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Details for Benchmark: RD3604

N 45° 35.633 W 122° 48.714 (NAD 83)

Altitude: 988

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

Location:
In MULTNOMAH county, OR View Original Datasheet
Designation:
TRANS
Marker Type:
NGS Benchmark
Setting:
setting not listed - see description
Stability:

Reference Points

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This was my first benchmark to find. No moss, it looks like it was put here yesterday. I can see how it would be easy to "stumble" upon one. Coordinates were right on.

Found with jewilk1 today while hiking and caching this area. Covered with moss but thanks to previous logs it only took a few mins of searching.

Found today while geocaching and hiking the BPA trail. Convenient parking at the gate. BM was about 40' east of the trail in a clearing, completely covered with moss. Coords were pretty good.

[Photos:]
photoTrans BM
after cleaning off the moss and wiping it down with a rag

Found while out hiking the BPA Road with bluemoth and wearn3 today. Always nice to get another Forest Park benchmark.

[Photos:]
photoTrans

Found with blueMoth today. RM1 is very hard to find. If standing on the road, find the tree with a bow in it and it's to the right of it about ten feet or so. So I believe that would make it SW of the bowed tree.

Found with wearn3. We easily found the Benchmark and Reference mark 2, but had to do a bit of hunting for Reference mark 1. All three marks were recovered in good condition.

[Photos:]
photoRD3604 - TRANS - Benchmark Location
photoRD3604 - TRANS - Concrete monument
photoRD3604 - TRANS - Benchmark
photoRD3604 - TRANS RM1 - concrete monument
photoRD3604 - TRANS RM 1
photoRD3604 - TRANS RM 2 - Location
photoRD3604 - TRANS RM 2

I searched for this one over the summer, but did not find it. Returned today and was able to find the BM safe and sound after a short search.

[Photos:]
photoRD3604

I arrived here by hiking what I thought was the BPA road along the power lines. After bushwhacking down and back up the large hill, falling hard once, I arrived at the benchmark site. Another 30 feet and I found the nice even and open BPA road I should have been on. Oh well, part of the adventure. From the correct BPA road RM1 and RM2 are right near the road. Find either of these and the benchmark is easily found in a relative clearing near trees marked with red (now somewhat pink) flagging tape.

[Photos:]
photoRD3604 TRANS Benchmark
Benchmark near a tree with red (now pink) flagging tape. This photo was taken after cleaning off the collected crud from the top of the monument.
photoRD3604 TRANS Benchmark site
TRANS benchmark site looking north. Tree with flagging tape nearby.
photoRD3604 TRANS RM1
TRANS Reference Mark 1, about 10 feet east of the BPA road hiding under ferns and brush on a raised monument. This photo taken after the top of the monument was cleaned.
photoRD3604 TRANS RM1 Location
TRANS RM1 hiding among the vegetation. If you look just right from the road you might be able to see it.
photoRD3604 TRANS RM2
TRANS Reference Mark 2, about 7 feet east of the BPA road. This photo taken after doing some major cleaning of the monument.
photoRD3604 TRANS RM2 Before
RM2 as I found it, completely overgrown with moss, mud and natural camo. If it hasn't been cleaned in a while this is how you might find it.
photoRD3604 TRANS From BPA Road
View from BPA road of TRANS site. Up and just beyond the ferns on the left you will find RM1 on a concrete post. Arrow on the disk points to red (pink) flagging tape on a tree. Benchmark is just beyond and to the right. RM2 is to left of photo.
photoRD3604 TRANS Looking for RM2
From benchmark looking towards RM2. RM2 is in the direction of the first tree with lots of moss. Behind it is the middle of three pine trees in a row. RM2 is just behind the middle tree in line with the mossy tree.
photoRD3604 TRANS from RM1
Looking from RM1 to the benchmark site. Benchmark is almost center in this photo with red rag on it. Flagging tape is barely visible on tree, benchmark is just beyond and on the right of this tree in somewhat of a clearing.
photoRD3604 TRANS RM2 Site
View of RM2 site from BPA road. RM2 is in the foreground just left of center in this photo. Row of three trees are to the right. RM2 is in line with the middle tree and the one behind it to the benchmark.

Found this with eyekwilt2. She would of tripped over it if I not told her it was there lol.

Out doing a bit of research in the forest. Thanks to CrunchyFrog's photo showing the trail, I realized I was standing almost on top of it. Luckily, I looked down before I tried to take a forward step.

Found this benchmark awhile back but finally had some time to log it. Nice diversion from hiking.

