Metadata: Benchmarks

Benchmarks

Category Survey
Feature Dataset Name STAND-ALONE
Item Name BENCHMARK_PDX
Database Type SDE
Originator City of Portland
Bureau Bureau of Transportation
Publication Date
Abstract Benchmarks are survey markers that provide a point of particular elevation used as a reference for determining elevations of other points in a survey. They are used by surveyors, engineers, planners, and contractors for establishing elevations for planning, designing, and/or construction of various projects.The City of Portland is responsible for establishing and maintaining a network of benchmarks throughout the city, each having a known elevation expressed in feet in the City of Portland’s own datum (established in 1896). Most of the City of Portland’s Benchmarks are brass disks about 2 ½" in diameter, and all are marked "City of Portland Bench Mark No. nnnn " and usually set in the curbs of streets. Occasionally you’ll see larger disks of 3 ¾" diameter which are "Class A" monuments, and some benchmarks are set in retaining walls, bridge wing walls, culvert headwalls, concrete steps, or wherever the most stable and accessible placement was determined to be for a specific location. You might also see benchmarks similar to those of the City of Portland’s but with another governmental agency’s or private firm’s name stamped on it. Occasionally the City of Portland Benchmark Book will refer to these monuments and provide elevations, but more often you’ll have to contact the appropriate institution for more information.  The benchmark numbers the City assigned to outside agency monuments are for indexing purposes only; PDOT does not stamp a City of Portland benchmark number on other agencies' monuments.
Purpose For mapping and analysis related to the maintenance of survey benchmarks.
Supplemental Information https://www.portlandoregon.gov/transportation/35705
Last Dataset Update 10/24/2016 15:39
Last Source Update 06/22/2017 05:38
Maintenance/Update Frequency As needed
Extent Clackamas County, Multnomah County, and Washington County, Oregon
Data Type Vector
Shape Type Point
Feature Count 4723
Horizontal Position Accuracy
Horizontal Position Accuracy Link Taxlots
Progress Complete
North Bounding Coordinate 731143.053526714
South Bounding Coordinate 640272.161922097
East Bounding Coordinate 7778704.97981787
West Bounding Coordinate 7603755.97024694
Theme Keyword(s) transportation,survey, benchmarks, elevation
Theme Keyword Thesaurus None
Place Keyword(s) Portland, Multnomah County, Washington County, Clackamas County, Oregon
Place Keyword Thesaurus None
Access Constraints None
Use Constraints These data are distributed uner the terms of the City of Portland Data Distribution Policy. To review the Data Distribution Agreement, please visithttp://Portland Data Distribution Policy.
Source Dataset Type File Geodatabase
Output Geodatabase ASSETS_PDOT
Distribution Grid: State plane coordinate system 1983(91).
Units: International feet
Datum: North American Datum of 1983/1991 (HPGN)
Liability: The information in this file was derived from digital databases on the City of Portland GIS. Care was taken in the creation of this file. The City cannot accept any responsibility for errors, omissions, or positional accuracy. There are no warranties, expressed or implied.
Format: Shapefile or File Geodatabase Feature Class - Data will be provided via City of Portland FTP Site.
Online Resource: http://CivicApps.org
Online Instructions: City of Portland Public/Open Data is distributed via the CivicApps Site  http://CivicApps.org. Data not available on the CivicApps site can be requested by contacting the City of Portland CGIS Group - maps@portlandoregon.gov
Transfer Size: varies
SPCS Zone Identifier: 5076
Contact(s)
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Kirk McEwen
503 823-7179
kirk.mcewen@portlandoregon.gov
1120 SW 5th Ave, Ste 800
Portland, OR 97204

City of Portland - PBOT
503-823-5185
503-823-7576
PBOTCommunications@portlandoregon.gov
File(s)
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Images
53238.png 126.06Kb X
Lineage
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Attribute Tables & Domains

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benchmark_pdx
Table Description
Table Jurisdiction
Column Sort Column Name Column Alias Column Type Column Size Domain Value(s) Column Description
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1 BMNum BMNum Integer 4
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1 BMStatus BMStatus String 10
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1 BMElevation BMElevation Numeric 8
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1 BMDescription BMDescription String 150
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1 District District String 3
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1 Street1 Street1 String 50
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1 Street2 Street2 String 50
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1 AVAddress AVAddress String 50
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1 AVStatus AVStatus String 1
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1 AVScore AVScore Integer 2
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1 AVSide AVSide String 1
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1 QS1A QS1A Integer 4
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1 QS1B QS1B String 10
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1 QS2 QS2 String 4
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1 QS3 QS3 Integer 4
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1 QS4 QS4 Integer 4
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1 DateInventoried DateInventoried Date 8
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1 Northing Northing Numeric 8
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1 Easting Easting Numeric 8
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1 DateLastChangedOn DateLastChangedOn Date 8
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