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Details for Benchmark: AA5197

N 39° 44.912 W 105° 23.955 (NAD 83)

Altitude: 6927

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

Location:
In CLEAR CREEK county, CO View Original Datasheet
Designation:
FOUR
Marker Type:
horizontal control disk
Setting:
abutments and piers of large bridges
Stability:
Probably hold position/elevation well.

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found this one while grabbing the nearby cache.

[Photos:]
photophoto~27
photophoto~28
photophoto~29

I didn't have my benchmarks loaded, but I spotted it while finding cache.

[Photos:]
photoFour
N 39° 44.919 W 105° 23.953

Grabbed this while doing a nearby cache.

mr.volkswagen
Canon City, CO

[Photos:]
photoAA5197 Upclose
photoWitness Post
photoThe Closed Tunnel

The hubby found this benchmark while doing the nearby cache.

Found this while geocaching and stopped for Rest For The Wicked IV cache.

nice spot for an easy to find BM

G

[Photos:]
photoaa5197.JPG.jpg
photoaa5197tunnel.JPG.jpg

Horizontal Control Disk FOUR was recovered as described, in good condition.

[Photos:]
photoAA5197 20070423 G (Clear Creek Co., CO)
Horizontal Control Mark FOUR w/GPSr.
photoAA5197 20070423 C (Clear Creek Co., CO)
Horizontal Control Mark FOUR.
photoAA5197 20070423 B (Clear Creek Co., CO)
Horizontal Control Mark FOUR from Eye Level.
photoAA5197 20070423 A1 S (Clear Creek Co., CO)
South at Horizontal Control Mark FOUR.
photoAA5197 20070423 A2 SW (Clear Creek Co., CO)
Southwest at Horizontal Control Mark FOUR.

Pretty well marked...

Witness post at the corner of the bridge makes it way too easy to find. That and the gps zoomed right into it.

Documented History (by the NGS)

01/01/1992 by NGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1992 (RSC) THE STATION WILL BE USED DURING A GPS PROJECT. THE STATION IS APPROXIMATELY 12 MI (19.3 KM) WEST OF GOLDEN ALONG U.S. HIGHWAY 6 AND STATE HIGHWAY 119 AT STATE HIGHWAY 119 MILEPOST 0.3 IN THE CENTER OF SECTION 36, T 3 S, R 72 W, 6TH P.M. OWNERSHIP--COLORADO DEPARTMENT OF TRANSPORTATION. TO REACH THE STATION FROM THE TRAFFIC LIGHT AT THE EAST JUNCTION OF U.S. HIGHWAY 6 AND STATE HIGHWAY 119, GO NORTH ON STATE HIGHWAY 119 FOR 0.3 MI (0.5 KM) TO THE STATION ON THE LEFT. THE STATION IS A BRASS DISK SET FLUSH IN THE NORTH ABUTMENT OF A BRIDGE OVER NORTH CLEAR CREEK. IT IS 170.3 FT (51.9 M) NORTH OF THE NORTHEAST FACE OF TUNNEL NUMBER 4, 34.5 FT (10.5 M) NORTH OF THE CENTER OF NORTH CLEAR CREEK, 18.7 FT (5.7 M) EAST OF THE CENTER OF STATE HIGHWAY 119, 2.5 FT (0.8 M) EAST OF A GUARD RAIL, 1.6 FT (0.5 M) NORTHWEST OF THE NORTHEAST CORNER OF THE ABUTMENT, 4.0 FT (1.2 M) SOUTH OF A FIBERGLASS NGS WITNESS POST, AND 0.5 FT (15.2 CM) ABOVE STATE HIGHWAY 119. DESCRIPTION BY K.A. WILLIAMS, CDOT.

Control Text

  • The horizontal coordinates were established by GPS observations and adjusted by the National Geodetic Survey in May 1995.
  • 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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