[Photos:]
photobenchmark
Benchmark

Stumbled on this one while wondering through the woods.

Out for a fine, rainy hike with CF83 and CW. Headed off trail following the arrow on the GPSr, decided to make a small detour around some brush, tripped, picked myself back up and noticed that I was now staring straight at the benchmark just ahead of me. "I meant to do that!"

I was out gathering data with F Troopers and cw on a very very rainy December day! Fortunately FT's sharp eyes found the target right off the bat. The benchmark is doing great!
4/14/11: Came back and tracked down the two reference marks, thanks to help from P&T! I've added the photos.

This entry was edited by CrunchyFrog83 on Sunday, 17 April 2011 at 07:50:14 UTC.

[Photos:]
photoStation mark and GPSr
photoStation mark and monument with trillium
photoReference mark #1
photoReference mark #2
photoView of reference mark #2 looking toward BPA road

Recovered the station and both reference marks in good condition. We found the station at the adjusted coordinates. Even though there was not much hope of finding anything left of a stump from 63 years ago we did at least search for that reference item. As expected, we did not find any remnants of the stump.
We found the Box Score locations of RM1 and RM2 to be accurate.

Some items in 1946 description are quite a ways off. Assuming there was only one stump used as a reference locater for the Station and reference marks, the 3 references to it (one for each item) all put it in a different place. Also, like Danman said, RM1 is northwest of the station. RM2 is north-northeast of the station.

Changes and additions to the 1946 description are as follows:

  • Dancing Penguin’s directions to the parking place are very helpful. Traveling northwest on Skyline, you turn off the road 500 feet west-northwest from where the power lines cross over Skyline. The gate says “BPA ROAD” on the crossbar.

  • We found the Station at 12.1 meters roughly south-southeast of the center of the BPA road (measured perpendicular from the road).

  • The stump is no longer useful as a reference object.

  • We found the station at 39.6 meters (slope distance) from the center of the westernmost of two power poles supporting a single crossbeam. (The 39.6 meters is measured from the center of that pole, not from the center of the two support poles). The westernmost pole is labeled as “B” and the other pole supporting the crossbeam is labeled with five lines of numbers and letters: From top to bottom, the lines of numbers/letters on the easternmost pole are: “2”, “S J K”, “4”, “5”, “A”.

  • As mentioned in the 1946 description, the station is roughly aligned with two sets of poles in the area. We did not confirm the labeling on the other set of poles (that are east-southeast from the closest pair of poles).

  • The station disk is 3.5 inches in diameter and projects 7 inches above the ground. The concrete monument is 7.5 inches square at the very top. The concrete monument also has a small copper colored metal plate epoxied to the northwest lower side of the station monument. It is stamped with “E0O7NAA1R”. We are curious about this. If you know what it is, please let us know.

  • Reference Mark 1 (RM1) was found per the Box Score (NOT per 1946 the description text). It projects 12 inches above the ground. The concrete monument is 7.5 inches square at the very top. We found RM1 at 5.8 meters south-southeast of the center of the BPA road (measured perpendicular from the road).

  • Reference Mark 2 (RM2) was found per the Box Score (NOT per the 1946 description text). It projects 2 inches above the ground. The concrete monument is 7.5 inches x 6.5 inches at the very top. We found RM2 at 5.73 meters south-southeast of the center of the BPA road (measured perpendicular from the road). RM2 is approximately 1 meter east from a wooden stake.

It is 8.65 meters between RM1 and RM2. RM1 is on a bearing of roughly 250 degrees from RM2.

[Photos:]
photoRD3604 - Disk - Portland, Oregon
photoRD3604 - Looking SW at station.
photoRD3604 - Looking from Station to poles.
Foreground is the station mark. The yellow arrows point out the two closest power line poles (that support one crossbeam).
photoCE2771 TRANS RM1 disk
photoCE2771 TRANS RM 1 monument
photoCE 2772 TRANS RM2 disk
photoRD3604 - RM2, Station and RM1.
Looking roughly southwest. RM2 is in the foreground. A flag located above the Station is on the left and the flag on the right side of the photo is over RM1.
photoRD3604 - General area looking east-northeast.
Walk to the tree with the bow/curve at the base and then turn to the right and walk perpendicular from the road to get to TRANS.

Found this one hiding under a downed tree.

Took a bit of hunting, but Special K eventually stumbled upon Reference Marker #2. From there it was just a moment until we found the actual Benchmark, then spotted Reference Marker #1 on our way out for good measure.

