US Bridges

28th ST over Floyd River

Fair

Woodbury County, Iowa · M31451500 · Structure no. 000000000010620

Built
1962
63 years old, rebuilt 1992
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
332 ft
4 main spans
Daily traffic
1,656
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

28th ST over Floyd River is a steel continuous stringer/multi-beam or girder carrying 28th ST over Floyd River in Woodbury County, Iowa. It was built in 1962 and reconstructed in 1992, so it is 63 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 5 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 1,656 vehicles a day, roughly 9% of them trucks, projected to reach 1,656 by 2043. The structure is 332 ft (101.2 m) long and 58 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
Carries28th ST
CrossesFloyd River
LocationM31451500
RouteCity Street 0
CountyWoodbury County
StateIowa
Coordinates42.51916, -96.37787
Functional classUrban 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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating51.4 US tons
Inventory rating30 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length332 ft (101.2 m)
Longest span92 ft (28 m)
Deck width58 ft (17.7 m)
Roadway width43 ft (13.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,656 (2021)
Projected traffic1,656 by 2043
Trucks9%
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

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 28th ST over Floyd River built?

It was built in 1962, making it 63 years old in 2025. It was reconstructed in 1992.

What condition is 28th ST over Floyd 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 April 2023.

How much traffic does 28th ST over Floyd River carry?

About 1,656 vehicles per day (2021 count), of which roughly 9% are trucks.

How long is 28th ST over Floyd River?

The structure is 332 ft (101.2 m) long with a longest span of 92 ft (28 m) and a deck 58 ft wide.

Who owns 28th ST over Floyd River?

It is owned by the City or Municipal Highway Agency.