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Details for Benchmark: PC1090

N 43° 36.873 W 123° 58.785 (NAD 83)

Altitude: 1822

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

Location:
In DOUGLAS county, OR View Original Datasheet
Designation:
DEAN MTN
Marker Type:
NGS Benchmark
Setting:
setting not listed - see description
Stability:

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Documented History (by the NGS)

1/1/1936 by USFS (MONUMENTED)
DESCRIBED BY US FOREST SERVICE 1936 THIS OCCUPIED STATION IS REFERENCE MARK DISK FOR STATION DEAN MOUNTAIN LOOKOUT HOUSE (U.S.F.S.), DESCRIPTION OF WHICH GIVES TRAVEL DIRECTIONS AND OTHER DATA. STATION DEAN MOUNTAIN (U.S.F.S.) IS MARKED BY U.S.F.S. DISK IN BOULDER. CENTER OF LOOKOUT HOUSE IS 4.642 METERS (15.23 FEET) SOUTHERLY FROM DISK. DISK WAS OCCUPIED AS ECCENTRIC STATION FOR OBSERVATIONS FROM LOOKOUT HOUSE. SEE LIST OF DIRECTIONS, DEAN MTN. LOOKOUT HOUSE. POSITION OF DISK CAN BE COMPUTED. CENTER OF LOOKOUT IS 133 DEG 30 MIN TO LEFT OF SIGHT DISK TO SILTCOOS L.O.
1/1/1942 by CGS (MONUMENTED)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1942 (JCS) STATION IS LOCATED ABOUT 8 MILES, AIR LINE, SE OF REEDSPORT AND 1/4 MILE N OF THE COOS-DOUGLAS COUNTY LINE. IT IS ON THE SUMMIT OF DEANS MOUNTAIN AND ABOUT 2 METERS N OF THE N SIDE OF THE ELIOTT STATE FOREST LOOKOUT HOUSE. STATION IS APPROXIMATELY 2000 FEET IN ELEVATION. STATION MARK IS A BRONZE U.S. FOREST SERVICE DISK SET IN A BURIED BOULDER FLUSH WITH THE SURFACE. MARK IS STAMPED DEAN MTN. 1936. NO UNDERGROUND MARK WAS ESTABLISHED. REFERENCE MARK NO.1 IS A BRONZE DISK SET IN A SQUARE BLOCK OF CONCRETE PROJECTING ABOUT 6 INCHES ABOVE THE SURFACE. IT IS ABOUT 18 INCHES N OF THE N SIDE OF THE GARAGE AT ITS NW CORNER. MARK IS STAMPED DEAN MTN. NO.1 1942. REFERENCE MARK NO.2 IS A BRONZE DISK SET IN A SQUARE BLOCK OF CONCRETE PROJECTING ABOUT 6 INCHES ABOVE THE SURFACE. IT IS ABOUT 9 YARDS W OF THE W SIDE OF THE LOOKOUT HOUSE. MARK IS STAMPED DEAN MTN. NO.2 1942. BOTH REFERENCE MARKS ARE SLIGHTLY LOWER THAN THE STATION MARK. THE AZIMUTH MARK IS A BRONZE DISK SET IN A SQUARE BLOCK OF CONCRETE PROJECTING ABOUT 6 INCHES. IT IS LOCATED AT THE LAST ROAD FORK ENROUTE TO STATION AND IS ABOUT 5 YARDS SOUTHERLY OF THE FOREST SERVICE SIGN READING DEAN MTN. 0.2 MI. MARK IS STAMPED DEAN MTN. 1942. TO REACH FROM REEDSPORT GO EASTERLY ON STATE HIGHWAY 38, UP UMPQUA RIVER, 1.7 MILES. TURN RIGHT AND FOLLOW MAIN-TRAVELED ROAD 3.6 MILES. TAKE LEFT FORK AND CONTINUE 2.4 MILES TO LARGE RANCH HOUSE ON LEFT. OBTAIN KEY TO LOCKED GATE, WHICH IS ABOUT 200 YARDS AHEAD, AT RANCH HOUSE. CONTINUE ABOUT 150 YARDS. TAKE RIGHT FORK, UPGRADE, THROUGH LOCKED GATE, AND FOLLOW THIS ROAD SOUTHEASTERLY 8.3 MILES TO OLD POWDER HOUSE ON RIGHT. KEEP LEFT ON MAIN-TRAVELED ROAD 0.3 MILE. THENCE TAKE LEFT FORK 0.2 MILE TO LOOKOUT HOUSE AND STATION.
