US Bridges

D51 (260th St) over I 29

Fair

Woodbury County, Iowa · At Jct. I-29 · Structure no. 000000000053661

Built
2014
11 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
359 ft
4 main spans
Daily traffic
1,699
2022 count
Owner
State
State Highway Agency

About this bridge

D51 (260th St) over I 29 is a prestressed concrete stringer/multi-beam or girder carrying D51 (260th St) over I 29 in Woodbury County, Iowa. It was built in 2014, so it is 11 years old, younger 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 1,699 vehicles a day, roughly 23% of them trucks, projected to reach 1,699 by 2044. The structure is 359 ft (109.3 m) long and 59 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesD51 (260th St)
CrossesI 29
LocationAt Jct. I-29
RouteCounty Highway 0
CountyWoodbury County
StateIowa
Coordinates42.32994, -96.31927
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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHL 93
Structure length359 ft (109.3 m)
Longest span112 ft (34 m)
Deck width59 ft (18 m)
Roadway width56 ft (17.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,699 (2022)
Projected traffic1,699 by 2044
Trucks23%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was D51 (260th St) over I 29 built?

It was built in 2014, making it 11 years old in 2025.

What condition is D51 (260th St) over I 29 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 November 2024.

How much traffic does D51 (260th St) over I 29 carry?

About 1,699 vehicles per day (2022 count), of which roughly 23% are trucks.

How long is D51 (260th St) over I 29?

The structure is 359 ft (109.3 m) long with a longest span of 112 ft (34 m) and a deck 59 ft wide.

Who owns D51 (260th St) over I 29?

It is owned by the State Highway Agency.