US Bridges

Loc 470th ST over Union Slough Ditch

GoodPosted for load

Kossuth County, Iowa · 100283501 · Structure no. 000000000217561

Built
1981
44 years old
Condition
Good
inspected May 2023
Type
Slab
Concrete Continuous
Length
102 ft
3 main spans
Daily traffic
21
2021 count
Owner
County
County Highway Agency

About this bridge

Loc 470th ST over Union Slough Ditch is a concrete continuous slab carrying Loc 470th ST over Union Slough Ditch in Kossuth County, Iowa. It was built in 1981, so it is 44 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. Its operating status is: posted for load restriction.

It carries about 21 vehicles a day, projected to reach 21 by 2043. The structure is 102 ft (31 m) long and 26 ft wide.

Location

Open in Google Maps
CarriesLoc 470th ST
CrossesUnion Slough Ditch
Location100283501
RouteCounty Highway 0
CountyKossuth County
StateIowa
Coordinates43.44468, -94.12379
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
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 evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating39 US tons
Inventory rating23.4 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length102 ft (31 m)
Longest span39 ft (11.9 m)
Deck width26 ft (8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic21 (2021)
Projected traffic21 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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 470th ST over Union Slough Ditch built?

It was built in 1981, making it 44 years old in 2025.

What condition is Loc 470th ST over Union Slough Ditch 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 May 2023.

How much traffic does Loc 470th ST over Union Slough Ditch carry?

About 21 vehicles per day (2021 count).

How long is Loc 470th ST over Union Slough Ditch?

The structure is 102 ft (31 m) long with a longest span of 39 ft (11.9 m) and a deck 26 ft wide.

Who owns Loc 470th ST over Union Slough Ditch?

It is owned by the County Highway Agency.