US Bridges

Loc 470th ST over Middle Branch Blue Earth

FairPosted for load

Kossuth County, Iowa · 100273101 · Structure no. 000000000217441

Built
1976
49 years old
Condition
Fair
inspected May 2023
Type
Slab
Concrete Continuous
Length
102 ft
3 main spans
Daily traffic
30
2021 count
Owner
County
County Highway Agency

About this bridge

Loc 470th ST over Middle Branch Blue Earth is a concrete continuous slab carrying Loc 470th ST over Middle Branch Blue Earth in Kossuth County, Iowa. It was built in 1976, so it is 49 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 6 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 30 vehicles a day, projected to reach 30 by 2043. The structure is 102 ft (31 m) long and 26 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesLoc 470th ST
CrossesMiddle Branch Blue Earth
Location100273101
RouteCounty Highway 0
StateIowa
Coordinates43.44433, -94.07028
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
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 traffic30 (2021)
Projected traffic30 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 470th ST over Middle Branch Blue Earth built?

It was built in 1976, making it 49 years old in 2025.

What condition is Loc 470th ST over Middle Branch Blue Earth 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 470th ST over Middle Branch Blue Earth carry?

About 30 vehicles per day (2021 count).

How long is Loc 470th ST over Middle Branch Blue Earth?

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 Middle Branch Blue Earth?

It is owned by the County Highway Agency.