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Details for Benchmark: AA5521

N 42° 16.850 W 083° 44.450 (NAD 83)

Altitude: 873.32

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

Location:
In WASHTENAW county, MI View Original Datasheet
Designation:
1011
Marker Type:
survey disk
Setting:
set into the top of a round concrete monument
Stability:
May hold, but of type commonly subject to surface motion.

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Spotted while in the area for a campus tour.

[Photos:]
photoAA5521 Benchmark
located in Ann Arbor, MI
photoAA5521 Benchmark Area
located in Ann Arbor, MI

Spotted this one while walking around Ann Arbor on FallFunDay with 5*Terrain.

[Photos:]
photoAA5521

Never would've even thought to look at this unless I was searching for it. cool to see.

Found it.

[Photos:]
photoAA5521

Happened upon this one by chance as I was returning from a wet geocaching walk. Found in soggy condition at the designated location. -marqueA2

[Photos:]
photoBenchmark No. 1011

found in good condition. coord's N .865 W .459

Spotted this benchmark on my way to meet a friend this morning.

My first benchmark find! In my mind's eye, I had pictured them larger than they actually are.
Nice, easy find though.
-PolarPal

Found in location as described, on second night of Art Fair.

[Photos:]
photoBenchmark AA5521 (Ann Arbor 1011)

This was a busy corner today since it is student move-in week here at U of Michigan.
Team Albertelli (Megan and Guy)

[Photos:]
photoAA5521 mark - Ann Arbor, MI
photoAA5521- Ann Arbor MI - view south from mark
N 42° 16.872 W 083° 44.460

I just love those Ann Arbor City Disks! Very creative. GPS was a Magellan Companion.

Yup it is still there after a 11 years :) Took a couple photos while I was there.

[Photos:]
photomarker
photolooking north
photolooking west
photoLooking South
photoMore South
Just to give you a nice shot of the State theater.

Documented History (by the NGS)

01/01/1993 by MI0150 (MONUMENTED)
DESCRIBED BY CITY OF ANN ARBOR MICHIGAN 1993 (GD) STATION 1011 IS LOCATED AT THE SOUTHWEST CORNER OF EAST HURON STREET AND SOUTH STATE STREET, SAID STATION BEING IN THE NORTHEAST 1/4 OF SECTION 29, ANN ARBOR TOWNSHIP, IN THE CITY OF ANN ARBOR, MICHIGAN. THE STATION IS LOCATED 1.1 FT (0.3 M) NORTH OF THE NORTH EDGE OF THE 5 FT (1.5 M) CONCRETE WALK ALONG THE SOUTH SIDE OF EAST HURON STREET AND 1.0 FT (0.3 M) WEST OF THE WEST EDGE OF THE 10 FT (3.0 M) CONCRETE WALK ALONG THE WEST SIDE OF SOUTH STATE STREET. SAID STATION IS A VERTICAL CONTROL MONUMENT AND IS DESCRIBED AS THE 1993 EDITION OF THE CITY OF ANN ARBOR BRASS DISC, WHICH IS SET IN CONCRETE PER DETAIL II AND IS FLUSH WITH THE GROUND. THIS POINT WAS SET BY THE CITY OF ANN ARBOR IN 1993.

Control Text

  • The horizontal coordinates were scaled from a topographic map and have an estimated accuracy of +/- 6 seconds.
  • The orthometric height was determined by differential leveling and adjusted by the National Geodetic Survey in August 1995.
  • 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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