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Details for Benchmark: GR0591

N 36° 00.899 W 114° 44.215 (NAD 83)

Altitude: 1234.96

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

Location:
In MOHAVE county, AZ View Original Datasheet
Designation:
ARIZONA BASE
Marker Type:
triangulation station disk
Setting:
light structures
Stability:
Mark of questionable or unknown stability.

Reference Points

Must Read!

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While doing our roadtrip, I didn't think of the benchmarks. I found at least a cache a day, but about benchmarking I was just remembered as soon as I walked this dam. They are everywhere. So when I saw them I took z photo, and now I try to log them.

[Photos:]
photoArizona Base

Since I was traveling from California to Utah alone today, I decided to add a number of hours to the trip and visit the dam. I enjoyed it and I was able to find a few geocaches and benchmarks along the way.

Mark is in great shape.

[Photos:]
photoClose up
photoSurroundings

Visiting the Hoover Dam visiting from Minnesota.

Touring the bridge and dam today and then using www.findbenchmarks.com to find a ton of marks on the dam. I wish I could have had a few more and I would have pulled off a really easy 25 BM day! Oh well.

This one is easy to identify compared to others out here. Mark looks good and is right where it says it should be.

[Photos:]
photoARIZONA BASE 1935 Close Up
photoARIZONA BASE 1935 Setting View
Looking north towards the Arizona intake towers visible on the other side of the dam. That is the south sidewalk on the other side of the garbage can.

Found it during Hoover dam visit.

[Photos:]
photo

Found it with honny during Hoover dam visit.

Found it...

[Photos:]
photo

Visting Hoover with LincolnsAunt and Dirkster.
Graded many of the nearby bench marks

Found as described

[Photos:]
photo

I was in Vegas for a long weekend and spent the morning at Hoover Dam, grabbing the new virtual and searching for benchmarks, before heading to the airport for my redeye home. I was here five years ago and noticed they are all over the place, so why not log them. Spotted this one in good shape.

Another one in good shape and easily readable as 'ARIZONA BASE.' The original description seems more accurate with the 100 feet from the Arizona end of the dam but the 1950 description is more useful describing it as 46 feet South of the Arizona [women's] rest room tower in the first observation niche South of that tower.

[Photos:]
photoARIZONA BASE
photoLooking NNW toward Nevada side of dam

With Jeepers-GasFree

Joyful Noise and I were on Vacation from Michigan (Brrr. and double Brrr). We took a break from finding geocaches to find some benchmarks instead.

We came for the Dam Tour, but found a bunch of Benchmarks too. Easy to find, hard to figure out which is which.

[Photos:]
photoClose-up View of GR0591
photoStep-Back view of Gr0591

Found it

[Photos:]
photo

Mit Stage_Worm diesen Benchmark gesucht und gefunden.....

Auch diesen Benchmark konnten wir schnell finden !!

Also found this one on my walk on the dam.

Cool Location with a lot of Benchmarks here.

Found it on my trip with Iwaraada to Hoover Dam.

OMG! Seems as the whole Hoover Dam is covered with Benchmarks. I found quite a lot, but not sure if I found all of them. Many of them are located just within a couple of feet.

found this LM while visitung the Hoover Dam

tnks Zamorra

[Photos:]
photoGR0591

... on the road with krauswaller ...

TFTBM ... and best regards from austria !!

vacation in california, nevada & arizona together with maybe...
during our sightseeing tour through san francisco we visited awesome locations, found some geocaches and benchmarks.
thanks a lot for this benchmark.
tftbm
greetings from tyrol / austria - krauswaller

Found it on my journey to Hoover Dam

[Photos:]
photoBenchmark - Arizona Base

Found at 13:37 with we4fullers (my brother-in-law's family). I'm down here from the Seattle area for a couple of weeks causing havoc for them.

[Photos:]
photoArizona Base
photoArizona Base

Great day out at Hoover Dam doing some caches and benchmarks with family and brother in law in town from Seattle

[Photos:]
photoARIZONA BASE
photoARIZONA BASE

We walked the dam, and probably looked silly stopping to take pics of all the benchmarks we could see. I expected there to be some, but wow!

