US Bridges

Tangent Loop RD over Lake Creek

Poor

Linn County, Oregon · 20 MI S Tangent · Structure no. 12570A040100198

Built
1981
44 years old
Condition
Poor
inspected October 2024
Type
Slab
Prestressed Concrete
Length
60 ft
2 main spans
Daily traffic
175
2021 count
Owner
County
County Highway Agency

About this bridge

Tangent Loop RD over Lake Creek is a prestressed concrete slab carrying Tangent Loop RD over Lake Creek in Linn County, Oregon. It was built in 1981, so it is 44 years old, younger than the Oregon average of 49.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: open, would be posted or closed except for temporary shoring.

It carries about 175 vehicles a day, roughly 10% of them trucks, projected to reach 258 by 2041. The structure is 60 ft (18.3 m) long and 32 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesTangent Loop RD
CrossesLake Creek
Location20 MI S Tangent
RouteCounty Highway C0401
StateOregon
Coordinates44.5237, -123.09415
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, would be posted or closed except for temporary shoring
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36.4 US tons
Inventory rating28.2 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans2
Design loadHS 20
Structure length60 ft (18.3 m)
Longest span30 ft (9.1 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic175 (2021)
Projected traffic258 by 2041
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRelief for waterway
Detour if closed6.2 mi (10 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 Loop RD over Lake Creek built?

It was built in 1981, making it 44 years old in 2025.

What condition is Tangent Loop RD over Lake Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in October 2024.

How much traffic does Tangent Loop RD over Lake Creek carry?

About 175 vehicles per day (2021 count), of which roughly 10% are trucks.

How long is Tangent Loop RD over Lake Creek?

The structure is 60 ft (18.3 m) long with a longest span of 30 ft (9.1 m) and a deck 32 ft wide.

Who owns Tangent Loop RD over Lake Creek?

It is owned by the County Highway Agency.