US Bridges

US 97 (hwy 004) over Klamath Straits

Good

Klamath County, Oregon · 104 MI S Klamath Falls · Structure no. 01794A004 28585

Built
1981
44 years old
Condition
Good
inspected February 2023
Type
Slab
Prestressed Concrete
Length
73 ft
1 main span
Daily traffic
4,467
2022 count
Owner
State
State Highway Agency

About this bridge

US 97 (hwy 004) over Klamath Straits is a prestressed concrete slab carrying US 97 (hwy 004) over Klamath Straits in Klamath County, Oregon. It was built in 1981, so it is 44 years old, younger than the Oregon average of 49.9 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 4,467 vehicles a day, roughly 27% of them trucks, projected to reach 5,100 by 2042. The structure is 73 ft (22.3 m) long and 48 ft wide. If it were closed, the detour would be 16.8 mi (27 km).

Location

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CarriesUS 97 (hwy 004)
CrossesKlamath Straits
Location104 MI S Klamath Falls
RouteU.S. Route 97
CountyKlamath County
StateOregon
Coordinates42.0811, -121.8447
Functional classRural Principal Arterial - Other

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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36.4 US tons
Inventory rating28.2 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 25 or greater
Structure length73 ft (22.3 m)
Longest span70 ft (21.3 m)
Deck width48 ft (14.7 m)
Roadway width47 ft (14.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,467 (2022)
Projected traffic5,100 by 2042
Trucks27%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.8 mi (27 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was US 97 (hwy 004) over Klamath Straits built?

It was built in 1981, making it 44 years old in 2025.

What condition is US 97 (hwy 004) over Klamath Straits 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 February 2023.

How much traffic does US 97 (hwy 004) over Klamath Straits carry?

About 4,467 vehicles per day (2022 count), of which roughly 27% are trucks.

How long is US 97 (hwy 004) over Klamath Straits?

The structure is 73 ft (22.3 m) long with a longest span of 70 ft (21.3 m) and a deck 48 ft wide.

Who owns US 97 (hwy 004) over Klamath Straits?

It is owned by the State Highway Agency.