Found while walking across Hoover Dam.

Found this Benchmark while our road trip on this awesome monument. It must be been like hell to build this all year long.

[Photos:]
photo

Found during our USA vacation

Benchmark #4 while walking the Hoover Dam.

[Photos:]
photoBenchmark "GR0591"

Found while visiting the dam

[Photos:]
photo

Found this while walking the dam.

Walked the entire length of the dam both sides and photographed all the benchmarks we could find. All we found were in good shape.

Saw this benchmark while visiting Hoover Dam.

[Photos:]
photo

Found it strolling along the Hoover Dam

Found walking on Hoover Dam.

[Photos:]
photoArizona Base

Found it

[Photos:]
photoimage

Adding a few BM while visiting Hoover Dam. Found this one with JCLBA, Tatie and PatrickValerie

I found this waymark while visiting the area with PatrickValerie, Lison55 ans JCLBA.

[Photos:]
photoAB

Found this BM while visiting Hoover Dam with JCLBA, Tatie and Lison55

[Photos:]
photoARIZONA BASE

Discovered while geocaching around the Hoover Dam.

[Photos:]
photo20151111_130950

Its funny to see all the visitors just walking past these benchmarks, but when I stop, bend down and take a close up picture then walk away. other people then scoot over and take a picture too..

Found whilst crossing Hoover Dam with the family.

[Photos:]
photoDSC_0312

Found during our tri-state road trip finding caches, earthcaches, benchmarks, and waymarks along the way.

[Photos:]
photoBM Arizona Base

Found while visiting the dam.

Found while walking across the dam.

[Photos:]
photoThe triagulation disk, GR0591

12:20
Today we drove from Seligman to Las Vegas as part of our RV road trip from Chicago to San Fancisco. Along the way, we followed a part of the historic route 66 and visited the Hoover dam. We ended this day with a walk accross The Strip. We passed the security controls and drove our RV over the dam. I discovered this benchmark by accident.
TFTC and greetings from Belgium!

Discovered this one while visiting the dam.

Looks fine.

[Photos:]
photoGR0591

discovered this one while visiting the dam.

Discovered this one while visiting the dam.

Found while walking along the Hoover Dam today.

[Photos:]
photoARIZONA BASE - GR0591 - Hoover Dam, AZ

Two German make a trip across the pond to the west coast of the US ..
In addition to the usual sightseeing, there was also time by one or another cache or Benchmark.

Together with Raistlin_Storm found on our trip through the Southwest of the United States this benchmark

man are there a few benchmarks on this dam!!!

Found while exploring the dam with the magtfplanner crew !

[Photos:]
photoArizona Base
photoArizona Base Area

Found with spooky_luke whilst exploring the dam

Found while exploring the dam

[Photos:]
photoBM_ArizonaBase

Found whilst exploring Hoover Dam

[Photos:]
photoArizona Base

Found it today at Hoover Dam.

[Photos:]
photoGR0591 Arizona Base Hoover Dam

Found this benchmark along with many others while walking across the Hoover Dam.

[Photos:]
photoAZ Base Closeup
photoAZ Base Area View

Found it while hiking and visiting Hoover Dam with the family.

Found it while chcecking out Hoover Dam, our first incredible stop on a whirlwind trip through Nevada, Arizona and Utah. It is HOT!!!

Hab Dich gesehen!!

[Photos:]
photoArizona Base

Visiting from S. Florida and checking out all the benchmarks on the Hoover Dam. Pretty cool!

[Photos:]
photoGR0591-ARIZONA_BASE-1-20140228
photoGR0591 Gungadoy

Found while touring the dam today.

Found whilst visiting the U.S. together with Turako and Silas07.

Found while visiting Hoover Dam

Found it today at 11:20a

[Photos:]
photoARIZONA BASE

As IXF and I were looking for this base a Japanese couple kept looking at us as we walked around looking at the ground. When we bent over to take the pictures, the couple had to go over after we left and take a picture. I am not sure they knew what it was but saw us take a picture, so it must of been important! to much fun!

