US Bridges

3-14 over Twenty Mile Creek

Fair

Lake County, Oregon · 113 South HWY 140 · Structure no. 37C0313-1401130

Built
1970
55 years old
Condition
Fair
inspected July 2024
Type
Slab
Prestressed Concrete
Length
54 ft
1 main span
Daily traffic
123
2020 count
Owner
County
County Highway Agency

About this bridge

3-14 over Twenty Mile Creek is a prestressed concrete slab carrying 3-14 over Twenty Mile Creek in Lake County, Oregon. It was built in 1970, so it is 55 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 123 vehicles a day, roughly 12% of them trucks, projected to reach 128 by 2025. The structure is 54 ft (16.5 m) long and 32 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Carries3-14
CrossesTwenty Mile Creek
Location113 South HWY 140
RouteCounty Highway C0325
StateOregon
Coordinates42.05293, -119.96876
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
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 rating58 US tons
Inventory rating35.1 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length54 ft (16.5 m)
Longest span52 ft (15.9 m)
Deck width32 ft (9.8 m)
Roadway width31 ft (9.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic123 (2020)
Projected traffic128 by 2025
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 3-14 over Twenty Mile Creek built?

It was built in 1970, making it 55 years old in 2025.

What condition is 3-14 over Twenty Mile 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 July 2024.

How much traffic does 3-14 over Twenty Mile Creek carry?

About 123 vehicles per day (2020 count), of which roughly 12% are trucks.

How long is 3-14 over Twenty Mile Creek?

The structure is 54 ft (16.5 m) long with a longest span of 52 ft (15.9 m) and a deck 32 ft wide.

Who owns 3-14 over Twenty Mile Creek?

It is owned by the County Highway Agency.