US Bridges

235th Trail over Willow Creek

Good

Harrison County, Iowa · 079431003 · Structure no. 000000000178131

Built
2006
19 years old
Condition
Good
inspected November 2022
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
191 ft
3 main spans
Daily traffic
29
2022 count
Owner
County
County Highway Agency

About this bridge

235th Trail over Willow Creek is a prestressed concrete stringer/multi-beam or girder carrying 235th Trail over Willow Creek in Harrison County, Iowa. It was built in 2006, so it is 19 years old, younger than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 29 vehicles a day, projected to reach 29 by 2043. The structure is 191 ft (58.2 m) long and 27 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
Carries235th Trail
CrossesWillow Creek
Location079431003
RouteCounty Highway 0
CountyHarrison County
StateIowa
Coordinates41.66804, -95.83838
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating82.8 US tons
Inventory rating40.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length191 ft (58.2 m)
Longest span68 ft (20.7 m)
Deck width27 ft (8.3 m)
Roadway width25 ft (7.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic29 (2022)
Projected traffic29 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 235th Trail over Willow Creek built?

It was built in 2006, making it 19 years old in 2025.

What condition is 235th Trail over Willow Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in November 2022.

How much traffic does 235th Trail over Willow Creek carry?

About 29 vehicles per day (2022 count).

How long is 235th Trail over Willow Creek?

The structure is 191 ft (58.2 m) long with a longest span of 68 ft (20.7 m) and a deck 27 ft wide.

Who owns 235th Trail over Willow Creek?

It is owned by the County Highway Agency.