US Bridges

North Bridge Rd. over Silvies River (seneca)

Fair

Grant County, Oregon · MP 0.37 · Structure no. 23899 000 00037

Built
1979
46 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
56 ft
4 main spans
Daily traffic
12
2010 count
Owner
City
City or Municipal Highway Agency

About this bridge

North Bridge Rd. over Silvies River (seneca) is a wood or timber stringer/multi-beam or girder carrying North Bridge Rd. over Silvies River (seneca) in Grant County, Oregon. It was built in 1979, so it is 46 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 12 vehicles a day, projected to reach 20 by 2030. The structure is 56 ft (17.2 m) long and 14 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesNorth Bridge Rd.
CrossesSilvies River (seneca)
LocationMP 0.37
RouteCity Street C0000
CountyGrant County
StateOregon
Coordinates44.141, -118.97959
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
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 evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating85.3 US tons
Inventory rating65.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans4
Design loadUnknown
Structure length56 ft (17.2 m)
Longest span15 ft (4.6 m)
Deck width14 ft (4.3 m)
Roadway width10 ft (3.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12 (2010)
Projected traffic20 by 2030
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was North Bridge Rd. over Silvies River (seneca) built?

It was built in 1979, making it 46 years old in 2025.

What condition is North Bridge 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 North Bridge Rd. over Silvies River (seneca) carry?

About 12 vehicles per day (2010 count).

How long is North Bridge Rd. over Silvies River (seneca)?

The structure is 56 ft (17.2 m) long with a longest span of 15 ft (4.6 m) and a deck 14 ft wide.

Who owns North Bridge Rd. over Silvies River (seneca)?

It is owned by the City or Municipal Highway Agency.