US Bridges

E Boston Terrace over Ravine

FairPosted for load

King County, Washington · 1660 E Boston Terrace · Structure no. 085340000000000

Built
1948
77 years old
Condition
Fair
inspected July 2023
Type
Slab
Concrete Continuous
Length
248 ft
16 main spans
Daily traffic
160
2019 count
Owner
City
City or Municipal Highway Agency

About this bridge

E Boston Terrace over Ravine is a concrete continuous slab carrying E Boston Terrace over Ravine in King County, Washington. It was built in 1948, so it is 77 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. Its operating status is: posted for load restriction.

It carries about 160 vehicles a day, roughly 2% of them trucks, projected to reach 230 by 2039. The structure is 248 ft (75.6 m) long and 22 ft wide.

Location

Open in Google Maps
CarriesE Boston Terrace
CrossesRavine
Location1660 E Boston Terrace
RouteCity Street 1140
CountyKing County
StateWashington
Coordinates47.63722, -122.31222
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment6: Equal to present minimum criteria
Operating rating23 US tons
Inventory rating14 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans16
Design loadUnknown
Structure length248 ft (75.6 m)
Longest span16 ft (4.9 m)
Deck width22 ft (6.8 m)
Roadway width16 ft (4.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic160 (2019)
Projected traffic230 by 2039
Trucks2%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesOther
Detour if closed—
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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$2.1 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was E Boston Terrace over Ravine built?

It was built in 1948, making it 77 years old in 2025.

What condition is E Boston Terrace over Ravine 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 E Boston Terrace over Ravine carry?

About 160 vehicles per day (2019 count), of which roughly 2% are trucks.

How long is E Boston Terrace over Ravine?

The structure is 248 ft (75.6 m) long with a longest span of 16 ft (4.9 m) and a deck 22 ft wide.

Who owns E Boston Terrace over Ravine?

It is owned by the City or Municipal Highway Agency.