1/1/1953 by CGS (MONUMENTED)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1953 (CTH) THE STATION WAS RECOVERED AS DESCRIBED AND ALL MARKS WERE FOUND IN GOOD CONDITION. THE STATION MARK IS TOO CLOSE TO A LOOKOUT HOUSE TO OCCUPY, THEREFORE REFERENCE MARK NO. 3 WAS ESTABLISHED BY THIS PARTY AND OCCUPIED. A DESCRIPTION OF REFERENCE MARK NO. 3 FOLLOWS. REFERENCE MARK NO. 3 IS A STANDARD DISK SET IN THE TOP OF A 4-INCH IRON PIPE THAT PROJECTS 3 INCHES, AND THE DISK IS STAMPED DEAN MTN NO 3 1942. IT IS 11 FEET EAST OF THE NORTHEAST CORNER OF A LOOKOUT TOWER.
1/1/1971 by NGS (MONUMENTED)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1971 (LDF) THE STATION MARK AND REFERENCE MARK 3 WERE RECOVERED IN POOR CONDITION. BOTH MARKS APPEAR TO BE TILTED. REFERENCE MARKS 1 AND 2 WERE RECOVERED IN GOOD CONDITION. IT WAS NOTED AT THE TIME OF RECOVERY THAT BOTH MEASUREMENTS TO REFERENCE MARKS 1 AND 3 WERE 0.005 METER SHORTER THAN THE 1953 MEASUREMENTS. ALSO A DIFFERENCE IN THE ANGLE BETWEEN REFERENCE MARKS 1 AND 3 WAS IN ERROR BY 23 MINUTES AND THE ANGLE BETWEEN REFERENCE MARKS 1 AND 2 WAS IN ERROR BY 13 MINUTES. THE ANGLES AND MEASUREMENTS WERE CONFIRMED BY A DIFFERENT OBSERVER ON A DIFFERENT DAY. A SEARCH WAS MADE FOR THE AZIMUTH MARK BUT IT COULD NOT BE FOUND. THERE HAS BEEN GRADING IN THE AREA AND IT IS PRESUMED THAT THE MARK IS DESTROYED. A NEW AZIMUTH MARK WAS ESTABLISHED. THE LOOKOUT TOWER HAS BEEN REMOVED. THE STATION IS LOCATED ON THE SUMMIT OF DEAN MOUNTAIN APPROXIMATELY 8 MILES SOUTHEAST OF REEDSPORT, 1/4 MILE NORTH OF COOS-DOUGLAS COUNTY LINE, IN THE SW 1/4 SECTION 35, T 22 S, R 10 W, ON THE PROPERTY MAINTAINED BY THE STATE FOREST SERVICE. PERMISSION TO ENTER THE PROPERTY AND THE KEY FOR THE LOCKED CABLE CAN BE OBTAINED FROM THE DISTRICT FOREST OFFICE IN REEDSPORT. TO REACH THE STATION FROM THE POST OFFICE IN REEDSPORT, GO EAST ON STATE HIGHWAY 38 FOR 5.4 MILES TO A SIDE ROAD RIGHT, JUST AFTER CROSSING DEAN CREEK. TURN RIGHT AND GO SOUTH ON DEAN CREEK ROAD FOR 2.6 MILES TO A FORK AND SIGN DEAN MTN. FOREST RD. TAKE THE RIGHT FORK, DEAN MTN. FOREST RD., AND GO IN A WESTERLY DIRECTION ON THE GRAVEL ROAD 1.25 MILES TO A SIDE ROAD RIGHT. CONTINUE IN A WESTERLY AND SOUTHERLY