US Bridges

N 1200 E RD over Owsley Cnl;sw.Terreton

Fair

Jefferson County, Idaho · 0.9 S. 1.0 W. Terreton · Structure no. 000000000032580

Built
1974
51 years old
Condition
Fair
inspected March 2023
Type
Tee Beam
Prestressed Concrete
Length
28 ft
1 main span
Daily traffic
40
2023 count
Owner
County
County Highway Agency

About this bridge

N 1200 E RD over Owsley Cnl;sw.Terreton is a prestressed concrete tee beam carrying N 1200 E RD over Owsley Cnl;sw.Terreton in Jefferson County, Idaho. It was built in 1974, so it is 51 years old, older than the Idaho average of 45.3 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 40 vehicles a day, roughly 10% of them trucks, projected to reach 60 by 2039. The structure is 28 ft (8.5 m) long and 28 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesN 1200 E RD
CrossesOwsley Cnl;sw.Terreton
Location0.9 S. 1.0 W. Terreton
RouteCounty Highway 0
CountyJefferson County
StateIdaho
Coordinates43.82703, -112.45583
Functional classRural Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
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 inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being 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 rating38.7 US tons
Inventory rating27.8 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 15
Structure length28 ft (8.5 m)
Longest span27 ft (8.2 m)
Deck width28 ft (8.5 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40 (2023)
Projected traffic60 by 2039
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$333,000 (2017 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was N 1200 E RD over Owsley Cnl;sw.Terreton built?

It was built in 1974, making it 51 years old in 2025.

What condition is N 1200 E RD over Owsley Cnl;sw.Terreton 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 March 2023.

How much traffic does N 1200 E RD over Owsley Cnl;sw.Terreton carry?

About 40 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is N 1200 E RD over Owsley Cnl;sw.Terreton?

The structure is 28 ft (8.5 m) long with a longest span of 27 ft (8.2 m) and a deck 28 ft wide.

Who owns N 1200 E RD over Owsley Cnl;sw.Terreton?

It is owned by the County Highway Agency.