US Bridges

260th ST over Willow Creek

Fair

Harrison County, Iowa · 079433007 · Structure no. 000000000178190

Built
1966
59 years old
Condition
Fair
inspected December 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
230 ft
3 main spans
Daily traffic
417
2022 count
Owner
County
County Highway Agency

About this bridge

260th ST over Willow Creek is a steel continuous stringer/multi-beam or girder carrying 260th ST over Willow Creek in Harrison County, Iowa. It was built in 1966, so it is 59 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.

It carries about 417 vehicles a day, roughly 14% of them trucks, projected to reach 417 by 2044. The structure is 230 ft (70.1 m) long and 30 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
Carries260th ST
CrossesWillow Creek
Location079433007
RouteCounty Highway 0
CountyHarrison County
StateIowa
Coordinates41.63194, -95.89115
Functional classRural Major 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65.5 US tons
Inventory rating30.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length230 ft (70.1 m)
Longest span88 ft (26.8 m)
Deck width30 ft (9.2 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic417 (2022)
Projected traffic417 by 2044
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 260th ST over Willow Creek built?

It was built in 1966, making it 59 years old in 2025.

What condition is 260th ST over Willow 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 December 2024.

How much traffic does 260th ST over Willow Creek carry?

About 417 vehicles per day (2022 count), of which roughly 14% are trucks.

How long is 260th ST over Willow Creek?

The structure is 230 ft (70.1 m) long with a longest span of 88 ft (26.8 m) and a deck 30 ft wide.

Who owns 260th ST over Willow Creek?

It is owned by the County Highway Agency.