US Bridges

I-84 (hwy 002) over The Dalles Dam Acc

Good

Wasco County, Oregon · 030 MI E the Dalles · Structure no. 07771 002 08883

Built
1954
71 years old
Condition
Good
inspected August 2024
Type
Frame
Concrete
Length
33 ft
1 main span
Daily traffic
17,317
2022 count
Owner
State
State Highway Agency

About this bridge

I-84 (hwy 002) over The Dalles Dam Acc is a concrete frame carrying I-84 (hwy 002) over The Dalles Dam Acc in Wasco County, Oregon. It was built in 1954, so it is 71 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 17,317 vehicles a day, roughly 29% of them trucks, projected to reach 19,300 by 2042. The structure is 33 ft (10.1 m) long and 90 ft wide.

CarriesI-84 (hwy 002)
CrossesThe Dalles Dam Acc
Location030 MI E the Dalles
RouteInterstate 84
StateOregon
Coordinates45.6206, -121.11203
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 inspectionAugust 2024
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 alignment8: Equal to present desirable criteria
Operating rating98.9 US tons
Inventory rating76.1 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 width90 ft (27.5 m)
Roadway width86 ft (26.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic17,317 (2022)
Projected traffic19,300 by 2042
Trucks29%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
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 statusHistorical significance not determinable at this time
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 The Dalles Dam Acc built?

It was built in 1954, making it 71 years old in 2025.

What condition is I-84 (hwy 002) over The Dalles Dam Acc 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 August 2024.

How much traffic does I-84 (hwy 002) over The Dalles Dam Acc carry?

About 17,317 vehicles per day (2022 count), of which roughly 29% are trucks.

How long is I-84 (hwy 002) over The Dalles Dam Acc?

The structure is 33 ft (10.1 m) long with a longest span of 33 ft (10.1 m) and a deck 90 ft wide.

Who owns I-84 (hwy 002) over The Dalles Dam Acc?

It is owned by the State Highway Agency.