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Details for Benchmark: TN0837

N 48° 26.984 W 114° 41.178 (NAD 83)

Altitude: 6018

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

Location:
In FLATHEAD county, MT View Original Datasheet
Designation:
JOHNSON
Marker Type:
NGS Benchmark
Setting:
setting not listed - see description
Stability:

Reference Points

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Documented History (by the NGS)

1/1/1959 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1959 (OSR) STATION IS LOCATED ABOUT 16 MILES WEST AND 3 MILES NORTH OF WHITEFISH, 5-1/2 MILES WEST-NORTHWEST OF THE NORTHWEST END OF TALLY LAKE, 5 MILES NORTH-NORTHEAST OF THE STAR MEADOWS RANGER STATION, IN THE EAST CENTRAL PORTION OF SECTION 17, T 31 N, R 24 W, ON JOHNSON PEAK IN THE FLATHEAD NATIONAL FOREST AND AT THE SITE OF THE JOHNSON PK. LOOKOUT TOWER. TO REACH FROM THE FIRST NATIONAL BANK IN WHITEFISH, GO WEST AND NORTHWEST ON U.S. HIGHWAY 93 FOR 11.2 MILES TO A SIDE ROAD LEFT AT SIGN ON RIGHT TALLY LAKE 9 MILES. TURN LEFT AND FOLLOW GRAVELED ROAD SOUTHERLY FOR 1.6 MILES TO A SIDE ROAD RIGHT. TURN RIGHT AND FOLLOW MAIN GRAVELED ROAD WESTERLY AND SOUTHERLY FOR 4.6 MILES TO A FORK. TAKE THE LEFT FORK AND CONTINUE SOUTH AND SOUTHWESTERLY FOR 2.3 MILES TO A FORK IMMEDIATELY BEYOND A WOODEN BRIDGE AT SIGN LOGAN CREEK CAMP GROUNDS. TAKE THE RIGHT FORK FOR 0.05 MILE TO A T-INTERSECTION AT SIGN STAR MEADOWS 10. TURN RIGHT AND FOLLOW GRAVELED ROAD WESTERLY FOR 1.2 MILES TO A SIDE ROAD RIGHT AT SIGN JOHNSON MTN LOOKOUT 8. TURN RIGHT AND FOLLOW GRADED WOODS ROAD NORTH AND WESTERLY FOR 1.65 MILES TO A FORK. TAKE LEFT FORK AND CONTINUE FOR 0.6 MILE TO A SIDE ROAD RIGHT. TURN RIGHT AND FOLLOW GRADED ROAD NORTHWEST FOR 0.25 MILE TO A FORK AT SIGN ON RIGHT JOHNSON LOOKOUT 3.5 MILES. TAKE THE RIGHT FORK AND CONTINUE NORTHWESTERLY FOR 0.55 MILE TO THE END OF TRUCK TRAVEL AT THE END OF THE ROAD AND SIGN TRAIL NO. 176, JOHNSON LOOKOUT. PACK NORTHERLY, WEST AND SOUTHWEST ON GOOD BLAZED FOREST SERVICE TRAIL FOR ABOUT 3 HOURS TO THE TOP OF THE MOUNTAIN AT A LOOKOUT TOWER AND CABIN AND STATION AS DESCRIBED. THERE IS DRINKING WATER ALONG THE TRAIL ABOUT 1 MILE FROM THE END OF TRUCK TRAVEL AND ALSO ABOUT 1 MILE BEFORE REACHING THE STATION. HORSES CAN BE TAKEN TO THE STATION. STATION MARKS ARE STANDARD DISKS STAMPED JOHNSON 1959. UNDERGROUND MARK IS CEMENTED IN A DRILL HOLE IN BEDROCK ABOUT 18 INCHES BELOW THE GROUND SURFACE. SURFACE MARK IS BRAZED TO THE TOP OF A 3 INCH IRON PIPE PROJECTING 4 INCHES. IT IS 7 FEET NORTH OF THE SOUTH LEG OF THE LOOKOUT TOWER. REFERENCE MARK 1 IS A STANDARD DISK, STAMPED JOHNSON NO 1 1959, CEMENTED IN A DRILL HOLE IN A 3 X 4 FOOT BOULDER PROJECTING ABOUT 4 INCHES. IT IS 88 FEET NORTHWEST OF THE WEST CORNER OF THE LOOKOUT CABIN AND 48.7 FEET EAST OF THE SOUTH LEG OF THE LOOKOUT TOWER. REFERENCE MARK 2 IS A STANDARD DISK, STAMPED JOHNSON NO 2 1959, CEMENTED IN A DRILL HOLE IN A 2 X 4 FOOT BOULDER PROJECTING 1 FOOT ON THE SOUTH SIDE AND FLUSH ON THE NORTH SIDE. IT IS 118 FEET WEST OF THE WEST CORNER OF THE LOOKOUT CABIN AND 85 FEET SOUTH OF THE SOUTH LEG OF THE LOOKOUT TOWER. NO SUITABLE LOCATION COULD BE FOUND FOR AN AZIMUTH MARK. A TRAVERSE CONNECTION WAS MADE TO THE DETERMINED CENTER OF THE LOOKOUT TOWER, THE DISTANCE BEING AS SHOWN ABOVE.
1/1/1960 by CGS (MONUMENTED)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1960 (OSR) STATION WAS RECOVERED AS DESCRIBED AND ALL MARKS WERE FOUND IN GOOD CONDITION.

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in July 1992.
  • 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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