US Bridges

Nelson Mtn Road over Nelson Creek

Fair

Lane County, Oregon · 030 MI So West Greenleaf · Structure no. 39C387367000250

Built
1979
46 years old
Condition
Fair
inspected August 2023
Type
Slab
Prestressed Concrete
Length
60 ft
2 main spans
Daily traffic
262
2020 count
Owner
County
County Highway Agency

About this bridge

Nelson Mtn Road over Nelson Creek is a prestressed concrete slab carrying Nelson Mtn Road over Nelson Creek in Lane County, Oregon. It was built in 1979, so it is 46 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 262 vehicles a day, roughly 10% of them trucks, projected to reach 307 by 2025. The structure is 60 ft (18.3 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
CrossesNelson Creek
Location030 MI So West Greenleaf
RouteCounty Highway C3670
CountyLane County
StateOregon
Coordinates44.09323, -123.63499
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
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 rating74 US tons
Inventory rating39 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans2
Design loadHS 20
Structure length60 ft (18.3 m)
Longest span34 ft (10.4 m)
Deck width28 ft (8.5 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic262 (2020)
Projected traffic307 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 Nelson Creek built?

It was built in 1979, making it 46 years old in 2025.

What condition is Nelson Mtn Road over Nelson 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 Nelson Creek carry?

About 262 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Nelson Mtn Road over Nelson Creek?

The structure is 60 ft (18.3 m) long with a longest span of 34 ft (10.4 m) and a deck 28 ft wide.

Who owns Nelson Mtn Road over Nelson Creek?

It is owned by the County Highway Agency.