[Photos:]
photoAZ Base it is!

Found this while visiting Hoover Dam with Dame Deco.

In the area for the EarthCache Mega Event this weekend, caching in Utah, Nevada, Arizona, and California. Came out to see the Hoover Dam on the last afternoon before catching the plane home to Ohio. Found this benchmark in fine shape. Those are rain spatters in the picture, this benchmark is the last thing I saw here--we had to run for the car and got soaked--but totally worth it to view this awesome place.

[Photos:]
photoBenchmark GR0591, Hoover Dam

We stopped at the Hoover Dam as part of our 6,000 mile road trip. We couldn't resist getting 10+ benchmarks in just a few minutes! I found this with my crew - Universal Warrior, Scooby boy, and Y dance girl!

Found while touring Hoover Dam with my hubby - was thrilled to find many benchmarks along the walk across the top of the Dam.

[Photos:]
photoBM_Arizona_Base

Found it while visiting the dam.

[Photos:]
photoGR0591
photoGR0591

Found in good condition

[Photos:]
photoARIZONA BASE Hoover Dam AZ

Found this spot on our trip to the Hover Dam.

Found while visiting the Hoover Dam. Lots of benchmarks here!

[Photos:]
photoAZ Base

I had never seen a benchmark until today and the Hoover Dam was full of them. I thoroughly enjoyed this so I'll be searching for more of these. This particular one is alive and well.

Visiting Hoover Dam

This entry was edited by DeltaMikeAlpha on Sunday, 28 April 2013 at 21:51:23 UTC.

[Photos:]
photoDSCN1210

We were suprised with how many marks there were here.

Another Benchmark found at the Dam.

:)

Making a Benchmarking trek back and forth across the dam. Snapped a pic.

[Photos:]
photoIMG00328

During our ET & Route 66 trip we also did some sightseeing, we've discovered a lot of Benchmarks, this was one of them.
TFTB.

While doing the E.T.trail, Route 66 and some sightseeing, we (fscheerhoorn, eikenhofjes, M.I.Casa and hoekraam) have seen a lot of Benchmarks, this was one of them.
Greetings from The Netherlands (NL)
TFTBM

While doing the E.T.trail, Route 66 and some sightseeing, we (fscheerhoorn, eikenhofjes, M.I.Casa and hoekraam) have seen a lot of Benchmarks, this was one of them.
Greetings from The Netherlands (NL)

Team M.I.Casa

On my hollyday we found a lot of caches
Thanks for the benchmark

tftb
From [orange]Holland[/orange]

On our trip to the Hoover Dam we also saw this disk.

On 8-4-12 I was married to the intelligent, gorgeous, phenomenally amazing woman known as theladybee! Shortly thereafter we set upon a honeymoon excursion across the western two thirds of our glorious country. We embarked from Columbus, Ohio and spent the next two weeks packing in as much beauty as we could. We would awaken around 8am, drive and explore all day and night until around midnight, find a hotel, go to sleep, and repeat it the next day. We journeyed through 20 states: Ohio, Indiana, Illinois, Missouri, Kansas, Nebraska, Colorado, Utah, New Mexico, Arizona, Nevada, California, Oregon, Washington, Idaho, Montana, Wyoming, South Dakota, Minnesota, and Iowa. We marveled at 8 National Parks: Black Canyon of the Gunnison, Mesa Verde, Petrified Forest, Grand Canyon, Sequoia, Kings Canyon, Yosemite, Badlands. We wondered at 2 National Monuments: Gateway Arch, Devils Tower. We got up close and personal with lynx, elk, rams, bear, prairie dogs, and other varmint. We paid homage to the original stash, the oldest remaining cache, HQ, and even got down at the Block Party. We targeted caches to help us qualify for challenges, to help us create challenges, challenges themselves, earth and virtual caches in the parks, and anything interesting we happened to come across. We drove 7,449 miles in total. The things that awed me, the sensations I experienced, I will remember them always, but they pale in comparison to the time I spent with the lady who is my life. The journey we took will stay with me forever. Thank you for placing a cache that constituted part of our journey.

found in good condition

[Photos:]
photoBM-GR0591

Found while touring the dam.

