Skip to Content

Details for Benchmark: HT3417

N 37° 51.988 W 122° 33.146 (NAD 83)

Altitude: 1033

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

Location:
In MARIN county, CA View Original Datasheet
Designation:
COYOTE RIDGE 2 RESET
Marker Type:
NGS Benchmark
Setting:
setting not listed - see description
Stability:

Reference Points

Must Read!

Benchmarks may be on private property or in dangerous locations. Obey local laws. By using the services on Geocaching.com you agree to this disclaimer.

Backlogging all the benchmarks I have previously found. Sorry for the inaccurate log dates!

Reference mark #2 and benchmark are in great shape.

Fantastic views!

[Photos:]
photoT610 (3).jpg
photoT610 (5).jpg
photoT610 (6).jpg

Great hike with amazing views in all directions

[Photos:]
photoSatellite map of hike area with GPS track log

Found the reference mark and the horizontal mark. Coyote Ridge is a trail in the Marin Headlands, accessible by foot, bike or horse. It's an awesome place to ride! And the views of Marin, San Francisco, and the ocean are incredible.

[last edit: 6/29/2002 11:55:08 PM PST]

[Photos:]
photoHorizontal Control Mark
photoControl Reference
photoview 1
photovuew 2

Documented History (by the NGS)

01/01/1972 by NGS (MONUMENTED)
01/01/1932 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1932 STATION IS ON SOUTHERN EXTREMITY OF HIGHEST RIDGE W OF ELK VALLEY. TO REACH FROM FERRY LANDING AT SAUSALITO, GO 2.8 MILES ON ROUTE 101, TAKE RIGHT FORK AT LARGE SIGN MILL VALLEY ROAD JUST BEFORE ARRIVING AT BRIDGE APPROACH AND FOLLOW ROAD 0.8 MILE, TURN LEFT ONTO TAMALPAIS ROAD AND GO 2.4 MILES, TURN LEFT OFF TAMALPAIN ROAD AND GO 0.4 MILE TO SUMMIT OF RIDGE AND W END OF GROVE OF TREES ON LEFT OF ROAD, AND FOLLOW FENCE LINE UP RIDGE TO S ABOUT 1.0 MILE TO STATION SITE ON HIGHEST AND SOUTHERNMOST HILL. MARKED BY STANDARD STATION DISK IN CONCRETE, AS DESCRIBED IN NOTE 1A. REFERENCE MARK NO. 1 IS STANDARD REFERENCE DISK IN BEDROCK AS DESCRIBED IN NOTE 12B, 4.456 METERS (14.62 FEET) FROM STATION IN AZIMUTH 260 DEG 22 MIN. REFERENCE MARK NO. 2 IS CROSS ON GALVANIZED PIPE, 3.930 METERS (12.89 FEET) FROM STATION IN AZIMUTH 212 DEG 53 MIN.
01/01/1935 by CGS (MONUMENTED)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1935 (FHH) THIS STATION WAS NOT VISITED BUT THERE IS A WOODEN THEODOLITE TRIPOD OVER THE STATION AND THIS WAS FOUND TO AGREE WITH PLANETABLE CUTS TAKEN FROM TRIANGULATION STATION LITTLE LAGOON 1916 AND SEVERAL TRAVERSE POSITIONS.
01/01/1944 by CGS (MONUMENTED)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1944 (EHP) RECOVERED AS DESCRIBED. TO REACH STATION FROM SAN FRANCISCO, GO N ON U.S. HIGHWAY 101 TO JUNCTION WITH STATE HIGHWAY 1, JUST S OF THE BRIDGE OVER RICHARDSON BAY. FOLLOW HIGHWAY 1 FOR 1.0 MILE, TURN LEFT AND, STILL ON HIGHWAY 1, PROCEED 2.8 MILES TO JUNCTION WITH STINSON BEACH ROAD. TAKE STINSON BEACH ROAD FOR 0.4 MILE TO THE W END OF GROVE OF TREES ON LEFT OF ROAD. ON FOOT FOLLOW THE ROAD THROUGH THE TREES AND ALONG THE E SIDE OF THE RIDGE ABOUT 1-1/2 MILES TO STATION ON HIGHEST AND MOST S HILL.
