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Details for Benchmark: HT2518

N 37° 49.071 W 122° 10.595 (NAD 83)

Altitude: 1622

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

Location:
In CONTRA COSTA county, CA View Original Datasheet
Designation:
REDWOOD
Marker Type:
NGS Benchmark
Setting:
setting not listed - see description
Stability:

Reference Points

Must Read!

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Like valhikes, we were doing Nifty Ninety Peaks today, and spotted this BM. Doing well!

Went up another Nifty Ninety and found a benchmark. Fun peak even without a view. Maybe I was just in the mood to be siting among the young redwoods. Found station at the obvious place and looked from there to find two references. All there. Did not go searching for any azimuth.

Found where described

[Photos:]
photoFor reference
photoReference mark
photoEye level
photoMark

Saw it on the trail

[Photos:]
photoIMG_2551

Found on Redwood Peak while out geocaching.

Out with flowerisland and mask2011 for a nice hike in the redwoods. Happened upon this benchmark. Great location.

While caching in Redwood, we found this benchmark. In perfect condition among the majestic redwood trees. Thanx.

Was out hiking today and while searching for a cache nearby, we stumbled across this random benchmark. In great shape, in a nice concrete block.

Found all three on a hike before going down to Chabot Space and Science Center to look at the supernova

Stumbled onto this benchmark while searching for a nearby cache.

It's always cool to stumble on these when/where you expect it the least.

Stumbled upon this after finding cache close by.

Found this benchmark today while hiking in the park.

Redwood Peak is a beautiful hike that requires no off trail or cross country activity.

Another benchmark!

I found the benchmark, but did not see either of the two reference marks (I did not have the description) or the nearby geocache.

Set in foot high concrete obelisk.

Found while picking up USGS Arrow Points the Way.

Actually found the Geocache near here first, then had to look for the three USGS marks. Rainy day kept it quiet around here.

caching on vacation from MN... found near cache

FOund this while searching for a nearby cache. Cache notes said there were three benchmarks in the area, but I only found this one.

Found in good condition.

Very cool, I'd not seen a BM with reference pointers before.

[Photos:]
photoRef 1 with GPSr
photoRedwood 1 with GPSr
A pretty clear picture of how off my particular GPSr can be... (waypoint coords are according to Terraserver)

Didn't notice it when I was here 2.5 years ago for the Multimedia cache (GCE8BB), but found it today.

Found them while looking for geocache.

[This entry was edited by 4wheeler on Wednesday, August 11, 2004 at 10:19:24 PM.]

[Photos:]
photoReference 2 w/GPS
photoReference 1 w/GPS
photoRedwood 1946
photoRedwood 1946 w/GPS

Found it when looking for the geocache multimedia.

Just off well used trail.

I also stumbled upon this (almost literally) while searching for the nearby Multimedia geocache.

This is our first benchmark we found. Cool. Found it when looking for the geocache multimedia

Found while looking for multimedia

[Photos:]
photoB3
photoB2
photoB1

I found this when I was looking for a Cache, so if you go for multimedia, besure to check out this bench mark!
SAVEFERRIS

There are three benchmarks here. Two are afixed to rocks and one is set into concrete. This is the highest point for some distance and is a very easy to access given its altitude.

[Photos:]
photoBenchmark 3
photoBenchmark 1
photoBenchmark 2

I also stumbled across this one on the back trails of the Redwoods Park.

N 37° 49.077 W 122° 10.595

Never thought I'd make a first find for a local Geodotic Survey Marker. Stumbled on this one hiking the Rewdood peak trail. Near Archery Range/Redwood Bowl Picnic area. Beautiful but often steep trails.
When does graffiti become a petroglygh?

An external antena helped get a good sat lock in heavy redwood tree cover, with accuracy given as 18.6'.

[last edit: 11/7/2002 12:25:03 PM PST]

Documented History (by the NGS)

01/01/1947 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1947 (SPH) THE STATION IS ON TOP OF REDWOOD PEAK, WHICH IS ABOUT ON THE ALAMEDA-CONTRA COSTA COUNTY LINE AND LIES TO THE NORTH SIDE OF SKYLINE BLVD. AND ABOUT 3 MILES EAST OF PIEDMONT. IT IS ON THE HIGHEST POINT OF THE HILL, ABOUT 20 FT. S OF MARKED TRAIL AND IS STAMPED REDWOOD 1946. REFERENCE MARK NO. 1 IS STAMPED REDWOOD NO 1 1946 AND PROJECTS 4 FT. ABOVE THE SURFACE. IT IS SET IN A LARGE BOULDER, WHICH IS ON THE S SIDE OF THE HILL, 10 FT. W OF MARKED TRAIL. REFERENCE MARK NO. 2 IS STAMPED REDWOOD NO 2 1946 AND PROJECTS 6 FT. ABOVE THE SURFACE. IT IS SET IN A LARGE BOULDER AT A JUNCTION IN THE TRAIL ON THE WEST SIDE OF THE HILL. THERE IS NO AZIMUTH MARK FOR THIS STATION AS IT IS SET IN A LARGE GROVE OF REDWOOD TREES AND MUCH CLEARING WOULD BE NECESSARY.
01/01/1963 by CGS (MONUMENTED)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1963 (IRR) THE STATION MARK AND REFERENCE MARKS WERE RECOVERED IN GOOD CONDITION AND THE 1947 DESCRIPTION IS ADEQUATE WITH THE FOLLOWING ADDITIONS AND CORRECTIONS-- THE STATION IS LOCATED IN CONTRA COSTA COUNTY, NOT ALAMEDA COUNTY, AND IS ABOUT 1/10 MILE NORTHEAST OF THE ALAMEDA-CONTRA COSTA COUNTY LINE. TO REACH THE STATION FROM THE INTERSECTION OF SKYLINE BOULEVARD AND JOAQUIN MILLER ROAD IN THE EAST SECTION OF OAKLAND GO NORTHEAST AND NORTH ON SKYLINE BOULEVARD 1.4 MILES TO A SIDE ROAD ON THE RIGHT AT A SIGN REDWOOD BOWMEN. TURN RIGHT AND GO EAST AND NORTH 0.1 MILE TO THE REDWOOD BOWMEN ARCHERY RANGE. PACK EAST 1/10 MILE ACROSS A SADDLE AND UP TO THE HIGHEST POINT AND THE STATION.

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.

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