US Bridges

I-84 (hwy 002) over Bonneville Dam Con

Fair

Multnomah County, Oregon · 3.3 MI W Cascade Locks · Structure no. 06924 002 04027

Built
1951
74 years old
Condition
Fair
inspected June 2023
Type
Frame
Concrete
Length
33 ft
1 main span
Daily traffic
27,448
2022 count
Owner
State
State Highway Agency

About this bridge

I-84 (hwy 002) over Bonneville Dam Con is a concrete frame carrying I-84 (hwy 002) over Bonneville Dam Con in Multnomah County, Oregon. It was built in 1951, so it is 74 years old, older than the Oregon average of 49.9 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 27,448 vehicles a day, roughly 20% of them trucks, projected to reach 35,100 by 2042. The structure is 33 ft (10.1 m) long and 83 ft wide.

Location

Open in Google Maps
CarriesI-84 (hwy 002)
CrossesBonneville Dam Con
Location3.3 MI W Cascade Locks
RouteInterstate 84
CountyMultnomah County
StateOregon
Coordinates45.63224, -121.95396
Functional classRural 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating44.3 US tons
Inventory rating34.3 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length33 ft (10.1 m)
Longest span33 ft (10.1 m)
Deck width83 ft (25.4 m)
Roadway width79 ft (24.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic27,448 (2022)
Projected traffic35,100 by 2042
Trucks20%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed—
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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$169,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-84 (hwy 002) over Bonneville Dam Con built?

It was built in 1951, making it 74 years old in 2025.

What condition is I-84 (hwy 002) over Bonneville Dam Con 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-84 (hwy 002) over Bonneville Dam Con carry?

About 27,448 vehicles per day (2022 count), of which roughly 20% are trucks.

How long is I-84 (hwy 002) over Bonneville Dam Con?

The structure is 33 ft (10.1 m) long with a longest span of 33 ft (10.1 m) and a deck 83 ft wide.

Who owns I-84 (hwy 002) over Bonneville Dam Con?

It is owned by the State Highway Agency.