Page 57 - TransportationPlanUsetsGuide

Table 3.7: Average 2011 PCI vs. Target PCI by Functional Classification
Functional Classification 2011 Average PCI Target PCI
Urban Area
Arterial 78 80
Collector 80 75
Neighborhood Route (URMD) 84 75
Local (URMD) 85 75
Local (non-URMD) 74 65
Rural Area
Arterial 76 80
Collector 81 75
Local 77 65
System Average 81

Bridge Conditions
Bridges and, to a less notice-
able degree, culverts are
important elements of Wash-
ington County’s transportation
system. These facilities provide
essential system connectivity,
especially in rural areas where
alternate routes are limited.
Washington County manages
188 bridges, 150 of these
structures are longer than 20
feet, which makes them part of
the National Bridge Inventory
(NBI). NRI bridges are inspect-
ed every two years through the
ODOT, and results are reported
to the Federal Highway Admin-
istration. The remaining 38 Rood Bridge is the longest bridge in Washington County with multiple spans totaling 684 feet.
bridges are not on the NBI system and are inspected every two years by certified inspectors who are either Washington
County staff or contracted consultants. Although a culvert is similar to a bridge in that it allows water to flow beneath a
road surface, many culverts are replaced as part of the regular maintenance program or in conjunction with roadway
improvement projects, so they are discussed here.

In addition to deterioration caused by age or the environment, load carrying trucks can do substantial damage to
bridges. To protect the integrity of these facilities as well as public safety, Washington County can designate bridges
as “length and width limited” or as “weight limited,” Although the vast majority of bridges in Washington County are
considered to be “Highway Legal” and capable of carrying trucks that have axle weights and spacing that do not exceed
statutory limits, 10 bridges currently are posted as “Weight Limited” because their structural components or features
have been compromised, or the design was determined to be insufficient to carry specified loads or configurations. Two
bridges in Washington County are designated as Length or Width Limited because of geometric features that restrict
certain size vehicles from traversing the structure without damaging the bridge or conflicting with other traffic move-
ments. Additional information on Washington County bridges can be found in Chapter 2 of the TSP Existing Conditions
and Future Needs Report.

PART 3: TRANSPORTATION MODAL ELEMENTS 45
Effective November 27, 2015 • Updated December, 15 2016