[Photos:]
photoGR0591
Designation - Arizona Base

[Photos:]
photoARIZONA BASE

Spotted whilst visiting the Hoover Dam.

Recovered as described
edexter

[Photos:]
photoArizona Base Disk setting
photoArizona Base isk and cooridinates

Still there, in good condx.

Found this benchmark while visiting the Dam with friends.

[Photos:]
photo2012-04-18_10-04-24_605

The Zombie Horde was enjoying the view and the history.

[Photos:]
photo982565c8-7f26-4e60-a743-9ab66cb9f298

What an amazing spectacle! This was our first major stop while visiting Vegas.

NEXT TO THE TRASHCAN

[Photos:]
photoAZbenchmark

Spotted this BM while walking across the dam.

[Photos:]
photoGR0591 - Arizona Base
photoGR0591 - Arizona Base

Good Condition

[Photos:]
photoBM-triangulation

Found this one at my holiday

Mlvdburg
The Netherlands

During our ET & Route 66 trip we also did some sightseeing, we've discovered a lot of Benchmarks, this was one of them.

Greetings from [orange]The Netherlands![/orange]

[green]TFTC![/green]

[blue]Happy caching![/blue]

Found this benchmark in great condition. Nice walk across Hoover dam.

[Photos:]
photoGR0591 Stamped ARIZONA BASE - 1935
Close up of benchmark
photoGR0591 Stamped ARIZONA BASE - 1935
Benchmark location

One of 12 marks found on Hoover Dam this day.

[Photos:]
photoAZ Base 11.19.11

another one we spotted while on a tour of hoover dam. found as described.

Stumbled on this while visiting the Hoover Dam.

RECOVERED IN GOOD CONDITION.

Spotted this disk while visiting the Hoover.

While visiting Vegas I took the trip to Hoover Dam. I was a little pressed for time and made it a quick visit.
Snapped a shot of this one on my visit.

[Photos:]
photoArizona Base

[red]Found it on my way to Vegas! Visiting from Alabama![/red]

On vacation with the family and picking up a few BMs as we walk the dam

[Photos:]
photoClose up - GR0591 Arizona Base

While visiting Hoover Damm

Found it while on Damm

Found it with friends from Pennsylvania.

Saw it at the dam.

One of many benchmarks at Hoover Dam. Great place to hunt for BM's.

[Photos:]
photoArizona Base

:)

PBF enjoyed locating this disk while visiting the Dam

a very impressive construction - found the benchmark while visiting the hoover dam and on our powercachingtour through california, nevada and arizona - best regards from austria - kiwilex

Found it on the way to Las Vegas after doing the Route66 Powertrail.
mobilekirk

Found on the way to LV
THX GRAC

Found while touring the Hoover Dam
-jdevor

[Photos:]
photoarizona base

Found it while touring the dam

Found this one while touring the dam today.

[Photos:]
photoArizona Base

Visiting the dam and taking pictures of little metal discs

[Photos:]
photoGR0591 at Hoover Dam

I love this dam and the bridge above :)

Another dam benchmark

Found during our walk on the Hoover Dam. It quite easy to find these here as there are many. martyx (Czech Republic)

[Photos:]
photoAZ Base

Found while visiting the dam

[Photos:]
photoAZBase

Found while walking the Hoover Dam

[Photos:]
photoGR0591

found this while on the way home

On way to Grand Canyon West via Hoover Dam

Found this with Blaise Orange

N 36° 00.908 W 114° 44.214

This is a great bench mark! Designation is big and easy to read.

[Photos:]
photoGR0591

recovered in good condition on the AZ side of the Hoover Dam.

[Photos:]
photo12-AZ Base Hoover Dam

Stumbled upon this one while checking out the Dam.

While caching towards Boulder City, spotted this one while visiting the Hoover Dam.

John of Honeoye Falls, NY

Found while visiting the Hoover Dam and on our way to Boulder City, Nevada.

