US Bridges

Portland Avenue over Deschutes River

Fair

Deschutes County, Oregon · 001 MI W Bus US 20 · Structure no. 17B003000000000

Built
1962
63 years old
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
180 ft
3 main spans
Daily traffic
11,211
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

Portland Avenue over Deschutes River is a prestressed concrete stringer/multi-beam or girder carrying Portland Avenue over Deschutes River in Deschutes County, Oregon. It was built in 1962, so it is 63 years old, older than the Oregon average of 49.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 11,211 vehicles a day, roughly 1% of them trucks, projected to reach 11,961 by 2025. The structure is 180 ft (54.9 m) long and 42 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesPortland Avenue
CrossesDeschutes River
Location001 MI W Bus US 20
RouteCity Street 3320
StateOregon
Coordinates44.06416, -121.31094
Functional classUrban Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure8 Very GoodNo problems noted.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating28.5 US tons
Inventory rating22.2 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length180 ft (54.9 m)
Longest span60 ft (18.3 m)
Deck width42 ft (12.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,211 (2020)
Projected traffic11,961 by 2025
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$922,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Portland Avenue over Deschutes River built?

It was built in 1962, making it 63 years old in 2025.

What condition is Portland Avenue over Deschutes River in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in February 2023.

How much traffic does Portland Avenue over Deschutes River carry?

About 11,211 vehicles per day (2020 count), of which roughly 1% are trucks.

How long is Portland Avenue over Deschutes River?

The structure is 180 ft (54.9 m) long with a longest span of 60 ft (18.3 m) and a deck 42 ft wide.

Who owns Portland Avenue over Deschutes River?

It is owned by the City or Municipal Highway Agency.