US Bridges

Heckard Road over Slough

Fair

Pacific County, Washington · 3.2 SE JCT 101 & 6 · Structure no. 084476000000000

Built
1916
109 years old
Condition
Fair
inspected June 2024
Type
Culvert
Concrete
Length
40 ft
1 main span
Daily traffic
226
2023 count
Owner
County
County Highway Agency

About this bridge

Heckard Road over Slough is a concrete culvert carrying Heckard Road over Slough in Pacific County, Washington. It was built in 1916, so it is 109 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 226 vehicles a day, roughly 5% of them trucks, projected to reach 800 by 2043. The structure is 40 ft (12.2 m) long and 20 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesHeckard Road
CrossesSlough
Location3.2 SE JCT 101 & 6
RouteCounty Highway 69550
CountyPacific County
StateWashington
Coordinates46.66469, -123.67769
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating27 US tons
Inventory rating20.9 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadUnknown
Structure length40 ft (12.2 m)
Longest span30 ft (9.1 m)
Deck width20 ft (6.1 m)
Roadway width17 ft (5.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic226 (2023)
Projected traffic800 by 2043
Trucks5%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of relocation of road
Estimated improvement cost$1.2 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Heckard Road over Slough built?

It was built in 1916, making it 109 years old in 2025.

What condition is Heckard Road over Slough 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 June 2024.

How much traffic does Heckard Road over Slough carry?

About 226 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Heckard Road over Slough?

The structure is 40 ft (12.2 m) long with a longest span of 30 ft (9.1 m) and a deck 20 ft wide.

Who owns Heckard Road over Slough?

It is owned by the County Highway Agency.