ElbaPatch, Scott, Elba, NY

Was headed to St. George from Phoenix and stopped at the dam!
NICE!

Found during Las Vegas trip and visit to Hoover Dam

[Photos:]
photoGR0591

wow

My first time in Arizona!

[Photos:]
photoThe Not-So-Close-Up Pic of Ariz Base

Found it while on a mini vacation/road trip with Vargseld.

Found this one while visiting the dam.

[Photos:]
photoThe benchmark

Hard to imagine this one's location is designated "light structures".....looked to us like it wasn't going anywhere!

[Photos:]
photoIMG_1793

Found while enjoying a visit to the Hoover Dam.

[Photos:]
photoGR0591 "ARIZONA BASE" Close-up

Found as described.

[Photos:]
photoGR0591

found it

found it

Our fourth benchmark find on our stop at Hoover Dam on the way to Las Vegas.

[Photos:]
photoBenchmark Arizona Base

Found at the Hoover Dam. Landnavmaster

[Photos:]
photoHoover Dam Arizona Base
Hoover Dam Arizona Base

Wasn't really looking for it, just stumbled across it while crossing the Dam.

[Photos:]
photoGR0591
Who put this next to the trash can?

Found the mark, got a slightly blurry pic LOL

[Photos:]
photoGR0591 marker

Found it today while benchmarking on Hoover Dam

[Photos:]
photoGR0591

Found the Hoover Dam benchmarks on a fabulous trip to the area with Jman51x. We just stumbled upon one, and then had fun finding more!

Found this benchmark touring Hoover Dam.

Found while visiting the dam.

[Photos:]
photobenchmark
photoview near benchmark

Found on a trip to the Dam

Found this one with Fiddlefiend. My GPS had 36 deg 00.910 and 114 deg 44.214. Mandolinman.

[Photos:]
photoGR0591

it is nice to stumble across benchmarks

Grabbed this while visiting the Dam. Not a big hunter for these things, but sometimes you just stumble on one!

That's one big dam!

[Photos:]
photoIt's a benchmark
photoView from near benchmark

There were so many BM's ^^

Found with Igi and MooseMob on our trip to Hoover Dam

Found while visiting Hoover Dam with Moose Mob.

[Photos:]
photowith geolens

Another quick grab with 007. My first time in Arizona and what better way to start the trip off than with a benchmark.

Lots of these around. Surveyors had to have bern real busy back in 1935.

LOVE to find these now!

[Photos:]
photoArizona Base

Found it in the hot Arizona sun!

[Photos:]
photoGR0591 aka Arizona Base

Found this and 4 others on the dam. Spotted 3 more on pillars from the dam.

One of many in both sidewalks all across the dam.

[Photos:]
photoArizona Base

Found it while walking across the dam.

[Photos:]
photoBenchmark Arizona Base, Hoover Dam

Recovered as described.

[Photos:]
photoGR0591 Disk on Hoover Dam
photoGR0591 Area

Found it on Hoover dam.

[Photos:]
photoL:\sr files\SR Photos\vegas 08\1\DSC_9018.JPG

Spent a few hours away from a meeting in Vegas to visit Hoover Dam. Found this one!

[Photos:]
photoFirst one I found I can record!
Found this one on a tour at Hoover Dam. Funny how most people never see these!

Stumbled upon this one while visiting the dam

Went to Hoover Dam on a cold and windy Christmas day. Lots of people there even though the visitor center was closed.

[Photos:]
photoGR0591
photoGR0591 location

Saw these as we walked across the dam. Thanx!

Out hunting benchmarks with Fiddlefiend.

Inadvertently stumbled on 18 benchmarks while visiting from Illinois with Mandolinman. That'll teach us to wander off without our GPS.

FOUND IT! Along with many more!

Found this one on our way back from Vegas.

Awesome place in America.

Just one of several that I found while visiting Hoover Dam.

One of quite a few we found in this area.

[Photos:]
photoIMG_2922.JPG

Found it while visiting the dam.

Found it !!

