2013-01-16

Chiseled Cross

This is certainly not a benchmark in the true sense of the word, but it may be, on a certain level, just as important.

Surveyors often set temporary marks in the course of a survey.  They may set a wood hub, or stake if the use is truly temporary, like if it's only going to be used for that day, or even a single set-up of the instrument.  For a mark with a bit more permanence, such as one intended to be used for the duration of a project, a nail and shiner in concrete or pavement, or a cross in concrete may be set.

Chiseled crosses are also used in many areas as tie marks to help identify important cadastral marks, such as property corner monuments and Public Land Survey System (PLSS) monuments (Section Corners).  Crosses such as these can be used to help re-establish the position of a lost or destroyed Section Corner when they are properly mapped and that map filed with the County Surveyor.

This cross caught my eye simply because it had been brightly painted by the crew using it that day.

Chiseled cross on top of a curb.  A surveyor can use this for just about anything, from a triangulation or tie point, as a traverse point, or even to mark a property line or corner.
Chiseled cross on top of a curb.  A surveyor can use this for just about anything, from a triangulation or tie point, as a traverse point, or even to mark a property line or corner.

2013-01-09

Fresno City TBM 2534

I was driving to work this morning and, due to a stuck thermostat which caused my motorcycle to drink fuel MUCH faster than normal, I ran out of gas. While I waited for my wife to bring a gas can, I saw this City of Fresno TBM (Temporary BenchMark) #2534 on the curb near where my bike came to rest.  It's in front of the Fresno Memorial Gardens Cemetery gates.

The mark is described as a chiseled square on the top of the curb, south of Whitesbridge Avenue.  It was found as described.

Number: TBM2534
Type: Chiseled Square
Elev: 264.869
N/S Street: South Cornelia Avenue
E/W Street: West Whitesbridge Avenue (State Route 180)
Description: CHISELED SQUARE ON CURB, WEST SIDE OF CORNELIA, 785' SOUTH OF WHITESBRIDGE, NORTH RETURN OF ENTRANCE

Fresno City TBM 2534 Detail - Chiseled square on top of curb.
Fresno City TBM 2534 Detail - Chiseled square on top of curb and GPSr.