US Bridges

20th St. over White Oak Creek

Fair

Jones County, Iowa · 083043501 · Structure no. 000000000206961

Built
1985
40 years old
Condition
Fair
inspected January 2023
Type
Tee Beam
Prestressed Concrete
Length
36 ft
1 main span
Daily traffic
11
2022 count
Owner
County
County Highway Agency

About this bridge

20th St. over White Oak Creek is a prestressed concrete tee beam carrying 20th St. over White Oak Creek in Jones County, Iowa. It was built in 1985, so it is 40 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 11 vehicles a day, projected to reach 11 by 2043. The structure is 36 ft (11 m) long and 24 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
Carries20th St.
CrossesWhite Oak Creek
Location083043501
RouteCounty Highway 0
CountyJones County
StateIowa
Coordinates41.96229, -91.2872
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating35.1 US tons
Inventory rating26.8 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length36 ft (11 m)
Longest span35 ft (10.7 m)
Deck width24 ft (7.4 m)
Roadway width22 ft (6.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11 (2022)
Projected traffic11 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 20th St. over White Oak Creek built?

It was built in 1985, making it 40 years old in 2025.

What condition is 20th St. over White Oak 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 January 2023.

How much traffic does 20th St. over White Oak Creek carry?

About 11 vehicles per day (2022 count).

How long is 20th St. over White Oak Creek?

The structure is 36 ft (11 m) long with a longest span of 35 ft (10.7 m) and a deck 24 ft wide.

Who owns 20th St. over White Oak Creek?

It is owned by the County Highway Agency.