MnGCA

FlagFinder · Posted: Sun Jan 28, 2007 10:35 am Post subject: unlisted benchmarks

recently i have been stumbleing on benchmarks that are not even on the site. ive fouind about 10-15 of them many of them are ramsey county benchmarks which seem fairly new but i also found a 1960 one out in the middle of the woods near some posen caches near the resivoir i have pics of almost all of them but they are fairly bad

so what unlisted benchmarks have you found?

Arcticabn · Posted: Sun Jan 28, 2007 11:56 am Post subject:

Not all benchmarks are USGS. I believe that the gc.com tracking is for USGS benchmarks only. You can virtually go to every bridge over the interstate system and find a DOT benchmark. Many highrises structures have benchmarks located within a mile as survey points for the construction.

I don't think that it is practical to try and track every benchmark out there. But if thats your thing, go for it. Laughing

_________________
Airborne All the Way!

FlagFinder · Posted: Sun Jan 28, 2007 1:50 pm Post subject:

many that i find (listed) are from the highway dept. and the one i found in the woods i think was labeled hwy dept.

meralgia · Geocacher Joined: 22 Sep 2007 Posts: 467

Recently I found a vertical control disk with no numbers on it. What are the vertical control discs used for? And since there is no number, I'm guessing it can't be logged?

Pear Head · Posted: Thu Jul 17, 2008 12:33 pm Post subject:

I would guess it's an elevation marker.

What were the markings that were on it? Often times there are reference marks (RMs) that set up where the actual station disk is.
_________________
Hmm...

meralgia · Geocacher Joined: 22 Sep 2007 Posts: 467

vertical control mark
-
for information or to report damage with
commissioner
minnesota highway dept
st. paul, minn

Pear Head · Posted: Thu Jul 17, 2008 12:44 pm Post subject:

pfalstad · Geocacher Joined: 02 Feb 2006 Posts: 962 Location: Edina

Pear Head · Posted: Thu Jul 17, 2008 2:19 pm Post subject:

The gc.com database was last updated by a CD from NGS in something like November of 2003 or 2004.
_________________
Hmm...

pfalstad · Geocacher Joined: 02 Feb 2006 Posts: 962 Location: Edina

msrubble · Posted: Fri Jul 18, 2008 11:54 pm Post subject:

meralgia, it might just be new. Was there recent road or bridge construction in the area?

I found a standard MnDOT aluminum disk on a bridge in Hutchinson, with no designation/stamping. There was construction going on at the time. That one was not in the geocaching.com database.

Kalli01 · Geocacher Joined: 21 Apr 2007 Posts: 88

i found one yesterday.it had on it (4Rc1952)i tried even to put in the coords at it and could find nothing.its up by brimson.lots of times i can't get it to find the right place and i don't know how to check it differently.the page only gives you 3 options.does any one have any sugestions on how to find benchmarks?thanks for any help Kalli01

Pear Head · Posted: Wed Oct 29, 2008 1:31 pm Post subject:

EskoClimber · Posted: Sat Nov 01, 2008 7:58 pm Post subject:

It is up to the agencies, MnDOT, WiDOT, etc., involved to submit their benchmarks to the National Geodetic Survey.
I've found old marks from the 1920s and 1930s that haven't been in the national database. Darn it anyway.

You can go the National Geodetic Survey and look up benchmarks directly. You can search for them much the same way as on gc.com. Since their database is current as the information submitted to them, you'll have a better chance of finding those wayward marks. Of course that won't help you log the find on gc.com.