US Bridges

Bellinger Scale RD over One Horse Slough

Fair

Linn County, Oregon · 029 MI N CR 20B · Structure no. 72229A072200297

Built
1980
45 years old
Condition
Fair
inspected June 2023
Type
Slab
Prestressed Concrete
Length
31 ft
1 main span
Daily traffic
1,288
2021 count
Owner
County
County Highway Agency

About this bridge

Bellinger Scale RD over One Horse Slough is a prestressed concrete slab carrying Bellinger Scale RD over One Horse Slough in Linn County, Oregon. It was built in 1980, so it is 45 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 1,288 vehicles a day, roughly 10% of them trucks, projected to reach 1,802 by 2041. The structure is 31 ft (9.4 m) long and 39 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesBellinger Scale RD
CrossesOne Horse Slough
Location029 MI N CR 20B
RouteCounty Highway C0722
StateOregon
Coordinates44.55034, -122.79148
Functional classRural Major 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.7 US tons
Inventory rating36 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length31 ft (9.4 m)
Longest span30 ft (9.1 m)
Deck width39 ft (11.8 m)
Roadway width36 ft (10.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,288 (2021)
Projected traffic1,802 by 2041
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 Bellinger Scale RD over One Horse Slough built?

It was built in 1980, making it 45 years old in 2025.

What condition is Bellinger Scale RD 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 Bellinger Scale RD over One Horse Slough carry?

About 1,288 vehicles per day (2021 count), of which roughly 10% are trucks.

How long is Bellinger Scale RD over One Horse Slough?

The structure is 31 ft (9.4 m) long with a longest span of 30 ft (9.1 m) and a deck 39 ft wide.

Who owns Bellinger Scale RD over One Horse Slough?

It is owned by the County Highway Agency.