US Bridges

Fir Butte Road over Amazon Creek

Fair

Lane County, Oregon · 070 MI NW Eugene · Structure no. 39C431427300068

Built
1972
53 years old
Condition
Fair
inspected July 2024
Type
Slab
Prestressed Concrete
Length
85 ft
3 main spans
Daily traffic
899
2020 count
Owner
County
County Highway Agency

About this bridge

Fir Butte Road over Amazon Creek is a prestressed concrete slab carrying Fir Butte Road over Amazon Creek in Lane County, Oregon. It was built in 1972, so it is 53 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 899 vehicles a day, roughly 10% of them trucks, projected to reach 904 by 2025. The structure is 85 ft (25.9 m) long and 32 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesFir Butte Road
CrossesAmazon Creek
Location070 MI NW Eugene
RouteCounty Highway C4273
CountyLane County
StateOregon
Coordinates44.0802, -123.23463
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
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 rating27.9 US tons
Inventory rating21.4 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans3
Design loadHS 20
Structure length85 ft (25.9 m)
Longest span27 ft (8.2 m)
Deck width32 ft (9.7 m)
Roadway width31 ft (9.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic899 (2020)
Projected traffic904 by 2025
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 Fir Butte Road over Amazon Creek built?

It was built in 1972, making it 53 years old in 2025.

What condition is Fir Butte Road over Amazon Creek 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 Fir Butte Road over Amazon Creek carry?

About 899 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Fir Butte Road over Amazon Creek?

The structure is 85 ft (25.9 m) long with a longest span of 27 ft (8.2 m) and a deck 32 ft wide.

Who owns Fir Butte Road over Amazon Creek?

It is owned by the County Highway Agency.