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Details for Benchmark: AB4130

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N 40° 00.118 W 097° 22.152 (NAD 83)

Altitude: 1578

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

Location:: In THAYER county, NE View Original Datasheet
Designation:: T1N R1W SEC 36 SE COR STONE KS NE RESET
Marker Type:: NGS Benchmark
Setting:: setting not listed - see description
Stability:: May hold, but of type commonly subject to surface motion.

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7/22/2007	Baddog Engineering found AB4130 (NGS Benchmark)	Visit Log
Was here years ago after a nice article in the Omaha World Herald. I'm still chasing benchmarks and now have a neat website to log them on.. Thank you! Baddog Engineering
4/14/2007	woody776 found AB4130 (NGS Benchmark)	Visit Log
This was awesome spent time to enjoy this visit Photos: under the cover This is the original Replica This is a replica of the manhole cover. The real thing The manhole cover and the replica Lots of stuff A monument marking the spot.
4/14/2007	eduCACHEtion found AB4130 (NGS Benchmark)	Visit Log
Yea.
11/15/2006	lyonden_ut found AB4130 (NGS Benchmark)	Visit Log
Stopped by here while hitting my 2K cache at the historical bench mark. Lyonden_ut Murray, Utah
8/27/2006	cachephrase found AB4130 (NGS Benchmark)	Visit Log
Doing a little geocaching and dad and I couldn't resist the allure of lifting the manhole cover. Mark in good shape; the stone has really had a hard life.
7/21/2006	Walker Family found AB4130 (NGS Benchmark)	Visit Log
My first benchmark and what an historic way to start adding these to my list of finds. Thanks to Glen of Rattling Crew for the quick primer on benchmarks.
6/14/2006	Tiggr found AB4130 (NGS Benchmark)	Visit Log
FOUND WITH CHARLIE ON THE KIDS. ON OUR 6000 MILES TRIP ACROSS THE USA. TIGGR
6/14/2006	bella*cacher found AB4130 (NGS Benchmark)	Visit Log
We were along with grandpa GEO*TRAILBLAZER 1 and TIGGR our grandma when we recovered the mark.
6/14/2006	alexis*cacher found AB4130 (NGS Benchmark)	Visit Log
We were lucky enough to be with our Grandpa,GEO*TRAILBLAZER 1 and our Grandma TIGGR when they recovered this mark.
6/14/2006	GEO*Trailblazer 1 found AB4130 (NGS Benchmark)	Visit Log
YEP IT IS STILL HERE. WE HAVE HAD THIS ONE ON THE LIST FOR A LONG TIME NOW AND FINALLY GOT HERE ON OUR WAY TO MEADES RANCH RESET. WE ALSO WAS ABLE TO GET IT ON OUR JOURNEY. Photos: AB4130 GEOCOINS HERE ARE JUST A FEW OF THE GEOCOINS TRAVELING WITH US ON OUR JOURNEY WEST. THE SIGN HERE IS A GOOD EXPLANATION FOR INITIAL POINTS.
6/11/2006	elmoandco316 found AB4130 (NGS Benchmark)	Visit Log
Found marker while at the 6th principal meridian 150th aniversary.
6/10/2006	saso_362 found AB4130 (NGS Benchmark)	Visit Log
Also there for the 150th celebration! Photos: History in plain view!
6/10/2006	Jokester found AB4130 (NGS Benchmark)	Visit Log
I saw this one on the 150th anniversary of the 6th Principal Meridian. Not being either native born or a surveyor, I never knew this mark was so special. But hearing most of the surveyors today refer to it as "hallowed ground", I realize it's more special than I can comprehend.
6/10/2006	awhsom found AB4130 (NGS Benchmark)	Visit Log
this was the focal point of todays event. saw both the manhole cover, and the actual marker.
11/25/2005	KanOkie found AB4130 (NGS Benchmark)	Visit Log
Found this benchmark and several others while looking for "The 6th Principal Meridian" cache.
10/19/2005	Russ and Dana found AB4130 (NGS Benchmark)	Visit Log
Saw this benchmark while searching for the "The 6th Principal Meridian" geocache. Pretty special place.
9/22/2005	Movinslow found AB4130 (NGS Benchmark)	Visit Log
Yep, It's still there. Photos: Big Marker!
7/5/2005	RattlingCrew found AB4130 (NGS Benchmark)	Visit Log
You just never know what you might find in kansas, OK, maybe Nebraska, maybe both! What a historic marker! Photos: The Palte over the original
6/24/2005	StripeMark found AB4130 (NGS Benchmark)	Visit Log
Found in GOOD condition. Beautiful site! NOTE::::: the marker is the brass survey marker BENEATH the manhole cover and NOT the manhole cover itself! [This entry was edited by StripeMark on Monday, October 24, 2005 at 8:53:53 AM.] Photos: manhole cover and 4 brass caps manhole cover over disc manhole cover removed disc on original stone disc close-up east brass cap north brass cap west brass cap south brass cap
9/15/2004	CallawayMT found AB4130 (NGS Benchmark)	Visit Log
Found this historic Intial Point for 5 states in excellent condition and just as described in 1987 during the corners' perpetuation celebration. The corner sits in a lonely backroad location and is well protected by the concrete slab and very tight and heavy manhole lid. This is my seventh initial point in the last 14 months and is by far the best job of perpetuation by the surveying societies. It will easily last for another 150 years. Photos: 6th Principal Meridian Initial Point - KS & NE The brass cap embedded in the original stone. 6th Principal Meridian Initial Point - KS & NE The brass cap and stone inside the manhole. 6th Principal Meridian Initial Point - KS & NE The manhole 6th Principal Meridian Initial Point - KS & NE The manhole lid. 6th Principal Meridian Initial Point - KS & NE Looking South into Kansas 6th Principal Meridian RM East - KS & NE 6th Principal Meridian RM North - Kansas 6th Principal Meridian RM South - Nebraska 6th Principal Meridian RM West - KS & NE 6th Principal Meridian Initial Point information 6th Principal Meridian Initial Point Plaque Dedication plaque 6th Principal Meridian Initial Point Memorial Red Granite Memorial Wyoming Society 6th Principal Meridian Initial Point Memorial Colorado society 6th Principal Meridian Initial Point Memorial Kansas Society 6th Principal Meridian Initial Point Memorial Nebraska Society 6th Principal Meridian Initial Point Memorial South Dakota Society

