US Bridges

US 20 (hwy 007) over Silver Creek

Fair

Harney County, Oregon · 004 MI W HWY 49 JCT · Structure no. 03505A007 10423

Built
1956
69 years old
Condition
Fair
inspected November 2023
Type
Channel Beam
Concrete
Length
46 ft
2 main spans
Daily traffic
2,325
2022 count
Owner
State
State Highway Agency

About this bridge

US 20 (hwy 007) over Silver Creek is a concrete channel beam carrying US 20 (hwy 007) over Silver Creek in Harney County, Oregon. It was built in 1956, so it is 69 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 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 2,325 vehicles a day, roughly 28% of them trucks, projected to reach 2,500 by 2042. The structure is 46 ft (14 m) long and 33 ft wide. If it were closed, the detour would be 102.5 mi (165 km).

Location

Open in Google Maps
CarriesUS 20 (hwy 007)
CrossesSilver Creek
Location004 MI W HWY 49 JCT
RouteU.S. Route 20
CountyHarney County
StateOregon
Coordinates43.54197, -119.51571
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating27.9 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length46 ft (14 m)
Longest span23 ft (7 m)
Deck width33 ft (10.1 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,325 (2022)
Projected traffic2,500 by 2042
Trucks28%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed102.5 mi (165 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was US 20 (hwy 007) over Silver Creek built?

It was built in 1956, making it 69 years old in 2025.

What condition is US 20 (hwy 007) over Silver Creek 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 November 2023.

How much traffic does US 20 (hwy 007) over Silver Creek carry?

About 2,325 vehicles per day (2022 count), of which roughly 28% are trucks.

How long is US 20 (hwy 007) over Silver Creek?

The structure is 46 ft (14 m) long with a longest span of 23 ft (7 m) and a deck 33 ft wide.

Who owns US 20 (hwy 007) over Silver Creek?

It is owned by the State Highway Agency.