US Bridges

SR 512 over I-5

Fair

Pierce County, Washington · 12.7 N Thurston CO · Structure no. 0005655A0000000

Built
1958
67 years old
Condition
Fair
inspected November 2023
Type
Slab
Concrete Continuous
Length
211 ft
4 main spans
Daily traffic
37,302
2023 count
Owner
State
State Highway Agency

About this bridge

SR 512 over I-5 is a concrete continuous slab carrying SR 512 over I-5 in Pierce County, Washington. It was built in 1958, so it is 67 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 5 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 37,302 vehicles a day, roughly 8% of them trucks, projected to reach 56,628 by 2039. The structure is 211 ft (64.3 m) long and 84 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesSR 512
CrossesI-5
Location12.7 N Thurston CO
RouteState Highway 512
CountyPierce County
StateWashington
Coordinates47.16333, -122.48028
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 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 rating57 US tons
Inventory rating34 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length211 ft (64.3 m)
Longest span59 ft (18 m)
Deck width84 ft (25.6 m)
Roadway width78 ft (23.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic37,302 (2023)
Projected traffic56,628 by 2039
Trucks8%
Lanes on structure6
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes

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$8 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR 512 over I-5 built?

It was built in 1958, making it 67 years old in 2025.

What condition is SR 512 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 November 2023.

How much traffic does SR 512 over I-5 carry?

About 37,302 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is SR 512 over I-5?

The structure is 211 ft (64.3 m) long with a longest span of 59 ft (18 m) and a deck 84 ft wide.

Who owns SR 512 over I-5?

It is owned by the State Highway Agency.