US Bridges

C114 Ol Exp Sta RD over Nine Mile Slough

Fair

Harney County, Oregon · 029 MI US 20 · Structure no. 22062 C11400291

Built
2012
13 years old
Condition
Fair
inspected September 2024
Type
Slab
Prestressed Concrete
Length
34 ft
1 main span
Daily traffic
248
2020 count
Owner
County
County Highway Agency

About this bridge

C114 Ol Exp Sta RD over Nine Mile Slough is a prestressed concrete slab carrying C114 Ol Exp Sta RD over Nine Mile Slough in Harney County, Oregon. It was built in 2012, so it is 13 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 248 vehicles a day, roughly 10% of them trucks, projected to reach 283 by 2025. The structure is 34 ft (10.4 m) long and 28 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesC114 Ol Exp Sta RD
CrossesNine Mile Slough
Location029 MI US 20
RouteCounty Highway C0114
StateOregon
Coordinates43.57268, -118.94063
Functional classRural Minor 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 protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40.3 US tons
Inventory rating31.1 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length34 ft (10.4 m)
Longest span33 ft (10.1 m)
Deck width28 ft (8.5 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic248 (2020)
Projected traffic283 by 2025
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 C114 Ol Exp Sta RD over Nine Mile Slough built?

It was built in 2012, making it 13 years old in 2025.

What condition is C114 Ol Exp Sta RD over Nine Mile Slough 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 September 2024.

How much traffic does C114 Ol Exp Sta RD over Nine Mile Slough carry?

About 248 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is C114 Ol Exp Sta RD over Nine Mile Slough?

The structure is 34 ft (10.4 m) long with a longest span of 33 ft (10.1 m) and a deck 28 ft wide.

Who owns C114 Ol Exp Sta RD over Nine Mile Slough?

It is owned by the County Highway Agency.