US Bridges

County Road over Slough Creek

Fair

Dallas County, Iowa · 080271403 · Structure no. 000000000132000

Built
1927
98 years old
Condition
Fair
inspected November 2022
Type
Slab
Concrete
Length
23 ft
1 main span
Daily traffic
26
2022 count
Owner
County
County Highway Agency

About this bridge

County Road over Slough Creek is a concrete slab carrying County Road over Slough Creek in Dallas County, Iowa. It was built in 1927, so it is 98 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.

It carries about 26 vehicles a day, projected to reach 26 by 2043. The structure is 23 ft (7 m) long and 30 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesCounty Road
CrossesSlough Creek
Location080271403
RouteCounty Highway 0
CountyDallas County
StateIowa
Coordinates41.73919, -93.96081
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2022
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating56.3 US tons
Inventory rating34.4 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length23 ft (7 m)
Longest span20 ft (6.1 m)
Deck width30 ft (9.1 m)
Roadway width29 ft (8.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic26 (2022)
Projected traffic26 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was County Road over Slough Creek built?

It was built in 1927, making it 98 years old in 2025.

What condition is County Road over Slough Creek 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 November 2022.

How much traffic does County Road over Slough Creek carry?

About 26 vehicles per day (2022 count).

How long is County Road over Slough Creek?

The structure is 23 ft (7 m) long with a longest span of 20 ft (6.1 m) and a deck 30 ft wide.

Who owns County Road over Slough Creek?

It is owned by the County Highway Agency.