Rod type benchmarks...

[glorkar]

Most of the rod type benchmarks in my area have been listed as not found, with no description. I'd like to try my luck in finding some, but I have no idea what I'm actually looking for. Most, if not all, appear to be the 'un-lided' kind. Are these just a metal rod in the ground? Do they have some sort of cement base? Pictures would be nice if anybody has some

 

An excerpt from PN0692

MARKER: I = METAL ROD

SETTING: 46 = COPPER-CLAD STEEL ROD W/O SLEEVE (10 FT.+)

SP_SET: COPPER-CLAD STEEL ROD

PROJECTION: RECESSED 3 CENTIMETERS

Edited July 15, 2010 by glorkar

[+billwallace]

From the 1974 station description:

 PN0692'BANK OF NEENAH, IN LINE WITH SOUTHEAST FACE OF BUILDING, 3/4 FT. BELOW
PN0692'GROUND SURFACE, A BRASS PLUG WELDED TO A 5/8 INCH DIAMETER COPPER
PN0692'COATED STEEL ROD, 10 FT. LONG, ENCASED IN A 6 INCH DIAMETER CONCRETE
PN0692'PIPE WITH COVER.

Looks like it has a cover to me... like this one- FV1959

[glorkar]

Okay, bad example, I just picked a random one (guess I picked wrong!) Here's a better example: PN0696

 

The description says nothing about a lid. The curb has been rebuilt and there are no markings pointing to the benchmark any more.

[Bill93]

I think that one would just be a metal rod in the ground. The Geological Survey used a lot of those when filling in map control in the 1960's around here. I have found them when they have good coordinates (your example is only SCALED) using a treasure hunter type of metal detector, but it is tough to do because the end of a rod doesn't present much area to the detector. You would have to do the best job of measuring you could in order to narrow down the search region, and also to have some confidence you weren't just finding a property corner pin or right-of-way marker that happened to be near.

 

It's a slam dunk with a magnetic locator like land surveyors and construction people use. Those will find the distortion the rod creates in the earth's magnetic field from several feet away. I've found a few rebars and copper coated rods by that method, like MH0500.

Edited July 15, 2010 by Bill93

[kayakbird]

glorkar,

 

The call from the center line of Hazel St should still be good. Are the light post and tree still there? If EAST IRVING AVENUE has been widened you may be out of luck. MEL

 

PN0696'OF EAST IRVING AVENUE, 102 FT. EAST OF THE CENTERLINE OF HAZEL ST.,

PN0696'52.1 FT. WESTERLY OF A LIGHT POST, 13.8 FT. EAST OF THE SECOND LARGE

PN0696'ASH EAST OF HAZEL STREET, 1.2 FT. SOUTH OF THE INNER EDGE OF CURB, ON

PN0696'SOUTH SIDE OF EAST IRVING AVENUE, 1/2 FT. BELOW THE GROUND, A 5/8 INCH

[glorkar]

It appears that the description should still be adequate for finding the mark. It is now a public park. I just recently got a metal detector and haven't been back yet. This wasn't really a question about a specific mark, more of a general question about the type of mark. Guess I'll just have to go find out for myself

[glorkar]

I think that one would just be a metal rod in the ground.

 

Thanks, that picture really helps. Kind of a needle in a haystack sort of thing, isn't it?

[+Harry Dolphin]

Data sheets do not necessarily mention covers. (Not sure that I've found one without the cover...)

PN0696_U.S. NATIONAL GRID SPATIAL ADDRESS: 16TCP780757(NAD 83)

PN0696_MARKER: I = METAL ROD

PN0696_SETTING: 46 = COPPER-CLAD STEEL ROD W/O SLEEVE (10 FT.+)

PN0696_SP_SET: COPPER-CLAD STEEL ROD

PN0696_PROJECTION: RECESSED 3 CENTIMETERS

PN0696_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL

PN0696_ROD/PIPE-DEPTH: 2.13 meters

 

Here's one with the same description:

 

LY2310_MARKER: I = METAL ROD

LY2310_SETTING: 49 = STAINLESS STEEL ROD W/O SLEEVE (10 FT.+)

LY2310_STAMPING: Z 449 1982

LY2310_PROJECTION: FLUSH

LY2310_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL

LY2310_ROD/PIPE-DEPTH: 4.9 meters

 

LY2310. Though my example does list the 'stamping' which is on the cover.

[Z15]

dupe

Edited July 20, 2010 by Z15

[Z15]

PN0696_U.S. NATIONAL GRID SPATIAL ADDRESS: 16TCP780757(NAD 83)

PN0696_MARKER: I = METAL ROD

PN0696_SETTING: 46 = COPPER-CLAD STEEL ROD W/O SLEEVE (10 FT.+)

PN0696_SP_SET: COPPER-CLAD STEEL ROD

PN0696_PROJECTION: RECESSED 3 CENTIMETERS

PN0696_STABILITY: B = PROBABLY HOLD POSITION/ELEVATION WELL

PN0696_ROD/PIPE-DEPTH: 2.13 meters

 

We have marks like this one in Michigan that I have found and used. They are encased in 6-inch metal pipe without any cover. Also there is a 1975 USLS/NOS Level line from Lake Michigan to Lake Superior that have copper coated rods encased in concrete pipe, some with a lid and some found w/o a lid. USLS liked to bury their marks below ground and often would not be noted in the description.

Edited July 20, 2010 by Z15