City Code Chapter
17.96.005 Preservation of Record Monuments.
- Any person or public agency removing, disturbing or destroying any survey monument of record in the office of the County surveyor or County clerk must 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 must be paid by the person or public agency causing the removal, disturbance or destruction.
17.96.050 Datum Plane Established (City of Portland Vertical Datum).
- All grade elevations in Portland are referred to a fixed datum established in this Section. 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 Portland, 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 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 Portland as established in this Chapter.
17.96.062 City Benchmarks.
- The City Surveyor will 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.
- Any person or public agency removing, disturbing or destroying a City benchmark must 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 Portland submitted to the Council will 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 will in no way affect the validity of grades or any improvements carried out prior to such establishment.