US Bridges

Beacon-Holgate over I-5

Fair

King County, Washington · 6.5 N JCT SR 900 · Structure no. 0007686B0000000

Built
1966
59 years old
Condition
Fair
inspected August 2024
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
771 ft
9 main spans
Daily traffic
10,600
2012 count
Owner
State
State Highway Agency

About this bridge

Beacon-Holgate over I-5 is a concrete continuous box beam or girders - multiple carrying Beacon-Holgate over I-5 in King County, Washington. It was built in 1966, so it is 59 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.

It carries about 10,600 vehicles a day, roughly 2% of them trucks, projected to reach 16,197 by 2036. The structure is 771 ft (235 m) long and 37 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesBeacon-Holgate
CrossesI-5
Location6.5 N JCT SR 900
RouteCity Street 0
CountyKing County
StateWashington
Coordinates47.58611, -122.32222
Functional classUrban 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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating54.2 US tons
Inventory rating41.8 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans9 (+5 approach)
Design loadHS 20
Structure length771 ft (235 m)
Longest span104 ft (31.7 m)
Deck width37 ft (11.3 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,600 (2012)
Projected traffic16,197 by 2036
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway and railroad
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$11 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Beacon-Holgate over I-5 built?

It was built in 1966, making it 59 years old in 2025.

What condition is Beacon-Holgate over I-5 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 August 2024.

How much traffic does Beacon-Holgate over I-5 carry?

About 10,600 vehicles per day (2012 count), of which roughly 2% are trucks.

How long is Beacon-Holgate over I-5?

The structure is 771 ft (235 m) long with a longest span of 104 ft (31.7 m) and a deck 37 ft wide.

Who owns Beacon-Holgate over I-5?

It is owned by the State Highway Agency.