01/01/1952 by CGS (MONUMENTED)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1952 (RAM) THE STATION MARK AND REFERENCE MARK 2 WERE RECOVERED AS DESCRIBED IN GOOD CONDITION. THE DISK FOR REFERENCE MARK 1 WAS FOUND LYING ON THE GROUND IN THE VICINITY OF THE BEDROCK, WHERE THE REFERENCE MARK WAS ORIGINALLY LOCATED. THE SURFACE OF THE BEDROCK HAS BEEN BROKEN.
01/01/1952 by CGS (MONUMENTED)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1952 (WHB) THE STATION WAS FOUND AS DESCRIBED. ALL MARKS IN GOOD CONDITION. THE DESCRIPTION IS GOOD. THE PROPERTY THAT THE STATION IS ON NOW BELONGS TO MR. GEORGE WHEELWRIGHT AND IS CALLED THE GREEN GULCH RANCH. THE RANCH BUILDINGS ARE THE FIRST BUILDINGS DOWN GRADE TOWARD THE OCEAN FROM THE GROVE OF TREES AND LOCKED GATE IN THE PASS. PERMISSION TO ENTER AND THE KEY TO THE GATE SHOULD BE SECURED FROM MR. WHEELWRIGHT.
01/01/1955 by CGS (MONUMENTED)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1955 (CAS) STANDARD STATION DISK AND REFERENCE MARK 1 WERE NOT RECOVERED. STATION MARK HAD BEEN REMOVED FROM CONCRETE AND WAS FOUND LYING NEARBY. REFERENCE MARK 2 IS STILL IN PLACE.
01/01/1958 by USGS (MONUMENTED)
RECOVERY NOTE BY US GEOLOGICAL SURVEY 1958 STATION MARKER HAS BEEN REMOVED. CONCRETE POST FOUND. DISTANCE AND AZIMUTH WAS CHECKED FROM REFERENCE MARK 2 AND FOUND TO BE CORRECT. REFERENCE MARK 2 WAS CONTROLLED AND AN INSTRUMENT STAND WAS BUILT OVER MARKER.
01/01/1959 by CGS (MONUMENTED)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1959 (JCM) AS MENTIONED IN THE 1952 DESCRIPTION REFERENCE MARK NUMBER 1 IS MISSING. REFERENCE MARK NUMBER 2, A CROSS ON TOP OF A PIPE CAP THAT IS STAMPED COYOTE RIDGE 2 NO 2 1895, WAS RECOVERED IN GOOD CONDITION. THE TOP OF THE CONCRETE POST OF THE SURFACE-STATION MARK WAS FOUND BROKEN OFF AND THE STATION DISK WAS GONE. NO UNDERGROUND-STATION MARK WAS MENTIONED AS BEING SET IN 1916 AND NONE WAS FOUND BY DIGGING BELOW THE REMNANT OF THE STATION POST. STATION LOST.
01/01/1972 by NGS (MONUMENTED)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1972 (LFS) REFERENCE MARK 2 WAS RECOVERED IN GOOD CONDITION. THE STATION MARK WAS REESTABLISHED USING THE DISTANCE TO REFERENCE MARK 2 AND THE DIRECTIONS TO REFERENCE MARK 2 AND TRIANGULATION STATIONS RING 1932, RICHARDSON EAST 1895 AND LITTLE LAGOON 1916. REFERENCE MARK 3 WAS SET AND GREEN GULCH (CDH) WAS ESTABLISHED AS AN AZIMUTH MARK ON THIS DATE. A COMPLETE DESCRIPTION FOLLOWS-- THE STATION IS LOCATED ON THE TOP OF A GRASSY KNOLL ON THE HIGHEST POINT OF COYOTE RIDGE, A NORTH-SOUTH RIDGE BETWEEN TENNESSEE VALLEY ON THE SOUTHEAST AND GREEN GULCH ON THE NORTHWEST AND IS AIRLINE ABOUT 3 MILES SOUTH OF MILL VALLEY, 2-1/2 MILES WEST OF MARIN CITY AND 1-1/2 MILES EAST-NORTHEAST OF MUIR BEACH. TO REACH THE STATION FROM THE JUNCTION OF U.S. HIGHWAY 101 AND STATE HIGHWAY 1 ABOUT 4 MILES NORTH OF THE NORTH END OF THE GOLDEN GATE BRIDGE GO WESTERLY ON STATE HIGHWAY 1 FOR 5.5 MILES TO A SIDE ROAD ON THE LEFT AT A SIGN