 0.5 OF A FT. ABOVE THE GROUND.
O.C.S. Control Index Map: Q07-08
Map Page: 771/B-6
City / Location: Unin., Orange Co.
Benchmarks may have more than one height due to the datum, adjustments, and year leveled. To avoid confusion, always state these as references when using benchmark elevation values.