US Bridges

Nelson Mtn Road over Chickahominy Creek

Good

Lane County, Oregon · 050 MI NE of Walton · Structure no. 39C389367000765

Built
1991
34 years old
Condition
Good
inspected September 2023
Type
Slab
Prestressed Concrete
Length
60 ft
1 main span
Daily traffic
273
2020 count
Owner
County
County Highway Agency

About this bridge

Nelson Mtn Road over Chickahominy Creek is a prestressed concrete slab carrying Nelson Mtn Road over Chickahominy Creek in Lane County, Oregon. It was built in 1991, so it is 34 years old, younger than the Oregon average of 49.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 273 vehicles a day, roughly 10% of them trucks, projected to reach 318 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).

CarriesNelson Mtn Road
CrossesChickahominy Creek
Location050 MI NE of Walton
RouteCounty Highway C3670
StateOregon
Coordinates44.07167, -123.56197
Functional classRural Minor Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than 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 rating86 US tons
Inventory rating52 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length60 ft (18.3 m)
Longest span59 ft (18 m)
Deck width28 ft (8.6 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic273 (2020)
Projected traffic318 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 Chickahominy Creek built?

It was built in 1991, making it 34 years old in 2025.

What condition is Nelson Mtn Road over Chickahominy Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2023.

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

About 273 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Nelson Mtn Road over Chickahominy Creek?

The structure is 60 ft (18.3 m) long with a longest span of 59 ft (18 m) and a deck 28 ft wide.

Who owns Nelson Mtn Road over Chickahominy Creek?

It is owned by the County Highway Agency.