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Details for Benchmark: MZ1473

N 42° 51.683 W 072° 06.484 (NAD 83)

Altitude: 3170

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

Location:
In CHESHIRE county, NH View Original Datasheet
Designation:
MONADNOCK
Marker Type:
drill hole
Setting:
in rock outcrop
Stability:
Mark of questionable or unknown stability.

Reference Points

Must Read!

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Hiked up and saw this while enjoying the view.

Made the hike today and found it.

Interesting piece of history. Photo taken 8/25/09.

[Photos:]
photoStation mark on summit of Monadnock.

Hiked up the mountain with a Meet Up hiking group. Took some of the lesser used trails and figured this bench mark would be listed some where for logging. I really enjoy find these and other markers. Just wish I knew more about how to read the data sheets for them. Maps and surveying are some interesting things.

This one is an easy find as long as you can get the muggles away from the spot!
Zambesiboy - a long way from home!

I hiked up here with KayakKouple and 76-CJ7 and found all 3 BMs on the summit.

Hiked up the Halfway House Road, Side Foot Trail and then the White Arrow Trail to the summit and descended by the White Cross. I was delighted to find this very old benchmark on top. In the evening at Currier's House B&B, I read an old book, The Grand Monadnock, by Allen Chamberlin, that described the purpose of the additional lines pointing out from the triangle as indicating the direction of Mount Wauchusett, Mount Tom, and other peaks visible from the summit.

The Annals of the Grand Monadnock
By Alan Chamberlain
Published by The Society for the Protection of New Hampshire Forests
Concord, NH 1936 pp.104-5

"The instrument station used by the United States Coast and Geodetic Survey in 1861 is not on the very tip-topmost rock of the summit, but on a broader ledge some eight feet south of the highest point and about a foot lower. The station is marked by a half inch drill hole close beside which is an iron bolt which projects a little above the rock. Surrounding the drill hole and bolt a triangle with ten inch sides has been chiselled, and radiating from the drill hole short lines have been cut in the rock indicating the directions in which to look for Gunstock Mountain near Lake Winnipesaukee, the Uncanoonuc Mountains near Manchester, Wachusett Mountain in Massachusetts, Bald Hill in Union, Connecticut, and Mt. Tom in the Connecticut River valley near Northampton, Mass. Round about the triangle there are five other drill holes, each enclosed in a square. These are the “witness marks.” About a foot southeast of the Coast Survey marks a bronze disk was set in the rock during the summer of 1931 by the United States Geological survey. On the actual summit rock north of these stations the then accepted elevation, 3166 feet, has been both chiselled and painted. A more recent determination by the Geological Survey make the height 3165 feet.”

This entry was edited by Bardenl on Friday, 23 August 2013 at 14:35:39 UTC.

[Photos:]
photoBardenL's geobag next to pin, drill hole, triangle

Found the drill hole, triangle and adjacent benchmark disk, see picture posted to MZ1474.

Found.

Great weather for a hike. Lots of folks at the summit.

[Photos:]
photoBenchmark in triangle and the nearby MZ1474 disk.

Found at the summit this day after a hike up with my daughter, a student at Keene State College. We used the nearby reference lines to identify Wachusett Mountain in Massachusetts.

Found this one on a hike with Troop 54.

Found while hiking with Millbury, MA Cub Scout Packs 109 & 108

[Photos:]
photo2011-08-13 15.31.58
photo2011-08-13 15.34.34

Found this one and the other benchmark after hiking up the Dublin trail on this beautiful day

Found RM8, a disk set in 1937 by the Massachusetts Geodetic Survey. It was reset in 1959 with a new disk.

Still need to find all the reference points..

Log at 7/17/08 was most helpful in figuring out what I discovered.
I can't wait to climb the mountain again to find all the bench marks!

[Photos:]
photoDSC07650

Found this but forgot to take a picture.

Found on a beautiful day.

Found on a nice spring day hike.

[Photos:]
photoMZ1473
MZ1473 drill hole and surrounding markings

located under his foot, he was cold and didn't want to move

[Photos:]
photoDSCN2356

I found this drill hole today and also the nearby benchmark and references (logged seperately).

