County Maintained Roads

A red roadster leads a parade of classic cars through downtown Troutdale, with a crowd sitting on the sidewalk with an American flag.
Troutdale Summerfest parade on Historic Columbia River Highway, July 18, 2015. Photo by Jeff Muceus, CC BY-SA 2.0

Multnomah County Road Maintenance is responsible for maintaining 274 miles of roads, as specified in the Master Road List. County roads are divided into sections. The beginning and end of each section have mile points (MP). Please take note of the “From Location/To Location” column of the Master Road List. This column specifies the descriptions of beginning and end mile points of each section. The column at the far right indicates the Pavement Condition Index (PCI) for each section.  PCI is explained in the Pavement Management Program.

Bridge Structures

Multnomah County Road Services also maintains a number of bridges and other structures in east county and Sauvie Island, in partnership with Multnomah County Bridge Services.


West of the Willamette River:

East of the Willamette River:

Mileage Data

The Oregon Department of Transportation's Oregon Mileage Report is the official source for public road mileage information in the state. The report includes state and local roads. The “Summary Report by County” is helpful.


Figure 1 (78.88 KB) shows the history of pavement management and the current PCI for the entire county system. It also shows the resulting PCI for each of the next five years for a proposed budget. Figures 2-6 (146.3 KB) show Road Deterioration Models and the link between road maintenance budgets and pavement quality.

Troutdale Summerfest photo by Jeff Muceus, CC BY-SA 2.0. Image has been cropped.