US Bridges

Bishop Road over Noble Canal

Fair

Gem County, Idaho · 0.2 N. 1.2 W. Letha · Structure no. 000000000028035

Built
1974
51 years old
Condition
Fair
inspected March 2023
Type
Tee Beam
Prestressed Concrete
Length
39 ft
1 main span
Daily traffic
50
2023 count
Owner
County
County Highway Agency

About this bridge

Bishop Road over Noble Canal is a prestressed concrete tee beam carrying Bishop Road over Noble Canal in Gem 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 50 vehicles a day, roughly 10% of them trucks, projected to reach 75 by 2039. The structure is 39 ft (11.9 m) long and 28 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesBishop Road
CrossesNoble Canal
Location0.2 N. 1.2 W. Letha
RouteCounty Highway 0
CountyGem County
StateIdaho
Coordinates43.89494, -116.67234
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 adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41.7 US tons
Inventory rating29.8 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length39 ft (11.9 m)
Longest span37 ft (11.3 m)
Deck width28 ft (8.5 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2023)
Projected traffic75 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Bishop Road over Noble Canal built?

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

What condition is Bishop Road over Noble Canal 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 Bishop Road over Noble Canal carry?

About 50 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Bishop Road over Noble Canal?

The structure is 39 ft (11.9 m) long with a longest span of 37 ft (11.3 m) and a deck 28 ft wide.

Who owns Bishop Road over Noble Canal?

It is owned by the County Highway Agency.