It's interesting reading the background info below.

Another great view!

After a six hour round trip climb, we reached the summit of Mt. Monadnock. a great experience.

[Photos:]
photoBenchmark, Mt. Monadnock, NH
Cristy and Scotty with the Benchmark!

Hi All, Geospaz and I hiked the Grand Monadnock. 6.5 mile round trip. Up the white Cross trail, to the summit, down the Pumpelly to the cascade trail.

Great day to hike.

Kruegerfour

Benn a while since I've been up here. Found mark in good condition.

[Photos:]
photoDSC03555

Found it. There were oodles of muggles about.

Found it on this crystal clear day. The temperature was below freezing and with the windchill it was below zero.

Found actual station as described by PapaBear below.

Found this benchmark to be truly unique by the many times in the past I have touched it, but this past Christmas day climb was most memorable~
The weather was mix, cloudy and cold with snow and ice cover.
As always, the climb was exciting event for me. Past about 8 brave souls coming or going this day.

Found with BomberJjr while hiking the mountain.

[Photos:]
photoIMG_4179

Found RM7 after a scenic hike with students form Salzburg, Austria and Peterborough, NH.

All the best from Salzburg -

frizzfrazz

I have seen a brass pin with a triangle around it before (Mt. Wachusetts is one place) but I don't believe I have seen one with five site lines radiating from it. T
Thanks Papa Bear NYC for your great explaination for these lines.

Forgot to take a photo, clear day. We'll be back.

Very, very unique!

Found on this beautiful day for a hike up the mountain.

Monadnock is one of the most unique markers in existence. The triangle with a hole in the center is not uncommon, but the 5 radiating lines are surely one-of-a-kind. I always wondered what the lines were for, perhaps range lines. Surely they must point to something.

The two extra holes on either side of the station drill hole are also mysterious. One has the impression that they kept drilling holes until they finally got it right. Or perhaps the extra holes were added later for unknown reasons.

One of the logs below speculated that the five lines pointed back to reference marks, of which there were originally five - all drill holes with arrows pointing to the station. I decided to check the alignment, so first I aligned the marker itself (on the photo) using the USGS marker as a guide. The first photo shows this: the photo of the station is oriented true north a best I could do it. The triangle is pointing almost north (perhaps a coincidence), the pair of two lines point toward the northeast, and the set of 3 lines point towards the south.

Next I made a scale diagram if the RMs using the positions and directions from the data sheet. This is shown in the second picture. Then I superimposed the aligned marker photo onto this diagram - see the 3rd picture.

[b]Oops! no match.[/b] Even if my alignment or positioning was off, there is no way these lines could be made to align with the RMs. [u]However, RM 1 and RM 2 do seem to line up with the last 2 of the 5 radiating lines[/u], so let's remember that.

Then I happened to look at a map I had made showing all the original survey stations established in the 1850s and 1860s, and how the stations were interconnected. See the 4th picture for this map. There just happened to be 5 other stations connected to Monadnock, so I had another idea: the "5 mystery lines" were pointing to these other stations.

So once again I superimposed the photo of the marker onto the map (5th picture). [b]Bingo![/b] The alignment of all 5 radiating lines is excellent; clearly this was no coincidence. (It's also known that for early stations they often marked the directions to nearby stations, usually by making drill holes at the appropriate directions around the station, so this is just a variation on that practice.)

[b]Conclusion: the 5 lines radiating from the station drill hole are range lines pointing to the 5 other stations that were connected to this station in the triangulation survey done in the 1850s and 1860s.[/b] So, starting at the most northerly pointing line, they point to 1) [u]Gunstock[/u] (on Belknap Mountain, south of Lake Winnipesaukee, NH), 2) [u]Unkonoonuc[/u] (near Manchester, NH), 3) [u]Wachusett[/u] (near Leominster, MA), 4) [u]Bald Hill[/u] (near Stafford, CT) , and 5) [u]Mount Tom[/u] (near Holyoke, MA). [b]And also RM 1 and RM 2 point to 2 of these stations:[/b] RM 1 to [u]Bald Hill[/u] and RM 2 to [u]Mount Tom[/u][/b].

