US Bridges

NW 8th ST over Ribary Creek

Good

King County, Washington · 0.2 MI W of SR-202 · Structure no. 087566000000000

Built
2006
19 years old
Condition
Good
inspected June 2023
Type
Tee Beam
Concrete
Length
89 ft
1 main span
Daily traffic
700
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

NW 8th ST over Ribary Creek is a concrete tee beam carrying NW 8th ST over Ribary Creek in King County, Washington. It was built in 2006, so it is 19 years old, younger than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 700 vehicles a day, roughly 1% of them trucks, projected to reach 1,000 by 2043. The structure is 89 ft (27.1 m) long and 28 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesNW 8th ST
CrossesRibary Creek
Location0.2 MI W of SR-202
RouteCity Street 875
Coordinates47.49967, -121.79311
Functional classUrban Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55.3 US tons
Inventory rating35.7 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckOther
Main spans1
Design loadHL 93
Structure length89 ft (27.1 m)
Longest span86 ft (26.2 m)
Deck width28 ft (8.6 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic700 (2023)
Projected traffic1,000 by 2043
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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$3.6 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was NW 8th ST over Ribary Creek built?

It was built in 2006, making it 19 years old in 2025.

What condition is NW 8th ST over Ribary Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2023.

How much traffic does NW 8th ST over Ribary Creek carry?

About 700 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is NW 8th ST over Ribary Creek?

The structure is 89 ft (27.1 m) long with a longest span of 86 ft (26.2 m) and a deck 28 ft wide.

Who owns NW 8th ST over Ribary Creek?

It is owned by the City or Municipal Highway Agency.