US Bridges

SE 208th ST over Rock Creek

Good

King County, Washington · 4.2 E Issaq-Hobart · Structure no. 086104000000000

Built
1994
31 years old
Condition
Good
inspected March 2024
Type
Slab
Prestressed Concrete
Length
62 ft
1 main span
Daily traffic
200
2024 count
Owner
County
County Highway Agency

About this bridge

SE 208th ST over Rock Creek is a prestressed concrete slab carrying SE 208th ST over Rock Creek in King County, Washington. It was built in 1994, so it is 31 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 200 vehicles a day, projected to reach 300 by 2040. The structure is 62 ft (18.9 m) long and 20 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesSE 208th ST
CrossesRock Creek
Location4.2 E Issaq-Hobart
RouteCounty Highway 81540
Coordinates47.41472, -121.88792
Functional classRural Local

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50.7 US tons
Inventory rating38.3 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length62 ft (18.9 m)
Longest span60 ft (18.3 m)
Deck width20 ft (6.1 m)
Roadway width17 ft (5.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic200 (2024)
Projected traffic300 by 2040
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedDeck rehabilitation with only incidental widening
Estimated improvement cost$648,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SE 208th ST over Rock Creek built?

It was built in 1994, making it 31 years old in 2025.

What condition is SE 208th ST over Rock 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 March 2024.

How much traffic does SE 208th ST over Rock Creek carry?

About 200 vehicles per day (2024 count).

How long is SE 208th ST over Rock Creek?

The structure is 62 ft (18.9 m) long with a longest span of 60 ft (18.3 m) and a deck 20 ft wide.

Who owns SE 208th ST over Rock Creek?

It is owned by the County Highway Agency.