US Bridges

Dug Bar Road over Imnaha River

Fair

Wallowa County, Oregon · MP 13.49 RD 4260 · Structure no. 21699 000 01349

Built
1954
71 years old, rebuilt 1981
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
126 ft
1 main span
Daily traffic
103
2020 count
Owner
County
County Highway Agency

About this bridge

Dug Bar Road over Imnaha River is a wood or timber stringer/multi-beam or girder carrying Dug Bar Road over Imnaha River in Wallowa County, Oregon. It was built in 1954 and reconstructed in 1981, 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 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 103 vehicles a day, projected to reach 119 by 2025. The structure is 126 ft (38.4 m) long and 16 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesDug Bar Road
CrossesImnaha River
LocationMP 13.49 RD 4260
RouteCounty Highway 0
CountyWallowa County
StateOregon
Coordinates45.76327, -116.74823
Functional classRural Local

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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating34.3 US tons
Inventory rating26.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans1 (+2 approach)
Design loadHS 20
Structure length126 ft (38.4 m)
Longest span79 ft (24.1 m)
Deck width16 ft (4.9 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic103 (2020)
Projected traffic119 by 2025
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$646,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Dug Bar Road over Imnaha River built?

It was built in 1954, making it 71 years old in 2025. It was reconstructed in 1981.

What condition is Dug Bar Road over Imnaha 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 Dug Bar Road over Imnaha River carry?

About 103 vehicles per day (2020 count).

How long is Dug Bar Road over Imnaha River?

The structure is 126 ft (38.4 m) long with a longest span of 79 ft (24.1 m) and a deck 16 ft wide.

Who owns Dug Bar Road over Imnaha River?

It is owned by the County Highway Agency.