US Bridges

SW Observty Ave over Old Mans Creek

Fair

Johnson County, Iowa · 078062105 · Structure no. 000000000203255

Built
1980
45 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
229 ft
3 main spans
Daily traffic
290
2021 count
Owner
County
County Highway Agency

About this bridge

SW Observty Ave over Old Mans Creek is a prestressed concrete stringer/multi-beam or girder carrying SW Observty Ave over Old Mans Creek in Johnson County, Iowa. It was built in 1980, so it is 45 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 290 vehicles a day, roughly 6% of them trucks, projected to reach 290 by 2043. The structure is 229 ft (69.8 m) long and 33 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesSW Observty Ave
CrossesOld Mans Creek
Location078062105
RouteCounty Highway 0
StateIowa
Coordinates41.55469, -91.55134
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 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 alignment6: Equal to present minimum criteria
Operating rating71.1 US tons
Inventory rating27.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length229 ft (69.8 m)
Longest span82 ft (25 m)
Deck width33 ft (10.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic290 (2021)
Projected traffic290 by 2043
Trucks6%
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SW Observty Ave over Old Mans Creek built?

It was built in 1980, making it 45 years old in 2025.

What condition is SW Observty Ave 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 April 2023.

How much traffic does SW Observty Ave over Old Mans Creek carry?

About 290 vehicles per day (2021 count), of which roughly 6% are trucks.

How long is SW Observty Ave over Old Mans Creek?

The structure is 229 ft (69.8 m) long with a longest span of 82 ft (25 m) and a deck 33 ft wide.

Who owns SW Observty Ave over Old Mans Creek?

It is owned by the County Highway Agency.