US Bridges

SR 512 over 15th Ave SW

Good

Pierce County, Washington · 1.1 E JCT SR 161 · Structure no. 0009010B0000000

Built
1973
52 years old
Condition
Good
inspected April 2024
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
217 ft
3 main spans
Daily traffic
42,930
2023 count
Owner
State
State Highway Agency

About this bridge

SR 512 over 15th Ave SW is a concrete continuous box beam or girders - multiple carrying SR 512 over 15th Ave SW in Pierce County, Washington. It was built in 1973, so it is 52 years old, older than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 42,930 vehicles a day, roughly 9% of them trucks, projected to reach 67,291 by 2039. The structure is 217 ft (66.1 m) long and 54 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesSR 512
Crosses15th Ave SW
Location1.1 E JCT SR 161
RouteState Highway 512
Coordinates47.17714, -122.297
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56 US tons
Inventory rating33 US tons

Structure

MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length217 ft (66.1 m)
Longest span80 ft (24.4 m)
Deck width54 ft (16.6 m)
Roadway width52 ft (15.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic42,930 (2023)
Projected traffic67,291 by 2039
Trucks9%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 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$6.1 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR 512 over 15th Ave SW built?

It was built in 1973, making it 52 years old in 2025.

What condition is SR 512 over 15th Ave SW in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2024.

How much traffic does SR 512 over 15th Ave SW carry?

About 42,930 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is SR 512 over 15th Ave SW?

The structure is 217 ft (66.1 m) long with a longest span of 80 ft (24.4 m) and a deck 54 ft wide.

Who owns SR 512 over 15th Ave SW?

It is owned by the State Highway Agency.