[Photos:]
photoArizona Base

Found this one easy, the hard part was find this benchmark one was finding the correct benchmark on the website.

after comparing foto's we think this is it

[Photos:]
photogr0591.jpg

Found this one after the dam tour

We weren't really planning on looking for benchmarks during our visit to Hoover Dam, but they were everywhere we looked. Managed to match 9 photos to the descriptions once we returned home!!

[Photos:]
photoGR0591 Arizona Base.JPG

So many markers!!

[Photos:]
photoLas Vegas 265.jpg

Found this while on our Vagas vacation with Daddy D-tour. Spent the day at Hoover Dam and Boulder

Found this with oldest daughter Nightfox while on vacation in Las Vegas, took a road trip out Hoover Dam.

Aloha! After spending so much time in Vegas, we had to get out of town -- Hoover Dam is the place to go! Got this one and several others.

N 36° 00.908 W 114° 44.216

Found ninteen benchmarks on and around the dam today. Had 5m accuracy on this one.

[Photos:]
photoArizona Base

Found this one while taking a visiting friend to Hoover Dam. Thankfully I had my camera as I did not have my GPS.

Found without difficulty!

Mark found in good condition.

[Photos:]
photoBM GR0591

Found after doing the dam tour.

[Photos:]
photoArizona Base Disc - Hoover Dam, AZ.JPG

Found it while loking for a Geocache.

[Photos:]
photoDSC00902.JPG

This was one of a number of benchmarks we saw on our visit to Hoover Dam.

Found it while on vacation to the see the Dam!!

Found this while on vacation.

[Photos:]
photoVacation 2006 351.jpg

Found on the Dam.

[Photos:]
photoDSC05208.JPG

One of several benchmarks that we kept running into... literally.

Nice and quiet out here at 7am on a Saturday morning. One of many found today.

[Photos:]
photoArizona Base
photobm location

Found in good condition.

[Photos:]
photoArizona Base

FOUND NEW YEARS DAY WITH WIFE AND DAUGHTER

Found Arizona Base while walking the dam with the kids.

[Photos:]
photoArizona Base + GPS

One of several benchmarks I stumbled upon at the dam.

[Photos:]
photoARIZONA BASE.jpg
Arizona base

Found it.

[Photos:]
photoArizona Base

Was trying to accomplish a locationless cache today, but we stumbled upon several benchmarks as well!

12:00 PM Found it.

[Photos:]
photoArizona Base

Visiting friends in Az we decided to go to Hoover dam and discovered the bench marks so just had to take some pictures and log the visit. The guides there didnt seem to know what a bench mark was. The dam is very impresive and worth the trip.

Found as described.

Found it!

Found as described.

[Photos:]
photoArizona Base

Found with Skydive121

One of a bazillion benchmarks found here on Friday the 13th. I guess it made paying for parking worth it. Found with Zues_4.

Found it! Thanks for the hunt, glad to have something to find at the dam.

Thanks,

CajunCruzer

[Photos:]
photoArizona Base at Hoover Dam

Got this one as I was walking across the dam to my car. Later added a few regular caches on a trip down the river.

[Photos:]
photoBen at Hoover Dam

Found it!

[Photos:]
photoAZ Base

got it

Recovered in good condition

[Photos:]
photoARIZONA BASE

Found today with many others on the bridge. Clearly marked.

Found it on Hoover Dam. Nice views, impressive structure!

Doofie, The Netherlands

[Photos:]
photoDSC00326.JPG

Found it in OK Condition

Found this one along with 12 others while touring the dam. I wan't even planning on doing any geocaching or benchmark hunting while on this vacation, but I couldn't pass up the opportunity. As I expected, they are well documented and photographed, so I won't add yet another picture to the database.

Found in good condition.

[Photos:]
photoP1010026.jpg

Found with mom

Found this one and others while visiting Hoover Dam.

Easy find at the Hoover Dam!

[Photos:]
photoHoover Dam BM4.JPG

Didn't realize there were benchmarks here until I was walking along the top of the dam. Found this one along with a couple of others.

