US Bridges

Local over Lone Willow

FairPosted for load

Audubon County, Iowa · 080361402 · Structure no. 000000000068831

Built
1976
49 years old, rebuilt 2012
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
80 ft
3 main spans
Daily traffic
30
2022 count
Owner
County
County Highway Agency

About this bridge

Local over Lone Willow is a wood or timber stringer/multi-beam or girder carrying Local over Lone Willow in Audubon County, Iowa. It was built in 1976 and reconstructed in 2012, so it is 49 years old, older than the Iowa average of 45.5 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 other load-capacity restriction.

It carries about 30 vehicles a day, roughly 10% of them trucks, projected to reach 30 by 2043. The structure is 80 ft (24.4 m) long and 20 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesLocal
CrossesLone Willow
Location080361402
RouteCounty Highway 0
CountyAudubon County
StateIowa
Coordinates41.74469, -95.01505
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
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 inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusPosted for other load-capacity restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating36.3 US tons
Inventory rating25.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadUnknown
Structure length80 ft (24.4 m)
Longest span32 ft (9.8 m)
Deck width20 ft (6.2 m)
Roadway width20 ft (6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30 (2022)
Projected traffic30 by 2043
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 statusNot eligible for the National Register of Historic Places
Work proposedDeck replacement with only incidental widening
Estimated improvement cost$52 million (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Local over Lone Willow built?

It was built in 1976, making it 49 years old in 2025. It was reconstructed in 2012.

What condition is Local over Lone Willow 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 September 2023.

How much traffic does Local over Lone Willow carry?

About 30 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is Local over Lone Willow?

The structure is 80 ft (24.4 m) long with a longest span of 32 ft (9.8 m) and a deck 20 ft wide.

Who owns Local over Lone Willow?

It is owned by the County Highway Agency.