[b]Case closed![/b]

[This entry was edited by Papa-Bear-NYC on Saturday, November 15, 2008 at 12:30:47 PM.]

[Photos:]
photoMonadnock station
This shows the station mark properly aligned with north at the top.
photoMonadnock Site Diagram with old RMs
This is a scale diagram of the station with the 5 original drill hole reference marks. All of these marks are still there and in good condition.
photoMonadnock Site Diagram with old RMs and station
This is a scale diagram showing the original RMs with the image of the station marker superimposed. The 5 lines DO NOT point to the 5 RMs, although RM1 and RM2 are in close alignment with two of the lines..
photoMonadnock Tiangulation Map
This is a screenshot of a Google Map showing the stations of the original East Coast triangulation done in the 1850s and 60s. The stations connected to Monadnock are highlighted
photoMonadnock Tiangulation Map with station
This is the same triangulation map with the image of the station superimposed. The alignment of the 5 radiating lines at the station show excellent agreement with the triangulation lines to the 5 stations connected to Monadnock in the survey.

Found it while having an amazing day of geocaching and mountain climbing.

I spent July 16, 17 & 18 doing some benchmark hunting in Massachusetts, New Hampshire and Maine. My goal was to sacrifice quantity for quality and search for some of the marks set in the early surveys of the area in the 19th century.

[b]Note: there are 4 disks on the summit and a large number of drill holes. [u]The station is not a disk:[/u] it's a hole in a triangle with five lines radiating out from it. It's unmistakable. If you find only a disk, you did not find the station.[/b]

Thursday the 17th was devoted to Monadnock and Watatick. Although I had climbed Monadnock before, and the stations are often recovered, I decided I would find the station [b]and all 10 of the reference points[/b] mentioned in the NGS logs. There are 5 drill holes set with the station mark in 1861, each with a square chiseled around the hole and an arrow pointing to the station. Then there are the three disks set in 1937 (#8 was replaced in 1959) by the Massachusetts Geodetic Survey. There is the old Borden station set in the 1830s (pre-dating the station by about 25 years) and lastly the USGS disk (a separate station - see MZ1474) about 1 foot away from the station, and set in 1957.

[b]Note to those tempted to find all of these:[/b] there was an error when the NGS put the log in for 1896 - a line got dropped so that the information for RM3 runs into that for RM5 and RM4 got left out. The original documentation is included in this log with all the information intact.

I have also included a site digram with all points drawn to scale for those interested.

It is one of the great places to visit in New England - and I'm told it's the most often climbed mountain in the world. I was lucky to get there early and for a while had the summit to myself. It's not unheard of to find 100+ people on the summit. But it's not an easy climb. It took me about an hour and a half including some scrambling on rocks. But if you are reasonably fit - go for it. You'll not regret it.

[Photos:]
photoMZ1473 MONADNOCK, Jaffrey NH
View of the top from the White Dot trail about a half mile below the summit.
photoMZ1473 MONADNOCK, Jaffrey NH
Scale diagram showing the location of all marks.
photoMZ1473 MONADNOCK, Jaffrey NH
Eye level view of the station with the USGS disk (MZ1474) on the right.
photoMZ1473 MONADNOCK, Jaffrey NH
Closeup of the station. The center hole is the mark. The other hole and the iron bolt were added later. The 5 chiseled lines are range lines pointing to other stations. It must be one of the most unique mark you will find anywhere.
photoMZ1473 MONADNOCK RM1, Jaffrey NH
RM1 one of the five original reference marks.
photoMZ1473 MONADNOCK RM2, Jaffrey NH
RM2, one of the five original reference marks.
photoMZ1473 MONADNOCK RM3, Jaffrey NH
RM3, one of the five original reference marks.
photoMZ1473 MONADNOCK RM4, Jaffrey NH
RM4, one of the five original reference marks. The chiseled square has worn away but the arrow is visible.
photoMZ1473 MONADNOCK RM5, Jaffrey NH
RM5, one of the five original reference marks.
photoMZ1473 MONADNOCK RM6, Jaffrey NH
RM6, a disk set in 1937 by the Massachusetts Geodetic Survey. You can just see the "6" under the arrow in the center.
photoMZ1473 MONADNOCK RM7, Jaffrey NH
RM7, a disk set in 1937 by the Massachusetts Geodetic Survey. Notice the two typos: "1860" was changed to "1861" and the RM NO. "8" was changed to "7". I bet that summer intern was not rehired!
photoMZ1473 MONADNOCK RM8, Jaffrey NH
RM8, a disk set in 1937 by the Massachusetts Geodetic Survey. It was reset in 1959 with a new disk.
photoMZ1473 MONADNOCK Borden, Jaffrey NH
This hole was used by Simeon Borden as part of his Survey of Massachusetts done in the 1830s. It's the oldest mark on the summit, and has a distinct shape which differs from all the other holes.
photoMZ1473 MONADNOCK, Jaffrey NH
Documentation from CGS Special Pub. No. 76 "Triangulation in Masasachusetts" (1922)

