US Bridges

Nelson Mtn Road over Shady Creek

Fair

Lane County, Oregon · 035 MI NE of Walton · Structure no. 39C391367000845

Built
1978
47 years old
Condition
Fair
inspected September 2023
Type
Slab
Prestressed Concrete
Length
28 ft
1 main span
Daily traffic
283
2020 count
Owner
County
County Highway Agency

About this bridge

Nelson Mtn Road over Shady Creek is a prestressed concrete slab carrying Nelson Mtn Road over Shady Creek 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 283 vehicles a day, roughly 10% of them trucks, projected to reach 323 by 2025. The structure is 28 ft (8.5 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
CrossesShady Creek
Location035 MI NE of Walton
RouteCounty Highway C3670
CountyLane County
StateOregon
Coordinates44.0623, -123.56726
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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2023
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 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 rating79 US tons
Inventory rating47 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length28 ft (8.5 m)
Longest span27 ft (8.2 m)
Deck width28 ft (8.5 m)
Roadway width27 ft (8.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic283 (2020)
Projected traffic323 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 Shady Creek built?

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

What condition is Nelson Mtn Road over Shady 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 September 2023.

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

About 283 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Nelson Mtn Road over Shady Creek?

The structure is 28 ft (8.5 m) long with a longest span of 27 ft (8.2 m) and a deck 28 ft wide.

Who owns Nelson Mtn Road over Shady Creek?

It is owned by the County Highway Agency.