Looked for this before, but missed it. One of the reference markers is right off the road...

These were FTF. The BPA road which provides access to the benchmarks isn't easy to identify from Skyline. There are two driveways you can take to get to it, and they're both west of the wooden power poles. Once you leave Skyline, you'll see a metal gate. Park near the gate and walk past it to find the benchmarks.

All three benchmarks are near each other on the right-hand (east) side of the road. Once you reach the location of the coordinates, just tromp around until you find them.

We found the Station Benchmark first; then Reference Mark 1 and thanks to Danman's notes we were able to quickly locate Reference Mark 2. I took photos of all three benchmarks. I marked RM2 with a stake tied with a pink plastic ribbon so others will be able to find it. Its incredible to think that those benchmarks were placed in 1946 before computers, satellites and GPS. Just waiting for us to come along and find them again.

[Photos:]
photoTRANS (station mark)
photoTRANS (station mark area)
photoTRANS (reference mark no. 1)
photoTRANS (reference mark no. 2)

Found it and the nearby reference marker RM1.

[Photos:]
photoTRANS
Cell phone cameras are terrible, eh?
photoTRANS reference #1

Found this one while working on a nearby geocache. I'm almost there now.

Found while looking for a cache in the area.

[Photos:]
photoTRANS

Easy find, found reference mark 1 but not 2 (but didn't look for that long).

My first one. Easy to find.

Easy find on a great day.

Easy find very close to the trail.

What Joyson said!

Quick find with a friend.

Yes sir

Found rather easily as Dan says.

This one was pretty easy to find! There are stakes with flagging on them pounded into the ground right next to it.
I just about tripped on RM1 on my way up to it. It took a while to find RM2. The description says that RM2 is East of the benchmark but I found it 28 feet almost due North (magnetic) of the Benchmark.
RM 1 is 20 feet NW of the benchmark.

[Photos:]
photoTRANS
photoReference Mark 1
photoReference Mark 2
photoView of the Area

Documented History (by the NGS)

01/01/1946 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1946 (RAE) STATION IS LOCATED ON A PROMINENT RIDGE 1.5 MILES SW OF LINNTON AND ABOUT 0.1 MILE N OF THE POINT WHERE THE BONNEVILLE POWER TRANSMISSION LINE CROSSES SKYLINE BOULEVARD. IT LIES 12.3 METERS SW OF THE CENTER LINE OF THE ROAD, 19.0 METERS W OF AN 18-INCH STUMP WITH A TRIANGLE OF NAILS IN THE TOP, AND 40.6 METERS (SLOPE DISTANCE) NW OF POWER-LINE POLE VE-2-11-6-B. THE STATION IS ON LINE WITH THIS POWER-LINE POLE AND POWER-LINE POLE VE-1-11-6-A. STATION MARK IS A BRONZE STATION DISK SET IN CONCRETE. IT IS STAMPED TRANS 1946 AND PROJECTS 6 INCHES ABOVE THE GROUND. REFERENCE MARK 1 IS NE OF THE STATION, 5.5 METERS SW OF THE CENTER LINE OF THE ROAD, AND 18.6 METERS NW OF AN 18-INCH STUMP WITH A TRIANGLE OF NAILS IN ITS TOP. IT IS A BRONZE REFERENCE DISK SET IN CONCRETE. IT IS STAMPED TRANS NO 1 1946 AND PROJECTS 6 INCHES ABOVE THE GROUND. REFERENCE MARK 2 IS E OF THE STATION, 5.5 METERS SW OF THE CENTER LINE OF THE ROAD, AND 10.0 METERS NW OF AN 18-INCH STUMP WITH A TRIANGLE OF NAILS IN ITS TOP. IT IS A BRONZE REFERENCE DISK SET IN CONCRETE. IT IS STAMPED TRANS NO 2 1946 AND PROJECTS 6 INCHES ABOVE THE GROUND. TO REACH THE STATION FROM THE INTERSECTION OF SKYLINE BOULEVARD AND GERMANTOWN ROAD IN NORTHWEST PORTLAND, PROCEED NW ALONG SKYLINE BOULEVARD FOR 0.9 MILE, TURN RIGHT ONTO PRIVATE ROAD AND BEARING TO THE RIGHT AT THE Y CONTINUE 0.2 MILE TO THE STATION ON THE RIGHT SIDE OF THE ROAD.

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in October 1991.
  • The orthometric height was scaled from a topographic map.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The geoid height was determined by GEOID99.

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