Found it.

Not a benchmark seeker but found this one easy enough.

Found the Benchmark with my family while hiking the first time Mt. Monadnock. Looks good to me. Very interesting, the original datasheet listed the benchmark at 3170 feet but the elevation of the mountain is only 3165 feet.
King Hubi

[Photos:]
photoMZ1473 - MONADNOCK [closeup]
photoMZ1473 - MONADNOCK RM 6 [closeup]
photoMZ1473 - MONADNOCK RM 7 [closeup]
photoMZ1473 - MONADNOCK RM 8 [closeup]
photoMZ1473 and MZ1474 together
photoMZ1473 and MZ1474 together again
photo3166 FT

Wasn't looking for benchmarks but happy to find this. Great Hike. TFTF

Beautiful day for a hike. Lovely time with Meandmydogs, Kayak Kouple, and Hockeypuck. Thank you.

Out hiking with MAMD , HockeyPuck & Team Bullis...what a beautifaul day & lots of people

cool

I found this drill hole while looking at the reference marks on the Monadnock summit. I assumed it was a missing RM disk and didn't realize it was a benchmark.

Found while caching on the mountain.

Found station as described. Unusual to find just a hole like this. Lots of other people looking for the benchmarks, too.

I guess I saw this one too. Also found RM #6 and #7 but logged and posted photos with MZ1474. Need to find RM#8.

[This entry was edited by Revenge of the Den Leader on Tuesday, December 18, 2007 at 12:12:23 PM.]

Found while hiking

I sort of expected that this drill hole might be separate mark, turns out it was good I got a picture of it too. Didn't search for the reference marks but its the first time I've seen the reference mark locations provided on the mark itself.

GO$Rs

[Photos:]
photoMZ1473 (drill hole w/triangle) with MZ1474 (disk)
photoMONADNOCK (drill hole) CHESHIRE county, NH
5 lines are directional references back to the reference marks.

I guess I accidentally found this one!

Took a little time to see this as the summit was mobbed the first time I went over it but on the way back from the cache I was able to find it as pictured in several of the logs.

We actually found it by accident! Easy and fun!

Found. woot.

Beautiful views from the top.

found it in a torrential downpour. quite the adventure hiking down in a river

quick find been seeing these bench marks for years!! love monadnock!!

[Photos:]
photothere it is !!

That disk is sure beat up. It's a shame that people can't respect such things...

Great view from this spot. Didn't realize there was more than one benchmark up there, but I got this one in the upper left corner of my picture.......

[Photos:]
photoP1010013.JPG

Found as described!

[Photos:]
photoMZ1473 - Mt. monadnock, NH Drill Hole
photoMZ1473 Refrence Mark ??
photoMZ1473 Refrence Mark ??

I had to go back up to get this mark. When I got the other one last week I didn't know that all the other holes were a benchmark. The last time I was there I just took a pic of the disk as I had no discription of what was on the mountain. Found this station in muck better condition than the disk.

[Photos:]
photoStation
Monadnock
photoStation and disk
Monadnock

just happen to come accross this one while doing a summit.

Hiked up with Po' Boy. Easy enough find.

Found on a beautiful day in May with my friend Painted.

