US Bridges

US 97 (hwy 004) over Williamson River

Fair

Klamath County, Oregon · 031 MI S HWY 422 JCT · Structure no. 02475A004 25221

Built
1989
36 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
342 ft
3 main spans
Daily traffic
6,854
2022 count
Owner
State
State Highway Agency

About this bridge

US 97 (hwy 004) over Williamson River is a prestressed concrete continuous stringer/multi-beam or girder carrying US 97 (hwy 004) over Williamson River in Klamath County, Oregon. It was built in 1989, so it is 36 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 6,854 vehicles a day, roughly 18% of them trucks, projected to reach 7,300 by 2042. The structure is 342 ft (104.2 m) long and 61 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesUS 97 (hwy 004)
CrossesWilliamson River
Location031 MI S HWY 422 JCT
RouteU.S. Route 97
CountyKlamath County
StateOregon
Coordinates42.52493, -121.88505
Functional classRural Principal Arterial - Other

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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating21.4 US tons
Inventory rating16.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length342 ft (104.2 m)
Longest span119 ft (36.3 m)
Deck width61 ft (18.5 m)
Roadway width58 ft (17.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,854 (2022)
Projected traffic7,300 by 2042
Trucks18%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
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 statusNot eligible for the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$1.8 million
NavigationNo navigation control on waterway

Frequently asked questions

When was US 97 (hwy 004) over Williamson River built?

It was built in 1989, making it 36 years old in 2025.

What condition is US 97 (hwy 004) over Williamson 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 July 2023.

How much traffic does US 97 (hwy 004) over Williamson River carry?

About 6,854 vehicles per day (2022 count), of which roughly 18% are trucks.

How long is US 97 (hwy 004) over Williamson River?

The structure is 342 ft (104.2 m) long with a longest span of 119 ft (36.3 m) and a deck 61 ft wide.

Who owns US 97 (hwy 004) over Williamson River?

It is owned by the State Highway Agency.