US Bridges

SW 360th ST over N Br Old Mans CR

FairPosted for load

Johnson County, Iowa · 079080801 · Structure no. 000000000204320

Built
1915
110 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
21 ft
1 main span
Daily traffic
35
2021 count
Owner
County
County Highway Agency

About this bridge

SW 360th ST over N Br Old Mans CR is a steel stringer/multi-beam or girder carrying SW 360th ST over N Br Old Mans CR in Johnson County, Iowa. It was built in 1915, so it is 110 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 35 vehicles a day, projected to reach 35 by 2043. The structure is 21 ft (6.4 m) long and 16 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesSW 360th ST
CrossesN Br Old Mans CR
Location079080801
RouteCounty Highway 0
CountyJohnson County
StateIowa
Coordinates41.67296, -91.80847
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry8: Equal to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating14.6 US tons
Inventory rating9.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length21 ft (6.4 m)
Longest span21 ft (6.4 m)
Deck width16 ft (4.9 m)
Roadway width16 ft (4.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic35 (2021)
Projected traffic35 by 2043
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-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 statusPossibly eligible for the National Register; requires further investigation
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 360th ST over N Br Old Mans CR built?

It was built in 1915, making it 110 years old in 2025.

What condition is SW 360th ST over N Br Old Mans CR 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 360th ST over N Br Old Mans CR carry?

About 35 vehicles per day (2021 count).

How long is SW 360th ST over N Br Old Mans CR?

The structure is 21 ft (6.4 m) long with a longest span of 21 ft (6.4 m) and a deck 16 ft wide.

Who owns SW 360th ST over N Br Old Mans CR?

It is owned by the County Highway Agency.