US Bridges

SR 4 over Half Br W of Bunker Hill

Fair

Cowlitz County, Washington · 4.0 E Wahkiakum CO · Structure no. 0001442A0000000

Built
1930
95 years old
Condition
Fair
inspected September 2023
Type
Slab
Concrete Continuous
Length
188 ft
15 main spans
Daily traffic
4,787
2023 count
Owner
State
State Highway Agency

About this bridge

SR 4 over Half Br W of Bunker Hill is a concrete continuous slab carrying SR 4 over Half Br W of Bunker Hill in Cowlitz County, Washington. It was built in 1930, so it is 95 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 4,787 vehicles a day, roughly 9% of them trucks, projected to reach 6,340 by 2039. The structure is 188 ft (57.3 m) long and 17 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesSR 4
CrossesHalf Br W of Bunker Hill
Location4.0 E Wahkiakum CO
RouteState Highway 4
CountyCowlitz County
StateWashington
Coordinates46.18947, -123.13631
Functional classRural Principal Arterial - Other

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment6: Equal to present minimum criteria
Operating rating45 US tons
Inventory rating27 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans15
Design loadUnknown
Structure length188 ft (57.3 m)
Longest span12 ft (3.7 m)
Deck width17 ft (5.2 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,787 (2023)
Projected traffic6,340 by 2039
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesOther
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemYes

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$2.3 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR 4 over Half Br W of Bunker Hill built?

It was built in 1930, making it 95 years old in 2025.

What condition is SR 4 over Half Br W of Bunker Hill 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 September 2023.

How much traffic does SR 4 over Half Br W of Bunker Hill carry?

About 4,787 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is SR 4 over Half Br W of Bunker Hill?

The structure is 188 ft (57.3 m) long with a longest span of 12 ft (3.7 m) and a deck 17 ft wide.

Who owns SR 4 over Half Br W of Bunker Hill?

It is owned by the State Highway Agency.