US Bridges

Three Lakes RD over Three Lakes / Oak Creek

Fair

Linn County, Oregon · 026 MI South HWY 20 · Structure no. 12589 033700259

Built
1960
65 years old, rebuilt 1995
Condition
Fair
inspected October 2024
Type
Channel Beam
Concrete
Length
96 ft
5 main spans
Daily traffic
1,133
2021 count
Owner
County
County Highway Agency

About this bridge

Three Lakes RD over Three Lakes / Oak Creek is a concrete channel beam carrying Three Lakes RD over Three Lakes / Oak Creek in Linn County, Oregon. It was built in 1960 and reconstructed in 1995, so it is 65 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 5 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 1,133 vehicles a day, roughly 10% of them trucks, projected to reach 1,596 by 2041. The structure is 96 ft (29.3 m) long and 30 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

Location

Open in Google Maps
CarriesThree Lakes RD
CrossesThree Lakes / Oak Creek
Location026 MI South HWY 20
RouteCounty Highway C0337
CountyLinn County
StateOregon
Coordinates44.59002, -123.05915
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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating37.8 US tons
Inventory rating29.3 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans5
Design loadHS 20
Structure length96 ft (29.3 m)
Longest span19 ft (5.8 m)
Deck width30 ft (9 m)
Roadway width27 ft (8.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,133 (2021)
Projected traffic1,596 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 Three Lakes RD over Three Lakes / Oak Creek built?

It was built in 1960, making it 65 years old in 2025. It was reconstructed in 1995.

What condition is Three Lakes RD over Three Lakes / Oak Creek 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 Three Lakes RD over Three Lakes / Oak Creek carry?

About 1,133 vehicles per day (2021 count), of which roughly 10% are trucks.

How long is Three Lakes RD over Three Lakes / Oak Creek?

The structure is 96 ft (29.3 m) long with a longest span of 19 ft (5.8 m) and a deck 30 ft wide.

Who owns Three Lakes RD over Three Lakes / Oak Creek?

It is owned by the County Highway Agency.