US Bridges

SW 400th ST over Old Mans Creek

Fair

Johnson County, Iowa · 079082301 · Structure no. 000000000204441

Built
1975
50 years old
Condition
Fair
inspected May 2023
Type
Slab
Concrete Continuous
Length
128 ft
3 main spans
Daily traffic
51
2021 count
Owner
County
County Highway Agency

About this bridge

SW 400th ST over Old Mans Creek is a concrete continuous slab carrying SW 400th ST over Old Mans Creek in Johnson County, Iowa. It was built in 1975, so it is 50 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.

It carries about 51 vehicles a day, projected to reach 51 by 2043. The structure is 128 ft (39 m) long and 27 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesSW 400th ST
CrossesOld Mans Creek
Location079082301
RouteCounty Highway 0
CountyJohnson County
StateIowa
Coordinates41.64372, -91.74649
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.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no 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 rating59.3 US tons
Inventory rating35.5 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length128 ft (39 m)
Longest span50 ft (15.2 m)
Deck width27 ft (8.1 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic51 (2021)
Projected traffic51 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SW 400th ST over Old Mans Creek built?

It was built in 1975, making it 50 years old in 2025.

What condition is SW 400th ST over Old Mans 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 May 2023.

How much traffic does SW 400th ST over Old Mans Creek carry?

About 51 vehicles per day (2021 count).

How long is SW 400th ST over Old Mans Creek?

The structure is 128 ft (39 m) long with a longest span of 50 ft (15.2 m) and a deck 27 ft wide.

Who owns SW 400th ST over Old Mans Creek?

It is owned by the County Highway Agency.