US Bridges

US 101 over Black Lake Blvd

Fair

Thurston County, Washington · 3.9 S JCT SR 8 · Structure no. 0014272C0000000

Built
1995
30 years old
Condition
Fair
inspected November 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
191 ft
1 main span
Daily traffic
24,066
2023 count
Owner
State
State Highway Agency

About this bridge

US 101 over Black Lake Blvd is a prestressed concrete box beam or girders - multiple carrying US 101 over Black Lake Blvd in Thurston County, Washington. It was built in 1995, so it is 30 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 24,066 vehicles a day, roughly 6% of them trucks, projected to reach 35,884 by 2039. The structure is 191 ft (58.2 m) long and 84 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesUS 101
CrossesBlack Lake Blvd
Location3.9 S JCT SR 8
RouteU.S. Route 101
CountyThurston County
StateWashington
Coordinates47.03256, -122.94122
Functional classUrban Principal Arterial - Other Freeway or Expressway

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating99 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length191 ft (58.2 m)
Longest span188 ft (57.3 m)
Deck width84 ft (25.5 m)
Roadway width78 ft (23.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic24,066 (2023)
Projected traffic35,884 by 2039
Trucks6%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$7.4 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was US 101 over Black Lake Blvd built?

It was built in 1995, making it 30 years old in 2025.

What condition is US 101 over Black Lake Blvd 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 November 2023.

How much traffic does US 101 over Black Lake Blvd carry?

About 24,066 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is US 101 over Black Lake Blvd?

The structure is 191 ft (58.2 m) long with a longest span of 188 ft (57.3 m) and a deck 84 ft wide.

Who owns US 101 over Black Lake Blvd?

It is owned by the State Highway Agency.