US Bridges

I-5 over Dillenbaugh Creek

Good

Lewis County, Washington · 3.8 N JCT SR 508 · Structure no. 002000860000000

Built
1965
60 years old
Condition
Good
inspected May 2023
Type
Culvert
Concrete Continuous
Length
22 ft
2 main spans
Daily traffic
30,397
2023 count
Owner
State
State Highway Agency

About this bridge

I-5 over Dillenbaugh Creek is a concrete continuous culvert carrying I-5 over Dillenbaugh Creek in Lewis County, Washington. It was built in 1965, so it is 60 years old, older than the Washington average of 49.8 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 30,397 vehicles a day, roughly 21% of them trucks, projected to reach 39,368 by 2039. The structure is 22 ft (6.7 m) long. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesI-5
CrossesDillenbaugh Creek
Location3.8 N JCT SR 508
RouteInterstate 5
CountyLewis County
StateWashington
Coordinates46.62728, -122.93442
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Good

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

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadUnknown
Structure length22 ft (6.7 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30,397 (2023)
Projected traffic39,368 by 2039
Trucks21%
Lanes on structure6
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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$1.2 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was I-5 over Dillenbaugh Creek built?

It was built in 1965, making it 60 years old in 2025.

What condition is I-5 over Dillenbaugh Creek 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 I-5 over Dillenbaugh Creek carry?

About 30,397 vehicles per day (2023 count), of which roughly 21% are trucks.

How long is I-5 over Dillenbaugh Creek?

The structure is 22 ft (6.7 m) long with a longest span of 10 ft (3 m).

Who owns I-5 over Dillenbaugh Creek?

It is owned by the State Highway Agency.