US Bridges

I-84 (hwy 002) over Tooth Rock Tunnel

Good

Multnomah County, Oregon · 2.3 Mr W. Cascade Locks · Structure no. 22570 002 04124

Built
1970
55 years old
Condition
Good
inspected July 2023
Type
Tee Beam
Concrete
Length
71 ft
2 main spans
Daily traffic
13,724
2022 count
Owner
State
State Highway Agency

About this bridge

I-84 (hwy 002) over Tooth Rock Tunnel is a concrete tee beam carrying I-84 (hwy 002) over Tooth Rock Tunnel in Multnomah County, Oregon. It was built in 1970, so it is 55 years old, older than the Oregon average of 49.9 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 13,724 vehicles a day, roughly 20% of them trucks, projected to reach 17,550 by 2042. The structure is 71 ft (21.7 m) long and 22 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-84 (hwy 002)
CrossesTooth Rock Tunnel
Location2.3 Mr W. Cascade Locks
RouteInterstate 84
CountyMultnomah County
StateOregon
Coordinates45.63816, -121.93479
Functional classRural 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.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating45 US tons
Inventory rating34.6 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length71 ft (21.7 m)
Longest span71 ft (21.7 m)
Deck width22 ft (6.6 m)
Roadway width13 ft (4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,724 (2022)
Projected traffic17,550 by 2042
Trucks20%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesOther
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 statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-84 (hwy 002) over Tooth Rock Tunnel built?

It was built in 1970, making it 55 years old in 2025.

What condition is I-84 (hwy 002) over Tooth Rock Tunnel 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 July 2023.

How much traffic does I-84 (hwy 002) over Tooth Rock Tunnel carry?

About 13,724 vehicles per day (2022 count), of which roughly 20% are trucks.

How long is I-84 (hwy 002) over Tooth Rock Tunnel?

The structure is 71 ft (21.7 m) long with a longest span of 71 ft (21.7 m) and a deck 22 ft wide.

Who owns I-84 (hwy 002) over Tooth Rock Tunnel?

It is owned by the State Highway Agency.