US Bridges

Seavey Loop RD over Berkshire Slough

Fair

Lane County, Oregon · 010 MI N I5 · Structure no. 39C157188100280

Built
1977
48 years old
Condition
Fair
inspected May 2023
Type
Slab
Prestressed Concrete
Length
66 ft
3 main spans
Daily traffic
2,573
2020 count
Owner
County
County Highway Agency

About this bridge

Seavey Loop RD over Berkshire Slough is a prestressed concrete slab carrying Seavey Loop RD over Berkshire Slough in Lane County, Oregon. It was built in 1977, so it is 48 years old, younger 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 5 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 2,573 vehicles a day, roughly 5% of them trucks, projected to reach 2,963 by 2025. The structure is 66 ft (20.1 m) long and 32 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesSeavey Loop RD
CrossesBerkshire Slough
Location010 MI N I5
RouteCounty Highway C1881
CountyLane County
StateOregon
Coordinates44.01158, -123.00535
Functional classUrban Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating84 US tons
Inventory rating41 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans3
Design loadHS 20
Structure length66 ft (20.1 m)
Longest span21 ft (6.4 m)
Deck width32 ft (9.7 m)
Roadway width31 ft (9.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,573 (2020)
Projected traffic2,963 by 2025
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Seavey Loop RD over Berkshire Slough built?

It was built in 1977, making it 48 years old in 2025.

What condition is Seavey Loop RD over Berkshire 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 May 2023.

How much traffic does Seavey Loop RD over Berkshire Slough carry?

About 2,573 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is Seavey Loop RD over Berkshire Slough?

The structure is 66 ft (20.1 m) long with a longest span of 21 ft (6.4 m) and a deck 32 ft wide.

Who owns Seavey Loop RD over Berkshire Slough?

It is owned by the County Highway Agency.