US Bridges

SR 505 over I-5

Fair

Lewis County, Washington · JCT I-5 · Structure no. 0004485A0000000

Built
1954
71 years old
Condition
Fair
inspected November 2023
Type
Tee Beam
Concrete Continuous
Length
207 ft
4 main spans
Daily traffic
4,499
2023 count
Owner
State
State Highway Agency

About this bridge

SR 505 over I-5 is a concrete continuous tee beam carrying SR 505 over I-5 in Lewis County, Washington. It was built in 1954, so it is 71 years old, older than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 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 4,499 vehicles a day, roughly 9% of them trucks, projected to reach 5,483 by 2039. The structure is 207 ft (63.2 m) long and 34 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

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CarriesSR 505
CrossesI-5
LocationJCT I-5
RouteState Highway 505
CountyLewis County
StateWashington
Coordinates46.47575, -122.88356
Functional classRural Major 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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
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
Approach roadway alignment8: Equal to present desirable criteria
Operating rating26.5 US tons
Inventory rating20.4 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length207 ft (63.2 m)
Longest span57 ft (17.4 m)
Deck width34 ft (10.4 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,499 (2023)
Projected traffic5,483 by 2039
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$3.9 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR 505 over I-5 built?

It was built in 1954, making it 71 years old in 2025.

What condition is SR 505 over I-5 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 November 2023.

How much traffic does SR 505 over I-5 carry?

About 4,499 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is SR 505 over I-5?

The structure is 207 ft (63.2 m) long with a longest span of 57 ft (17.4 m) and a deck 34 ft wide.

Who owns SR 505 over I-5?

It is owned by the State Highway Agency.