US Bridges

NW Ryals Ave over Bowers Slough

Fair

Benton County, Oregon · 2.0 MI E of Adair Village · Structure no. 09464 932 00201

Built
1965
60 years old
Condition
Fair
inspected July 2024
Type
Slab
Concrete
Length
24 ft
1 main span
Daily traffic
917
2020 count
Owner
County
County Highway Agency

About this bridge

NW Ryals Ave over Bowers Slough is a concrete slab carrying NW Ryals Ave over Bowers Slough in Benton County, Oregon. It was built in 1965, so it is 60 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 917 vehicles a day, roughly 10% of them trucks, projected to reach 1,236 by 2040. The structure is 24 ft (7.3 m) long and 36 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesNW Ryals Ave
CrossesBowers Slough
Location2.0 MI E of Adair Village
RouteCounty Highway 0
CountyBenton County
StateOregon
Coordinates44.67048, -123.18624
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 protection7 GoodSome minor problems.
Last inspectionJuly 2024
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 rating66 US tons
Inventory rating40 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length24 ft (7.3 m)
Longest span22 ft (6.7 m)
Deck width36 ft (11 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic917 (2020)
Projected traffic1,236 by 2040
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 NW Ryals Ave over Bowers Slough built?

It was built in 1965, making it 60 years old in 2025.

What condition is NW Ryals Ave over Bowers 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 July 2024.

How much traffic does NW Ryals Ave over Bowers Slough carry?

About 917 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is NW Ryals Ave over Bowers Slough?

The structure is 24 ft (7.3 m) long with a longest span of 22 ft (6.7 m) and a deck 36 ft wide.

Who owns NW Ryals Ave over Bowers Slough?

It is owned by the County Highway Agency.