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Details for Benchmark: RD0693

N 45° 40.933 W 123° 17.333 (NAD 83)

Altitude: 594.87

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

Location:
In WASHINGTON county, OR View Original Datasheet
Designation:
C 354
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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Recovered in good condition. Under heavy tree cover, our Garmin nuvi 760 GPSr gave the coordinates as N 45° 40.949 W 123° 17.341 (with “26 foot accuracy”).

Differences from, and additions to, the 1962 description:
- There is no longer a post office in Glenwood.
- The mark is 18.7 feet roughly east (104°) from the centerline of the road (measured perpendicular from the alignment of the road at that point).
- There are 2 metal posts. One is a red post with a battered witness post sign - only a small portion of the actual sign is left. The other is a newer galvanized post that I suspect used to host a green Washington County Benchmark sign (now it has no sign – only the post). The mark is 1 foot north of the red post and 1.25 feet west of the galvanized post.
- The mark is approximately 37 feet east from where the center of the “graded road” connects to the opposite side of Timber road.
- The top of the disk is level with the surrounding ground.
- The mark is 39.5 feet SE (~130°) from Western Oregon Electric pole # 757862 (also labeled with “CS121”).
- The mark is 29.6 feet SSW (~204°) of a blue “RMA” sign.
-The mark is approximately 300 feet north down the road from the driveway for the house associated with the mail box mentioned in the 1962 report.

This is irrelevant to the benchmark, but Glenwood School (#110) used to be just a few yards east of here. There is nothing left of it now. It closed in the early 1930’s when enrollment dropped to 6 students. I know it was in use as early as 1919 – it was possibly active much earlier. (I found survey records that show a survey for a school in this area in November 1895). This school used to be a center for the community. On Sundays it served as the church and it was often used as a site for community picnics.

If you are interested, there is also a geocache only a few feet from the mark.

[Photos:]
photoRD0693 - Disk - near Glenwood, Oregon
photoRD0693 - Disk & Posts - looking south.
The two posts and the disk are in the lower left corner. The paved road is Timber road.
photoRD0693 – Eye Level looking east.
photoRD0693 - Looking roughly north.
The location of the mark is indicated by the yellow arrow. A portion of the “graded road” referenced in the 1962 description is on the left. Blue “RMA” signs can be seen on both sides of the road and utility pole # 757862 can be seen on the left.
photoRD0693 - Remnant of witness post sign.
(This close-up photo was taken on a previous visit in June 2008 but the sign still looks the same today.)

My gps shows coordinates should be N45 40.946 W 123 17.345

[Photos:]
photoRD0693

Documented History (by the NGS)

01/01/1942 by CGS (MONUMENTED)
01/01/1962 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1962 3.5 MI N FROM GLENWOOD. REACHED FROM THE POST OFFICE AT GLENWOOD GO WEST ON STATE HIGHWAY 8 FOR 0.4 MILE TO THE JUNCTION WITH THE HIGHWAY TO TIMBER, TURN RIGHT, GO NORTH FOR 3.1 MILES, LOCATED ON THE INSIDE OF A CURVE, 20 FEET EAST OF THE CENTER LINE OF THE HIGHWAY, 35 FEET NORTHEAST OF THE CENTER LINE OF THE HIGHWAY AND A GRADED ROAD GOING TO THE WEST, ABOUT 140 YARDS NORTH OF G. SCHMIDLIN MAIL BOX, AND 1 FOOT NORTH OF A METAL WITNESS POST. A STANDARD DISK SET IN TOP OF A CONCRETE POST THAT IS PROJECTING ABOUT 0.5 FOOT ABOVE GROUND AND ABOUT THE SAME ELEVATION AS THE CENTER LINE OF THE HIGHWAY. THIS IS 3.5 MILES SOUTH OF THE POST OFFICE AT TIMBER.
01/01/1989 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1989 (WCC) RECOVERED IN GOOD CONDITION.

Control Text

  • The horizontal coordinates were scaled from a topographic map and have an estimated accuracy of +/- 6 seconds.
  • The orthometric height was determined by differential leveling and adjusted by the National Geodetic Survey in June 1991.
  • The geoid height was determined by GEOID99.
  • The dynamic height is computed by dividing the NAVD 88 geopotential number by the normal gravity value computed on the Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45 degrees latitude (G = 980.6199 gals.).
  • The modeled gravity was interpolated from observed gravity values.

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