US Bridges

Or 99E (hwy 58) over Slough

Good

Lane County, Oregon · 014 MI S Linn Lane CO LN · Structure no. 03941A058 03045

Built
1976
49 years old
Condition
Good
inspected December 2023
Type
Slab
Prestressed Concrete
Length
67 ft
1 main span
Daily traffic
9,803
2022 count
Owner
State
State Highway Agency

About this bridge

Or 99E (hwy 58) over Slough is a prestressed concrete slab carrying Or 99E (hwy 58) over Slough in Lane County, Oregon. It was built in 1976, so it is 49 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 9,803 vehicles a day, roughly 19% of them trucks, projected to reach 9,900 by 2042. The structure is 67 ft (20.3 m) long and 52 ft wide. If it were closed, the detour would be 31.1 mi (50 km).

CarriesOr 99E (hwy 58)
CrossesSlough
Location014 MI S Linn Lane CO LN
RouteState Highway 99
StateOregon
Coordinates44.25483, -123.19361
Functional classRural Minor Arterial

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionDecember 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 geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67.5 US tons
Inventory rating52.1 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length67 ft (20.3 m)
Longest span67 ft (20.3 m)
Deck width52 ft (15.8 m)
Roadway width49 ft (14.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,803 (2022)
Projected traffic9,900 by 2042
Trucks19%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRelief for waterway
Detour if closed31.1 mi (50 km)
TollOn a free road
National Highway SystemNo

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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Or 99E (hwy 58) over Slough built?

It was built in 1976, making it 49 years old in 2025.

What condition is Or 99E (hwy 58) over Slough 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 December 2023.

How much traffic does Or 99E (hwy 58) over Slough carry?

About 9,803 vehicles per day (2022 count), of which roughly 19% are trucks.

How long is Or 99E (hwy 58) over Slough?

The structure is 67 ft (20.3 m) long with a longest span of 67 ft (20.3 m) and a deck 52 ft wide.

Who owns Or 99E (hwy 58) over Slough?

It is owned by the State Highway Agency.