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Details for Benchmark: AA8576

N 38° 39.325 W 090° 14.257 (NAD 83)

Altitude: 505

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

Location:
In C OF ST LOUIS county, MO View Original Datasheet
Designation:
CSL-16
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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Station disk not found. Distance measured from manhole and fire hydrant put the location in concrete at the corner that appears newer than surrounding sidewalk. Presumably, sometime after 1990 the sidewalk was replaced to add a curb cut, and the disk lost in the process. No witness post observed.

I did not observe the ?SL-29 1999 disk described by happycycler.

Azimuth Mark found as described at HH2 coordinates 38 39 09.7, -090 14 23.6. Disk was rather overgrown, and there was no witness post. From the 'x' cut in the curb 11.2 feet SE of the disk (11.5 feet as I measured it), go in from the street in a direction perpendicular to the curb to locate the disk.

[Photos:]
photoSetting, CSL-16 (AA8576), St. Louis, MO
View to the northeast, showing hydrant and manhole cover. Presumed location of unfound station disk is indicated by the yellow box. Photographer is standing in Cote Brilliante Avenue; Whittier can be seen on the right.
photoCloseup, CSL-16 Azimuth Mark (AA8576), St Louis MO
photoSetting, CSL-16 Azimuth Mark (AA8576), St Louis MO
View to the northeast. Yellow box indicates location of disk. with respect to hydrant and concrete light pole.
photoX cut, CSL-16 Azimuth Mark (AA8576), St Louis MO
X mark cut in curb ~11 feet from azimuth mark.
photoCloseup, CSL-16 Azimuth Mark (AA8576), St Louis MO
View from street past X mark (red box) in curb toward azimuth mark (yellow box). Photographer is standing in Whittier Street and facing northwest.

I thought that I had found this one. However the disk that I found has ?SL-29 and a 1999 date. Some scratches on the disk, it could have originally read CSL-29.

I can find no information about this being a replacement so I am not sure how to log this one.

I got disoriented and did not search for the azimuth mark.

[Photos:]
photo?SL-29 Disk (scratched)
Note 1999 date.
photo?SL-29 setting
photonearby street signs

Documented History (by the NGS)

01/01/1990 by MODNR (MONUMENTED)
DESCRIBED BY MO DEPT OF NAT RES 1990 STATION, AZIMUTH MARKS AND REFERENCE TIES THE STATION IS IN THE NORTHERLY ANGLE OF THE T-INTERSECTION OF COTE BRILLIANTE AVENUE AND WHITTIER STREET. IT IS 28 FT NE OF THE CENTER LINE OF COTE BRILLIANTE, 19 1/2 NW OF THE CENTER LINE OF WHITTIER, 25.9 FT (7.9 M) SW OF THE CENTER OF A CONCRETE LIGHT POLE, 21.4 FT (6.5 M) EAST OF ANOTHER CONCRETE LIGHT POLE, 14.1 FT (4.3 M) ENE OF CENTER OF A FIRE HYDRANT, 7.09 FT (2.16 M) NE OF THE CENTER OF A CURB INLET M.H. COVER, 1.5 FT (0.5 M) BACK OF CURB AND 2.2 FT (0.7 M) NE AND 0.9 FT. (27.4 CM) SE OF EDGES OF A CONCRETE WALK, AND 2 FT (0.6 M) SW OF A CARSONITE WITNESS POST THE AZIMUTH MARK IS ABOUT 1/4 MILES SW IN THE WESTERLY ANGLE OF THE INTERSECTION OF WHITTIER STREET AND EVANS AVENUE. IT IS 65 1/2 SW OF THE CENTER LINE OF EVANS, 30 FT NW OF T CENTER LINE OF WHITTIER, 44.64 FT (13.61 M) SOUTH OF A CUT (X) ON THE SW CURB OF EVANS, 22.8 FT (6.9 M) SW OF THE CENTER OF A FIRE HYDRANT, 19.1 FT (5.8 M) SW OF THE CENTER OF A CONCRETE LIGHT POLE, 11.2 FT (3.4 M) NW OF A CUT (X) ON THE NW CURB OF WHITTIER AND 1.8 FT (0.5 M) SW AND 1.5 FT (0.5 M) NW OF EDGES OF THE CONCRETE WALK, AND 2 FT (0.6 M) NE OF A CARSONITE WITNESS POST STATION AND AZIMUTH MARK TO REACH TO REACH THE AZIMUTH MARK FROM THE CENTER OF THE GRAND AVENUE INTERCHANGE OF THE DANIEL BOONE EXPRESSWAY (US HIGHWAY 40 AND I-64) GO NORTHEASTERLY ON GRAND AVENUE FOR 1.05 MILES (1.69 KM) TO PAGE AVENUE. TURN LEFT AND GO NORTHWESTERLY ON PAGE FOR 0.8 MILE (1.3 KM) TO WHITTIER STREET TO THE AZIMUTH MARK ON THE LEFT (NORTHWEST) SIDE IN THE WESTERLY ANGLE OF THE INTERSECTION WITH EVANS AVENUE. TO REACH THE STATION FROM THE AZIMUTH MARK, GO NORTHEASTERLY ON WHITTIER STREET FOR 1/4 MILES TO THE STATION SITE ON THE LEFT (NORTHWEST) IN THE NORTHERLY ANGLE OF THE INTERSECTION WITH COTE BRILLIANTE AVENUE AS DESCRIBED. DATE OF REPORT 06-06-1995

Control Text

  • The horizontal coordinates were established by GPS observations and adjusted by the National Geodetic Survey in February 2000.
  • 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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