US Bridges

Macadam Road S. over S 133rd

Fair

King County, Washington · 0.3 S JCT SR599 · Structure no. 086742000000000

Built
1997
28 years old
Condition
Fair
inspected April 2023
Type
Frame
Concrete
Length
64 ft
1 main span
Daily traffic
3,600
2019 count
Owner
City
City or Municipal Highway Agency

About this bridge

Macadam Road S. over S 133rd is a concrete frame carrying Macadam Road S. over S 133rd in King County, Washington. It was built in 1997, so it is 28 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 3,600 vehicles a day, roughly 7% of them trucks, projected to reach 4,000 by 2039. The structure is 64 ft (19.5 m) long and 40 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesMacadam Road S.
CrossesS 133rd
Location0.3 S JCT SR599
RouteCity Street 1037
CountyKing County
StateWashington
Coordinates47.48471, -122.28018
Functional classUrban Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionApril 2023
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 alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating69 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length64 ft (19.5 m)
Longest span62 ft (18.9 m)
Deck width40 ft (12.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,600 (2019)
Projected traffic4,000 by 2039
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$2.7 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Macadam Road S. over S 133rd built?

It was built in 1997, making it 28 years old in 2025.

What condition is Macadam Road S. over S 133rd 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 April 2023.

How much traffic does Macadam Road S. over S 133rd carry?

About 3,600 vehicles per day (2019 count), of which roughly 7% are trucks.

How long is Macadam Road S. over S 133rd?

The structure is 64 ft (19.5 m) long with a longest span of 62 ft (18.9 m) and a deck 40 ft wide.

Who owns Macadam Road S. over S 133rd?

It is owned by the City or Municipal Highway Agency.