Documented History (by the NGS)

1/1/1987 by BLM (MONUMENTED)

DESCRIBED BY BUREAU OF LAND MANAGEMENT 1987 THE MARK IS LOCATED AT THE KANSAS-NEBRASKA STATE LINE AND AT THE COMMON CORNERS OF THAYER AND JEFFERSON COUNTIES, IN NEBRASKA, WITH REPUBLIC AND WASHINGTON COUNTIES IN KANSAS AND IN A BLADED ROAD INTERSECTION. TO REACH THE MARK FROM MAHASKA, KANSAS, GO WEST ON COUNTY ROAD 702 FOR 0.6 MI (1.0 KM) TO A CROSSROAD. TURN RIGHT AND GO NORTH ON AVENUE 558 FOR 1.0 MI (1.6 KM) TO THE NEBRASKA-KANSAS STATE LINE AND THE MARK IN THE CENTER OF A ROAD INTERSECTION. THE MARK IS A U.S. BUREAU OF LAND MANAGEMENT BRASS CAP, CEMENTED INTO A DRILLED HOLE IN THE CENTER OF THE OLD, ORIGINAL, 8 BY 14 INCH BLOCK OF SANDSTONE. THE CAP BEARS THE COMPLETE STAMPING OF--6TH PM T1N R1W R1E S 36 S 31 S 1 S 6 T1S INITIAL POINT 1987. THE BLOCK OF SANDSTONE IS ONE FOOT BELOW THE TOP OF A 24-INCH MANHOLE COVER AT THE CENTER OF A 24 BY 24 FOOT (7.3 M) CONCRETE SLAB. THE MANHOLE BEARS THE LETTERING OF--6TH PM NEBRASKA KANSAS 11 JUNE 1856 11 JUNE 1987 36-1N-1W 31-1N-1E 1-1S 1W 6-1S 1E 40 N. LAT. THE MARK IS 1 CHAIN WEST OF A MEMORIAL MONUMENT WHICH CONSISTS OF A 4-FT SPIRE OF POLISHED RED GRANITE FROM COLORADO, SET ONTO A 3-FOOT PILE OF CEMENT RUBBLE STONES FROM WYOMING AND WESTERN NEBRASKA. OVER THE STONES, AND AROUND THE BASE OF THE SPIRE, ARE SLABS OF POLISHED RED GRANITE ENGRAVED WITH THE STATE SEALS OF EACH OF THE STATES. THE MARK IS ALSO 43.61 FT (13.29 M) SOUTHEAST OF TRIANGULATION STATION MERIDIAN, 10 FT (3.0 M) SOUTH OF A BRASS CAP STAMPED SIXTH PRINCIPAL MERIDIAN NORTH, 10 FT (3.0 M) NORTH OF A BRASS CAP STAMPED SIXTH PRINCIPAL MERIDIAN SOUTH, 10 FT (3.0 M) WEST OF A BRASS CAP STAMPED BASE LINE NEBRASKA KANSAS 1987 AND 10 FT (3.0 M) EAST OF ANOTHER BRASS CAP STAMPED BASE LINE NEBRASKA KANSAS 1987. THE MARK MAY ALSO BE REACHED FROM REYNOLDS, NEBRASKA, BY GOING WEST ON STATE HIGHWAY 8 FOR 1.5 MI (2.4 KM) TO A CROSSROAD. TURN LEFT AND GO SOUTH ON A DIRT ROAD FOR 4.0 MI (6.4 KM) TO THE MARK. THIS DIRT ROAD IS IMPASSABLE WHEN WET.

8/21/1995 by NEDR (GOOD)

RECOVERY NOTE BY NEBRASKA ROADS DEPARTMENT 1995 (GT) RECOVERED IN GOOD CONDITION.

5/21/1997 by NGS (GOOD)

RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1997 (CSM) RECOVERED AS DESCRIBED.

Control Text

The horizontal coordinates were established by GPS observations and adjusted by the National Geodetic Survey in June 1996.
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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