US Bridges

Shady Oak Lane over One Horse Slough

Fair

Linn County, Oregon · 0.7 MI N. of Brewster · Structure no. 19687 360100041

Built
2002
23 years old
Condition
Fair
inspected June 2023
Type
Slab
Prestressed Concrete
Length
62 ft
1 main span
Daily traffic
56
2021 count
Owner
Local
Other Local Agency

About this bridge

Shady Oak Lane over One Horse Slough is a prestressed concrete slab carrying Shady Oak Lane over One Horse Slough in Linn County, Oregon. It was built in 2002, so it is 23 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 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 56 vehicles a day, projected to reach 82 by 2041. The structure is 62 ft (18.8 m) long and 24 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesShady Oak Lane
CrossesOne Horse Slough
Location0.7 MI N. of Brewster
CountyLinn County
StateOregon
Coordinates44.58627, -122.86151
Functional classRural Local

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating32.8 US tons
Inventory rating25.4 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 25 or greater
Structure length62 ft (18.8 m)
Longest span60 ft (18.3 m)
Deck width24 ft (7.3 m)
Roadway width23 ft (7.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic56 (2021)
Projected traffic82 by 2041
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerOther Local Agency
Maintained byOther Local 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 Shady Oak Lane over One Horse Slough built?

It was built in 2002, making it 23 years old in 2025.

What condition is Shady Oak Lane over One Horse 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 June 2023.

How much traffic does Shady Oak Lane over One Horse Slough carry?

About 56 vehicles per day (2021 count).

How long is Shady Oak Lane over One Horse Slough?

The structure is 62 ft (18.8 m) long with a longest span of 60 ft (18.3 m) and a deck 24 ft wide.

Who owns Shady Oak Lane over One Horse Slough?

It is owned by the Other Local Agency.