US Bridges

Loc 450th ST over Union Slough Ditch

FairPosted for load

Kossuth County, Iowa · 099281101 · Structure no. 000000000216931

Built
1972
53 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
129 ft
3 main spans
Daily traffic
62
2021 count
Owner
County
County Highway Agency

About this bridge

Loc 450th ST over Union Slough Ditch is a steel continuous stringer/multi-beam or girder carrying Loc 450th ST over Union Slough Ditch in Kossuth County, Iowa. It was built in 1972, so it is 53 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. Its operating status is: posted for load restriction.

It carries about 62 vehicles a day, projected to reach 62 by 2043. The structure is 129 ft (39.2 m) long and 26 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesLoc 450th ST
CrossesUnion Slough Ditch
Location099281101
RouteCounty Highway 0
CountyKossuth County
StateIowa
Coordinates43.41448, -94.12627
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.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating36 US tons
Inventory rating21.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length129 ft (39.2 m)
Longest span49 ft (14.9 m)
Deck width26 ft (8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic62 (2021)
Projected traffic62 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Loc 450th ST over Union Slough Ditch built?

It was built in 1972, making it 53 years old in 2025.

What condition is Loc 450th ST over Union Slough Ditch 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 May 2023.

How much traffic does Loc 450th ST over Union Slough Ditch carry?

About 62 vehicles per day (2021 count).

How long is Loc 450th ST over Union Slough Ditch?

The structure is 129 ft (39.2 m) long with a longest span of 49 ft (14.9 m) and a deck 26 ft wide.

Who owns Loc 450th ST over Union Slough Ditch?

It is owned by the County Highway Agency.