National Geodetic Survey, Retrieval Date = SEPTEMBER 3, 2020 SU0990 *********************************************************************** SU0990 DESIGNATION - MOUNT HEADLEY SU0990 PID - SU0990 SU0990 STATE/COUNTY- MT/SANDERS SU0990 COUNTRY - US SU0990 USGS QUAD - MOUNT HEADLEY (2017) SU0990 SU0990 *CURRENT SURVEY CONTROL SU0990 ______________________________________________________________________ SU0990* NAD 83(1992) POSITION- 47 44 23.59393(N) 115 15 49.39187(W) ADJUSTED SU0990* NAVD 88 ORTHO HEIGHT - 2264.6 (meters) 7430. (feet) VERTCON SU0990 ______________________________________________________________________ SU0990 GEOID HEIGHT - -15.629 (meters) GEOID18 SU0990 LAPLACE CORR - 8.95 (seconds) DEFLEC18 SU0990 HORZ ORDER - FIRST SU0990 SU0990.The horizontal coordinates were established by classical geodetic methods SU0990.and adjusted by the National Geodetic Survey in July 1992. SU0990. SU0990.The NAVD 88 height was computed by applying the VERTCON shift value to SU0990.the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.) SU0990 SU0990.Significant digits in the geoid height do not necessarily reflect accuracy. SU0990.GEOID18 height accuracy estimate available here. SU0990 SU0990.Click photographs - Photos may exist for this station. SU0990 SU0990.The Laplace correction was computed from DEFLEC18 derived deflections. SU0990 SU0990. The following values were computed from the NAD 83(1992) position. SU0990 SU0990; North East Units Scale Factor Converg. SU0990;SPC MT - 403,678.136 168,340.212 MT 0.99947327 -4 12 58.3 SU0990;SPC MT - 1,324,403.33 552,297.28 iFT 0.99947327 -4 12 58.3 SU0990;UTM 11 - 5,288,850.315 630,166.525 MT 0.99980821 +1 17 06.7 SU0990 SU0990! - Elev Factor x Scale Factor = Combined Factor SU0990!SPC MT - 0.99964763 x 0.99947327 = 0.99912108 SU0990!UTM 11 - 0.99964763 x 0.99980821 = 0.99945590 SU0990 SU0990: Primary Azimuth Mark Grid Az SU0990:SPC MT - MOUNT HEADLEY AZ MK 111 51 51.1 SU0990:UTM 11 - MOUNT HEADLEY AZ MK 106 21 46.1 SU0990 SU0990_U.S. NATIONAL GRID SPATIAL ADDRESS: 11TPN3016688850(NAD 83) SU0990 SU0990|---------------------------------------------------------------------| SU0990| PID Reference Object Distance Geod. Az | SU0990| dddmmss.s | SU0990| CH8006 MOUNT HEADLEY AZ MK 1073852.8 | SU0990| SU0987 PRISCILLA PEAK LOOKOUT HOUSE APPROX. 9.7 KM 1263422.4 | SU0990| CH8008 MOUNT HEADLEY RM 2 10.054 METERS 14604 | SU0990| SU0991 7424 VA 12.872 METERS 19838 | SU0990| SU0992 MOUNT HEADLEY LOOKOUT HOUSE 7.222 METERS 21012 | SU0990| CH8007 MOUNT HEADLEY RM 1 9.116 METERS 25724 | SU0990|---------------------------------------------------------------------| SU0990 SU0990 SUPERSEDED SURVEY CONTROL SU0990 SU0990 NAD 83(1986)- 47 44 23.60051(N) 115 15 49.38678(W) AD( ) 1 SU0990 NAD 27 - 47 44 23.82991(N) 115 15 45.83243(W) AD( ) 1 SU0990 NGVD 29 (03/27/92) 2263.3 (m) 7426. (f) VERT ANG SU0990 SU0990.Superseded values are not recommended for survey control. SU0990 SU0990.NGS no longer adjusts projects to the NAD 27 or NGVD 29 datums. SU0990.See file dsdata.pdf to determine how the superseded data were derived. SU0990 SU0990_MARKER: DS = TRIANGULATION STATION DISK SU0990_SETTING: 66 = SET IN ROCK OUTCROP SU0990_STAMPING: SOUTH HEADLEY 1940 SU0990_MARK LOGO: CGS SU0990_STABILITY: A = MOST RELIABLE AND EXPECTED TO HOLD SU0990+STABILITY: