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Details for Benchmark: AI2011

N 44° 41.349 W 123° 13.134 (NAD 83)

Altitude: 311

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

Location:
In BENTON county, OR View Original Datasheet
Designation:
Y 683
Marker Type:
bench mark disk
Setting:
set into the top of a round concrete monument
Stability:
May hold, but of type commonly subject to surface motion.

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Spotted by geocaching near by. Some construction going on near by but they carefully protected the disk.

Found with wearn3. X marks the spot with this one. We had to gently lift up the white tape to get a photograph, and then put it back. The benchmark is in good condition.

[Photos:]
photoAI2011 - Y 683 - witness post/location
photoAI2011 - Y 683 - Benchmark

Found with BlueMoth

Spotted before checking out Camp Adair..

[Photos:]
photoY 683--up close
photoY 683-- a few feet away with Marker

Nice and easy!

Stopped in after a short hike the wildlife area. Since the last Geocaching "find" the mark has been covered over with a Tyvek X.

X marks the spot. Hard to miss this one.

[Photos:]
photoX marks the spot
photoThe Mark
photoMy Helper
photoLooking North
photoLooking East
photoLooking South

Good Easy one to find!

[Photos:]
photoBrass Cap

Nice and easy find... getting a couple of caches in the area.

N 44° 41.349 W 123° 13.137

Easy to find and a good test of GPS. Great view as the sun came up in the morning.

N 44° 41.348 W 123° 13.135

Found benchmark in grassy area between Adair Frontage Rd and 99W. Benchmark is clearly marked with USBM paddle sign 2 ft north.

[last edit: 8/27/2002 4:03:17 PM PST]

[Photos:]
photobenchmark
photosign
USBM paddle sign
photolooking east
The E.E. Wilson Wildlife Refuge is east of the benchmark.
photonorth
A recycling truck heads north on 99W towards the recyling center at Coffin Butte landfill. The butte can be seen in the distance.

Documented History (by the NGS)

01/01/1982 by ORDT (MONUMENTED)
DESCRIBED BY OREGON DEPARTMENT OF TRANSPORTATION 1982 (GVD) THE STATION IS LOCATED ABOUT 17.4 KM (10.80 MI) SOUTH OF MONMOUTH, 14.5 KM (9.00 MI) NORTH OF CORVALLIS, 2.0 KM (1.25 MI) NORTH OF ADAIR VILLAGE, ON THE EAST RIGHT-OF-WAY OF STATE HIGHWAY 99W. OWNERSHIP--OREGON STATE DEPARTMENT OF TRANSPORTATION. TO REACH THE STATION FROM THE JUNCTION OF U.S. HIGHWAY 20 EAST AND STATE HIGHWAYS 34 EAST AND 99W IN EAST CORVALLIS, GO NORTH ON HIGHWAY 99W FOR 7.24 KM (4.50 MI) TO THE INTERSECTION OF LEWISBURG ROAD. CONTINUE NORTH ON HIGHWAY 99W FOR 5.23 KM (3.25 MI) TO ARNOLD AVENUE ON THE RIGHT. CONTINUE NORTH ON HIGHWAY 99W FOR 2.01 KM (1.25 MI) PAST THE SOUTHERN ENTRANCE TO ADAIR FRONTAGE ROAD TO THE NORTHERN ENTRANCE TO ADAIR FRONTAGE ROAD. TURN RIGHT, EASTERLY, ON ADAIR FRONTAGE ROAD FOR 45 M (147.6 FT) TO THE STATION ON THE RIGHT. THE STATION IS AN OREGON STATE HIGHWAY DIVISION BENCH MARK DISK SET IN TOP OF 38 CM SQUARE CONCRETE MONUMENT FLUSH WITH THE GROUND. IT IS 22.9 M (75.1 FT) EAST FROM THE EAST EDGE OF THE HIGHWAY, 15.2 M (49.9 FT) SOUTH FROM THE CENTER OF ADAIR FRONTAGE ROAD, 11.6 M (38.1 FT) WEST FROM THE CENTER OF ADAIR FRONTAGE ROAD, AND 0.8 M (2.6 FT) SOUTH FROM A USBM PADDLE SIGN.

Control Text

  • The horizontal coordinates were established by GPS observations and adjusted by the National Geodetic Survey in April 2000. This is a SPECIAL STATUS position. See SPECIAL STATUS under the DATUM ITEM on the data sheet items page. 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 determined by GPS observations and a high-resolution geoid model.
  • The X, Y, and Z were computed from the position and the ellipsoidal ht.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The ellipsoidal height was determined by GPS observations and is referenced to NAD 83.
  • The geoid height was determined by GEOID99.

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