US Bridges

I-5 over Mcallister CR

Good

Thurston County, Washington · 2.2 N JCT SR 510 · Structure no. 0008100G0000000

Built
1968
57 years old
Condition
Good
inspected June 2023
Type
Slab
Concrete Continuous
Length
216 ft
6 main spans
Daily traffic
2,200
2023 count
Owner
State
State Highway Agency

About this bridge

I-5 over Mcallister CR is a concrete continuous slab 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 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 2,200 vehicles a day, roughly 11% of them trucks, projected to reach 3,062 by 2039. The structure is 216 ft (65.8 m) long and 26 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesI-5
CrossesMcallister CR
Location2.2 N JCT SR 510
RouteInterstate 5
CountyThurston County
StateWashington
Coordinates47.06736, -122.721
Functional classUrban Principal Arterial - Interstate

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.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50 US tons
Inventory rating38.6 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20 + Mod
Structure length216 ft (65.8 m)
Longest span39 ft (11.9 m)
Deck width26 ft (8 m)
Roadway width23 ft (7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,200 (2023)
Projected traffic3,062 by 2039
Trucks11%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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$2.9 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 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 June 2023.

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

About 2,200 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is I-5 over Mcallister CR?

The structure is 216 ft (65.8 m) long with a longest span of 39 ft (11.9 m) and a deck 26 ft wide.

Who owns I-5 over Mcallister CR?

It is owned by the State Highway Agency.