US Bridges

Balston Road over Trib of S Yamhill River

Fair

Polk County, Oregon · 030 SE Sheridan · Structure no. 53C006065500013

Built
1965
60 years old
Condition
Fair
inspected August 2024
Type
Slab
Prestressed Concrete
Length
29 ft
1 main span
Daily traffic
624
2020 count
Owner
County
County Highway Agency

About this bridge

Balston Road over Trib of S Yamhill River is a prestressed concrete slab carrying Balston Road over Trib of S Yamhill River in Polk 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 624 vehicles a day, roughly 10% of them trucks, projected to reach 902 by 2040. The structure is 29 ft (8.8 m) long and 27 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesBalston Road
CrossesTrib of S Yamhill River
Location030 SE Sheridan
RouteCounty Highway 0
CountyPolk County
StateOregon
Coordinates45.07332, -123.35691
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 inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
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 rating36.8 US tons
Inventory rating28.2 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length29 ft (8.8 m)
Longest span27 ft (8.2 m)
Deck width27 ft (8.2 m)
Roadway width26 ft (7.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic624 (2020)
Projected traffic902 by 2040
Trucks10%
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 Balston Road over Trib of S Yamhill River built?

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

What condition is Balston Road over Trib of S Yamhill River 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 August 2024.

How much traffic does Balston Road over Trib of S Yamhill River carry?

About 624 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Balston Road over Trib of S Yamhill River?

The structure is 29 ft (8.8 m) long with a longest span of 27 ft (8.2 m) and a deck 27 ft wide.

Who owns Balston Road over Trib of S Yamhill River?

It is owned by the County Highway Agency.