US Bridges

Brynion ST over I-5

Fair

Cowlitz County, Washington · 0.6 N JCT SR 4 · Structure no. 0010902F0000000

Built
1980
45 years old
Condition
Fair
inspected October 2023
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
280 ft
2 main spans
Daily traffic
3,721
2002 count
Owner
State
State Highway Agency

About this bridge

Brynion ST over I-5 is a concrete continuous box beam or girders - multiple carrying Brynion ST over I-5 in Cowlitz County, Washington. It was built in 1980, so it is 45 years old, younger 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 3,721 vehicles a day, roughly 1% of them trucks, projected to reach 5,998 by 2036. The structure is 280 ft (85.3 m) long and 38 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

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CarriesBrynion ST
CrossesI-5
Location0.6 N JCT SR 4
RouteCity Street 0
CountyCowlitz County
StateWashington
Coordinates46.15225, -122.90161
Functional classUrban Minor Arterial

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 inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.9 US tons
Inventory rating44.6 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length280 ft (85.3 m)
Longest span144 ft (43.9 m)
Deck width38 ft (11.6 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,721 (2002)
Projected traffic5,998 by 2036
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed8.7 mi (14 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$5.6 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Brynion ST over I-5 built?

It was built in 1980, making it 45 years old in 2025.

What condition is Brynion ST 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 October 2023.

How much traffic does Brynion ST over I-5 carry?

About 3,721 vehicles per day (2002 count), of which roughly 1% are trucks.

How long is Brynion ST over I-5?

The structure is 280 ft (85.3 m) long with a longest span of 144 ft (43.9 m) and a deck 38 ft wide.

Who owns Brynion ST over I-5?

It is owned by the State Highway Agency.