US Bridges

US 93 over Little Wood River

Fair

Lincoln County, Idaho · 4.3 S. Richfield · Structure no. 000000000013155

Built
1987
38 years old
Condition
Fair
inspected May 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
54 ft
1 main span
Daily traffic
2,300
2023 count
Owner
State
State Highway Agency

About this bridge

US 93 over Little Wood River is a prestressed concrete box beam or girders - multiple carrying US 93 over Little Wood River in Lincoln County, Idaho. It was built in 1987, so it is 38 years old, younger 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 2,300 vehicles a day, roughly 21% of them trucks, projected to reach 3,450 by 2042. The structure is 54 ft (16.5 m) long and 40 ft wide. If it were closed, the detour would be 47.8 mi (77 km).

Location

Open in Google Maps
CarriesUS 93
CrossesLittle Wood River
Location4.3 S. Richfield
RouteU.S. Route 93
CountyLincoln County
StateIdaho
Coordinates43.01531, -114.22792
Functional classRural Principal Arterial - Other

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 inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
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 rating59 US tons
Inventory rating19 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length54 ft (16.5 m)
Longest span53 ft (16.2 m)
Deck width40 ft (12.2 m)
Roadway width37 ft (11.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,300 (2023)
Projected traffic3,450 by 2042
Trucks21%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed47.8 mi (77 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$839,000 (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 93 over Little Wood River built?

It was built in 1987, making it 38 years old in 2025.

What condition is US 93 over Little Wood River 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 May 2023.

How much traffic does US 93 over Little Wood River carry?

About 2,300 vehicles per day (2023 count), of which roughly 21% are trucks.

How long is US 93 over Little Wood River?

The structure is 54 ft (16.5 m) long with a longest span of 53 ft (16.2 m) and a deck 40 ft wide.

Who owns US 93 over Little Wood River?

It is owned by the State Highway Agency.