US Bridges

Nelson Mtn Road over Knapp Creek

Good

Lane County, Oregon · MP 5.90 Nelson Mt Rd. · Structure no. 21405 467000590

Built
2010
15 years old
Condition
Good
inspected September 2023
Type
Culvert
Concrete
Length
37 ft
1 main span
Daily traffic
273
2020 count
Owner
County
County Highway Agency

About this bridge

Nelson Mtn Road over Knapp Creek is a concrete culvert carrying Nelson Mtn Road over Knapp Creek in Lane County, Oregon. It was built in 2010, so it is 15 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 37 ft (11.2 m) long. If it were closed, the detour would be 18.6 mi (30 km).

Location

Open in Google Maps
CarriesNelson Mtn Road
CrossesKnapp Creek
LocationMP 5.90 Nelson Mt Rd.
RouteCounty Highway C3670
CountyLane County
StateOregon
Coordinates44.0844, -123.5771
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
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
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
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating43.2 US tons
Inventory rating33.2 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length37 ft (11.2 m)
Longest span37 ft (11.2 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 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 Knapp Creek built?

It was built in 2010, making it 15 years old in 2025.

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

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

How long is Nelson Mtn Road over Knapp Creek?

The structure is 37 ft (11.2 m) long with a longest span of 37 ft (11.2 m).

Who owns Nelson Mtn Road over Knapp Creek?

It is owned by the County Highway Agency.