US Bridges

SR 397 / Ainsworth over South 4th Ave / BNSF RR

Good

Franklin County, Washington · 0.9 N Franklin CO · Structure no. 002003950000000

Built
2007
18 years old
Condition
Good
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
239 ft
2 main spans
Daily traffic
8,746
2023 count
Owner
State
State Highway Agency

About this bridge

SR 397 / Ainsworth over South 4th Ave / BNSF RR is a prestressed concrete continuous stringer/multi-beam or girder carrying SR 397 / Ainsworth over South 4th Ave / BNSF RR in Franklin County, Washington. It was built in 2007, so it is 18 years old, younger than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 8,746 vehicles a day, roughly 12% of them trucks, projected to reach 10,861 by 2039. The structure is 239 ft (72.8 m) long and 49 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

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CarriesSR 397 / Ainsworth
CrossesSouth 4th Ave / BNSF RR
Location0.9 N Franklin CO
RouteState Highway 397
CountyFranklin County
StateWashington
Coordinates46.22194, -119.09265
Functional classUrban Other Principal Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57 US tons
Inventory rating34 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHL 93
Structure length239 ft (72.8 m)
Longest span115 ft (35.1 m)
Deck width49 ft (15 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,746 (2023)
Projected traffic10,861 by 2039
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway and railroad
Detour if closed8.7 mi (14 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$4.8 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR 397 / Ainsworth over South 4th Ave / BNSF RR built?

It was built in 2007, making it 18 years old in 2025.

What condition is SR 397 / Ainsworth over South 4th Ave / BNSF RR in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2023.

How much traffic does SR 397 / Ainsworth over South 4th Ave / BNSF RR carry?

About 8,746 vehicles per day (2023 count), of which roughly 12% are trucks.

How long is SR 397 / Ainsworth over South 4th Ave / BNSF RR?

The structure is 239 ft (72.8 m) long with a longest span of 115 ft (35.1 m) and a deck 49 ft wide.

Who owns SR 397 / Ainsworth over South 4th Ave / BNSF RR?

It is owned by the State Highway Agency.