DIRECTION FOR 0.75 MILE TO A SIDE ROAD RIGHT AND SIGN MILLER RIDGE RD. CONTINUE IN A SOUTH AND SOUTHEASTERLY DIRECTION FOR 2.25 MILES TO A FORK, TAKE LEFT FORK AND CONTINUE IN A SOUTHEASTERLY DIRECTION ON THE MAIN GRAVEL ROAD FOR 3.75 MILES TO A T-ROAD AND SIGN DEAN MTN. L.O. TURN RIGHT AND GO SOUTH FOR 0.65 MILE TO A 3-WAY FORK, (AT THIS POINT TO REACH THE AZIMUTH MARK, TAKE THE EXTREME LEFT FORK FOR 0.1 MILE TO A DIM FORK, TAKE LEFT FORK TO THE TOP OF A SMALL FLAT KNOLL AND THE AZIMUTH MARK AS DESCRIBED). TAKE EXTREME RIGHT FORK AT THE 3-WAY FORK, GO UPHILL APPROXIMATELY 300 FEET TO A LOCKED CABLE ACROSS THE ROAD, CONTINUE FOR 0.15 MILE TO THE SUMMIT AND THE STATION AS DESCRIBED. THE STATION IS A DEPARTMENT OF AGRICULTURE STATION MARK DISK, STAMPED DEAN MTN 1936, CEMENTED IN A DRILL HOLE IN A BURIED BOULDER THAT IS 2 INCHES BELOW THE SURFACE OF THE GROUND. IT IS 79.5 FEET EAST-SOUTHEAST OF A LONE TREE AND 35.6 FEET NORTHWEST OF THE NORTH CORNER OF A GARAGE. REFERENCE MARK 1 IS A STANDARD DISK, STAMPED DEAN MTN NO 1 1942, SET IN A 12-INCH SQUARE CONCRETE MONUMENT THAT IS FLUSH WITH THE SURFACE OF THE GROUND. IT IS 3.0 FEET EAST OF THE NORTH CORNER OF THE GARAGE AND APPROXIMATELY 3 FEET LOWER IN ELEVATION THAN THE STATION. REFERENCE MARK 2 IS A STANDARD DISK, STAMPED DEAN MTN NO 2 1942, SET IN THE TOP OF A 12-INCH SQUARE CONCRETE MONUMENT THAT PROJECTS 4 INCHES ABOVE THE SURFACE OF THE GROUND. IT IS 65.5 FEET EAST OF THE NORTH CORNER OF THE GARAGE, 41.5 FEET EAST-SOUTHEAST OF THE LONE TREE AND APPROXIMATELY 1 FOOT LOWER IN ELEVATION THAN THE STATION. REFERENCE MARK 3 IS A STANDARD DISK, STAMPED DEAN MTN NO 3 1942, WELDED IN THE TOP OF A IRON PIPE THAT PROJECTS 4 INCHES ABOVE THE SURFACE OF THE GROUND. IT IS 94.0 FEET SOUTHEAST OF THE LONE TREE, 24.0 FEET NORTH-NORTHEAST OF THE NORTH CORNER OF THE GARAGE AND APPROXIMATELY 2 FEET LOWER IN ELEVATION THAN THE STATION. THE AZIMUTH MARK IS A STANDARD DISK, STAMPED DEAN MTN USFS 1942 1971, CEMENTED IN A DRILL HOLE IN A LARGE FLAT OUTCROPPING BED ROCK THAT IS FLUSH WITH THE SURFACE OF THE GROUND. IT IS 98.0 FEET SOUTH-SOUTHWEST OF A METAL WITNESS POST AND 52 FEET NORTH OF THE SOUTH EDGE OF THE KNOLL. HEIGHT OF LIGHT ABOVE STATION MARK 4 FEET. AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN 8 MILES SOUTHEAST OF REEDSPORT.

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in October 1991.
  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The geoid height was determined by GEOID99.

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