US Bridges

Tangent DR over Calapooia River

Fair

Linn County, Oregon · 020 MI W HWY 99E · Structure no. 20257 012200203

Built
2008
17 years old
Condition
Fair
inspected October 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
121 ft
1 main span
Daily traffic
469
2021 count
Owner
County
County Highway Agency

About this bridge

Tangent DR over Calapooia River is a prestressed concrete box beam or girders - multiple carrying Tangent DR over Calapooia River in Linn County, Oregon. It was built in 2008, so it is 17 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 469 vehicles a day, roughly 10% of them trucks, projected to reach 647 by 2041. The structure is 121 ft (36.9 m) long and 32 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

CarriesTangent DR
CrossesCalapooia River
Location020 MI W HWY 99E
RouteCounty Highway A0479
StateOregon
Coordinates44.53341, -123.14409
Functional classRural Major Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure8 Very GoodNo problems noted.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating70 US tons
Inventory rating53.9 US tons

Structure

MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHL 93
Structure length121 ft (36.9 m)
Longest span121 ft (36.9 m)
Deck width32 ft (9.8 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic469 (2021)
Projected traffic647 by 2041
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed2.5 mi (4 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 Tangent DR over Calapooia River built?

It was built in 2008, making it 17 years old in 2025.

What condition is Tangent DR over Calapooia River 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 Tangent DR over Calapooia River carry?

About 469 vehicles per day (2021 count), of which roughly 10% are trucks.

How long is Tangent DR over Calapooia River?

The structure is 121 ft (36.9 m) long with a longest span of 121 ft (36.9 m) and a deck 32 ft wide.

Who owns Tangent DR over Calapooia River?

It is owned by the County Highway Agency.