US Bridges

Onion Camp Road over Illinois River

Fair

Josephine County, Oregon · 4MI W & 3MI S 0F 97538 · Structure no. 061104000001074

Built
1954
71 years old
Condition
Fair
inspected September 2024
Type
Truss - Thru
Steel
Length
274 ft
1 main span
Daily traffic
41
1993 count
Owner
Federal
U.S. Forest Service

About this bridge

Onion Camp Road over Illinois River is a steel truss - thru carrying Onion Camp Road over Illinois River in Josephine 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 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 41 vehicles a day, projected to reach 61 by 2045. The structure is 274 ft (83.5 m) long and 16 ft wide. If it were closed, the detour would be 620.7 mi (999 km).

Location

Open in Google Maps
CarriesOnion Camp Road
CrossesIllinois River
Location4MI W & 3MI S 0F 97538
RouteFederal Lands Road 42010
CountyJosephine County
StateOregon
Coordinates42.24556, -123.69556
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
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 protection8 Very GoodNo problems noted.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating36 US tons
Inventory rating26 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+5 approach)
Design loadH 20
Structure length274 ft (83.5 m)
Longest span137 ft (41.8 m)
Deck width16 ft (5 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deck15 ft (4.6 m)

Traffic and service

Average daily traffic41 (1993)
Projected traffic61 by 2045
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed620.7 mi (999 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Onion Camp Road over Illinois River built?

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

What condition is Onion Camp Road over Illinois 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 Onion Camp Road over Illinois River carry?

About 41 vehicles per day (1993 count).

How long is Onion Camp Road over Illinois River?

The structure is 274 ft (83.5 m) long with a longest span of 137 ft (41.8 m) and a deck 16 ft wide.

Who owns Onion Camp Road over Illinois River?

It is owned by the U.S. Forest Service.