US Bridges

SR 121 / 93rd Ave over I-5

Fair

Thurston County, Washington · 7.6 E JCT I-5 · Structure no. 0008271D0000000

Built
1968
57 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
204 ft
4 main spans
Daily traffic
10,892
2023 count
Owner
State
State Highway Agency

About this bridge

SR 121 / 93rd Ave over I-5 is a prestressed concrete stringer/multi-beam or girder carrying SR 121 / 93rd Ave 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 10,892 vehicles a day, roughly 13% of them trucks, projected to reach 16,683 by 2039. The structure is 204 ft (62.2 m) long and 36 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

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CarriesSR 121 / 93rd Ave
CrossesI-5
Location7.6 E JCT I-5
RouteState Highway 121
CountyThurston County
StateWashington
Coordinates46.95275, -122.93714
Functional classUrban Minor Arterial

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 inspectionOctober 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 rating32 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length204 ft (62.2 m)
Longest span57 ft (17.4 m)
Deck width36 ft (11 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,892 (2023)
Projected traffic16,683 by 2039
Trucks13%
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$4.1 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR 121 / 93rd Ave over I-5 built?

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

What condition is SR 121 / 93rd Ave 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 October 2023.

How much traffic does SR 121 / 93rd Ave over I-5 carry?

About 10,892 vehicles per day (2023 count), of which roughly 13% are trucks.

How long is SR 121 / 93rd Ave 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 36 ft wide.

Who owns SR 121 / 93rd Ave over I-5?

It is owned by the State Highway Agency.