[Photos:]
photobenchmonad2.JPG

how often can you get a two for one benchmark?
triangle is still visible despite large amounts of traffic

[Photos:]
photorod enclosed in triangle

Found this one easily and we didnt even know it was up here. We stumbled apon it. We like the arrow pointing true north nearby.

[Photos:]
photoArrow and benchmark
This is the arrow pointing true north, The benchmark is in the middle (its the hole).

It was a great day for a hike with Boy Scout Troop 338 from Charlton Mass. We learned about GPS's, maps and compasses.

Thanks, Scout338

Nice views.

Found easily during our hike on Mondadnock today.

Lots of holes and petroglyph-graffiti. Found the station and the three reference discs, though two are largely unreadable.

[last edit: 9/6/2003 5:41:05 AM PST]

[Photos:]
photoStation and adjacent disc
photoreference 6
photoreference 8

Actually, I've found this one several times in the past, but never knew about benchmarking. In fact, I'll bet the first time I found it, this website didn't exist. I haven't visited Monadnock since last fall, but I figured I could claim credit for this one since I have a picture of the survey disk...

[Photos:]
photomonadnock
photonorth-ish view

Found it when I found the geocache

Easy Find. It was right next to the Benchmark. To find reference points you must use this drill hole and nail, not the official station, for measurements.

Found with alpine climbin

Yikes!! There were a lot of holes up there and I didn't have the description with me. So I didn't know which hole it was. I faintly remeber seeing a hole with radiating lines, but I didn't get a picture so I'm logging this an other.

rdw

Got two of the reference marks and the unstamped disk, but I neglected to photograph the actual mark!

[last edit: 10/13/2002 7:55:58 PM PST]

[Photos:]
photoDisk by the drill hole
photoReference mark #8
photoReference mark #6

Had been here lots of times but this is the first time I specifically looked for the drill hole

Documented History (by the NGS)