Recovered in good condition.

I didn't even know you could log benchmarks until I logged a few caches today! But when I was over at Hoover Dam, I just happened to have taken a picture of one!

If I only knew, I would have logged the coordinates...

[Photos:]
photoArizona Base Marker

Located in good condition. US Coast and Geodetic Survey mark.

N 36° 00.902 W 114° 44.214

Marker still readily visible.

[last edit: 8/25/2003 8:54:30 PM PST]

[last edit: 8/25/2003 9:08:09 PM PST]

[Photos:]
photoMarker
N 36° 00.908 W 114° 44.215

Benchmark recovered as described, in good condition. Not very worn at all, but worn enough for the brass to be shiny.

This is a Coast and Geodetic Survey Benchmark (Triangulation Station), but looks like it was monumented by the Bureau of Reclamation.

[This entry was edited by Me & Bucky on Tuesday, November 30, 2004 at 6:57:23 PM.]

[Photos:]
photoArizona Base Benchmark w/GPSr
photoArizona Base Benchmark
photoSouth at the Arizona Base Benchmark

found it

found it

Doing a virtual geocache at the Dam

Found this one in 105° heat. Lots of benchmarks around the dam; located as described.

[Photos:]
photoGR0591

Took a few hours off the tables to see the sights.

Great place to visit and a chance to find a few benchmarks.

Got him! Bookiew and Paulw found this one today some time after 4:30. You go Virginia boys!

Found while geo-caching
Billzjeep

BM set atop walkway on top of Dam--AZ Base disk shows moderate wear

[Photos:]
photoHooverDam AZ BaseTri-Disk

Found this NGS marker while visiting the area searching for a couple of geocaches in the Hoover Dam area.

Found this benchmark by accident when I was on a trip to California to visit my brother. This was before I ever heard of Geocaching, and long before I got my first GPSr. I snapped the attached picture when I was there. After finding this benchmark I went looking for the Nevada Base benchmark and found it with zero problems...

[Photos:]
photoP7030043.JPG
Arizona Base Benchmark as found on July 3rd, 2002

Documented History (by the NGS)

01/01/1935 by BOR (MONUMENTED)
DESCRIBED BY US BUREAU OF RECLAMATION 1935 STATION IS A STANDARD USC AND GS DISK MARKED ARIZONA BASE 1935 AND SET FLUSH WITH THE SIDEWALK. THE STATION IS LOCATED ON THE DOWNSTREAM SIDEWALK OF HOOVER DAM APPROXIMATELY 100 FEET TOWARD NEVADA FROM THE ARIZONA END OF THE DAM.
01/01/1950 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1950 IN HOOVER DAM. ON TOP OF HOOVER DAM, ABOUT 55 YARDS NORTH OF THE SOUTHEAST (ARIZONA) END, 46.0 FEET SOUTH OF THE SOUTHEAST CORNER OF THE ARIZONA REST ROOM TOWER, NEAR THE CENTER OF THE WEST (DOWNSTREAM) SIDE OF BLOCK C, IN THE TOP OF THE CONCRETE FLOOR OF AN OBSERVATION NICHE, 2.2 FEET NORTH OF THE SOUTH WALL, AND 7.8 FEET WEST OF THE EAST EDGE OF THE WEST SIDEWALK.
01/01/1963 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1963 RECOVERED IN GOOD CONDITION.
01/01/1981 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1981 RECOVERED IN GOOD CONDITION.
01/01/1990 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1990 (MG) RECOVERED IN GOOD CONDITION.
01/01/1990 by USPSQD (GOOD)
RECOVERY NOTE BY US POWER SQUADRON 1990 (GG) RECOVERED IN GOOD CONDITION.

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in August 1993.
  • The orthometric height was determined by differential leveling and adjusted by the National Geodetic Survey in June 1991.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The geoid height was determined by GEOID99.
  • The dynamic height is computed by dividing the NAVD 88 geopotential number by the normal gravity value computed on the Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45 degrees latitude (G = 980.6199 gals.).
  • The modeled gravity was interpolated from observed gravity values.

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