US Bridges

I-5 (hwy 001) SB over Tunnel Mill Race

Good

Lane County, Oregon · 05.8 MI N Cottage Grove · Structure no. 20413 001 18049

Built
2007
18 years old
Condition
Good
inspected May 2024
Type
Slab
Prestressed Concrete
Length
60 ft
1 main span
Daily traffic
21,354
2022 count
Owner
State
State Highway Agency

About this bridge

I-5 (hwy 001) SB over Tunnel Mill Race is a prestressed concrete slab carrying I-5 (hwy 001) SB over Tunnel Mill Race in Lane County, Oregon. It was built in 2007, so it is 18 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 21,354 vehicles a day, roughly 26% of them trucks, projected to reach 22,500 by 2042. The structure is 60 ft (18.3 m) long and 45 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-5 (hwy 001) SB
CrossesTunnel Mill Race
Location05.8 MI N Cottage Grove
RouteInterstate 5
CountyLane County
StateOregon
Coordinates43.88396, -123.01398
Functional classRural Principal Arterial - Interstate

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 protection7 GoodSome minor problems.
Last inspectionMay 2024
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 geometry8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50.4 US tons
Inventory rating38.9 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length60 ft (18.3 m)
Longest span60 ft (18.3 m)
Deck width45 ft (13.7 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic21,354 (2022)
Projected traffic22,500 by 2042
Trucks26%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 I-5 (hwy 001) SB over Tunnel Mill Race built?

It was built in 2007, making it 18 years old in 2025.

What condition is I-5 (hwy 001) SB over Tunnel Mill Race 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 May 2024.

How much traffic does I-5 (hwy 001) SB over Tunnel Mill Race carry?

About 21,354 vehicles per day (2022 count), of which roughly 26% are trucks.

How long is I-5 (hwy 001) SB over Tunnel Mill Race?

The structure is 60 ft (18.3 m) long with a longest span of 60 ft (18.3 m) and a deck 45 ft wide.

Who owns I-5 (hwy 001) SB over Tunnel Mill Race?

It is owned by the State Highway Agency.