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City of Portland

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Chapter 17.96 Surveys, Elevations and Monuments


- Note

(Amended by Ordinance No. 182760, effective June 5, 2009.)


17.96.005 Preservation of Record Monuments.

(Added by Ordinance No. 182760, effective June 5, 2009.)  Any person or public agency removing, disturbing or destroying any survey monument of record in the office of the County surveyor or County clerk shall cause a registered professional land surveyor to reference and replace the monument as prescribed by the applicable Oregon Revised Statues.  The cost of referencing and replacing the survey monument shall be paid by the person or public agency causing the removal, disturbance or destruction.


17.96.010 Base Line Established.

(Repealed by Ordinance No. 182760, effective June 5, 2009.)


17.96.020 Monuments Established.

(Repealed by Ordinance No. 182760, effective June 5, 2009.)


17.96.030 Base Line for Couch?s Addition Established.

(Repealed by Ordinance No. 182760, effective June 5, 2009.)


17.96.040 Monuments Established in Couch?s Addition.

(Repealed by Ordinance No. 182760, effective June 5, 2009.)


17.96.050 Datum Plane Established (City of Portland Vertical Datum).

(Amended by Ordinance No. 182760, effective June 5, 2009.)  All grade elevations in the City shall be referred to a fixed datum established herein.  The datum plane for grades was originally established 56.743 feet below the initial bench mark set by the City in the southerly quadrant of the top step of the Soldiers’ Monument located in Lownsdale Square in the City, said bench mark being marked “CITY OF PORTLAND, INITIAL CLASS A BENCH MARK NO. 00, $50 FINE FOR DISTURBING.”  A datum plane above described is hereby established as the official datum of the City.  The United States geological survey bench mark set in the granite base of the north pillar of the porte cochere at the SW 5th Avenue central entrance to the City Hall in Portland has an elevation 78.835 feet above the datum plane of the City as herein established.


17.96.060 Grade Elevations To Be Recorded.

(Repealed by Ordinance No. 182760, effective June 5, 2009.)


17.96.062 City Benchmarks.

(Added by Ordinance No. 182760, effective June 5, 2009.)  The City Surveyor shall establish and maintain a network of benchmarks throughout the City.  Benchmarks are survey markers that have a specific elevations determined for them and these elevations are referenced to the City of Portland Vertical Datum.  Benchmark information can be found on the Portland Transportation Survey Section website.


17.96.065 Preservation of City Benchmarks.

(Added by Ordinance No. 182760,  effective June 5, 2009.)  Any person or public agency removing, disturbing or destroying a City Benchmark shall contact the Portland Transportation Survey Section as soon as it is apparent that a Benchmark will be or has been removed, disturbed or destroyed.  Survey may set a new Benchmark in the vicinity of the old one and establish an elevation for it.


17.96.070 Grade Elevations To Be Referred to Datum Plane.

All proposed establishment of grades or changes of grades in the City submitted to the Council shall be referred to the datum plane.


17.96.080 Prior Grades Not Affected.

The establishment of a fixed base to which all grade elevations are referred as outlined in this Chapter shall in no way affect the validity of grades or any improvements carried out prior to such establishment.