US Bridges

Centennial Blvd. over Patterson Slough

Good

Lane County, Oregon · Edge Alton Baker Park · Structure no. 039C09150200031

Built
1967
58 years old
Condition
Good
inspected May 2023
Type
Slab
Prestressed Concrete
Length
84 ft
3 main spans
Daily traffic
22,930
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

Centennial Blvd. over Patterson Slough is a prestressed concrete slab carrying Centennial Blvd. over Patterson Slough in Lane County, Oregon. It was built in 1967, so it is 58 years old, older than the Oregon average of 49.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 22,930 vehicles a day, roughly 10% of them trucks, projected to reach 38,173 by 2025. The structure is 84 ft (25.6 m) long and 68 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesCentennial Blvd.
CrossesPatterson Slough
LocationEdge Alton Baker Park
RouteCity Street U1140
StateOregon
Coordinates44.05968, -123.07589
Functional classUrban Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55.7 US tons
Inventory rating42.9 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans3
Design loadHS 20
Structure length84 ft (25.6 m)
Longest span28 ft (8.5 m)
Deck width68 ft (20.8 m)
Roadway width56 ft (17.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,930 (2020)
Projected traffic38,173 by 2025
Trucks10%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Centennial Blvd. over Patterson Slough built?

It was built in 1967, making it 58 years old in 2025.

What condition is Centennial Blvd. over Patterson Slough in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in May 2023.

How much traffic does Centennial Blvd. over Patterson Slough carry?

About 22,930 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Centennial Blvd. over Patterson Slough?

The structure is 84 ft (25.6 m) long with a longest span of 28 ft (8.5 m) and a deck 68 ft wide.

Who owns Centennial Blvd. over Patterson Slough?

It is owned by the City or Municipal Highway Agency.