US Bridges

Usfs RD over Silvies River (seneca)

Fair

Grant County, Oregon · 0.15 MI W US 395 · Structure no. 23B001 015

Built
1990
35 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
65 ft
3 main spans
Daily traffic
20
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

Usfs RD over Silvies River (seneca) is a wood or timber stringer/multi-beam or girder carrying Usfs RD over Silvies River (seneca) in Grant County, Oregon. It was built in 1990, so it is 35 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 20 vehicles a day, projected to reach 25 by 2025. The structure is 65 ft (19.8 m) long and 16 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesUsfs RD
CrossesSilvies River (seneca)
Location0.15 MI W US 395
CountyGrant County
StateOregon
Coordinates44.1332, -118.9751
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating26.8 US tons
Inventory rating20.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadUnknown
Structure length65 ft (19.8 m)
Longest span21 ft (6.4 m)
Deck width16 ft (4.9 m)
Roadway width11 ft (3.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (2020)
Projected traffic25 by 2025
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$333,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Usfs RD over Silvies River (seneca) built?

It was built in 1990, making it 35 years old in 2025.

What condition is Usfs RD over Silvies River (seneca) 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 October 2024.

How much traffic does Usfs RD over Silvies River (seneca) carry?

About 20 vehicles per day (2020 count).

How long is Usfs RD over Silvies River (seneca)?

The structure is 65 ft (19.8 m) long with a longest span of 21 ft (6.4 m) and a deck 16 ft wide.

Who owns Usfs RD over Silvies River (seneca)?

It is owned by the City or Municipal Highway Agency.