Washington State County Road Mileage by Function, Surface, and Truck Route

Washington State's County Road Administration Board (CRAB) certifies this annual aggregated snapshot of county road mileage. The dataset includes lane and centerline miles aggregated by year, county, function classification, surface type, and truck route status. Counties are required to submit updated road logs by April 1st each year, with data reflecting the inventory as of December 31st of the preceding calendar year.

Use Cases

• Analyzing trends in paved vs. unpaved road networks using Is_Paved and Calendar_Year columns.
• Comparing transportation infrastructure capacity across counties using Total_Lane_Miles, Total_Centerline_Miles, and County_Name.
• Assessing freight network coverage by filtering Truck_Route_Description and Function_Class_Description columns.
• Evaluating road surface material distribution over time with Thru_Lane_Surface and Calendar_Year columns.

Strengths

• Data is certified by the Washington State County Road Administration Board (CRAB), providing an official record.
• Includes 13 distinct columns covering administrative, categorical, and quantitative road attributes.
• Annual submission is mandated by state regulation (WAC 136-60), suggesting consistent collection.

Limitations

• Row count is unknown, which may limit suitability assessment for large-scale modeling.
• Description metadata is limited; actual data quality requires manual inspection after download.

Provenance

Source

Washington State County Road Administration Board (CRAB) via data.wa.gov

Collection Method

Aggregated from annual road log submissions required from each Washington county.

Time Range

Annual snapshots; specific year range is not provided in the input.

Freshness

Last updated 2025-08-05 20:18:18; freshness should be verified.

Geography

Washington State, United States, aggregated by county.