US Bridges

I-5 over Mcallister CR

Fair

Thurston County, Washington · 2.2 N JCT SR 510 · Structure no. 0008100E0000000

Built
1968
57 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
272 ft
3 main spans
Daily traffic
50,433
2023 count
Owner
State
State Highway Agency

About this bridge

I-5 over Mcallister CR is a prestressed concrete stringer/multi-beam or girder carrying I-5 over Mcallister CR 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 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 50,433 vehicles a day, roughly 11% of them trucks, projected to reach 74,353 by 2039. The structure is 272 ft (82.9 m) long and 52 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-5
CrossesMcallister CR
Location2.2 N JCT SR 510
RouteInterstate 5
CountyThurston County
StateWashington
Coordinates47.06791, -122.72033
Functional classUrban Principal Arterial - Interstate

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating16.8 US tons
Inventory rating12.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length272 ft (82.9 m)
Longest span95 ft (29 m)
Deck width52 ft (15.7 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50,433 (2023)
Projected traffic74,353 by 2039
Trucks11%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and waterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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$7 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was I-5 over Mcallister CR built?

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

What condition is I-5 over Mcallister CR 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 June 2023.

How much traffic does I-5 over Mcallister CR carry?

About 50,433 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is I-5 over Mcallister CR?

The structure is 272 ft (82.9 m) long with a longest span of 95 ft (29 m) and a deck 52 ft wide.

Who owns I-5 over Mcallister CR?

It is owned by the State Highway Agency.