US Bridges

Old Ia 105 over Turtle Creek

Fair

Mitchell County, Iowa · 099182306 · Structure no. 000000000036590

Built
1930
95 years old, rebuilt 1958
Condition
Fair
inspected December 2023
Type
Girder and Floorbeam System
Steel
Length
63 ft
1 main span
Daily traffic
746
2022 count
Owner
County
County Highway Agency

About this bridge

Old Ia 105 over Turtle Creek is a steel girder and floorbeam system carrying Old Ia 105 over Turtle Creek in Mitchell County, Iowa. It was built in 1930 and reconstructed in 1958, so it is 95 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 746 vehicles a day, roughly 13% of them trucks, projected to reach 746 by 2043. The structure is 63 ft (19.2 m) long and 34 ft wide. If it were closed, the detour would be 13 mi (21 km).

Location

Open in Google Maps
CarriesOld Ia 105
CrossesTurtle Creek
Location099182306
RouteCounty Highway 0
CountyMitchell County
StateIowa
Coordinates43.38376, -92.93039
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.
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 protection8 Very GoodNo problems noted.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating39.2 US tons
Inventory rating23.5 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length63 ft (19.2 m)
Longest span60 ft (18.3 m)
Deck width34 ft (10.4 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic746 (2022)
Projected traffic746 by 2043
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13 mi (21 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 Old Ia 105 over Turtle Creek built?

It was built in 1930, making it 95 years old in 2025. It was reconstructed in 1958.

What condition is Old Ia 105 over Turtle 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 December 2023.

How much traffic does Old Ia 105 over Turtle Creek carry?

About 746 vehicles per day (2022 count), of which roughly 13% are trucks.

How long is Old Ia 105 over Turtle Creek?

The structure is 63 ft (19.2 m) long with a longest span of 60 ft (18.3 m) and a deck 34 ft wide.

Who owns Old Ia 105 over Turtle Creek?

It is owned by the County Highway Agency.