GREEN GULCH RANCH. TURN SHARP LEFT AND GO EASTERLY 0.35 MILE TO A SIDE ROAD AND TWO GATES ON THE LEFT. (FOR PERMISSION TO ENTER CONTINUE STRAIGHT AHEAD 0.1 MILE TO THE RANCH OFFICE.) TURN LEFT, PASS THROUGH THE GATES AND GO EASTERLY 0.65 MILE TO A FORK. TAKE THE RIGHT AND CONTINUE EASTERLY 0.55 MILE TO A FORK AT THE TOP OF THE RIDGE. TURN LEFT AND GO NORTH ALONG THE RIDGE 0.3 MILE TO THE HIGHEST POINT AND THE STATION SITE. THE UNDERGROUND STATION MARK SET ON THIS DATE IS A NGS HORIZONTAL CONTROL DISK STAMPED COYOTE RIDGE 2 1916 1972 SET IN THE TOP OF A BLOCK OF CONCRETE 3.1 FEET BELOW THE SURFACE OF THE GROUND. THE SURFACE STATION MARK SET ON THIS DATE IS A NGS HORIZONTAL CONTROL DISK STAMPED COYOTE RIDGE 2 1916 1972 SET IN THE TOP OF A 12-INCH CONCRETE CYLINDER PROJECTING 0.1 FOOT ABOVE THE GROUND AND IS 14.8 FEET WEST OF AND ABOUT 2 FEET LOWER THAN THE TOP OF A ROCK THAT IS THE HIGHEST POINT OF THE KNOLL, 13.5 FEET NORTHWEST OF A METAL WITNESS POST SET IN A FENCE LINE AND 13.1 FEET NORTHWEST OF THE FENCE LINE. REFERENCE MARK 2 IS A GALVANIZED IRON PIPE CAP WITH A PUNCH MARK IN ITS CENTER, STAMPED COYOTE RIDGE 2 NO 2 1895, ATTACHED TO THE TOP OF A 1-INCH IRON PIPE PROJECTING 0.2 FOOT ABOVE THE GROUND AND IS 9.4 FEET NORTHWEST OF THE FENCE LINE, 19.0 FEET NORTH OF THE METAL WITNESS POST AND ABOUT THE SAME ELEVATION AS THE STATION MARK. REFERENCE MARK 3 IS A NGS REFERENCE MARK DISK STAMPED COYOTE RIDGE 2 1916 NO 3 1972 SET IN THE TOP OF A 12-INCH CONCRETE CYLINDER FLUSH WITH THE GROUND AND IS 4.8 FEET SOUTHWEST OF THE METAL WITNESS POST, 0.5 FOOT NORTHWEST OF THE FENCE LINE AND ABOUT THE SAME ELEVATION AS THE STATION MARK. THE AZIMUTH MARK ESTABLISHED ON THIS DATE IS A CALIFORNIA DIVISION OF HIGHWAYS STATION MARK DISK STAMPED GREEN GULCH 1972 SET IN THE TOP OF A 12-INCH CONCRETE CYLINDER PROJECTING 0.1 FOOT ABOVE THE GROUND AND IS ON TOP OF A GRASSY KNOLL ON THE RIDGE RUNNING NORTH FROM THE STATION SITE. IT IS 80 YARDS EAST OF A GATE IN A SADDLE AND 18.7 FEET SOUTH-SOUTHWEST OF THE WEST BRACE POST OF A FENCE LINE. TO REACH THE AZIMUTH MARK FROM THE STATION GO SOUTH 0.3 MILE TO A FORK. TURN RIGHT AND GO NORTH-NORTHWEST 0.3 MILE TO A FORK AT A SMALL METAL WATER TANK. TAKE THE RIGHT FORK AND GO NORTH ALONG THE WEST SIDE OF THE RIDGE 0.3 MILE TO THE TOP OF A KNOLL AND THE MARK. AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN--1-1/2 MILES ENE OF MUIR BEACH
01/01/1972 by NGS (MONUMENTED)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1972 (RM) THIS STATION WAS RESET IN 1972 BY L.F. SMITH AND THE DESCRIPTION WRITTEN AT THAT TIME IS COMPLETE AND ADEQUATE. AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN--1-1/2 MILES EAST NORTHEAST OF MUIR BEACH

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in March 1994. The horizontal coordinates are valid at the epoch date displayed above. The epoch date for horizontal control is a decimal equivalence of Year/Month/Day.
  • 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.

Advertising with Us

Return to the Top of the Page