US Bridges

CO RD 105 over Small Natural Stream

Fair

Worth County, Iowa · 100213405 · Structure no. 000000000054120

Built
1949
76 years old
Condition
Fair
inspected November 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
40 ft
1 main span
Daily traffic
1,650
2022 count
Owner
County
County Highway Agency

About this bridge

CO RD 105 over Small Natural Stream is a steel stringer/multi-beam or girder carrying CO RD 105 over Small Natural Stream in Worth County, Iowa. It was built in 1949, so it is 76 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 1,650 vehicles a day, roughly 9% of them trucks, projected to reach 1,650 by 2043. The structure is 40 ft (12.2 m) long and 35 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

Open in Google Maps
CarriesCO RD 105
CrossesSmall Natural Stream
Location100213405
RouteCounty Highway 0
CountyWorth County
StateIowa
Coordinates43.44427, -93.30203
Functional classRural Major Collector

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55.7 US tons
Inventory rating33.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length40 ft (12.2 m)
Longest span37 ft (11.3 m)
Deck width35 ft (10.6 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,650 (2022)
Projected traffic1,650 by 2043
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 CO RD 105 over Small Natural Stream built?

It was built in 1949, making it 76 years old in 2025.

What condition is CO RD 105 over Small Natural Stream 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 2023.

How much traffic does CO RD 105 over Small Natural Stream carry?

About 1,650 vehicles per day (2022 count), of which roughly 9% are trucks.

How long is CO RD 105 over Small Natural Stream?

The structure is 40 ft (12.2 m) long with a longest span of 37 ft (11.3 m) and a deck 35 ft wide.

Who owns CO RD 105 over Small Natural Stream?

It is owned by the County Highway Agency.