US Bridges

14th Ave over I-5

Good

Thurston County, Washington · 1.2 N JCT US 101 · Structure no. 0012835A0000000

Built
1986
39 years old
Condition
Good
inspected November 2023
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete Continuous
Length
170 ft
2 main spans
Daily traffic
8,842
2019 count
Owner
State
State Highway Agency

About this bridge

14th Ave over I-5 is a prestressed concrete continuous box beam or girders - single or spread carrying 14th Ave over I-5 in Thurston County, Washington. It was built in 1986, so it is 39 years old, younger 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 8,842 vehicles a day, roughly 2% of them trucks, projected to reach 12,803 by 2039. The structure is 170 ft (51.8 m) long and 43 ft wide. If it were closed, the detour would be 70.2 mi (113 km).

Location

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Carries14th Ave
CrossesI-5
Location1.2 N JCT US 101
RouteCity Street 5
CountyThurston County
StateWashington
Coordinates47.03364, -122.89117
Functional classUrban Minor Arterial

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 inspectionNovember 2023
Inspection intervalevery 48 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 rating99 US tons
Inventory rating87 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length170 ft (51.8 m)
Longest span99 ft (30.2 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,842 (2019)
Projected traffic12,803 by 2039
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed70.2 mi (113 km)
TollOn a toll 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$3.4 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was 14th Ave over I-5 built?

It was built in 1986, making it 39 years old in 2025.

What condition is 14th Ave over I-5 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 November 2023.

How much traffic does 14th Ave over I-5 carry?

About 8,842 vehicles per day (2019 count), of which roughly 2% are trucks.

How long is 14th Ave over I-5?

The structure is 170 ft (51.8 m) long with a longest span of 99 ft (30.2 m) and a deck 43 ft wide.

Who owns 14th Ave over I-5?

It is owned by the State Highway Agency.