US Bridges

Little Rock Road over Noble Canal

Fair

Gem County, Idaho · 0.5 N. 2.2 W. Letha · Structure no. 000000000028075

Built
1960
65 years old, rebuilt 1989
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
27 ft
1 main span
Daily traffic
50
2023 count
Owner
County
County Highway Agency

About this bridge

Little Rock Road over Noble Canal is a steel stringer/multi-beam or girder carrying Little Rock Road over Noble Canal in Gem County, Idaho. It was built in 1960 and reconstructed in 1989, so it is 65 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 50 vehicles a day, roughly 10% of them trucks, projected to reach 75 by 2039. The structure is 27 ft (8.2 m) long and 20 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesLittle Rock Road
CrossesNoble Canal
Location0.5 N. 2.2 W. Letha
RouteCounty Highway 0
CountyGem County
StateIdaho
Coordinates43.90197, -116.69231
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating96 US tons
Inventory rating57 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadH 15
Structure length27 ft (8.2 m)
Longest span23 ft (7 m)
Deck width20 ft (6.1 m)
Roadway width20 ft (6.1 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 Little Rock Road over Noble Canal built?

It was built in 1960, making it 65 years old in 2025. It was reconstructed in 1989.

What condition is Little Rock 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 Little Rock Road over Noble Canal carry?

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

How long is Little Rock Road over Noble Canal?

The structure is 27 ft (8.2 m) long with a longest span of 23 ft (7 m) and a deck 20 ft wide.

Who owns Little Rock Road over Noble Canal?

It is owned by the County Highway Agency.