01/01/1860 by CGS (MONUMENTED)
01/01/1896 by CGS (GOOD)
DESCRIBED BY COAST AND GEODETIC SURVEY 1896 STATION IS ON THE HIGHEST PART OF MONADNOCK MOUNTAIN, WHICH IS IN THE TOWNS OF JAFFREY, DUBLIN AND MARLBORO. THE STATION IS ON A COMPARATIVELY LEVEL ROCK, WITH A HIGHER ROCK TO THE N. IT IS MARKED BY A DRILL HOLE IN A ROCK. THERE IS A DRILL HOLE BESIDE THE ONE WHICH MARKS THE STATION OPENING INTO IT AND ANOTHER 7/8 INCH DISTANT, WITH AN IRON BOLT IN IT. THERE ARE 5 LINES CUT IN THE ROCK RADIATING FROM THE CENTER HOLE. FIVE REFERENCE MARKS, DRILL HOLES IN ROCKS WITH SQUARES AROUND THEM AND WITH ARROWS POINTING TO THE STATION, ARE LOCATED AS FOLLOWS--NO. 1 DISTANT 11.52 METERS (38.80 FEET), N 4 DEG 21 MIN E. NO. 2 DISTANT 10.78 METERS (35.37 FEET), N 32 DEG 59 MIN E. NO. 3 DISTANT 5.12 METERS (16.80 FEET), S 10 DEG 53 MIN W. NO. 5 DISTANT 5.43 METERS (17.81 FEET), N 87 DEG 50 MIN W. THE BORDEN STATION IS 10.31 METERS (33.83 FEET) DISTANT, N 8 DEG W.
01/01/1932 by CGS (GOOD)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1932 (HSS) STATION MAY BE REACHED FROM THE HIGHWAY BETWEEN JAFFREY AND TROY. AT A POINT ABOUT S OF THE MOUNTAIN A PRIVATE TOLL ROAD RUNS N ABOUT 1.3 MILES TO A SMALL HOTEL, CALLED THE HALF WAY HOUSE, AND FROM THERE A STEEP AND ROCKY, BUT MUCH USED TRAIL LEADS TO THE SUMMIT, THE ASCENT REQUIRING ABOUT 3/4 HOUR. THERE ARE SEVERAL OTHER TRAILS ON THE MOUNTAIN. THE UPPER PART OF THE MOUNTAIN CONSISTS OF BARE LEDGES AND THE SUMMIT IS RATHER SHARPLY POINTED. THE STATION IS MARKED AS DESCRIBED AND I HAD NO DIFFICULTY IN IT WHEN I VISITED THE MOUNTAIN IN 1932. THE TRIANGLE AND 5 RADIAL LINES ARE STILL DISTINCT, ALTHOUGH NOT DEEPLY CUT IN THE LEDGE. THE TRIANGLE, WHICH IS LARGE, APPEARS TO BE CENTERED ON THE HOLE (ONE OF 3 WITHIN THE TRIANGLE) WHICH IS DESCRIBED AS BEING THE STATION POINT. I FOUND MANY DRILL HOLES, OF VARIOUS SIZES, ON THE SUMMIT, SEVERAL OF THEM BEING WITHIN A FEW FEET OF THE STATION, BUT, I FAILED TO IDENTIFY ANY OF THEM, IN A HASTY SEARCH, AS BEING THE REFERENCE MARKS MENTIONED IN THE DESCRIPTION, ALTHOUGH SOME OF THEM MAY STILL EXIST. A U.S.G.S. DISK, UNSTAMPED, IS CEMENTED IN THE LEDGE AT A DISTANCE OF 1.04 FEET IN A SOUTHWESTERLY DIRECTION FROM THE STATION. IT WAS SET BY MR. C.B. KENDALL IN 1931. NEAR THE STATION IS A FIRE LOOKOUT CABIN, CONSISTING OF A MASONRY WALL SURMOUNTED BY SEVERAL WINDOWS ON A LOW ROOF. THE STATION IS ABOUT 5 FEET N OF THE NE CORNER OF THE CABIN. THE VIEW FROM THE SUMMIT IS UNOBSTRUCTED IN ALL DIRECTIONS. A LARGE PART OF THE MOUNTAIN IS IN PUBLIC OWNERSHIP, THE SUMMIT BEING OWNED BY EITHER THE TOWN OF JAFFREY, OR THE SOCIETY FOR THE PROTECTION OF NEW HAMPSHIRE FORESTS, THERE BEING SOME UNCERTAINTY AS TO THE POSITION OF THE BOUNDARY LINE. I FOUND A DRILL HOLE WHICH I TOOK TO BE THE BORDEN STATION, MENTIONED IN THE DESCRIPTION, THE DISTANCE AND AZIMUTH AGREEING WITH THOSE GIVEN. THE HOLE HAS A CONICAL OPENING, WHICH SUGGESTED THAT THE ROCK HAD BEEN CHIPPED AWAY BY SOMEONE WHO MAY HAVE REMOVED THE COPPER BOLT WHICH DOUBTLESS ORIGINALLY WAS IN THE HOLE. NOTE--THIS STATION IS DATED 1860 BUT 1861 IS GIVEN IN THE ORIGINAL DESCRIPTION AND ON THE SKETCHES IN THE ANNUAL REPORTS.
