US Bridges

Or 99E (hwy 58) over Slough

Fair

Lane County, Oregon · 006 MI S Linn Lane CO LN · Structure no. 03939A058 02972

Built
1974
51 years old
Condition
Fair
inspected December 2023
Type
Slab
Prestressed Concrete
Length
370 ft
8 main spans
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 1974, so it is 51 years old, older 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 6 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 9,803 vehicles a day, roughly 19% of them trucks, projected to reach 9,900 by 2042. The structure is 370 ft (112.8 m) long and 60 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

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CarriesOr 99E (hwy 58)
CrossesSlough
Location006 MI S Linn Lane CO LN
RouteState Highway 99
CountyLane County
StateOregon
Coordinates44.26415, -123.18587
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to 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 rating38.9 US tons
Inventory rating30 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans8
Design loadHS 20
Structure length370 ft (112.8 m)
Longest span50 ft (15.2 m)
Deck width60 ft (18.3 m)
Roadway width48 ft (14.6 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 and pedestrian
CrossesRelief for waterway
Detour if closed8.7 mi (14 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—
NavigationNo navigation control on waterway

Frequently asked questions

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

It was built in 1974, making it 51 years old in 2025.

What condition is Or 99E (hwy 58) over Slough 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 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 370 ft (112.8 m) long with a longest span of 50 ft (15.2 m) and a deck 60 ft wide.

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

It is owned by the State Highway Agency.