US Bridges

Macon Flat Road over Camas Creek

FairPosted for load

Camas County, Idaho · 0.3 S. 9.5 E. Fairfield · Structure no. 000000000023825

Built
1945
80 years old
Condition
Fair
inspected October 2024
Type
Truss - Thru
Steel
Length
82 ft
1 main span
Daily traffic
20
2023 count
Owner
County
County Highway Agency

About this bridge

Macon Flat Road over Camas Creek is a steel truss - thru carrying Macon Flat Road over Camas Creek in Camas County, Idaho. It was built in 1945, so it is 80 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. Its operating status is: posted for load restriction.

It carries about 20 vehicles a day, projected to reach 30 by 2042. The structure is 82 ft (25 m) long and 17 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesMacon Flat Road
CrossesCamas Creek
Location0.3 S. 9.5 E. Fairfield
RouteCounty Highway 0
CountyCamas County
StateIdaho
Coordinates43.33721, -114.59932
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry8: Equal to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating30 US tons
Inventory rating18 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckCorrugated steel
Main spans1 (+1 approach)
Design loadH 10
Structure length82 ft (25 m)
Longest span60 ft (18.3 m)
Deck width17 ft (5.3 m)
Roadway width16 ft (4.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (2023)
Projected traffic30 by 2042
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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$742,000 (2017 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Macon Flat Road over Camas Creek built?

It was built in 1945, making it 80 years old in 2025.

What condition is Macon Flat Road over Camas Creek 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 October 2024.

How much traffic does Macon Flat Road over Camas Creek carry?

About 20 vehicles per day (2023 count).

How long is Macon Flat Road over Camas Creek?

The structure is 82 ft (25 m) long with a longest span of 60 ft (18.3 m) and a deck 17 ft wide.

Who owns Macon Flat Road over Camas Creek?

It is owned by the County Highway Agency.