01/01/1937 by NHGS (GOOD)
RECOVERY NOTE BY NEW HAMPSHIRE GEODETIC SURVEY 1937 DRILL HOLE, WITH LARGER DRILL HOLE OPENING INTO IT, ENCLOSED IN A LARGE TRIANGLE IN A FAIRLY LEVEL ROCK, S OF A HIGHER ROCK, AND 5.5 FEET N OF NE CORNER OF STONE FIRE LOOKOUT CABIN, ON THE HIGHEST PART OF MT. MONADNOCK, IN JAFFREY. THE MOUNTAIN ALSO LIES PARTLY IN DUBLIN AND MARLBORO. FIVE LINES CUT IN THE ROCK RADIATE FROM THE STATION DRILL HOLE, AND THERE IS A 1/2-INCH IRON PIN 0.1 FOOT NE FROM IT. A U.S.G.S. STANDARD DISK, UNSTAMPED, SET IN LEDGE IS 1.04 FEET SW FROM STATION. REFERENCE MARKS--IN 1937, THE MASSACHUSETTS GEODETIC SURVEY RECOVERED THE 5 ORIGINAL REFERENCE DRILL HOLES, WITHIN SQUARES, WITH ARROWS, AND ESTABLISHED REFERENCE MARKS NOS. 6, 7 AND 8, MARKED BY U.S.C. AND G.S. STANDARD REFERENCE DISKS SET IN LEDGE. MEASUREMENTS TO REFERENCE MARKS NOS. 2 AND 3 COULD NOT BE CHECKED BECAUSE OF OBSTRUCTION BY FIRE LOOKOUT CABIN, BUT THESE TWO MARKS WERE LOCATED FROM REFERENCE MARK NO. 7, AS GIVEN BELOW. THE 6 OTHER REFERENCE MARKS ARE LOCATED FROM STATION, AS FOLLOWS--ALL DISTANCES AND AZIMUTHS ADJUSTED-- STATION TO SE CORNER FIRE LOOKOUT CABIN, 15.2 FEET. TO NE CORNER, 5.5 FEET. TO NW CORNER, 15.3 FEET. FROM MONADNOCK R.M. NO. 7, 1937, REFERENCE MARK NO. 3 IS 23.54 FEET, IN GEODETIC AZIMUTH 327 DEG 24 MIN 39 SEC. REFERENCE MARK NO. 2 IS 48.55 FEET, IN GEODETIC AZIMUTH 348 DEG 45 MIN 04 SEC. TO NE CORNER FIRE LOOKOUT CABIN, 35.5 FEET. NW CORNER, 23.8 FEET. SW CORNER, 31.0 FEET. FIVE 1/2-INCH DRILL HOLES WERE FOUND IN THE LEDGE IN THE NW QUADRANT, AT FOLLOWING DISTANCES FROM THE STATION, PROCEEDING FROM W TOWARD N. 2.00 FEET, 1.77 FEET, 1.96 FEET, 1.98 FEET, 1.15 FEET. A 10-FOOT TOWER WAS USED IN 1937 FOR THE NORTHERN ARC TRIANGULATION, AND AFFORDED A CLEAR VIEW IN ALL DIRECTIONS. TO REACH THE STATION FROM JAFFREY, FOLLOW ROAD TO MARLBORO WESTERLY FOR ABOUT 5 MILES TO ITS HIGHEST POINT. TURN RIGHT AND FOLLOW PRIVATE TOLL ROAD NORTHERLY FOR 1.3 MILES TO HALF WAY HOUSE. FROM THERE, THE WELL-MARKED WHITE ARROW TRAIL LEADS TO THE SUMMIT, ABOUT A 3/4 HOUR STEEP CLIMB.
01/01/1957 by CGS (GOOD)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1957 (JBW) THE STATION WAS RECOVERED AND THE STATION MARK AND FIVE ORIGINAL REFERENCE MARKS, MARKED BY DRILL HOLES IN ROCK, WERE FOUND AS DESCRIBED. REFERENCE MARKS 6 AND 7, MARKED BY STANDARD REFERENCE DISKS SET IN BEDROCK, WERE FOUND IN GOOD CONDITION. THE DISK HAD BEEN REMOVED FROM REFERENCE MARK 8. A CHECK OF THE DISTANCES AND DIRECTIONS TO REFERENCE MARKS 6 AND 7 SHOWED THE DISTANCES TO BE CORRECT BUT A DIFFERENCE OF 3 FT WAS FOUND IN THE DIRECTIONS. THE OLD DESCRIPTION IS ADEQUATE.
