US Bridges

US 30 over Noble Canal

Fair

Payette County, Idaho · 0.1 W. New Plymouth · Structure no. 000000000013465

Built
1956
69 years old, rebuilt 2019
Condition
Fair
inspected February 2021
Type
Frame
Concrete
Length
32 ft
1 main span
Daily traffic
4,700
2023 count
Owner
State
State Highway Agency

About this bridge

US 30 over Noble Canal is a concrete frame carrying US 30 over Noble Canal in Payette County, Idaho. It was built in 1956 and reconstructed in 2019, so it is 69 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 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 4,700 vehicles a day, roughly 8% of them trucks, projected to reach 7,050 by 2042. The structure is 32 ft (9.8 m) long and 48 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesUS 30
CrossesNoble Canal
Location0.1 W. New Plymouth
RouteU.S. Route 30
CountyPayette County
StateIdaho
Coordinates43.97461, -116.82808
Functional classRural Minor Arterial

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 protection8 Very GoodNo problems noted.
Last inspectionFebruary 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53 US tons
Inventory rating32 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length32 ft (9.8 m)
Longest span32 ft (9.8 m)
Deck width48 ft (14.6 m)
Roadway width45 ft (13.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,700 (2023)
Projected traffic7,050 by 2042
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 US 30 over Noble Canal built?

It was built in 1956, making it 69 years old in 2025. It was reconstructed in 2019.

What condition is US 30 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 February 2021.

How much traffic does US 30 over Noble Canal carry?

About 4,700 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is US 30 over Noble Canal?

The structure is 32 ft (9.8 m) long with a longest span of 32 ft (9.8 m) and a deck 48 ft wide.

Who owns US 30 over Noble Canal?

It is owned by the State Highway Agency.