POSITION/ELEVATION WELL SU0990 SU0990 HISTORY - Date Condition Report By SU0990 HISTORY - 1940 MONUMENTED CGS SU0990 HISTORY - 1964 GOOD USGS SU0990 HISTORY - 1964 GOOD USGS SU0990 SU0990 STATION DESCRIPTION SU0990 SU0990'DESCRIBED BY COAST AND GEODETIC SURVEY 1940 (ANS) SU0990'STATION IS ON TOP OF MOUNT HEADLEY WHICH IS THE HIGHEST IN THE SU0990'IMMEDIATE VICINITY. A U.S.F.S. LOOKOUT HOUSE STANDS ON THE SU0990'HIGHEST POINT OF THE MOUNTAIN WHICH IS ABOUT 11 MILES NE OF SU0990'THOMPSON FALLS AND ABOUT 8 MILES E OF CLARK FORK RIVER. THERE IS SU0990'A U.S.G.S. BENCH MARK 15 FEET S OF THE LOOKOUT HOUSE AND A SU0990'A U.S.G.S. REFERENCE MARK 24 FEET E OF THE LOOKOUT HOUSE. SU0990'THE U.S.G.S. REFERENCE MARK IS REFERENCE MARK NO. 2 FOR THE SU0990'STATION. SU0990' SU0990'STATION AND REFERENCE MARK NO. 1 ARE STANDARD BRONZE DISKS SU0990'WEDGED IN DRILL HOLES IN OUTCROPPING BEDROCK. SU0990' SU0990'STATION MARK IS 15 FEET N OF THE NE CORNER OF THE LOOKOUT HOUSE, SU0990'23.5 FEET NE OF THE CENTER OF THE LOOKOUT HOUSE, FLUSH WITH SU0990'THE GROUND, STAMPED MOUNT HEADLEY 1940. SU0990' SU0990'REFERENCE MARK NO. 1 IS 14 FEET NW OF THE NW CORNER OF THE SU0990'LOOKOUT HOUSE, FLUSH WITH THE GROUND, 1 FOOT BELOW THE STATION, SU0990'STAMPED MOUNT HEADLEY NO. 1, 1940. SU0990' SU0990'REFERENCE MARK NO. 2 IS A STANDARD U.S.G.S. REFERENCE MARK SET SU0990'IN BEDROCK, FLUSH WITH THE GROUND, 24 FEET E OF THE SE CORNER SU0990'OF THE LOOKOUT HOUSE, 2 FEET BELOW THE STATION, STAMPED VA 7424. SU0990'THE ARROW POINTS TOWARDS THE U.S.G.S. BENCH MARK. SU0990' SU0990'THE AZIMUTH MARK IS ABOUT 0.3 MILE ESE ON THE FIRST LOW HILL SU0990'FROM THE STATION. IT IS A STANDARD BRONZE DISK SET IN THE TOP SU0990'OF A LARGE WHITE FLAT ROCK WHICH CAN BE EASILY SEEN FROM SU0990'THE STATION. THE MARK PROJECTS ABOUT 1 FOOT, STAMPED MOUNT SU0990'HEADLEY 1940. SU0990' SU0990'THE U.S.G.S. BENCH MARK IS SET IN BEDROCK, 15 FEET S OF THE SU0990'SW CORNER OF THE LOOKOUT HOUSE, 1 FOOT ABOVE THE STATION, FLUSH SU0990'WITH THE GROUND AND IS STAMPED VA 7424. SU0990' SU0990'REACHED FROM THE POST OFFICE IN THOMPSON FALLS BY GOING S SU0990'AND E FOR 5.0 MILES ON STATE HIGHWAY 3 TO A GRAVEL ROAD LEADING SU0990'LEFT (E). TURN LEFT AND FOLLOW THIS ROAD WHICH LEADS THROUGH SU0990'THE THOMPSON FALLS CIVILIAN CONSERVATION CORPS CAMP FOR 6.1 SU0990'MILES TO FORK LOCALLY KNOWN AS WEST FORK. THE RIGHT FORK PASSES SU0990'OVER A CONCRETE BRIDGE AND THE LEFT FORK CONTINUES STRAIGHT SU0990'AHEAD. CONTINUE STRAIGHT AHEAD (E) FOR 5.0 MILES ON WINDING ROAD SU0990'TO TRAIL SIGNS ON RIGHT. CONTINUE 0.1 MILE TO END OF TRUCK SU0990'TRAVEL AT TRAIL LEADING RIGHT FROM ROAD. THE STATION IS SU0990'REACHED FROM HERE BY FOLLOWING THE FOREST SERVICE SIGNS ALONG SU0990'A WELL TRAVELED TRAIL, A TOTAL DISTANCE OF ABOUT 7 MILES. THE SU0990'TRIP REQUIRES ABOUT 3 HOURS BY HORSE OR IT IS ABOUT 5-1/2 SU0990'HOURS BACK PACK. SU0990' SU0990'HEIGHT OF LIGHT ABOVE STATION MARK - 1-1/2 METERS. SU0990 SU0990 STATION RECOVERY (1964) SU0990 SU0990'RECOVERY NOTE BY US GEOLOGICAL SURVEY 1964 SU0990'STATION MARK - - STANDARD USC AND GS DISK, STAMPED--- MT. SU0990'HEADLEY 1940 ---. SU0990 SU0990 STATION RECOVERY (1964) SU0990 SU0990'RECOVERY NOTE BY US GEOLOGICAL SURVEY 1964 SU0990'STATION MARK - - STANDARD USC AND GS DISK, STAMPED--- MT. SU0990'HEADLEY 1940 ---.