US Bridges

Ferguson Road over Long Tom River

Fair

Lane County, Oregon · 040 MI NW Junction City · Structure no. 39C348350800219

Built
1978
47 years old
Condition
Fair
inspected July 2024
Type
Slab
Prestressed Concrete
Length
134 ft
3 main spans
Daily traffic
832
2020 count
Owner
County
County Highway Agency

About this bridge

Ferguson Road over Long Tom River is a prestressed concrete slab carrying Ferguson Road over Long Tom River in Lane County, Oregon. It was built in 1978, so it is 47 years old, younger 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 832 vehicles a day, roughly 20% of them trucks, projected to reach 972 by 2025. The structure is 134 ft (40.8 m) long and 32 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

Location

Open in Google Maps
CarriesFerguson Road
CrossesLong Tom River
Location040 MI NW Junction City
RouteCounty Highway C3508
CountyLane County
StateOregon
Coordinates44.25172, -123.26687
Functional classRural Minor 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
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 protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionJuly 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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating43.2 US tons
Inventory rating33.6 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans3
Design loadHS 20
Structure length134 ft (40.8 m)
Longest span46 ft (14 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic832 (2020)
Projected traffic972 by 2025
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed2.5 mi (4 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 Ferguson Road over Long Tom River built?

It was built in 1978, making it 47 years old in 2025.

What condition is Ferguson Road over Long Tom 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 July 2024.

How much traffic does Ferguson Road over Long Tom River carry?

About 832 vehicles per day (2020 count), of which roughly 20% are trucks.

How long is Ferguson Road over Long Tom River?

The structure is 134 ft (40.8 m) long with a longest span of 46 ft (14 m) and a deck 32 ft wide.

Who owns Ferguson Road over Long Tom River?

It is owned by the County Highway Agency.