US Bridges

Ferguson Road over Old Long Tom Channel

Fair

Lane County, Oregon · 040 MI NW Junction City · Structure no. 39C346350800227

Built
1981
44 years old
Condition
Fair
inspected July 2024
Type
Slab
Concrete Continuous
Length
106 ft
3 main spans
Daily traffic
838
2020 count
Owner
County
County Highway Agency

About this bridge

Ferguson Road over Old Long Tom Channel is a concrete continuous slab carrying Ferguson Road over Old Long Tom Channel in Lane County, Oregon. It was built in 1981, so it is 44 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 838 vehicles a day, roughly 20% of them trucks, projected to reach 983 by 2025. The structure is 106 ft (32.3 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
CrossesOld Long Tom Channel
Location040 MI NW Junction City
RouteCounty Highway C3508
CountyLane County
StateOregon
Coordinates44.25191, -123.26832
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, 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 alignment6: Equal to present minimum criteria
Operating rating48.9 US tons
Inventory rating37.8 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length106 ft (32.3 m)
Longest span42 ft (12.8 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic838 (2020)
Projected traffic983 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 Old Long Tom Channel built?

It was built in 1981, making it 44 years old in 2025.

What condition is Ferguson Road over Old Long Tom Channel 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 Old Long Tom Channel carry?

About 838 vehicles per day (2020 count), of which roughly 20% are trucks.

How long is Ferguson Road over Old Long Tom Channel?

The structure is 106 ft (32.3 m) long with a longest span of 42 ft (12.8 m) and a deck 32 ft wide.

Who owns Ferguson Road over Old Long Tom Channel?

It is owned by the County Highway Agency.