US Bridges

Lower Diamond Road over Wallowa River

Fair

Wallowa County, Oregon · 0.4 MI S of HWY 82 · Structure no. 08088 788 00037

Built
1956
69 years old
Condition
Fair
inspected September 2024
Type
Tee Beam
Concrete Continuous
Length
129 ft
3 main spans
Daily traffic
203
2020 count
Owner
County
County Highway Agency

About this bridge

Lower Diamond Road over Wallowa River is a concrete continuous tee beam carrying Lower Diamond Road over Wallowa River in Wallowa County, Oregon. It was built in 1956, so it is 69 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 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 203 vehicles a day, roughly 20% of them trucks, projected to reach 218 by 2025. The structure is 129 ft (39.3 m) long and 31 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesLower Diamond Road
CrossesWallowa River
Location0.4 MI S of HWY 82
RouteCounty Highway 0
CountyWallowa County
StateOregon
Coordinates45.59457, -117.57967
Functional classRural Major Collector

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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating45.7 US tons
Inventory rating35.4 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length129 ft (39.3 m)
Longest span48 ft (14.6 m)
Deck width31 ft (9.4 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic203 (2020)
Projected traffic218 by 2025
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Lower Diamond Road over Wallowa River built?

It was built in 1956, making it 69 years old in 2025.

What condition is Lower Diamond Road over Wallowa River 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 September 2024.

How much traffic does Lower Diamond Road over Wallowa River carry?

About 203 vehicles per day (2020 count), of which roughly 20% are trucks.

How long is Lower Diamond Road over Wallowa River?

The structure is 129 ft (39.3 m) long with a longest span of 48 ft (14.6 m) and a deck 31 ft wide.

Who owns Lower Diamond Road over Wallowa River?

It is owned by the County Highway Agency.