US Bridges

C138 Silver CR RD over Silver Creek

GoodPosted for load

Harney County, Oregon · 006 MI US HWY 20 · Structure no. 25A18 C13800060

Built
1973
52 years old, rebuilt 1978
Condition
Good
inspected September 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
25 ft
1 main span
Daily traffic
123
2020 count
Owner
County
County Highway Agency

About this bridge

C138 Silver CR RD over Silver Creek is a wood or timber stringer/multi-beam or girder carrying C138 Silver CR RD over Silver Creek in Harney County, Oregon. It was built in 1973 and reconstructed in 1978, so it is 52 years old, older 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. Its operating status is: posted for load restriction.

It carries about 123 vehicles a day, roughly 20% of them trucks, projected to reach 138 by 2025. The structure is 25 ft (7.6 m) long and 25 ft wide. If it were closed, the detour would be 21.7 mi (35 km).

CarriesC138 Silver CR RD
CrossesSilver Creek
Location006 MI US HWY 20
RouteCounty Highway C0138
StateOregon
Coordinates43.5503, -119.53688
Functional classRural Major Collector

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.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating11.5 US tons
Inventory rating8.9 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadH 15
Structure length25 ft (7.6 m)
Longest span23 ft (7 m)
Deck width25 ft (7.5 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic123 (2020)
Projected traffic138 by 2025
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed21.7 mi (35 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 C138 Silver CR RD over Silver Creek built?

It was built in 1973, making it 52 years old in 2025. It was reconstructed in 1978.

What condition is C138 Silver CR RD over Silver Creek 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 September 2024.

How much traffic does C138 Silver CR RD over Silver Creek carry?

About 123 vehicles per day (2020 count), of which roughly 20% are trucks.

How long is C138 Silver CR RD over Silver Creek?

The structure is 25 ft (7.6 m) long with a longest span of 23 ft (7 m) and a deck 25 ft wide.

Who owns C138 Silver CR RD over Silver Creek?

It is owned by the County Highway Agency.