US Bridges

SE 296th Pl over Olsen Creek

Fair

King County, Washington · .02 MI E of 118th Ave SE · Structure no. 089213000000000

Built
2018
7 years old
Condition
Fair
inspected May 2023
Type
Culvert
Prestressed Concrete
Length
55 ft
1 main span
Daily traffic
200
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

SE 296th Pl over Olsen Creek is a prestressed concrete culvert carrying SE 296th Pl over Olsen Creek in King County, Washington. It was built in 2018, so it is 7 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 200 vehicles a day, roughly 1% of them trucks, projected to reach 300 by 2041. The structure is 55 ft (16.8 m) long and 40 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesSE 296th Pl
CrossesOlsen Creek
Location.02 MI E of 118th Ave SE
RouteCity Street 615
Coordinates47.33656, -122.18292
Functional classUrban 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 protection8 Very GoodNo problems noted.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating106.8 US tons
Inventory rating88.6 US tons

Structure

Structure typeCulvert
MaterialPrestressed Concrete
DeckNot applicable
Main spans1
Design loadHL 93
Structure length55 ft (16.8 m)
Longest span54 ft (16.5 m)
Deck width40 ft (12.2 m)
Roadway width23 ft (7.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic200 (2021)
Projected traffic300 by 2041
Trucks1%
Lanes on structure2
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$1 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SE 296th Pl over Olsen Creek built?

It was built in 2018, making it 7 years old in 2025.

What condition is SE 296th Pl over Olsen 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 May 2023.

How much traffic does SE 296th Pl over Olsen Creek carry?

About 200 vehicles per day (2021 count), of which roughly 1% are trucks.

How long is SE 296th Pl over Olsen Creek?

The structure is 55 ft (16.8 m) long with a longest span of 54 ft (16.5 m) and a deck 40 ft wide.

Who owns SE 296th Pl over Olsen Creek?

It is owned by the City or Municipal Highway Agency.