US Bridges

Local over Iowa Slough

FairPosted for load

Louisa County, Iowa · 073013206 · Structure no. 000000000223520

Built
1978
47 years old, rebuilt 2011
Condition
Fair
inspected June 2023
Type
Channel Beam
Concrete
Length
31 ft
1 main span
Daily traffic
40
2022 count
Owner
County
County Highway Agency

About this bridge

Local over Iowa Slough is a concrete channel beam carrying Local over Iowa Slough in Louisa County, Iowa. It was built in 1978 and reconstructed in 2011, so it is 47 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 40 vehicles a day, projected to reach 40 by 2043. The structure is 31 ft (9.4 m) long and 29 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesLocal
CrossesIowa Slough
Location073013206
RouteCounty Highway 0
CountyLouisa County
StateIowa
Coordinates41.07292, -90.99671
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 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 adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating38.3 US tons
Inventory rating22.3 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length31 ft (9.4 m)
Longest span31 ft (9.4 m)
Deck width29 ft (8.8 m)
Roadway width27 ft (8.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40 (2022)
Projected traffic40 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Local over Iowa Slough built?

It was built in 1978, making it 47 years old in 2025. It was reconstructed in 2011.

What condition is Local over Iowa 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 Iowa Slough carry?

About 40 vehicles per day (2022 count).

How long is Local over Iowa Slough?

The structure is 31 ft (9.4 m) long with a longest span of 31 ft (9.4 m) and a deck 29 ft wide.

Who owns Local over Iowa Slough?

It is owned by the County Highway Agency.