Name: HPMS Base Thickness

Display Field: RouteID

Type: Feature Layer

Geometry Type: esriGeometryPolyline

Description: The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) HPMS base thickness event polyline feature class represents the thickness of the lowest pavement layer, commonly referred to as the base course, beneath the surface layer of the roadway. This information is collected and maintained as part of the HPMS inventory to support structural design, performance modeling, and pavement condition assessment. The base thickness attribute indicates the compacted depth of granular, stabilized, or treated material placed directly on the subgrade to provide load distribution and structural support. Thickness values are typically expressed in inches and derived from design plans, as built documentation, or pavement management system records. This dataset is used by engineers, planners, and researchers for evaluating pavement structure adequacy, forecasting maintenance needs, and analyzing the relationship between pavement design and performance. It is updated annually as part of ITD’s Highway Performance Monitoring System (HPMS) submittal process to the Federal Highway Administration (FHWA) and reflects current data available from pavement inventory systems and design records. These are current "working" records. For the static, published data, please see the records stored at: https://www.fhwa.dot.gov/policyinformation/hpms.cfm

Service Item Id: 05ffc9faab084f28b9553d1e9fad4b69

Copyright Text: This dataset was developed and provided by the Idaho Transportation Department (ITD). Users should credit ITD as the original source when utilizing or referencing this information in maps, reports, or applications.

Default Visibility: true

MaxRecordCount: 2000

Supported Query Formats: JSON, geoJSON, PBF

Min Scale: 0.0

Max Scale: 0.0

Supports Advanced Queries: true

Supports Statistics: true

Has Labels: false

Can Modify Layer: true

Can Scale Symbols: false

Use Standardized Queries: true

Supports Datum Transformation: true

Extent:

XMin: 2254295.3529000003
YMin: 1199867.0130000003
XMax: 2743735.2621
YMax: 1977283.6800999995
Spatial Reference: 102605  (8826)  LatestVCSWkid(0)

Drawing Info:

Renderer:
Simple Renderer:
Symbol:
Style: esriSLSSolid
Color: [0, 169, 230, 255]
Width: 1
Label: N/A
Description: N/A
Transparency: 0
Labeling Info:

Advanced Query Capabilities:

Supports Statistics: true
Supports OrderBy: true
Supports Distinct: true
Supports Pagination: true
Supports TrueCurve: true
Supports Returning Query Extent: true
Supports Query With Distance: true
Supports Sql Expression: true
Supports Query With ResultType: false
Supports Returning Geometry Centroid: false
Supports Binning LOD: false
Supports Query With LOD Spatial Reference: false
Supports Percentile Statistics: true
Supports Having Clause: true
Supports Count Distinct: true
Supports Time Relation: true
Supports Sql Format: false
Supports Query Analytic: true
Supports Query With Current User: true

HasZ: true

HasM: true

Has Attachments: false

HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText

Type ID Field: null

Fields:

• OBJECTID ( type: esriFieldTypeOID, alias: Object ID )
• EventID ( type: esriFieldTypeString, alias: Event ID, length: 38 )
• RouteID ( type: esriFieldTypeString, alias: Route ID, length: 12 )
• FromDate ( type: esriFieldTypeDate, alias: From Date, length: 8 )
• ToDate ( type: esriFieldTypeDate, alias: To Date, length: 8 )
• FromMeasure ( type: esriFieldTypeDouble, alias: From Measure )
• ToMeasure ( type: esriFieldTypeDouble, alias: To Measure )
• EstablishedDate ( type: esriFieldTypeDate, alias: Effective Date, length: 8 )
• SystemModifyDate ( type: esriFieldTypeDate, alias: System Modify Date, length: 8 )
• LocError ( type: esriFieldTypeString, alias: Location Error, length: 100 )
• BaseThickness ( type: esriFieldTypeDouble, alias: Base Thickness )
• GlobalID ( type: esriFieldTypeGlobalID, alias: GlobalID, length: 38 )
• RouteSystemCode ( type: esriFieldTypeString, alias: Route System Code, length: 2 )
• RouteSystemNumber ( type: esriFieldTypeSmallInteger, alias: Route System Number )
• Shape ( type: esriFieldTypeGeometry, alias: Shape )
• Shape.STLength() ( type: esriFieldTypeDouble, alias: Shape.STLength() )

Supported Operations:   Query   Query Attachments   Query Analytic   Generate Renderer   Return Updates

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