01/01/1959 by CGS (GOOD)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1959 (HRL) THE STATION IS LOCATED ABOUT 35 MILES WEST SOUTHWEST OF MANCHESTER, 33 MILES WEST NORTHWEST OF NASHUA, 3 MILES NORTH NORTHWEST OF JAFFREY AND ON THE HIGHEST PART OF MONADNOCK MOUNTAIN. IT IS 5 FEET NORTH OF THE NORTHEAST CORNER OF A SMALL LOW ROOF CABIN AND 10 FEET SOUTH OF THE HIGHEST POINT OF MOUNTAIN. THE STATION MARK IS A DRILL HOLE IN BEDROCK THAT HAS 5 LINES CHISELED IN BEDROCK THAT INTERSECT THE CENTER OF HOLE. TO REACH THE STATION FROM THE JUNCTION OF U.S. HIGHWAY 202 AND STATE HIGHWAY 124 IN JEFFREY, GO WESTERLY ON STATE HIGHWAY 124 FOR 5.1 MILES TO A SIDE ROAD RIGHT AND SIGN TOLL ROAD, HALF WAY HOUSE. TURN RIGHT AND GO NORTHERLY ON TOLL ROAD FOR 1.3 MILES TO CABINS AND END OF TRUCK TRAVEL. FROM END OF TRUCK TRAVEL FOLLOW FOOT TRAIL TO LEFT OF CABIN AND THEN NORTHERLY UP MOUNTAIN TO CABIN AT TOP OF MOUNTAIN AND STATION. (THE TRAIL WAS MARKED WITH WHITE ARROWS ON ROCK AT THE TIME THE STATION WAS OCCUPIED.) REFERENCE MARK NO. 6 IS SET IN A DRILL HOLE IN BEDROCK ON THE SOUTHWEST EDGE OF SUMMIT AND IS STAMPED MONADNOCK 6 1861. REFERENCE MARK NO. 7 IS SET IN A DRILL HOLE IN BEDROCK AND IS STAMPED MONADNOCK 7 1861. REFERENCE MARK NO. 8 IS SET IN A DRILL HOLE IN BEDROCK AND IS STAMPED MONADNOCK NO 8 1860 1959. A STANDARD USGS DISK IS SET IN A DRILL HOLE IN BEDROCK SOUTHWEST OF THE STATION MARK 1.04 FEET 0.317 METERS WITH NO STAMPING ON DISK. HEIGHT OF LIGHT ABOVE STATION MARK - 1 METER.
10/01/1989 by NHDOT (GOOD)
RECOVERY NOTE BY NH DEPT OF TRANSP 1989 THE STATION IS LOCATED IN JAFFREY, 16.5 KM (10.25 MI) SOUTHEAST OF KEENE, 13.5 KM (8.40 MI) WEST OF PETERBOROUGH, 4.5 KM (2.80 MI) NORTHWEST OF JAFFREY CENTER, ON THE SUMMIT OF MONADNOCK MOUNTAIN. TO REACH THE STATION FROM THE JUNCTION OF STATE ROUTES 202 AND 124 IN JAFFREY, GO WEST FOR 3.4 KM (2.10 MI) ON ROUTE 124 TO A ROAD ON THE RIGHT TO MONADNOCK STATE PARK. TURN RIGHT AND GO NORTH FOR 2.1 KM (1.30 MI) ON THE ROAD TO POOLE ROAD ON THE LEFT. TURN LEFT AND GO WEST FOR 1.2 KM (0.75 MI) ON POOLE ROAD TO A PARKING AREA AND THE END OF TRUCK TRAVEL. PACK ALONG THE WELL-MARKED TRAIL FOR 1 AND 3/4 HOURS TO THE TOP OF MONADNOCK MOUNTAIN AND THE STATION AT THE HIGHEST POINT. THE STATION IS A DRILL HOLE IN BEDROCK FROM WHICH 5 CHISELED LINES RADIATE, 0.317 M (1.040 FT) NORTHEAST FROM AN UNSTAMPED USGS BENCH MARK DISK. REFERENCE MARK 6 IS A STANDARD USGS DISK 26.60 FT (8.11 M) SOUTH FROM THE STATION. REFERENCE MARK 7 IS A STANDARD USGS DISK 33.76 FT (10.29 M) NORTHWEST FROM THE STATION. REFERENCE MARK 8 IS A STANDARD USGS DISK 19.11 FT (5.82 M) EAST FROM THE STATION.
06/24/1992 by (GOOD)
RECOVERED 1992 RECOVERED IN GOOD CONDITION.

Control Text

  • The horizontal coordinates were established by GPS observations and adjusted by the National Geodetic Survey in July 1997.
  • 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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