US Bridges

Access Road over Foster Dam Spillway

Fair

Linn County, Oregon · Foster Dam · Structure no. CEPNPPOR000FD01

Built
1964
61 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
212 ft
4 main spans
Daily traffic
200
2011 count
Owner
Federal
Corps of Engineers (Civil)

About this bridge

Access Road over Foster Dam Spillway is a prestressed concrete stringer/multi-beam or girder carrying Access Road over Foster Dam Spillway in Linn County, Oregon. It was built in 1964, so it is 61 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 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 200 vehicles a day, roughly 30% of them trucks, projected to reach 1,000 by 2041. The structure is 212 ft (64.6 m) long and 30 ft wide. If it were closed, the detour would be 31.7 mi (51 km).

Location

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CarriesAccess Road
CrossesFoster Dam Spillway
LocationFoster Dam
RouteState Highway 0
CountyLinn County
StateOregon
Coordinates44.41501, -122.67016
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating51.5 US tons
Inventory rating38.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length212 ft (64.6 m)
Longest span47 ft (14.2 m)
Deck width30 ft (9.1 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic200 (2011)
Projected traffic1,000 by 2041
Trucks30%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed31.7 mi (51 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerCorps of Engineers (Civil)
Maintained byCorps of Engineers (Civil)
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$812,000 (2024 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Access Road over Foster Dam Spillway built?

It was built in 1964, making it 61 years old in 2025.

What condition is Access Road over Foster Dam Spillway 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 May 2023.

How much traffic does Access Road over Foster Dam Spillway carry?

About 200 vehicles per day (2011 count), of which roughly 30% are trucks.

How long is Access Road over Foster Dam Spillway?

The structure is 212 ft (64.6 m) long with a longest span of 47 ft (14.2 m) and a deck 30 ft wide.

Who owns Access Road over Foster Dam Spillway?

It is owned by the Corps of Engineers (Civil).