US Bridges

SE 400th ST over Newaukum Creek

Fair

King County, Washington · 1 MI E 212th Ave SE · Structure no. 080196000000000

Built
1927
98 years old
Condition
Fair
inspected July 2023
Type
Culvert
Concrete
Length
24 ft
1 main span
Daily traffic
3,694
2020 count
Owner
County
County Highway Agency

About this bridge

SE 400th ST over Newaukum Creek is a concrete culvert carrying SE 400th ST over Newaukum Creek in King County, Washington. It was built in 1927, so it is 98 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 5 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 3,694 vehicles a day, roughly 9% of them trucks, projected to reach 6,670 by 2038. The structure is 24 ft (7.3 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesSE 400th ST
CrossesNewaukum Creek
Location1 MI E 212th Ave SE
RouteCounty Highway 93666
CountyKing County
StateWashington
Coordinates47.24275, -122.03925
Functional classRural 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
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating106.8 US tons
Inventory rating106.8 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 20
Structure length24 ft (7.3 m)
Longest span24 ft (7.3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,694 (2020)
Projected traffic6,670 by 2038
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemYes

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 substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.2 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SE 400th ST over Newaukum Creek built?

It was built in 1927, making it 98 years old in 2025.

What condition is SE 400th ST over Newaukum Creek 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 July 2023.

How much traffic does SE 400th ST over Newaukum Creek carry?

About 3,694 vehicles per day (2020 count), of which roughly 9% are trucks.

How long is SE 400th ST over Newaukum Creek?

The structure is 24 ft (7.3 m) long with a longest span of 24 ft (7.3 m).

Who owns SE 400th ST over Newaukum Creek?

It is owned by the County Highway Agency.