US Bridges

US 20 (hwy 33) over Tumtum River

Fair

Lincoln County, Oregon · 8 85 MI E of Eddyville · Structure no. 17027 033 03231

Built
1989
36 years old
Condition
Fair
inspected July 2024
Type
Culvert
Steel
Length
22 ft
1 main span
Daily traffic
6,930
2022 count
Owner
State
State Highway Agency

About this bridge

US 20 (hwy 33) over Tumtum River is a steel culvert carrying US 20 (hwy 33) over Tumtum River in Lincoln 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 5 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 6,930 vehicles a day, roughly 16% of them trucks, projected to reach 8,900 by 2042. The structure is 22 ft (6.7 m) long. If it were closed, the detour would be 34.8 mi (56 km).

Location

Open in Google Maps
CarriesUS 20 (hwy 33)
CrossesTumtum River
Location8 85 MI E of Eddyville
RouteU.S. Route 20
CountyLincoln County
StateOregon
Coordinates44.6099, -123.6284
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating98.9 US tons
Inventory rating76.1 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans1
Design loadHS 25 or greater
Structure length22 ft (6.7 m)
Longest span19 ft (5.9 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,930 (2022)
Projected traffic8,900 by 2042
Trucks16%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed34.8 mi (56 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 20 (hwy 33) over Tumtum River built?

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

What condition is US 20 (hwy 33) over Tumtum 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 2024.

How much traffic does US 20 (hwy 33) over Tumtum River carry?

About 6,930 vehicles per day (2022 count), of which roughly 16% are trucks.

How long is US 20 (hwy 33) over Tumtum River?

The structure is 22 ft (6.7 m) long with a longest span of 19 ft (5.9 m).

Who owns US 20 (hwy 33) over Tumtum River?

It is owned by the State Highway Agency.