Local over Muscatine Slough

Fair

Louisa County, Iowa · 075032405 · Structure no. 000000000224431

Built: 1981; 44 years old
Condition: Fair; inspected June 2023
Type: Slab; Concrete Continuous
Length: 103 ft; 3 main spans
Daily traffic: 41; 2022 count
Owner: County; County Highway Agency

About this bridge

Local over Muscatine Slough is a concrete continuous slab carrying Local over Muscatine Slough in Louisa 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 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 41 vehicles a day, projected to reach 41 by 2043. The structure is 103 ft (31.4 m) long and 33 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesLocal

CrossesMuscatine Slough

Location075032405

RouteCounty Highway 0

CountyLouisa County

StateIowa

Coordinates41.28352, -91.1451

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.

Component	Rating	Meaning
Deck	7 Good	Some minor problems.
Superstructure	7 Good	Some minor problems.
Substructure	6 Satisfactory	Structural elements show some minor deterioration.
Channel and channel protection	6 Satisfactory	Structural elements show some minor deterioration.

Last inspectionJune 2023

Inspection intervalevery 24 months

Operating statusOpen, no restriction

ScourFoundations stable; scour above top of footing

Structural evaluation6: Equal to present minimum criteria

Deck geometry7: Better than present minimum criteria

Waterway adequacy7: Better than present minimum criteria

Approach roadway alignment8: Equal to present desirable criteria

Operating rating54.7 US tons

Inventory rating34 US tons

Structure

Structure typeSlab

MaterialConcrete Continuous

DeckConcrete, cast-in-place

Main spans3

Design loadH 20

Structure length103 ft (31.4 m)

Longest span39 ft (11.9 m)

Deck width33 ft (10.1 m)

Roadway width30 ft (9.1 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic41 (2022)

Projected traffic41 by 2043

Trucks0%

Lanes on structure2

Traffic directionTwo-way traffic

CarriesHighway

CrossesWaterway

Detour if closed5 mi (8 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 proposedOther structural work, including hydraulic replacements

Estimated improvement cost—

NavigationNo navigation control on waterway

Frequently asked questions

When was Local over Muscatine Slough built?

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

What condition is Local over Muscatine Slough 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 June 2023.

How much traffic does Local over Muscatine Slough carry?

About 41 vehicles per day (2022 count).

How long is Local over Muscatine Slough?

The structure is 103 ft (31.4 m) long with a longest span of 39 ft (11.9 m) and a deck 33 ft wide.

Who owns Local over Muscatine Slough?

It is owned by the County Highway Agency.