US Bridges

Nelson Mtn Road over Liebre Creek

Fair

Lane County, Oregon · 032 MI SW of Greenleaf · Structure no. 39C388367000267

Built
1984
41 years old
Condition
Fair
inspected August 2023
Type
Slab
Prestressed Concrete
Length
30 ft
1 main span
Daily traffic
274
2020 count
Owner
County
County Highway Agency

About this bridge

Nelson Mtn Road over Liebre Creek is a prestressed concrete slab carrying Nelson Mtn Road over Liebre Creek in Lane County, Oregon. It was built in 1984, so it is 41 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 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 274 vehicles a day, roughly 10% of them trucks, projected to reach 319 by 2025. The structure is 30 ft (9.1 m) long and 28 ft wide. If it were closed, the detour would be 18.6 mi (30 km).

Location

Open in Google Maps
CarriesNelson Mtn Road
CrossesLiebre Creek
Location032 MI SW of Greenleaf
RouteCounty Highway C3670
CountyLane County
StateOregon
Coordinates44.09326, -123.63164
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating87 US tons
Inventory rating46 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length30 ft (9.1 m)
Longest span29 ft (8.8 m)
Deck width28 ft (8.6 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic274 (2020)
Projected traffic319 by 2025
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed18.6 mi (30 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 Nelson Mtn Road over Liebre Creek built?

It was built in 1984, making it 41 years old in 2025.

What condition is Nelson Mtn Road over Liebre 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 August 2023.

How much traffic does Nelson Mtn Road over Liebre Creek carry?

About 274 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Nelson Mtn Road over Liebre Creek?

The structure is 30 ft (9.1 m) long with a longest span of 29 ft (8.8 m) and a deck 28 ft wide.

Who owns Nelson Mtn Road over Liebre Creek?

It is owned by the County Highway Agency.