US Bridges

113th Ave SW over I-5

Fair

Thurston County, Washington · 2.0 N JCT SR 121 · Structure no. 0008271C0000000

Built
1968
57 years old
Condition
Fair
inspected November 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
204 ft
4 main spans
Daily traffic
1,076
2002 count
Owner
State
State Highway Agency

About this bridge

113th Ave SW over I-5 is a prestressed concrete stringer/multi-beam or girder carrying 113th Ave SW over I-5 in Thurston County, Washington. It was built in 1968, so it is 57 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 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 1,076 vehicles a day, roughly 1% of them trucks, projected to reach 1,954 by 2036. The structure is 204 ft (62.2 m) long and 32 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

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Carries113th Ave SW
CrossesI-5
Location2.0 N JCT SR 121
RouteCounty Highway 0
CountyThurston County
StateWashington
Coordinates46.92361, -122.9465
Functional classRural Major 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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
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 rating54 US tons
Inventory rating28 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 15
Structure length204 ft (62.2 m)
Longest span57 ft (17.4 m)
Deck width32 ft (9.7 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,076 (2002)
Projected traffic1,954 by 2036
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed8.7 mi (14 km)
TollOn a free road
National Highway SystemNo

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$3.1 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was 113th Ave SW over I-5 built?

It was built in 1968, making it 57 years old in 2025.

What condition is 113th Ave SW 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 113th Ave SW over I-5 carry?

About 1,076 vehicles per day (2002 count), of which roughly 1% are trucks.

How long is 113th Ave SW over I-5?

The structure is 204 ft (62.2 m) long with a longest span of 57 ft (17.4 m) and a deck 32 ft wide.

Who owns 113th Ave SW over I-5?

It is owned by the State Highway Agency.